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- Committer: Teddy Hogeborn
- Date: 2008-09-24 23:12:49 UTC
- Revision ID: teddy@fukt.bsnet.se-20080924231249-0xhjl5ydrbcjvce7
* debian/mandos-client.lintian-overrides: Ignore setuid
"plugins.d/usplash".
"plugins.d/usplash".
- files removed:
- common.ent
- files modified:
- .bzrignore
added
removed
plugins.d/usplash.c
1
1
#define _GNU_SOURCE /* asprintf() */
2
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
3
sigemptyset(), sigaddset(), SIGINT,
4
SIGHUP, SIGTERM, sigaction(),
5
SIG_IGN, kill(), SIGKILL */
6
#include <stdbool.h> /* bool, false, true */
7
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
8
#include <errno.h> /* errno, EINTR */
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR,
10
struct dirent */
3
sigemptyset(), sigaddset(),
4
sigaction, SIGINT, SIG_IGN, SIGHUP,
5
SIGTERM, kill(), SIGKILL */
11
6
#include <stddef.h> /* NULL */
12
#include <string.h> /* strlen(), memcmp() */
7
#include <stdlib.h> /* getenv() */
13
8
#include <stdio.h> /* asprintf(), perror() */
14
#include <unistd.h> /* close(), write(), readlink(),
15
read(), STDOUT_FILENO, sleep(),
16
fork(), setuid(), geteuid(),
17
setsid(), chdir(), dup2(),
18
STDERR_FILENO, execv() */
19
#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
20
realloc(), EXIT_SUCCESS, malloc(),
21
_exit() */
22
#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 */
23
13
#include <dirent.h> /* opendir(), readdir(), closedir() */
24
25
26
14
#include <unistd.h> /* readlink(), fork(), execl(),
15
_exit */
16
#include <string.h> /* memcmp() */
27
17
#include <iso646.h> /* and */
18
#include <stdbool.h> /* bool, false, true */
19
#include <errno.h> /* errno */
28
20
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
29
21
WEXITSTATUS() */
22
#include <fcntl.h> /* open(), O_RDONLY */
30
23
31
24
sig_atomic_t interrupted_by_signal = 0;
32
25
34
27
interrupted_by_signal = 1;
35
28
}
36
29
37
static bool usplash_write(const char *cmd, const char *arg){
38
/*
39
* usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
40
* usplash_write("PULSATE", NULL); -> "PULSATE\0"
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* SEE ALSO
42
* usplash_write(8)
43
*/
44
int ret;
45
int fifo_fd;
46
do{
47
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
48
if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
49
return false;
50
}
51
}while(fifo_fd == -1);
52
53
const char *cmd_line;
54
size_t cmd_line_len;
55
char *cmd_line_alloc = NULL;
56
if(arg == NULL){
57
cmd_line = cmd;
58
cmd_line_len = strlen(cmd);
59
}else{
60
do{
61
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
62
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
63
int e = errno;
64
close(fifo_fd);
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errno = e;
66
return false;
67
}
68
}while(ret == -1);
69
cmd_line = cmd_line_alloc;
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cmd_line_len = (size_t)ret + 1;
71
}
72
73
size_t written = 0;
74
while(not interrupted_by_signal and written < cmd_line_len){
75
ret = write(fifo_fd, cmd_line + written,
76
cmd_line_len - written);
77
if(ret == -1){
78
if(errno != EINTR or interrupted_by_signal){
79
int e = errno;
80
close(fifo_fd);
81
free(cmd_line_alloc);
82
errno = e;
83
return false;
84
} else {
85
continue;
86
}
87
}
88
written += (size_t)ret;
89
}
90
free(cmd_line_alloc);
91
do{
92
ret = close(fifo_fd);
93
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
94
return false;
95
}
96
}while(ret == -1);
97
if(interrupted_by_signal){
98
return false;
99
}
100
return true;
101
}
102
103
30
int main(__attribute__((unused))int argc,
104
31
__attribute__((unused))char **argv){
105
32
int ret = 0;
111
38
{
112
39
const char *const cryptsource = getenv("cryptsource");
113
40
const char *const crypttarget = getenv("crypttarget");
114
const char prompt_start[] = "Enter passphrase to unlock the disk";
41
const char *const prompt_start = "Enter passphrase to unlock the disk";
115
42
116
43
if(cryptsource == NULL){
117
44
if(crypttarget == NULL){
137
64
pid_t usplash_pid = 0;
138
65
char *cmdline = NULL;
139
66
size_t cmdline_len = 0;
140
const char usplash_name[] = "/sbin/usplash";
141
67
{
68
const char usplash_name[] = "/sbin/usplash";
142
69
DIR *proc_dir = opendir("/proc");
143
70
if(proc_dir == NULL){
144
71
free(prompt);
167
94
}
168
95
sret = readlink(exe_link, exe_target, sizeof(exe_target));
169
96
free(exe_link);
170
if(sret == -1){
171
continue;
172
}
173
97
}
174
98
if((sret == ((ssize_t)sizeof(exe_target)-1))
175
99
and (memcmp(usplash_name, exe_target,
293
217
294
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/* Write command to FIFO */
295
219
if(not interrupted_by_signal){
296
if(not usplash_write("TIMEOUT", "0")
297
and (errno != EINTR)){
298
perror("usplash_write");
299
an_error_occured = true;
300
}
301
}
302
if(not interrupted_by_signal and not an_error_occured){
303
if(not usplash_write("INPUTQUIET", prompt)
304
and (errno != EINTR)){
305
perror("usplash_write");
306
an_error_occured = true;
307
}
308
}
309
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
}
310
261
311
/* This is not really a loop; while() is used to be able to "break"
312
out of it; those breaks are marked "Big" */
313
while(not interrupted_by_signal and not an_error_occured){
262
{
314
263
char *buf = NULL;
315
264
size_t buf_len = 0;
316
265
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/* Open FIFO */
318
int fifo_fd;
319
do{
320
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
321
if(fifo_fd == -1){
322
if(errno != EINTR){
323
perror("open");
324
an_error_occured = true;
325
break;
326
}
327
if(interrupted_by_signal){
328
break;
329
}
330
}
331
}while(fifo_fd == -1);
332
if(interrupted_by_signal or an_error_occured){
333
break; /* Big */
334
}
335
336
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/* Read from FIFO */
337
size_t buf_allocated = 0;
338
const size_t blocksize = 1024;
339
do{
340
if(buf_len + blocksize > buf_allocated){
341
char *tmp = realloc(buf, buf_allocated + blocksize);
342
if(tmp == NULL){
343
perror("realloc");
344
an_error_occured = true;
345
break;
346
}
347
buf = tmp;
348
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;
349
272
}
273
size_t buf_allocated = 0;
274
const int blocksize = 1024;
350
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
}
351
286
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
352
287
if(sret == -1){
353
if(errno != EINTR){
354
perror("read");
355
an_error_occured = true;
356
break;
357
}
358
if(interrupted_by_signal){
359
break;
360
}
288
perror("read");
289
an_error_occured = true;
290
break;
361
291
}
362
}while(sret == -1);
363
if(interrupted_by_signal or an_error_occured){
364
break;
365
}
366
367
buf_len += (size_t)sret;
368
}while(sret != 0);
369
close(fifo_fd);
370
if(interrupted_by_signal or an_error_occured){
371
break; /* Big */
372
}
373
374
if(not usplash_write("TIMEOUT", "15")
375
and (errno != EINTR)){
376
perror("usplash_write");
377
an_error_occured = true;
378
}
379
if(interrupted_by_signal or an_error_occured){
380
break; /* Big */
381
}
382
292
buf_len += (size_t)sret;
293
}while(not interrupted_by_signal and sret != 0);
294
close(fifo_fd);
295
}
296
383
297
/* Print password to stdout */
384
size_t written = 0;
385
while(written < buf_len){
298
if(not interrupted_by_signal and not an_error_occured){
299
size_t written = 0;
386
300
do{
387
301
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
388
if(sret == -1){
389
if(errno != EINTR){
390
perror("write");
391
an_error_occured = true;
392
break;
393
}
394
if(interrupted_by_signal){
395
break;
396
}
302
if(sret == -1 and not interrupted_by_signal){
303
perror("write");
304
an_error_occured = true;
305
break;
397
306
}
398
}while(sret == -1);
399
if(interrupted_by_signal or an_error_occured){
400
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;
401
311
}
402
written += (size_t)sret;
403
}
404
free(buf);
405
if(not interrupted_by_signal and not an_error_occured){
406
free(cmdline);
407
return EXIT_SUCCESS;
408
}
409
break; /* Big */
312
}
410
313
}
411
314
412
/* If we got here, an error or interrupt must have happened */
315
kill(usplash_pid, SIGTERM);
413
316
414
317
int cmdline_argc = 0;
415
318
char **cmdline_argv = malloc(sizeof(char *));
416
319
/* Create argv and argc for new usplash*/
417
320
{
418
size_t position = 0;
419
while(position < cmdline_len){
321
ptrdiff_t position = 0;
322
while((size_t)position < cmdline_len){
420
323
char **tmp = realloc(cmdline_argv,
421
(sizeof(char *)
422
* (size_t)(cmdline_argc + 2)));
324
(sizeof(char *) * (size_t)(cmdline_argc + 2)));
423
325
if(tmp == NULL){
424
326
perror("realloc");
425
327
free(cmdline_argv);
428
330
cmdline_argv = tmp;
429
331
cmdline_argv[cmdline_argc] = cmdline + position;
430
332
cmdline_argc++;
431
position += strlen(cmdline + position) + 1;
333
position = (char *)rawmemchr(cmdline + position, '\0')
334
- cmdline + 1;
432
335
}
433
336
cmdline_argv[cmdline_argc] = NULL;
434
337
}
435
/* Kill old usplash */
436
kill(usplash_pid, SIGTERM);
437
sleep(2);
438
while(kill(usplash_pid, 0) == 0){
439
kill(usplash_pid, SIGKILL);
440
sleep(1);
441
}
442
338
pid_t new_usplash_pid = fork();
443
339
if(new_usplash_pid == 0){
444
340
/* Child; will become new usplash process */
445
446
/* Make the effective user ID (root) the only user ID instead of
447
the real user ID (mandos) */
448
ret = setuid(geteuid());
449
if (ret == -1){
450
perror("setuid");
341
while(kill(usplash_pid, 0)){
342
sleep(2);
343
kill(usplash_pid, SIGKILL);
344
sleep(1);
451
345
}
452
453
setsid();
454
ret = chdir("/");
455
/* if(fork() != 0){ */
456
/* _exit(EXIT_SUCCESS); */
457
/* } */
458
346
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
459
347
if(ret == -1){
460
348
perror("dup2");
461
349
_exit(EXIT_FAILURE);
462
350
}
463
464
execv(usplash_name, cmdline_argv);
465
perror("execv");
466
free(cmdline);
467
free(cmdline_argv);
468
_exit(EXIT_FAILURE);
469
}
470
free(cmdline);
471
free(cmdline_argv);
472
sleep(2);
473
if(not usplash_write("PULSATE", NULL)
474
and (errno != EINTR)){
475
perror("usplash_write");
351
execv("/sbin/usplash", cmdline_argv);
476
352
}
477
353
478
354
return EXIT_FAILURE;
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