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- Committer: Björn Påhlsson
- Date: 2010-09-02 18:53:38 UTC
- mto: (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 421.
- Revision ID: belorn@fukt.bsnet.se-20100902185338-d1022sv517txn3sb
early commit to ease todays coding
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- 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 © 2008-2019, 2021-2022 Teddy Hogeborn
6
* Copyright © 2008-2019, 2021-2022 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* vasprintf(),
27
program_invocation_short_name,
28
asprintf(), getline() */
29
#include <sys/types.h> /* sig_atomic_t, pid_t */
25
#define _GNU_SOURCE /* getline() */
26
27
#include <termios.h> /* struct termios, tcsetattr(),
28
TCSAFLUSH, tcgetattr(), ECHO */
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO */
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
sigaction, sigemptyset(),
34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t */
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getenv() */
41
#include <stdio.h> /* fprintf(), stderr, getline(),
42
stdin, feof(), perror(), fputc()
43
*/
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
46
*/
47
#include <iso646.h> /* or, not */
30
48
#include <stdbool.h> /* bool, false, true */
31
#include <argp.h> /* argp_program_version,
32
argp_program_bug_address,
33
struct argp_option,
34
struct argp_state, argp_state_help,
35
ARGP_HELP_STD_HELP,
36
ARGP_HELP_EXIT_ERR,
37
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
38
argp_err_exit_status,
39
ARGP_ERR_UNKNOWN, argp_parse(),
40
ARGP_IN_ORDER, ARGP_NO_HELP */
41
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
42
#include <stdio.h> /* vasprintf(), fprintf(), stderr,
43
vfprintf(), asprintf(), getline(),
44
stdin, feof(), clearerr(),
45
fputc() */
46
#include <errno.h> /* program_invocation_short_name,
47
errno, ENOENT, error_t, ENOMEM,
48
EINVAL, EBADF, ENOTTY, EFAULT,
49
EFBIG, EIO, ENOSPC, EINTR */
50
#include <string.h> /* strerror(), strrchr(), strcmp() */
51
#include <error.h> /* error() */
52
#include <stdlib.h> /* free(), realloc(), EXIT_SUCCESS,
53
EXIT_FAILURE, getenv() */
54
#include <unistd.h> /* access(), R_OK, ssize_t, close(),
55
read(), STDIN_FILENO, write(),
56
STDOUT_FILENO */
57
#include <dirent.h> /* struct dirent, scandir(),
58
alphasort() */
59
#include <inttypes.h> /* uintmax_t, strtoumax() */
60
#include <iso646.h> /* or, and, not */
61
#include <fcntl.h> /* open(), O_RDONLY */
62
#include <stddef.h> /* NULL, size_t */
63
#include <termios.h> /* struct termios, tcgetattr(),
64
tcflag_t, ECHO, tcsetattr(),
65
TCSAFLUSH */
66
#include <signal.h> /* struct sigaction, sigemptyset(),
67
sigaddset(), SIGINT, SIGHUP,
68
SIGTERM, SIG_IGN, SIG_DFL,
69
raise() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
71
EX_IOERR, EX_OSFILE, EX_OK */
49
#include <string.h> /* strlen, rindex */
50
#include <argp.h> /* struct argp_option, struct
51
argp_state, struct argp,
52
argp_parse(), error_t,
53
ARGP_KEY_ARG, ARGP_KEY_END,
54
ARGP_ERR_UNKNOWN */
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
72
57
73
58
volatile sig_atomic_t quit_now = 0;
74
59
int signal_received;
75
60
bool debug = false;
76
61
const char *argp_program_version = "password-prompt " VERSION;
77
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
79
/* Needed for conflict resolution */
80
const char plymouth_name[] = "plymouthd";
81
82
/* Function to use when printing errors */
83
__attribute__((format (gnu_printf, 3, 4)))
84
void error_plus(int status, int errnum, const char *formatstring,
85
...){
86
va_list ap;
87
char *text;
88
int ret;
89
90
va_start(ap, formatstring);
91
ret = vasprintf(&text, formatstring, ap);
92
if(ret == -1){
93
fprintf(stderr, "Mandos plugin %s: ",
94
program_invocation_short_name);
95
vfprintf(stderr, formatstring, ap);
96
fprintf(stderr, ": %s\n", strerror(errnum));
97
error(status, errno, "vasprintf while printing error");
98
return;
99
}
100
fprintf(stderr, "Mandos plugin ");
101
error(status, errnum, "%s", text);
102
free(text);
103
}
62
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
63
105
64
static void termination_handler(int signum){
106
65
if(quit_now){
110
69
signal_received = signum;
111
70
}
112
71
113
bool conflict_detection(void){
114
115
/* plymouth conflicts with password-prompt since both want to read
116
from the terminal. Password-prompt will exit if it detects
117
plymouth since plymouth performs the same functionality.
118
*/
119
if(access("/run/plymouth/pid", R_OK) == 0){
120
return true;
121
}
122
123
__attribute__((nonnull))
124
int is_plymouth(const struct dirent *proc_entry){
125
int ret;
126
int cl_fd;
127
{
128
uintmax_t proc_id;
129
char *tmp;
130
errno = 0;
131
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
132
133
if(errno != 0 or *tmp != '\0'
134
or proc_id != (uintmax_t)((pid_t)proc_id)){
135
return 0;
136
}
137
}
138
139
char *cmdline_filename;
140
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
141
proc_entry->d_name);
142
if(ret == -1){
143
error_plus(0, errno, "asprintf");
144
return 0;
145
}
146
147
/* Open /proc/<pid>/cmdline */
148
cl_fd = open(cmdline_filename, O_RDONLY);
149
free(cmdline_filename);
150
if(cl_fd == -1){
151
if(errno != ENOENT){
152
error_plus(0, errno, "open");
153
}
154
return 0;
155
}
156
157
char *cmdline = NULL;
158
{
159
size_t cmdline_len = 0;
160
size_t cmdline_allocated = 0;
161
char *tmp;
162
const size_t blocksize = 1024;
163
ssize_t sret;
164
do {
165
/* Allocate more space? */
166
if(cmdline_len + blocksize + 1 > cmdline_allocated){
167
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
168
if(tmp == NULL){
169
error_plus(0, errno, "realloc");
170
free(cmdline);
171
close(cl_fd);
172
return 0;
173
}
174
cmdline = tmp;
175
cmdline_allocated += blocksize;
176
}
177
178
/* Read data */
179
sret = read(cl_fd, cmdline + cmdline_len,
180
cmdline_allocated - cmdline_len);
181
if(sret == -1){
182
error_plus(0, errno, "read");
183
free(cmdline);
184
close(cl_fd);
185
return 0;
186
}
187
cmdline_len += (size_t)sret;
188
} while(sret != 0);
189
ret = close(cl_fd);
190
if(ret == -1){
191
error_plus(0, errno, "close");
192
free(cmdline);
193
return 0;
194
}
195
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
196
}
197
/* we now have cmdline */
198
199
/* get basename */
200
char *cmdline_base = strrchr(cmdline, '/');
201
if(cmdline_base != NULL){
202
cmdline_base += 1; /* skip the slash */
203
} else {
204
cmdline_base = cmdline;
205
}
206
207
if(strcmp(cmdline_base, plymouth_name) != 0){
208
if(debug){
209
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
210
plymouth_name);
211
}
212
free(cmdline);
213
return 0;
214
}
215
if(debug){
216
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
217
plymouth_name);
218
}
219
free(cmdline);
220
return 1;
221
}
222
223
struct dirent **direntries = NULL;
224
int ret;
225
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
226
if(ret == -1){
227
error_plus(1, errno, "scandir");
228
}
229
{
230
int i = ret;
231
while(i--){
232
free(direntries[i]);
233
}
234
}
235
free(direntries);
236
return ret > 0;
237
}
238
239
240
72
int main(int argc, char **argv){
241
ssize_t sret;
242
int ret;
73
ssize_t ret;
243
74
size_t n;
244
75
struct termios t_new, t_old;
245
76
char *buffer = NULL;
246
77
char *prefix = NULL;
247
char *prompt = NULL;
248
78
int status = EXIT_SUCCESS;
249
79
struct sigaction old_action,
250
80
new_action = { .sa_handler = termination_handler,
254
84
{ .name = "prefix", .key = 'p',
255
85
.arg = "PREFIX", .flags = 0,
256
86
.doc = "Prefix shown before the prompt", .group = 2 },
257
{ .name = "prompt", .key = 129,
258
.arg = "PROMPT", .flags = 0,
259
.doc = "The prompt to show", .group = 2 },
260
87
{ .name = "debug", .key = 128,
261
88
.doc = "Debug mode", .group = 3 },
262
89
/*
271
98
{ .name = NULL }
272
99
};
273
100
274
__attribute__((nonnull(3)))
275
101
error_t parse_opt (int key, char *arg, struct argp_state *state){
276
102
errno = 0;
277
103
switch (key){
278
case 'p': /* --prefix */
104
case 'p':
279
105
prefix = arg;
280
106
break;
281
case 128: /* --debug */
107
case 128:
282
108
debug = true;
283
109
break;
284
case 129: /* --prompt */
285
prompt = arg;
286
break;
287
110
/*
288
111
* These reproduce what we would get without ARGP_NO_HELP
289
112
*/
291
114
argp_state_help(state, state->out_stream,
292
115
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
293
116
& ~(unsigned int)ARGP_HELP_EXIT_OK);
294
__builtin_unreachable();
295
117
case -3: /* --usage */
296
118
argp_state_help(state, state->out_stream,
297
119
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
298
__builtin_unreachable();
299
120
case 'V': /* --version */
300
121
fprintf(state->out_stream, "%s\n", argp_program_version);
301
122
exit(argp_err_exit_status);
318
139
case ENOMEM:
319
140
default:
320
141
errno = ret;
321
error_plus(0, errno, "argp_parse");
142
perror("argp_parse");
322
143
return EX_OSERR;
323
144
case EINVAL:
324
145
return EX_USAGE;
328
149
if(debug){
329
150
fprintf(stderr, "Starting %s\n", argv[0]);
330
151
}
331
332
if(conflict_detection()){
333
if(debug){
334
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
335
}
336
return EXIT_FAILURE;
337
}
338
339
152
if(debug){
340
153
fprintf(stderr, "Storing current terminal attributes\n");
341
154
}
342
155
343
156
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
344
157
int e = errno;
345
error_plus(0, errno, "tcgetattr");
158
perror("tcgetattr");
346
159
switch(e){
347
160
case EBADF:
348
161
case ENOTTY:
355
168
sigemptyset(&new_action.sa_mask);
356
169
ret = sigaddset(&new_action.sa_mask, SIGINT);
357
170
if(ret == -1){
358
error_plus(0, errno, "sigaddset");
171
perror("sigaddset");
359
172
return EX_OSERR;
360
173
}
361
174
ret = sigaddset(&new_action.sa_mask, SIGHUP);
362
175
if(ret == -1){
363
error_plus(0, errno, "sigaddset");
176
perror("sigaddset");
364
177
return EX_OSERR;
365
178
}
366
179
ret = sigaddset(&new_action.sa_mask, SIGTERM);
367
180
if(ret == -1){
368
error_plus(0, errno, "sigaddset");
181
perror("sigaddset");
369
182
return EX_OSERR;
370
183
}
371
184
/* Need to check if the handler is SIG_IGN before handling:
374
187
*/
375
188
ret = sigaction(SIGINT, NULL, &old_action);
376
189
if(ret == -1){
377
error_plus(0, errno, "sigaction");
190
perror("sigaction");
378
191
return EX_OSERR;
379
192
}
380
193
if(old_action.sa_handler != SIG_IGN){
381
194
ret = sigaction(SIGINT, &new_action, NULL);
382
195
if(ret == -1){
383
error_plus(0, errno, "sigaction");
196
perror("sigaction");
384
197
return EX_OSERR;
385
198
}
386
199
}
387
200
ret = sigaction(SIGHUP, NULL, &old_action);
388
201
if(ret == -1){
389
error_plus(0, errno, "sigaction");
202
perror("sigaction");
390
203
return EX_OSERR;
391
204
}
392
205
if(old_action.sa_handler != SIG_IGN){
393
206
ret = sigaction(SIGHUP, &new_action, NULL);
394
207
if(ret == -1){
395
error_plus(0, errno, "sigaction");
208
perror("sigaction");
396
209
return EX_OSERR;
397
210
}
398
211
}
399
212
ret = sigaction(SIGTERM, NULL, &old_action);
400
213
if(ret == -1){
401
error_plus(0, errno, "sigaction");
214
perror("sigaction");
402
215
return EX_OSERR;
403
216
}
404
217
if(old_action.sa_handler != SIG_IGN){
405
218
ret = sigaction(SIGTERM, &new_action, NULL);
406
219
if(ret == -1){
407
error_plus(0, errno, "sigaction");
220
perror("sigaction");
408
221
return EX_OSERR;
409
222
}
410
223
}
418
231
t_new.c_lflag &= ~(tcflag_t)ECHO;
419
232
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
420
233
int e = errno;
421
error_plus(0, errno, "tcsetattr-echo");
234
perror("tcsetattr-echo");
422
235
switch(e){
423
236
case EBADF:
424
237
case ENOTTY:
444
257
if(prefix){
445
258
fprintf(stderr, "%s ", prefix);
446
259
}
447
if(prompt != NULL){
448
fprintf(stderr, "%s: ", prompt);
449
} else {
260
{
450
261
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
451
262
const char *crypttarget = getenv("CRYPTTAB_NAME");
452
263
/* Before cryptsetup 1.1.0~rc2 */
475
286
}
476
287
}
477
288
}
478
sret = getline(&buffer, &n, stdin);
479
if(sret > 0){
289
ret = getline(&buffer, &n, stdin);
290
if(ret > 0){
480
291
status = EXIT_SUCCESS;
481
292
/* Make n = data size instead of allocated buffer size */
482
n = (size_t)sret;
293
n = (size_t)ret;
483
294
/* Strip final newline */
484
295
if(n > 0 and buffer[n-1] == '\n'){
485
296
buffer[n-1] = '\0'; /* not strictly necessary */
487
298
}
488
299
size_t written = 0;
489
300
while(written < n){
490
sret = write(STDOUT_FILENO, buffer + written, n - written);
491
if(sret < 0){
301
ret = write(STDOUT_FILENO, buffer + written, n - written);
302
if(ret < 0){
492
303
int e = errno;
493
error_plus(0, errno, "write");
304
perror("write");
494
305
switch(e){
495
306
case EBADF:
496
307
case EFAULT:
507
318
}
508
319
break;
509
320
}
510
written += (size_t)sret;
321
written += (size_t)ret;
511
322
}
512
sret = close(STDOUT_FILENO);
513
if(sret == -1){
323
ret = close(STDOUT_FILENO);
324
if(ret == -1){
514
325
int e = errno;
515
error_plus(0, errno, "close");
326
perror("close");
516
327
switch(e){
517
328
case EBADF:
518
329
status = EX_OSFILE;
525
336
}
526
337
break;
527
338
}
528
if(sret < 0){
339
if(ret < 0){
529
340
int e = errno;
530
if(errno != EINTR){
531
if(not feof(stdin)){
532
error_plus(0, errno, "getline");
533
switch(e){
534
case EBADF:
535
status = EX_UNAVAILABLE;
536
break;
537
case EIO:
538
case EINVAL:
539
default:
540
status = EX_IOERR;
541
break;
542
}
341
if(errno != EINTR and not feof(stdin)){
342
perror("getline");
343
switch(e){
344
case EBADF:
345
status = EX_UNAVAILABLE;
346
case EIO:
347
case EINVAL:
348
default:
349
status = EX_IOERR;
543
350
break;
544
} else {
545
clearerr(stdin);
546
351
}
352
break;
547
353
}
548
354
}
549
/* if(sret == 0), then the only sensible thing to do is to retry
550
to read from stdin */
355
/* if(ret == 0), then the only sensible thing to do is to retry to
356
read from stdin */
551
357
fputc('\n', stderr);
552
358
if(debug and not quit_now){
553
359
/* If quit_now is nonzero, we were interrupted by a signal, and
562
368
fprintf(stderr, "Restoring terminal attributes\n");
563
369
}
564
370
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
565
error_plus(0, errno, "tcsetattr+echo");
371
perror("tcsetattr+echo");
566
372
}
567
373
568
374
if(quit_now){
570
376
old_action.sa_handler = SIG_DFL;
571
377
ret = sigaction(signal_received, &old_action, NULL);
572
378
if(ret == -1){
573
error_plus(0, errno, "sigaction");
379
perror("sigaction");
574
380
}
575
381
raise(signal_received);
576
382
}
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