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- Committer: Teddy Hogeborn
- Date: 2008-09-24 23:03:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20080924230331-2qvhppypeo852ksr
* Makefile (PLUGINS): Added "plugins.d/usplash".
(install-client-nokey): Add setuid bit on "plugins.d/usplash".
* plugins.d/splashy.c (main): Move "sret" to top.
* plugins.d/usplash: Removed.
* plugins.d/usplash.c: New.
(install-client-nokey): Add setuid bit on "plugins.d/usplash".
* plugins.d/splashy.c (main): Move "sret" to top.
* plugins.d/usplash: Removed.
* plugins.d/usplash.c: New.
- files added:
- debian/mandos-client.config
- files removed:
- NEWS
- files modified:
- .bzrignore
added
removed
plugins.d/usplash.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Usplash - Read a password from usplash and output it
4
*
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
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
17
*
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
*
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
24
*/
25
26
1
#define _GNU_SOURCE /* asprintf() */
27
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
sigemptyset(), sigaddset(), SIGINT,
29
SIGHUP, SIGTERM, sigaction(),
30
SIG_IGN, kill(), SIGKILL */
31
#include <stdbool.h> /* bool, false, true */
32
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
33
#include <iso646.h> /* and, or, not*/
34
#include <errno.h> /* errno, EINTR */
35
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
36
dirent */
3
sigemptyset(), sigaddset(),
4
sigaction, SIGINT, SIG_IGN, SIGHUP,
5
SIGTERM, kill(), SIGKILL */
37
6
#include <stddef.h> /* NULL */
38
#include <string.h> /* strlen(), memcmp() */
7
#include <stdlib.h> /* getenv() */
39
8
#include <stdio.h> /* asprintf(), perror() */
40
#include <unistd.h> /* close(), write(), readlink(),
41
read(), STDOUT_FILENO, sleep(),
42
fork(), setuid(), geteuid(),
43
setsid(), chdir(), dup2(),
44
STDERR_FILENO, execv() */
45
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
46
realloc(), EXIT_SUCCESS, malloc(),
47
_exit() */
48
#include <stdlib.h> /* getenv() */
9
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS,
10
strtoul(), free() */
11
#include <sys/types.h> /* pid_t, DIR, struct dirent,
12
ssize_t */
49
13
#include <dirent.h> /* opendir(), readdir(), closedir() */
50
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
14
#include <unistd.h> /* readlink(), fork(), execl(),
15
_exit */
16
#include <string.h> /* memcmp() */
17
#include <iso646.h> /* and */
18
#include <stdbool.h> /* bool, false, true */
19
#include <errno.h> /* errno */
20
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
21
WEXITSTATUS() */
22
#include <fcntl.h> /* open(), O_RDONLY */
51
23
52
24
sig_atomic_t interrupted_by_signal = 0;
53
25
55
27
interrupted_by_signal = 1;
56
28
}
57
29
58
static bool usplash_write(const char *cmd, const char *arg){
59
/*
60
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
61
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
62
* SEE ALSO
63
* usplash_write(8)
64
*/
65
int ret;
66
int fifo_fd;
67
do{
68
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
69
if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
70
return false;
71
}
72
}while(fifo_fd == -1);
73
74
const char *cmd_line;
75
size_t cmd_line_len;
76
char *cmd_line_alloc = NULL;
77
if(arg == NULL){
78
cmd_line = cmd;
79
cmd_line_len = strlen(cmd);
80
}else{
81
do{
82
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
83
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
84
int e = errno;
85
close(fifo_fd);
86
errno = e;
87
return false;
88
}
89
}while(ret == -1);
90
cmd_line = cmd_line_alloc;
91
cmd_line_len = (size_t)ret + 1;
92
}
93
94
size_t written = 0;
95
ssize_t sret = 0;
96
while(not interrupted_by_signal and written < cmd_line_len){
97
sret = write(fifo_fd, cmd_line + written,
98
cmd_line_len - written);
99
if(sret == -1){
100
if(errno != EINTR or interrupted_by_signal){
101
int e = errno;
102
close(fifo_fd);
103
free(cmd_line_alloc);
104
errno = e;
105
return false;
106
} else {
107
continue;
108
}
109
}
110
written += (size_t)sret;
111
}
112
free(cmd_line_alloc);
113
do{
114
ret = close(fifo_fd);
115
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
116
return false;
117
}
118
}while(ret == -1);
119
if(interrupted_by_signal){
120
return false;
121
}
122
return true;
123
}
124
125
30
int main(__attribute__((unused))int argc,
126
31
__attribute__((unused))char **argv){
127
32
int ret = 0;
133
38
{
134
39
const char *const cryptsource = getenv("cryptsource");
135
40
const char *const crypttarget = getenv("crypttarget");
136
const char prompt_start[] = "Enter passphrase to unlock the disk";
41
const char *const prompt_start = "Enter passphrase to unlock the disk";
137
42
138
43
if(cryptsource == NULL){
139
44
if(crypttarget == NULL){
159
64
pid_t usplash_pid = 0;
160
65
char *cmdline = NULL;
161
66
size_t cmdline_len = 0;
162
const char usplash_name[] = "/sbin/usplash";
163
67
{
68
const char usplash_name[] = "/sbin/usplash";
164
69
DIR *proc_dir = opendir("/proc");
165
70
if(proc_dir == NULL){
166
71
free(prompt);
179
84
/proc/<pid>/exe link */
180
85
char exe_target[sizeof(usplash_name)];
181
86
{
182
/* create file name string */
183
87
char *exe_link;
184
88
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
185
89
if(ret == -1){
188
92
closedir(proc_dir);
189
93
return EXIT_FAILURE;
190
94
}
191
192
/* Check that it refers to a symlink owned by root:root */
193
struct stat exe_stat;
194
ret = lstat(exe_link, &exe_stat);
195
if(ret == -1){
196
perror("lstat");
197
free(exe_link);
198
free(prompt);
199
closedir(proc_dir);
200
return EXIT_FAILURE;
201
}
202
if(not S_ISLNK(exe_stat.st_mode)
203
or exe_stat.st_uid != 0
204
or exe_stat.st_gid != 0){
205
free(exe_link);
206
continue;
207
}
208
209
95
sret = readlink(exe_link, exe_target, sizeof(exe_target));
210
96
free(exe_link);
211
if(sret == -1){
212
continue;
213
}
214
97
}
215
98
if((sret == ((ssize_t)sizeof(exe_target)-1))
216
99
and (memcmp(usplash_name, exe_target,
294
177
free(prompt);
295
178
return EXIT_FAILURE;
296
179
}
297
if(old_action.sa_handler != SIG_IGN){
180
if (old_action.sa_handler != SIG_IGN){
298
181
ret = sigaction(SIGINT, &new_action, NULL);
299
182
if(ret == -1){
300
183
perror("sigaction");
308
191
free(prompt);
309
192
return EXIT_FAILURE;
310
193
}
311
if(old_action.sa_handler != SIG_IGN){
194
if (old_action.sa_handler != SIG_IGN){
312
195
ret = sigaction(SIGHUP, &new_action, NULL);
313
196
if(ret == -1){
314
197
perror("sigaction");
322
205
free(prompt);
323
206
return EXIT_FAILURE;
324
207
}
325
if(old_action.sa_handler != SIG_IGN){
208
if (old_action.sa_handler != SIG_IGN){
326
209
ret = sigaction(SIGTERM, &new_action, NULL);
327
210
if(ret == -1){
328
211
perror("sigaction");
334
217
335
218
/* Write command to FIFO */
336
219
if(not interrupted_by_signal){
337
if(not usplash_write("TIMEOUT", "0")
338
and (errno != EINTR)){
339
perror("usplash_write");
340
an_error_occured = true;
341
}
342
}
343
if(not interrupted_by_signal and not an_error_occured){
344
if(not usplash_write("INPUTQUIET", prompt)
345
and (errno != EINTR)){
346
perror("usplash_write");
347
an_error_occured = true;
348
}
349
}
350
free(prompt);
220
int fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
221
if(fifo_fd == -1){
222
perror("open");
223
free(prompt);
224
return EXIT_FAILURE;
225
}
226
char *command;
227
ret = asprintf(&command, "INPUTQUIET %s", prompt);
228
if(ret == -1){
229
perror("asprintf");
230
free(prompt);
231
return EXIT_FAILURE;
232
}
233
free(prompt);
234
235
size_t command_len = (size_t)ret + 1;
236
size_t written = 0;
237
while(not interrupted_by_signal and written < command_len){
238
ret = write(fifo_fd, command + written, command_len - written);
239
if(ret == -1){
240
if(interrupted_by_signal){
241
break;
242
}
243
perror("write");
244
if(written == 0){
245
free(command);
246
return EXIT_FAILURE;
247
}
248
an_error_occured = true;
249
break;
250
}
251
written += (size_t)ret;
252
}
253
ret = close(fifo_fd);
254
if(ret == -1 and not interrupted_by_signal){
255
an_error_occured = true;
256
}
257
free(command);
258
}else{
259
free(prompt);
260
}
351
261
352
/* This is not really a loop; while() is used to be able to "break"
353
out of it; those breaks are marked "Big" */
354
while(not interrupted_by_signal and not an_error_occured){
262
{
355
263
char *buf = NULL;
356
264
size_t buf_len = 0;
357
265
358
/* Open FIFO */
359
int fifo_fd;
360
do{
361
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
362
if(fifo_fd == -1){
363
if(errno != EINTR){
364
perror("open");
365
an_error_occured = true;
366
break;
367
}
368
if(interrupted_by_signal){
369
break;
370
}
371
}
372
}while(fifo_fd == -1);
373
if(interrupted_by_signal or an_error_occured){
374
break; /* Big */
375
}
376
377
266
/* Read from FIFO */
378
size_t buf_allocated = 0;
379
const size_t blocksize = 1024;
380
do{
381
if(buf_len + blocksize > buf_allocated){
382
char *tmp = realloc(buf, buf_allocated + blocksize);
383
if(tmp == NULL){
384
perror("realloc");
385
an_error_occured = true;
386
break;
387
}
388
buf = tmp;
389
buf_allocated += blocksize;
267
if(not interrupted_by_signal and not an_error_occured){
268
int fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
269
if(fifo_fd == -1 and not interrupted_by_signal){
270
perror("open");
271
return EXIT_FAILURE;
390
272
}
273
size_t buf_allocated = 0;
274
const int blocksize = 1024;
391
275
do{
276
if(buf_len + blocksize > buf_allocated){
277
char *tmp = realloc(buf, buf_allocated + blocksize);
278
if(tmp == NULL){
279
perror("realloc");
280
an_error_occured = true;
281
break;
282
}
283
buf = tmp;
284
buf_allocated += blocksize;
285
}
392
286
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
393
287
if(sret == -1){
394
if(errno != EINTR){
395
perror("read");
396
an_error_occured = true;
397
break;
398
}
399
if(interrupted_by_signal){
400
break;
401
}
288
perror("read");
289
an_error_occured = true;
290
break;
402
291
}
403
}while(sret == -1);
404
if(interrupted_by_signal or an_error_occured){
405
break;
406
}
407
408
buf_len += (size_t)sret;
409
}while(sret != 0);
410
close(fifo_fd);
411
if(interrupted_by_signal or an_error_occured){
412
break; /* Big */
413
}
414
415
if(not usplash_write("TIMEOUT", "15")
416
and (errno != EINTR)){
417
perror("usplash_write");
418
an_error_occured = true;
419
}
420
if(interrupted_by_signal or an_error_occured){
421
break; /* Big */
422
}
423
292
buf_len += (size_t)sret;
293
}while(not interrupted_by_signal and sret != 0);
294
close(fifo_fd);
295
}
296
424
297
/* Print password to stdout */
425
size_t written = 0;
426
while(written < buf_len){
298
if(not interrupted_by_signal and not an_error_occured){
299
size_t written = 0;
427
300
do{
428
301
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
429
if(sret == -1){
430
if(errno != EINTR){
431
perror("write");
432
an_error_occured = true;
433
break;
434
}
435
if(interrupted_by_signal){
436
break;
437
}
302
if(sret == -1 and not interrupted_by_signal){
303
perror("write");
304
an_error_occured = true;
305
break;
438
306
}
439
}while(sret == -1);
440
if(interrupted_by_signal or an_error_occured){
441
break;
307
written += (size_t)sret;
308
}while(written < buf_len);
309
if(not interrupted_by_signal and not an_error_occured){
310
return EXIT_SUCCESS;
442
311
}
443
written += (size_t)sret;
444
}
445
free(buf);
446
if(not interrupted_by_signal and not an_error_occured){
447
free(cmdline);
448
return EXIT_SUCCESS;
449
}
450
break; /* Big */
451
} /* end of non-loop while() */
452
453
/* If we got here, an error or interrupt must have happened */
454
455
/* Create argc and argv for new usplash*/
312
}
313
}
314
315
kill(usplash_pid, SIGTERM);
316
456
317
int cmdline_argc = 0;
457
318
char **cmdline_argv = malloc(sizeof(char *));
319
/* Create argv and argc for new usplash*/
458
320
{
459
size_t position = 0;
460
while(position < cmdline_len){
321
ptrdiff_t position = 0;
322
while((size_t)position < cmdline_len){
461
323
char **tmp = realloc(cmdline_argv,
462
(sizeof(char *)
463
* (size_t)(cmdline_argc + 2)));
324
(sizeof(char *) * (size_t)(cmdline_argc + 2)));
464
325
if(tmp == NULL){
465
326
perror("realloc");
466
327
free(cmdline_argv);
469
330
cmdline_argv = tmp;
470
331
cmdline_argv[cmdline_argc] = cmdline + position;
471
332
cmdline_argc++;
472
position += strlen(cmdline + position) + 1;
333
position = (char *)rawmemchr(cmdline + position, '\0')
334
- cmdline + 1;
473
335
}
474
336
cmdline_argv[cmdline_argc] = NULL;
475
337
}
476
/* Kill old usplash */
477
kill(usplash_pid, SIGTERM);
478
sleep(2);
479
while(kill(usplash_pid, 0) == 0){
480
kill(usplash_pid, SIGKILL);
481
sleep(1);
482
}
483
338
pid_t new_usplash_pid = fork();
484
339
if(new_usplash_pid == 0){
485
340
/* Child; will become new usplash process */
486
487
/* Make the effective user ID (root) the only user ID instead of
488
the real user ID (mandos) */
489
ret = setuid(geteuid());
490
if(ret == -1){
491
perror("setuid");
341
while(kill(usplash_pid, 0)){
342
sleep(2);
343
kill(usplash_pid, SIGKILL);
344
sleep(1);
492
345
}
493
494
setsid();
495
ret = chdir("/");
496
/* if(fork() != 0){ */
497
/* _exit(EXIT_SUCCESS); */
498
/* } */
499
346
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
500
347
if(ret == -1){
501
348
perror("dup2");
502
349
_exit(EXIT_FAILURE);
503
350
}
504
505
execv(usplash_name, cmdline_argv);
506
if(not interrupted_by_signal){
507
perror("execv");
508
}
509
free(cmdline);
510
free(cmdline_argv);
511
_exit(EXIT_FAILURE);
512
}
513
free(cmdline);
514
free(cmdline_argv);
515
sleep(2);
516
if(not usplash_write("PULSATE", NULL)
517
and (errno != EINTR)){
518
perror("usplash_write");
351
execv("/sbin/usplash", cmdline_argv);
519
352
}
520
353
521
354
return EXIT_FAILURE;
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