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» Revision
237.2.155
(compared to revision 237.11.2)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-10-22 00:05:01 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-20091022000501-g792e99q5g1wkyet
Merge from release branch.
- 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
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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@recompile.se>.
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() */
42
stdin, feof(), perror(), fputc(),
43
getopt_long */
46
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
48
46
*/
49
#include <error.h> /* error() */
50
47
#include <iso646.h> /* or, not */
51
48
#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
*/
49
#include <string.h> /* strlen, rindex, strncmp, strcmp */
56
50
#include <argp.h> /* struct argp_option, struct
57
51
argp_state, struct argp,
58
52
argp_parse(), error_t,
60
54
ARGP_ERR_UNKNOWN */
61
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
62
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
63
#include <fcntl.h> /* open() */
64
#include <stdarg.h> /* va_list, va_start(), ... */
65
57
66
58
volatile sig_atomic_t quit_now = 0;
67
59
int signal_received;
68
60
bool debug = false;
69
61
const char *argp_program_version = "password-prompt " VERSION;
70
const char *argp_program_bug_address = "<mandos@recompile.se>";
71
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
}
62
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
63
98
64
static void termination_handler(int signum){
99
65
if(quit_now){
103
69
signal_received = signum;
104
70
}
105
71
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
72
int main(int argc, char **argv){
223
ssize_t sret;
224
int ret;
73
ssize_t ret;
225
74
size_t n;
226
75
struct termios t_new, t_old;
227
76
char *buffer = NULL;
237
86
.doc = "Prefix shown before the prompt", .group = 2 },
238
87
{ .name = "debug", .key = 128,
239
88
.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
89
{ .name = NULL }
250
90
};
251
91
252
92
error_t parse_opt (int key, char *arg, struct argp_state *state){
253
errno = 0;
254
93
switch (key){
255
94
case 'p':
256
95
prefix = arg;
258
97
case 128:
259
98
debug = true;
260
99
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);
100
case ARGP_KEY_ARG:
101
argp_usage(state);
102
break;
103
case ARGP_KEY_END:
274
104
break;
275
105
default:
276
106
return ARGP_ERR_UNKNOWN;
277
107
}
278
return errno;
108
return 0;
279
109
}
280
110
281
111
struct argp argp = { .options = options, .parser = parse_opt,
282
112
.args_doc = "",
283
113
.doc = "Mandos password-prompt -- Read and"
284
114
" 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;
115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
116
if(ret == ARGP_ERR_UNKNOWN){
117
fprintf(stderr, "Unknown error while parsing arguments\n");
118
return EX_SOFTWARE;
297
119
}
298
120
}
299
121
300
122
if(debug){
301
123
fprintf(stderr, "Starting %s\n", argv[0]);
302
124
}
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
125
if(debug){
312
126
fprintf(stderr, "Storing current terminal attributes\n");
313
127
}
314
128
315
129
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
316
130
int e = errno;
317
error(0, errno, "tcgetattr");
131
perror("tcgetattr");
318
132
switch(e){
319
133
case EBADF:
320
134
case ENOTTY:
327
141
sigemptyset(&new_action.sa_mask);
328
142
ret = sigaddset(&new_action.sa_mask, SIGINT);
329
143
if(ret == -1){
330
error(0, errno, "sigaddset");
144
perror("sigaddset");
331
145
return EX_OSERR;
332
146
}
333
147
ret = sigaddset(&new_action.sa_mask, SIGHUP);
334
148
if(ret == -1){
335
error(0, errno, "sigaddset");
149
perror("sigaddset");
336
150
return EX_OSERR;
337
151
}
338
152
ret = sigaddset(&new_action.sa_mask, SIGTERM);
339
153
if(ret == -1){
340
error(0, errno, "sigaddset");
154
perror("sigaddset");
341
155
return EX_OSERR;
342
156
}
343
157
/* Need to check if the handler is SIG_IGN before handling:
346
160
*/
347
161
ret = sigaction(SIGINT, NULL, &old_action);
348
162
if(ret == -1){
349
error(0, errno, "sigaction");
163
perror("sigaction");
350
164
return EX_OSERR;
351
165
}
352
166
if(old_action.sa_handler != SIG_IGN){
353
167
ret = sigaction(SIGINT, &new_action, NULL);
354
168
if(ret == -1){
355
error(0, errno, "sigaction");
169
perror("sigaction");
356
170
return EX_OSERR;
357
171
}
358
172
}
359
173
ret = sigaction(SIGHUP, NULL, &old_action);
360
174
if(ret == -1){
361
error(0, errno, "sigaction");
175
perror("sigaction");
362
176
return EX_OSERR;
363
177
}
364
178
if(old_action.sa_handler != SIG_IGN){
365
179
ret = sigaction(SIGHUP, &new_action, NULL);
366
180
if(ret == -1){
367
error(0, errno, "sigaction");
181
perror("sigaction");
368
182
return EX_OSERR;
369
183
}
370
184
}
371
185
ret = sigaction(SIGTERM, NULL, &old_action);
372
186
if(ret == -1){
373
error(0, errno, "sigaction");
187
perror("sigaction");
374
188
return EX_OSERR;
375
189
}
376
190
if(old_action.sa_handler != SIG_IGN){
377
191
ret = sigaction(SIGTERM, &new_action, NULL);
378
192
if(ret == -1){
379
error(0, errno, "sigaction");
193
perror("sigaction");
380
194
return EX_OSERR;
381
195
}
382
196
}
390
204
t_new.c_lflag &= ~(tcflag_t)ECHO;
391
205
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
392
206
int e = errno;
393
error(0, errno, "tcsetattr-echo");
207
perror("tcsetattr-echo");
394
208
switch(e){
395
209
case EBADF:
396
210
case ENOTTY:
417
231
fprintf(stderr, "%s ", prefix);
418
232
}
419
233
{
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";
234
const char *cryptsource = getenv("cryptsource");
235
const char *crypttarget = getenv("crypttarget");
236
const char *const prompt
237
= "Enter passphrase to unlock the disk";
431
238
if(cryptsource == NULL){
432
239
if(crypttarget == NULL){
433
fprintf(stderr, "%s to unlock the disk: ", prompt2);
240
fprintf(stderr, "%s: ", prompt);
434
241
} else {
435
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
436
prompt2);
242
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
437
243
}
438
244
} else {
439
245
if(crypttarget == NULL){
440
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
441
prompt2);
246
fprintf(stderr, "%s %s: ", prompt, cryptsource);
442
247
} else {
443
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
444
crypttarget, prompt2);
248
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
249
crypttarget);
445
250
}
446
251
}
447
252
}
448
sret = getline(&buffer, &n, stdin);
449
if(sret > 0){
253
ret = getline(&buffer, &n, stdin);
254
if(ret > 0){
450
255
status = EXIT_SUCCESS;
451
256
/* Make n = data size instead of allocated buffer size */
452
n = (size_t)sret;
257
n = (size_t)ret;
453
258
/* Strip final newline */
454
259
if(n > 0 and buffer[n-1] == '\n'){
455
260
buffer[n-1] = '\0'; /* not strictly necessary */
457
262
}
458
263
size_t written = 0;
459
264
while(written < n){
460
sret = write(STDOUT_FILENO, buffer + written, n - written);
461
if(sret < 0){
265
ret = write(STDOUT_FILENO, buffer + written, n - written);
266
if(ret < 0){
462
267
int e = errno;
463
error(0, errno, "write");
268
perror("write");
464
269
switch(e){
465
270
case EBADF:
466
271
case EFAULT:
477
282
}
478
283
break;
479
284
}
480
written += (size_t)sret;
285
written += (size_t)ret;
481
286
}
482
sret = close(STDOUT_FILENO);
483
if(sret == -1){
287
ret = close(STDOUT_FILENO);
288
if(ret == -1){
484
289
int e = errno;
485
error(0, errno, "close");
290
perror("close");
486
291
switch(e){
487
292
case EBADF:
488
293
status = EX_OSFILE;
495
300
}
496
301
break;
497
302
}
498
if(sret < 0){
303
if(ret < 0){
499
304
int e = errno;
500
305
if(errno != EINTR and not feof(stdin)){
501
error(0, errno, "getline");
306
perror("getline");
502
307
switch(e){
503
308
case EBADF:
504
309
status = EX_UNAVAILABLE;
511
316
break;
512
317
}
513
318
}
514
/* if(sret == 0), then the only sensible thing to do is to retry
515
to read from stdin */
319
/* if(ret == 0), then the only sensible thing to do is to retry to
320
read from stdin */
516
321
fputc('\n', stderr);
517
322
if(debug and not quit_now){
518
323
/* If quit_now is nonzero, we were interrupted by a signal, and
527
332
fprintf(stderr, "Restoring terminal attributes\n");
528
333
}
529
334
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
530
error(0, errno, "tcsetattr+echo");
335
perror("tcsetattr+echo");
531
336
}
532
337
533
338
if(quit_now){
535
340
old_action.sa_handler = SIG_DFL;
536
341
ret = sigaction(signal_received, &old_action, NULL);
537
342
if(ret == -1){
538
error(0, errno, "sigaction");
343
perror("sigaction");
539
344
}
540
345
raise(signal_received);
541
346
}
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