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237.2.34
(compared to revision 237.7.454)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-15 05:27:55 UTC
- mfrom: (246 mandos-release)
- mto: (24.1.123 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 249.
- Revision ID: teddy@fukt.bsnet.se-20090115052755-luw0gjx8727p24o3
Merge from release branch.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 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@recompile.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(), 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
volatile sig_atomic_t quit_now = 0;
67
int signal_received;
54
volatile bool quit_now = false;
68
55
bool debug = false;
69
56
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
__attribute__((format (gnu_printf, 3, 4)))
77
void error_plus(int status, int errnum, const char *formatstring,
78
...){
79
va_list ap;
80
char *text;
81
int ret;
82
83
va_start(ap, formatstring);
84
ret = vasprintf(&text, formatstring, ap);
85
if(ret == -1){
86
fprintf(stderr, "Mandos plugin %s: ",
87
program_invocation_short_name);
88
vfprintf(stderr, formatstring, ap);
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
static void termination_handler(int signum){
99
if(quit_now){
100
return;
101
}
102
quit_now = 1;
103
signal_received = signum;
104
}
105
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
__attribute__((nonnull))
113
int is_plymouth(const struct dirent *proc_entry){
114
int ret;
115
int cl_fd;
116
{
117
uintmax_t proc_id;
118
char *tmp;
119
errno = 0;
120
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
121
122
if(errno != 0 or *tmp != '\0'
123
or proc_id != (uintmax_t)((pid_t)proc_id)){
124
return 0;
125
}
126
}
127
128
char *cmdline_filename;
129
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
130
proc_entry->d_name);
131
if(ret == -1){
132
error_plus(0, errno, "asprintf");
133
return 0;
134
}
135
136
/* Open /proc/<pid>/cmdline */
137
cl_fd = open(cmdline_filename, O_RDONLY);
138
free(cmdline_filename);
139
if(cl_fd == -1){
140
if(errno != ENOENT){
141
error_plus(0, errno, "open");
142
}
143
return 0;
144
}
145
146
char *cmdline = NULL;
147
{
148
size_t cmdline_len = 0;
149
size_t cmdline_allocated = 0;
150
char *tmp;
151
const size_t blocksize = 1024;
152
ssize_t sret;
153
do {
154
/* Allocate more space? */
155
if(cmdline_len + blocksize + 1 > cmdline_allocated){
156
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
157
if(tmp == NULL){
158
error_plus(0, errno, "realloc");
159
free(cmdline);
160
close(cl_fd);
161
return 0;
162
}
163
cmdline = tmp;
164
cmdline_allocated += blocksize;
165
}
166
167
/* Read data */
168
sret = read(cl_fd, cmdline + cmdline_len,
169
cmdline_allocated - cmdline_len);
170
if(sret == -1){
171
error_plus(0, errno, "read");
172
free(cmdline);
173
close(cl_fd);
174
return 0;
175
}
176
cmdline_len += (size_t)sret;
177
} while(sret != 0);
178
ret = close(cl_fd);
179
if(ret == -1){
180
error_plus(0, errno, "close");
181
free(cmdline);
182
return 0;
183
}
184
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
185
}
186
/* we now have cmdline */
187
188
/* get basename */
189
char *cmdline_base = strrchr(cmdline, '/');
190
if(cmdline_base != NULL){
191
cmdline_base += 1; /* skip the slash */
192
} else {
193
cmdline_base = cmdline;
194
}
195
196
if(strcmp(cmdline_base, plymouth_name) != 0){
197
if(debug){
198
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
199
plymouth_name);
200
}
201
free(cmdline);
202
return 0;
203
}
204
if(debug){
205
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
206
plymouth_name);
207
}
208
free(cmdline);
209
return 1;
210
}
211
212
struct dirent **direntries = NULL;
213
int ret;
214
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
215
if(ret == -1){
216
error_plus(1, errno, "scandir");
217
}
218
{
219
int i = ret;
220
while(i--){
221
free(direntries[i]);
222
}
223
}
224
free(direntries);
225
return ret > 0;
226
}
227
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
59
static void termination_handler(__attribute__((unused))int signum){
60
quit_now = true;
61
}
228
62
229
63
int main(int argc, char **argv){
230
ssize_t sret;
231
int ret;
64
ssize_t ret;
232
65
size_t n;
233
66
struct termios t_new, t_old;
234
67
char *buffer = NULL;
244
77
.doc = "Prefix shown before the prompt", .group = 2 },
245
78
{ .name = "debug", .key = 128,
246
79
.doc = "Debug mode", .group = 3 },
247
/*
248
* These reproduce what we would get without ARGP_NO_HELP
249
*/
250
{ .name = "help", .key = '?',
251
.doc = "Give this help list", .group = -1 },
252
{ .name = "usage", .key = -3,
253
.doc = "Give a short usage message", .group = -1 },
254
{ .name = "version", .key = 'V',
255
.doc = "Print program version", .group = -1 },
256
80
{ .name = NULL }
257
81
};
258
82
259
__attribute__((nonnull(3)))
260
error_t parse_opt (int key, char *arg, struct argp_state *state){
261
errno = 0;
262
switch (key){
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
switch (key) {
263
85
case 'p':
264
86
prefix = arg;
265
87
break;
266
88
case 128:
267
89
debug = true;
268
90
break;
269
/*
270
* These reproduce what we would get without ARGP_NO_HELP
271
*/
272
case '?': /* --help */
273
argp_state_help(state, state->out_stream,
274
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
275
& ~(unsigned int)ARGP_HELP_EXIT_OK);
276
case -3: /* --usage */
277
argp_state_help(state, state->out_stream,
278
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
279
case 'V': /* --version */
280
fprintf(state->out_stream, "%s\n", argp_program_version);
281
exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
282
95
break;
283
96
default:
284
97
return ARGP_ERR_UNKNOWN;
285
98
}
286
return errno;
99
return 0;
287
100
}
288
101
289
102
struct argp argp = { .options = options, .parser = parse_opt,
290
103
.args_doc = "",
291
104
.doc = "Mandos password-prompt -- Read and"
292
105
" output a password" };
293
ret = argp_parse(&argp, argc, argv,
294
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
295
switch(ret){
296
case 0:
297
break;
298
case ENOMEM:
299
default:
300
errno = ret;
301
error_plus(0, errno, "argp_parse");
302
return EX_OSERR;
303
case EINVAL:
304
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;
305
110
}
306
111
}
307
112
308
113
if(debug){
309
114
fprintf(stderr, "Starting %s\n", argv[0]);
310
115
}
311
312
if(conflict_detection()){
313
if(debug){
314
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
315
}
316
return EXIT_FAILURE;
317
}
318
319
116
if(debug){
320
117
fprintf(stderr, "Storing current terminal attributes\n");
321
118
}
322
119
323
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
324
int e = errno;
325
error_plus(0, errno, "tcgetattr");
326
switch(e){
327
case EBADF:
328
case ENOTTY:
329
return EX_UNAVAILABLE;
330
default:
331
return EX_OSERR;
332
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
333
123
}
334
124
335
125
sigemptyset(&new_action.sa_mask);
336
ret = sigaddset(&new_action.sa_mask, SIGINT);
337
if(ret == -1){
338
error_plus(0, errno, "sigaddset");
339
return EX_OSERR;
340
}
341
ret = sigaddset(&new_action.sa_mask, SIGHUP);
342
if(ret == -1){
343
error_plus(0, errno, "sigaddset");
344
return EX_OSERR;
345
}
346
ret = sigaddset(&new_action.sa_mask, SIGTERM);
347
if(ret == -1){
348
error_plus(0, errno, "sigaddset");
349
return EX_OSERR;
350
}
351
/* Need to check if the handler is SIG_IGN before handling:
352
| [[info:libc:Initial Signal Actions]] |
353
| [[info:libc:Basic Signal Handling]] |
354
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
355
129
ret = sigaction(SIGINT, NULL, &old_action);
356
130
if(ret == -1){
357
error_plus(0, errno, "sigaction");
358
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
359
133
}
360
134
if(old_action.sa_handler != SIG_IGN){
361
135
ret = sigaction(SIGINT, &new_action, NULL);
362
136
if(ret == -1){
363
error_plus(0, errno, "sigaction");
364
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
365
139
}
366
140
}
367
141
ret = sigaction(SIGHUP, NULL, &old_action);
368
142
if(ret == -1){
369
error_plus(0, errno, "sigaction");
370
return EX_OSERR;
143
perror("sigaction");
144
return EXIT_FAILURE;
371
145
}
372
146
if(old_action.sa_handler != SIG_IGN){
373
147
ret = sigaction(SIGHUP, &new_action, NULL);
374
148
if(ret == -1){
375
error_plus(0, errno, "sigaction");
376
return EX_OSERR;
149
perror("sigaction");
150
return EXIT_FAILURE;
377
151
}
378
152
}
379
153
ret = sigaction(SIGTERM, NULL, &old_action);
380
154
if(ret == -1){
381
error_plus(0, errno, "sigaction");
382
return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
383
157
}
384
158
if(old_action.sa_handler != SIG_IGN){
385
159
ret = sigaction(SIGTERM, &new_action, NULL);
386
160
if(ret == -1){
387
error_plus(0, errno, "sigaction");
388
return EX_OSERR;
161
perror("sigaction");
162
return EXIT_FAILURE;
389
163
}
390
164
}
391
165
395
169
}
396
170
397
171
t_new = t_old;
398
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
399
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
400
int e = errno;
401
error_plus(0, errno, "tcsetattr-echo");
402
switch(e){
403
case EBADF:
404
case ENOTTY:
405
return EX_UNAVAILABLE;
406
case EINVAL:
407
default:
408
return EX_OSERR;
409
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
410
176
}
411
177
412
178
if(debug){
413
179
fprintf(stderr, "Waiting for input from stdin \n");
414
180
}
425
191
fprintf(stderr, "%s ", prefix);
426
192
}
427
193
{
428
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
429
const char *crypttarget = getenv("CRYPTTAB_NAME");
430
/* Before cryptsetup 1.1.0~rc2 */
431
if(cryptsource == NULL){
432
cryptsource = getenv("cryptsource");
433
}
434
if(crypttarget == NULL){
435
crypttarget = getenv("crypttarget");
436
}
437
const char *const prompt1 = "Unlocking the disk";
438
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";
439
198
if(cryptsource == NULL){
440
199
if(crypttarget == NULL){
441
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
442
201
} else {
443
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
444
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
445
203
}
446
204
} else {
447
205
if(crypttarget == NULL){
448
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
449
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
450
207
} else {
451
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
452
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
453
210
}
454
211
}
455
212
}
456
sret = getline(&buffer, &n, stdin);
457
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
458
215
status = EXIT_SUCCESS;
459
216
/* Make n = data size instead of allocated buffer size */
460
n = (size_t)sret;
217
n = (size_t)ret;
461
218
/* Strip final newline */
462
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
463
220
buffer[n-1] = '\0'; /* not strictly necessary */
464
221
n--;
465
222
}
466
223
size_t written = 0;
467
224
while(written < n){
468
sret = write(STDOUT_FILENO, buffer + written, n - written);
469
if(sret < 0){
470
int e = errno;
471
error_plus(0, errno, "write");
472
switch(e){
473
case EBADF:
474
case EFAULT:
475
case EINVAL:
476
case EFBIG:
477
case EIO:
478
case ENOSPC:
479
default:
480
status = EX_IOERR;
481
break;
482
case EINTR:
483
status = EXIT_FAILURE;
484
break;
485
}
486
break;
487
}
488
written += (size_t)sret;
489
}
490
sret = close(STDOUT_FILENO);
491
if(sret == -1){
492
int e = errno;
493
error_plus(0, errno, "close");
494
switch(e){
495
case EBADF:
496
status = EX_OSFILE;
497
break;
498
case EIO:
499
default:
500
status = EX_IOERR;
501
break;
502
}
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;
503
232
}
504
233
break;
505
234
}
506
if(sret < 0){
507
int e = errno;
235
if(ret < 0){
508
236
if(errno != EINTR and not feof(stdin)){
509
error_plus(0, errno, "getline");
510
switch(e){
511
case EBADF:
512
status = EX_UNAVAILABLE;
513
break;
514
case EIO:
515
case EINVAL:
516
default:
517
status = EX_IOERR;
518
break;
519
}
237
perror("getline");
238
status = EXIT_FAILURE;
520
239
break;
521
240
}
522
241
}
523
/* if(sret == 0), then the only sensible thing to do is to retry
524
to read from stdin */
242
/* if(ret == 0), then the only sensible thing to do is to retry to
243
read from stdin */
525
244
fputc('\n', stderr);
526
245
if(debug and not quit_now){
527
/* 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
528
247
will print that later, so no need to show this too. */
529
248
fprintf(stderr, "getline() returned 0, retrying.\n");
530
249
}
536
255
fprintf(stderr, "Restoring terminal attributes\n");
537
256
}
538
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
539
error_plus(0, errno, "tcsetattr+echo");
540
}
541
542
if(quit_now){
543
sigemptyset(&old_action.sa_mask);
544
old_action.sa_handler = SIG_DFL;
545
ret = sigaction(signal_received, &old_action, NULL);
546
if(ret == -1){
547
error_plus(0, errno, "sigaction");
548
}
549
raise(signal_received);
258
perror("tcsetattr+echo");
550
259
}
551
260
552
261
if(debug){
553
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
554
263
status);
555
264
}
556
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
557
266
fputc('\n', stderr);
558
267
}
559
268
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0