To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-prompt.c
- browse files at revision 463.1.8
- compare with another revision
- download diff
- download tarball
- view history from revision 463.1.8
- Committer: teddy at bsnet
- Date: 2011-02-15 19:27:23 UTC
- mto: This revision was merged to the branch mainline in revision 465.
- Revision ID: teddy@fukt.bsnet.se-20110215192723-qpftjhlvzadm5cjc
* mandos-ctl: Use unicode string literals.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- 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 Teddy Hogeborn
6
* Copyright © 2008-2019 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
25
#define _GNU_SOURCE /* getline(), asprintf() */
27
26
28
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
29
28
TCSAFLUSH, tcgetattr(), ECHO */
30
#include <unistd.h> /* access(), struct termios,
31
tcsetattr(), STDIN_FILENO,
32
TCSAFLUSH, tcgetattr(), ECHO,
33
readlink() */
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
34
32
#include <signal.h> /* sig_atomic_t, raise(), struct
35
33
sigaction, sigemptyset(),
36
34
sigaction(), sigaddset(), SIGINT,
37
35
SIGQUIT, SIGHUP, SIGTERM,
38
36
raise() */
39
37
#include <stddef.h> /* NULL, size_t, ssize_t */
40
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
41
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t, ssize_t */
42
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
43
40
getenv(), free() */
44
41
#include <dirent.h> /* scandir(), alphasort() */
45
42
#include <stdio.h> /* fprintf(), stderr, getline(),
46
stdin, feof(), fputc(), vfprintf(),
47
vasprintf() */
43
stdin, feof(), fputc()
44
*/
48
45
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
49
46
EFAULT, EFBIG, EIO, ENOSPC, EINTR
50
47
*/
52
49
#include <iso646.h> /* or, not */
53
50
#include <stdbool.h> /* bool, false, true */
54
51
#include <inttypes.h> /* strtoumax() */
55
#include <sys/stat.h> /* struct stat, lstat(), open() */
56
#include <string.h> /* strlen, rindex, memcmp, strerror()
57
*/
52
#include <sys/stat.h> /* struct stat, lstat() */
53
#include <string.h> /* strlen, rindex, memcmp */
58
54
#include <argp.h> /* struct argp_option, struct
59
55
argp_state, struct argp,
60
56
argp_parse(), error_t,
62
58
ARGP_ERR_UNKNOWN */
63
59
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
64
60
EX_UNAVAILABLE, EX_IOERR, EX_OK */
65
#include <fcntl.h> /* open() */
66
#include <stdarg.h> /* va_list, va_start(), ... */
67
61
68
62
volatile sig_atomic_t quit_now = 0;
69
63
int signal_received;
70
64
bool debug = false;
71
65
const char *argp_program_version = "password-prompt " VERSION;
72
const char *argp_program_bug_address = "<mandos@recompile.se>";
73
74
/* Needed for conflict resolution */
75
const char plymouth_name[] = "plymouthd";
76
77
/* Function to use when printing errors */
78
__attribute__((format (gnu_printf, 3, 4)))
79
void error_plus(int status, int errnum, const char *formatstring,
80
...){
81
va_list ap;
82
char *text;
83
int ret;
84
85
va_start(ap, formatstring);
86
ret = vasprintf(&text, formatstring, ap);
87
if(ret == -1){
88
fprintf(stderr, "Mandos plugin %s: ",
89
program_invocation_short_name);
90
vfprintf(stderr, formatstring, ap);
91
fprintf(stderr, ": %s\n", strerror(errnum));
92
error(status, errno, "vasprintf while printing error");
93
return;
94
}
95
fprintf(stderr, "Mandos plugin ");
96
error(status, errnum, "%s", text);
97
free(text);
98
}
66
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
67
68
/* Needed for conflic resolution */
69
const char plymouthd_path[] = "/sbin/plymouth";
70
99
71
100
72
static void termination_handler(int signum){
101
73
if(quit_now){
107
79
108
80
bool conflict_detection(void){
109
81
110
/* plymouth conflicts with password-prompt since both want to read
111
from the terminal. Password-prompt will exit if it detects
112
plymouth since plymouth performs the same functionality.
82
/* plymouth conflicts with password-promt since both want to control the
83
associated terminal. Password-prompt exit since plymouth perferms the same
84
functionallity.
113
85
*/
114
if(access("/run/plymouth/pid", R_OK) == 0){
115
return true;
116
}
117
118
__attribute__((nonnull))
119
86
int is_plymouth(const struct dirent *proc_entry){
120
87
int ret;
121
int cl_fd;
122
88
{
123
uintmax_t proc_id;
89
uintmax_t maxvalue;
124
90
char *tmp;
125
91
errno = 0;
126
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
92
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
127
93
128
94
if(errno != 0 or *tmp != '\0'
129
or proc_id != (uintmax_t)((pid_t)proc_id)){
95
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
130
96
return 0;
131
97
}
132
98
}
133
134
char *cmdline_filename;
135
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
136
proc_entry->d_name);
99
char exe_target[sizeof(plymouthd_path)];
100
char *exe_link;
101
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
137
102
if(ret == -1){
138
error_plus(0, errno, "asprintf");
103
error(0, errno, "asprintf");
139
104
return 0;
140
105
}
141
142
/* Open /proc/<pid>/cmdline */
143
cl_fd = open(cmdline_filename, O_RDONLY);
144
free(cmdline_filename);
145
if(cl_fd == -1){
106
107
struct stat exe_stat;
108
ret = lstat(exe_link, &exe_stat);
109
if(ret == -1){
110
free(exe_link);
146
111
if(errno != ENOENT){
147
error_plus(0, errno, "open");
148
}
149
return 0;
150
}
151
152
char *cmdline = NULL;
153
{
154
size_t cmdline_len = 0;
155
size_t cmdline_allocated = 0;
156
char *tmp;
157
const size_t blocksize = 1024;
158
ssize_t sret;
159
do {
160
/* Allocate more space? */
161
if(cmdline_len + blocksize + 1 > cmdline_allocated){
162
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
163
if(tmp == NULL){
164
error_plus(0, errno, "realloc");
165
free(cmdline);
166
close(cl_fd);
167
return 0;
168
}
169
cmdline = tmp;
170
cmdline_allocated += blocksize;
171
}
172
173
/* Read data */
174
sret = read(cl_fd, cmdline + cmdline_len,
175
cmdline_allocated - cmdline_len);
176
if(sret == -1){
177
error_plus(0, errno, "read");
178
free(cmdline);
179
close(cl_fd);
180
return 0;
181
}
182
cmdline_len += (size_t)sret;
183
} while(sret != 0);
184
ret = close(cl_fd);
185
if(ret == -1){
186
error_plus(0, errno, "close");
187
free(cmdline);
188
return 0;
189
}
190
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
191
}
192
/* we now have cmdline */
193
194
/* get basename */
195
char *cmdline_base = strrchr(cmdline, '/');
196
if(cmdline_base != NULL){
197
cmdline_base += 1; /* skip the slash */
198
} else {
199
cmdline_base = cmdline;
200
}
201
202
if(strcmp(cmdline_base, plymouth_name) != 0){
203
if(debug){
204
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
205
plymouth_name);
206
}
207
free(cmdline);
208
return 0;
209
}
210
if(debug){
211
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
212
plymouth_name);
213
}
214
free(cmdline);
112
error(0, errno, "lstat");
113
}
114
return 0;
115
}
116
117
if(not S_ISLNK(exe_stat.st_mode)
118
or exe_stat.st_uid != 0
119
or exe_stat.st_gid != 0){
120
free(exe_link);
121
return 0;
122
}
123
124
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
125
free(exe_link);
126
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
127
(memcmp(plymouthd_path, exe_target,
128
sizeof(plymouthd_path)-1) != 0)){
129
return 0;
130
}
215
131
return 1;
216
132
}
217
218
struct dirent **direntries = NULL;
133
134
struct dirent **direntries;
219
135
int ret;
220
136
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
221
if(ret == -1){
222
error_plus(1, errno, "scandir");
223
}
224
{
225
int i = ret;
226
while(i--){
227
free(direntries[i]);
228
}
229
}
230
free(direntries);
231
return ret > 0;
137
if (ret == -1){
138
error(1, errno, "scandir");
139
}
140
if (ret < 0){
141
return 1;
142
} else {
143
return 0;
144
}
232
145
}
233
146
234
147
239
152
struct termios t_new, t_old;
240
153
char *buffer = NULL;
241
154
char *prefix = NULL;
242
char *prompt = NULL;
243
155
int status = EXIT_SUCCESS;
244
156
struct sigaction old_action,
245
157
new_action = { .sa_handler = termination_handler,
249
161
{ .name = "prefix", .key = 'p',
250
162
.arg = "PREFIX", .flags = 0,
251
163
.doc = "Prefix shown before the prompt", .group = 2 },
252
{ .name = "prompt", .key = 129,
253
.arg = "PROMPT", .flags = 0,
254
.doc = "The prompt to show", .group = 2 },
255
164
{ .name = "debug", .key = 128,
256
165
.doc = "Debug mode", .group = 3 },
257
166
/*
266
175
{ .name = NULL }
267
176
};
268
177
269
__attribute__((nonnull(3)))
270
178
error_t parse_opt (int key, char *arg, struct argp_state *state){
271
179
errno = 0;
272
180
switch (key){
273
case 'p': /* --prefix */
181
case 'p':
274
182
prefix = arg;
275
183
break;
276
case 128: /* --debug */
184
case 128:
277
185
debug = true;
278
186
break;
279
case 129: /* --prompt */
280
prompt = arg;
281
break;
282
187
/*
283
188
* These reproduce what we would get without ARGP_NO_HELP
284
189
*/
286
191
argp_state_help(state, state->out_stream,
287
192
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
288
193
& ~(unsigned int)ARGP_HELP_EXIT_OK);
289
__builtin_unreachable();
290
194
case -3: /* --usage */
291
195
argp_state_help(state, state->out_stream,
292
196
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
293
__builtin_unreachable();
294
197
case 'V': /* --version */
295
198
fprintf(state->out_stream, "%s\n", argp_program_version);
296
199
exit(argp_err_exit_status);
313
216
case ENOMEM:
314
217
default:
315
218
errno = ret;
316
error_plus(0, errno, "argp_parse");
219
error(0, errno, "argp_parse");
317
220
return EX_OSERR;
318
221
case EINVAL:
319
222
return EX_USAGE;
324
227
fprintf(stderr, "Starting %s\n", argv[0]);
325
228
}
326
229
327
if(conflict_detection()){
230
if (conflict_detection()){
328
231
if(debug){
329
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
232
fprintf(stderr, "Stopping %s because of conflict", argv[0]);
330
233
}
331
234
return EXIT_FAILURE;
332
235
}
337
240
338
241
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
339
242
int e = errno;
340
error_plus(0, errno, "tcgetattr");
243
error(0, errno, "tcgetattr");
341
244
switch(e){
342
245
case EBADF:
343
246
case ENOTTY:
350
253
sigemptyset(&new_action.sa_mask);
351
254
ret = sigaddset(&new_action.sa_mask, SIGINT);
352
255
if(ret == -1){
353
error_plus(0, errno, "sigaddset");
256
error(0, errno, "sigaddset");
354
257
return EX_OSERR;
355
258
}
356
259
ret = sigaddset(&new_action.sa_mask, SIGHUP);
357
260
if(ret == -1){
358
error_plus(0, errno, "sigaddset");
261
error(0, errno, "sigaddset");
359
262
return EX_OSERR;
360
263
}
361
264
ret = sigaddset(&new_action.sa_mask, SIGTERM);
362
265
if(ret == -1){
363
error_plus(0, errno, "sigaddset");
266
error(0, errno, "sigaddset");
364
267
return EX_OSERR;
365
268
}
366
269
/* Need to check if the handler is SIG_IGN before handling:
369
272
*/
370
273
ret = sigaction(SIGINT, NULL, &old_action);
371
274
if(ret == -1){
372
error_plus(0, errno, "sigaction");
275
error(0, errno, "sigaction");
373
276
return EX_OSERR;
374
277
}
375
278
if(old_action.sa_handler != SIG_IGN){
376
279
ret = sigaction(SIGINT, &new_action, NULL);
377
280
if(ret == -1){
378
error_plus(0, errno, "sigaction");
281
error(0, errno, "sigaction");
379
282
return EX_OSERR;
380
283
}
381
284
}
382
285
ret = sigaction(SIGHUP, NULL, &old_action);
383
286
if(ret == -1){
384
error_plus(0, errno, "sigaction");
287
error(0, errno, "sigaction");
385
288
return EX_OSERR;
386
289
}
387
290
if(old_action.sa_handler != SIG_IGN){
388
291
ret = sigaction(SIGHUP, &new_action, NULL);
389
292
if(ret == -1){
390
error_plus(0, errno, "sigaction");
293
error(0, errno, "sigaction");
391
294
return EX_OSERR;
392
295
}
393
296
}
394
297
ret = sigaction(SIGTERM, NULL, &old_action);
395
298
if(ret == -1){
396
error_plus(0, errno, "sigaction");
299
error(0, errno, "sigaction");
397
300
return EX_OSERR;
398
301
}
399
302
if(old_action.sa_handler != SIG_IGN){
400
303
ret = sigaction(SIGTERM, &new_action, NULL);
401
304
if(ret == -1){
402
error_plus(0, errno, "sigaction");
305
error(0, errno, "sigaction");
403
306
return EX_OSERR;
404
307
}
405
308
}
413
316
t_new.c_lflag &= ~(tcflag_t)ECHO;
414
317
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
415
318
int e = errno;
416
error_plus(0, errno, "tcsetattr-echo");
319
error(0, errno, "tcsetattr-echo");
417
320
switch(e){
418
321
case EBADF:
419
322
case ENOTTY:
439
342
if(prefix){
440
343
fprintf(stderr, "%s ", prefix);
441
344
}
442
if(prompt != NULL){
443
fprintf(stderr, "%s: ", prompt);
444
} else {
345
{
445
346
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
446
347
const char *crypttarget = getenv("CRYPTTAB_NAME");
447
348
/* Before cryptsetup 1.1.0~rc2 */
485
386
sret = write(STDOUT_FILENO, buffer + written, n - written);
486
387
if(sret < 0){
487
388
int e = errno;
488
error_plus(0, errno, "write");
389
error(0, errno, "write");
489
390
switch(e){
490
391
case EBADF:
491
392
case EFAULT:
507
408
sret = close(STDOUT_FILENO);
508
409
if(sret == -1){
509
410
int e = errno;
510
error_plus(0, errno, "close");
411
error(0, errno, "close");
511
412
switch(e){
512
413
case EBADF:
513
414
status = EX_OSFILE;
522
423
}
523
424
if(sret < 0){
524
425
int e = errno;
525
if(errno != EINTR){
526
if(not feof(stdin)){
527
error_plus(0, errno, "getline");
528
switch(e){
529
case EBADF:
530
status = EX_UNAVAILABLE;
531
break;
532
case EIO:
533
case EINVAL:
534
default:
535
status = EX_IOERR;
536
break;
537
}
426
if(errno != EINTR and not feof(stdin)){
427
error(0, errno, "getline");
428
switch(e){
429
case EBADF:
430
status = EX_UNAVAILABLE;
431
case EIO:
432
case EINVAL:
433
default:
434
status = EX_IOERR;
538
435
break;
539
} else {
540
clearerr(stdin);
541
436
}
437
break;
542
438
}
543
439
}
544
/* if(sret == 0), then the only sensible thing to do is to retry
545
to read from stdin */
440
/* if(sret == 0), then the only sensible thing to do is to retry to
441
read from stdin */
546
442
fputc('\n', stderr);
547
443
if(debug and not quit_now){
548
444
/* If quit_now is nonzero, we were interrupted by a signal, and
557
453
fprintf(stderr, "Restoring terminal attributes\n");
558
454
}
559
455
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
560
error_plus(0, errno, "tcsetattr+echo");
456
error(0, errno, "tcsetattr+echo");
561
457
}
562
458
563
459
if(quit_now){
565
461
old_action.sa_handler = SIG_DFL;
566
462
ret = sigaction(signal_received, &old_action, NULL);
567
463
if(ret == -1){
568
error_plus(0, errno, "sigaction");
464
error(0, errno, "sigaction");
569
465
}
570
466
raise(signal_received);
571
467
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0