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- Committer: Teddy Hogeborn
- Date: 2009-09-08 06:28:20 UTC
- Revision ID: teddy@fukt.bsnet.se-20090908062820-xgkdkrnvuze9vc72
* debian/mandos-client.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
Updated location of nfsroot.txt.
* debian/mandos.README.Debian: Improved wording and formatting.
added
removed
plugins.d/usplash.c
22
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
25
#define _GNU_SOURCE /* asprintf() */
26
26
#include <signal.h> /* sig_atomic_t, struct sigaction,
27
27
sigemptyset(), sigaddset(), SIGINT,
28
28
SIGHUP, SIGTERM, sigaction(),
31
31
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
32
32
#include <iso646.h> /* and, or, not*/
33
33
#include <errno.h> /* errno, EINTR */
34
#include <error.h>
35
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
36
35
dirent */
37
36
#include <stddef.h> /* NULL */
38
37
#include <string.h> /* strlen(), memcmp() */
39
#include <stdio.h> /* asprintf()*/
38
#include <stdio.h> /* asprintf(), perror() */
40
39
#include <unistd.h> /* close(), write(), readlink(),
41
40
read(), STDOUT_FILENO, sleep(),
42
41
fork(), setuid(), geteuid(),
43
42
setsid(), chdir(), dup2(),
44
43
STDERR_FILENO, execv() */
45
44
#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
46
EXIT_SUCCESS, malloc(), _exit(),
47
getenv() */
45
EXIT_SUCCESS, malloc(), _exit() */
46
#include <stdlib.h> /* getenv() */
48
47
#include <dirent.h> /* opendir(), readdir(), closedir() */
49
48
#include <inttypes.h> /* intmax_t, strtoimax() */
50
49
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
52
50
53
51
sig_atomic_t interrupted_by_signal = 0;
54
int signal_received;
55
const char usplash_name[] = "/sbin/usplash";
56
52
57
static void termination_handler(int signum){
58
if(interrupted_by_signal){
59
return;
60
}
53
static void termination_handler(__attribute__((unused))int signum){
61
54
interrupted_by_signal = 1;
62
signal_received = signum;
63
55
}
64
56
65
static bool usplash_write(int *fifo_fd_r,
66
const char *cmd, const char *arg){
57
static bool usplash_write(const char *cmd, const char *arg){
67
58
/*
68
* usplash_write(&fd, "TIMEOUT", "15") will write "TIMEOUT 15\0"
69
* usplash_write(&fd, "PULSATE", NULL) will write "PULSATE\0"
59
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
60
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
70
61
* SEE ALSO
71
62
* usplash_write(8)
72
63
*/
73
64
int ret;
74
if(*fifo_fd_r == -1){
75
ret = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
76
if(ret == -1){
65
int fifo_fd;
66
do {
67
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
68
if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
77
69
return false;
78
70
}
79
*fifo_fd_r = ret;
80
}
71
} while(fifo_fd == -1);
81
72
82
73
const char *cmd_line;
83
74
size_t cmd_line_len;
84
75
char *cmd_line_alloc = NULL;
85
76
if(arg == NULL){
86
77
cmd_line = cmd;
87
cmd_line_len = strlen(cmd) + 1;
78
cmd_line_len = strlen(cmd);
88
79
} else {
89
80
do {
90
81
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
91
if(ret == -1){
82
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
92
83
int e = errno;
93
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
84
close(fifo_fd);
94
85
errno = e;
95
86
return false;
96
87
}
101
92
102
93
size_t written = 0;
103
94
ssize_t sret = 0;
104
while(written < cmd_line_len){
105
sret = write(*fifo_fd_r, cmd_line + written,
95
while(not interrupted_by_signal and written < cmd_line_len){
96
sret = write(fifo_fd, cmd_line + written,
106
97
cmd_line_len - written);
107
98
if(sret == -1){
108
int e = errno;
109
TEMP_FAILURE_RETRY(close(*fifo_fd_r));
110
free(cmd_line_alloc);
111
errno = e;
112
return false;
99
if(errno != EINTR or interrupted_by_signal){
100
int e = errno;
101
close(fifo_fd);
102
free(cmd_line_alloc);
103
errno = e;
104
return false;
105
} else {
106
continue;
107
}
113
108
}
114
109
written += (size_t)sret;
115
110
}
116
111
free(cmd_line_alloc);
117
112
do {
113
ret = close(fifo_fd);
114
if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
115
return false;
116
}
117
} while(ret == -1);
118
if(interrupted_by_signal){
119
return false;
120
}
118
121
return true;
119
122
}
120
123
121
/* Create prompt string */
122
char *makeprompt(void){
123
int ret = 0;
124
char *prompt;
125
const char *const cryptsource = getenv("cryptsource");
126
const char *const crypttarget = getenv("crypttarget");
127
const char prompt_start[] = "Enter passphrase to unlock the disk";
128
129
if(cryptsource == NULL){
130
if(crypttarget == NULL){
131
ret = asprintf(&prompt, "%s: ", prompt_start);
132
} else {
133
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
134
crypttarget);
135
}
136
} else {
137
if(crypttarget == NULL){
138
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
139
} else {
140
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
141
cryptsource, crypttarget);
142
}
143
}
144
if(ret == -1){
145
return NULL;
146
}
147
return prompt;
148
}
149
150
pid_t find_usplash(char **cmdline_r, size_t *cmdline_len_r){
151
int ret = 0;
152
ssize_t sret = 0;
153
char *cmdline = NULL;
154
size_t cmdline_len = 0;
155
DIR *proc_dir = opendir("/proc");
156
if(proc_dir == NULL){
157
error(0, errno, "opendir");
158
return -1;
159
}
160
errno = 0;
161
for(struct dirent *proc_ent = readdir(proc_dir);
162
proc_ent != NULL;
163
proc_ent = readdir(proc_dir)){
164
pid_t pid;
165
{
166
intmax_t tmpmax;
167
char *tmp;
168
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
169
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
170
or tmpmax != (pid_t)tmpmax){
171
/* Not a process */
172
errno = 0;
173
continue;
174
}
175
pid = (pid_t)tmpmax;
176
}
177
/* Find the executable name by doing readlink() on the
178
/proc/<pid>/exe link */
179
char exe_target[sizeof(usplash_name)];
180
{
181
/* create file name string */
182
char *exe_link;
183
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
184
if(ret == -1){
185
error(0, errno, "asprintf");
186
goto fail_find_usplash;
187
}
188
189
/* Check that it refers to a symlink owned by root:root */
190
struct stat exe_stat;
191
ret = lstat(exe_link, &exe_stat);
192
if(ret == -1){
193
if(errno == ENOENT){
194
free(exe_link);
195
continue;
196
}
197
error(0, errno, "lstat");
198
free(exe_link);
199
goto fail_find_usplash;
200
}
201
if(not S_ISLNK(exe_stat.st_mode)
202
or exe_stat.st_uid != 0
203
or exe_stat.st_gid != 0){
204
free(exe_link);
205
continue;
206
}
207
208
sret = readlink(exe_link, exe_target, sizeof(exe_target));
209
free(exe_link);
210
}
211
/* Compare executable name */
212
if((sret != ((ssize_t)sizeof(exe_target)-1))
213
or (memcmp(usplash_name, exe_target,
214
sizeof(exe_target)-1) != 0)){
215
/* Not it */
216
continue;
217
}
218
/* Found usplash */
219
/* Read and save the command line of usplash in "cmdline" */
220
{
221
/* Open /proc/<pid>/cmdline */
222
int cl_fd;
223
{
224
char *cmdline_filename;
225
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
226
proc_ent->d_name);
227
if(ret == -1){
228
error(0, errno, "asprintf");
229
goto fail_find_usplash;
230
}
231
cl_fd = open(cmdline_filename, O_RDONLY);
232
free(cmdline_filename);
233
if(cl_fd == -1){
234
error(0, errno, "open");
235
goto fail_find_usplash;
236
}
237
}
238
size_t cmdline_allocated = 0;
239
char *tmp;
240
const size_t blocksize = 1024;
241
do {
242
/* Allocate more space? */
243
if(cmdline_len + blocksize > cmdline_allocated){
244
tmp = realloc(cmdline, cmdline_allocated + blocksize);
245
if(tmp == NULL){
246
error(0, errno, "realloc");
247
close(cl_fd);
248
goto fail_find_usplash;
249
}
250
cmdline = tmp;
251
cmdline_allocated += blocksize;
252
}
253
/* Read data */
254
sret = read(cl_fd, cmdline + cmdline_len,
255
cmdline_allocated - cmdline_len);
256
if(sret == -1){
257
error(0, errno, "read");
258
close(cl_fd);
259
goto fail_find_usplash;
260
}
261
cmdline_len += (size_t)sret;
262
} while(sret != 0);
263
ret = close(cl_fd);
264
if(ret == -1){
265
error(0, errno, "close");
266
goto fail_find_usplash;
267
}
268
}
269
/* Close directory */
270
ret = closedir(proc_dir);
271
if(ret == -1){
272
error(0, errno, "closedir");
273
goto fail_find_usplash;
274
}
275
/* Success */
276
*cmdline_r = cmdline;
277
*cmdline_len_r = cmdline_len;
278
return pid;
279
}
280
281
fail_find_usplash:
282
283
free(cmdline);
284
if(proc_dir != NULL){
285
int e = errno;
286
closedir(proc_dir);
287
errno = e;
288
}
289
return 0;
290
}
291
292
124
int main(__attribute__((unused))int argc,
293
125
__attribute__((unused))char **argv){
294
126
int ret = 0;
295
127
ssize_t sret;
296
int fifo_fd = -1;
297
int outfifo_fd = -1;
298
char *buf = NULL;
299
size_t buf_len = 0;
300
pid_t usplash_pid = -1;
301
bool usplash_accessed = false;
302
int status = EXIT_FAILURE; /* Default failure exit status */
128
bool an_error_occured = false;
303
129
304
char *prompt = makeprompt();
305
if(prompt == NULL){
306
status = EX_OSERR;
307
goto failure;
130
/* Create prompt string */
131
char *prompt = NULL;
132
{
133
const char *const cryptsource = getenv("cryptsource");
134
const char *const crypttarget = getenv("crypttarget");
135
const char prompt_start[] = "Enter passphrase to unlock the disk";
136
137
if(cryptsource == NULL){
138
if(crypttarget == NULL){
139
ret = asprintf(&prompt, "%s: ", prompt_start);
140
} else {
141
ret = asprintf(&prompt, "%s (%s): ", prompt_start,
142
crypttarget);
143
}
144
} else {
145
if(crypttarget == NULL){
146
ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
147
} else {
148
ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
149
cryptsource, crypttarget);
150
}
151
}
152
if(ret == -1){
153
return EXIT_FAILURE;
154
}
308
155
}
309
156
310
157
/* Find usplash process */
158
pid_t usplash_pid = 0;
311
159
char *cmdline = NULL;
312
160
size_t cmdline_len = 0;
313
usplash_pid = find_usplash(&cmdline, &cmdline_len);
161
const char usplash_name[] = "/sbin/usplash";
162
{
163
DIR *proc_dir = opendir("/proc");
164
if(proc_dir == NULL){
165
free(prompt);
166
perror("opendir");
167
return EXIT_FAILURE;
168
}
169
for(struct dirent *proc_ent = readdir(proc_dir);
170
proc_ent != NULL;
171
proc_ent = readdir(proc_dir)){
172
pid_t pid;
173
{
174
intmax_t tmpmax;
175
char *tmp;
176
errno = 0;
177
tmpmax = strtoimax(proc_ent->d_name, &tmp, 10);
178
if(errno != 0 or tmp == proc_ent->d_name or *tmp != '\0'
179
or tmpmax != (pid_t)tmpmax){
180
/* Not a process */
181
continue;
182
}
183
pid = (pid_t)tmpmax;
184
}
185
/* Find the executable name by doing readlink() on the
186
/proc/<pid>/exe link */
187
char exe_target[sizeof(usplash_name)];
188
{
189
/* create file name string */
190
char *exe_link;
191
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
192
if(ret == -1){
193
perror("asprintf");
194
free(prompt);
195
closedir(proc_dir);
196
return EXIT_FAILURE;
197
}
198
199
/* Check that it refers to a symlink owned by root:root */
200
struct stat exe_stat;
201
ret = lstat(exe_link, &exe_stat);
202
if(ret == -1){
203
if(errno == ENOENT){
204
free(exe_link);
205
continue;
206
}
207
perror("lstat");
208
free(exe_link);
209
free(prompt);
210
closedir(proc_dir);
211
return EXIT_FAILURE;
212
}
213
if(not S_ISLNK(exe_stat.st_mode)
214
or exe_stat.st_uid != 0
215
or exe_stat.st_gid != 0){
216
free(exe_link);
217
continue;
218
}
219
220
sret = readlink(exe_link, exe_target, sizeof(exe_target));
221
free(exe_link);
222
}
223
if((sret == ((ssize_t)sizeof(exe_target)-1))
224
and (memcmp(usplash_name, exe_target,
225
sizeof(exe_target)-1) == 0)){
226
usplash_pid = pid;
227
/* Read and save the command line of usplash in "cmdline" */
228
{
229
/* Open /proc/<pid>/cmdline */
230
int cl_fd;
231
{
232
char *cmdline_filename;
233
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
234
proc_ent->d_name);
235
if(ret == -1){
236
perror("asprintf");
237
free(prompt);
238
closedir(proc_dir);
239
return EXIT_FAILURE;
240
}
241
cl_fd = open(cmdline_filename, O_RDONLY);
242
if(cl_fd == -1){
243
perror("open");
244
free(cmdline_filename);
245
free(prompt);
246
closedir(proc_dir);
247
return EXIT_FAILURE;
248
}
249
free(cmdline_filename);
250
}
251
size_t cmdline_allocated = 0;
252
char *tmp;
253
const size_t blocksize = 1024;
254
do {
255
if(cmdline_len + blocksize > cmdline_allocated){
256
tmp = realloc(cmdline, cmdline_allocated + blocksize);
257
if(tmp == NULL){
258
perror("realloc");
259
free(cmdline);
260
free(prompt);
261
closedir(proc_dir);
262
return EXIT_FAILURE;
263
}
264
cmdline = tmp;
265
cmdline_allocated += blocksize;
266
}
267
sret = read(cl_fd, cmdline + cmdline_len,
268
cmdline_allocated - cmdline_len);
269
if(sret == -1){
270
perror("read");
271
free(cmdline);
272
free(prompt);
273
closedir(proc_dir);
274
return EXIT_FAILURE;
275
}
276
cmdline_len += (size_t)sret;
277
} while(sret != 0);
278
close(cl_fd);
279
}
280
break;
281
}
282
}
283
closedir(proc_dir);
284
}
314
285
if(usplash_pid == 0){
315
status = EX_UNAVAILABLE;
316
goto failure;
286
free(prompt);
287
return EXIT_FAILURE;
317
288
}
318
289
319
290
/* Set up the signal handler */
322
293
new_action = { .sa_handler = termination_handler,
323
294
.sa_flags = 0 };
324
295
sigemptyset(&new_action.sa_mask);
325
ret = sigaddset(&new_action.sa_mask, SIGINT);
326
if(ret == -1){
327
error(0, errno, "sigaddset");
328
status = EX_OSERR;
329
goto failure;
330
}
331
ret = sigaddset(&new_action.sa_mask, SIGHUP);
332
if(ret == -1){
333
error(0, errno, "sigaddset");
334
status = EX_OSERR;
335
goto failure;
336
}
337
ret = sigaddset(&new_action.sa_mask, SIGTERM);
338
if(ret == -1){
339
error(0, errno, "sigaddset");
340
status = EX_OSERR;
341
goto failure;
342
}
296
sigaddset(&new_action.sa_mask, SIGINT);
297
sigaddset(&new_action.sa_mask, SIGHUP);
298
sigaddset(&new_action.sa_mask, SIGTERM);
343
299
ret = sigaction(SIGINT, NULL, &old_action);
344
300
if(ret == -1){
345
if(errno != EINTR){
346
error(0, errno, "sigaction");
347
status = EX_OSERR;
348
}
349
goto failure;
301
perror("sigaction");
302
free(prompt);
303
return EXIT_FAILURE;
350
304
}
351
305
if(old_action.sa_handler != SIG_IGN){
352
306
ret = sigaction(SIGINT, &new_action, NULL);
353
307
if(ret == -1){
354
if(errno != EINTR){
355
error(0, errno, "sigaction");
356
status = EX_OSERR;
357
}
358
goto failure;
308
perror("sigaction");
309
free(prompt);
310
return EXIT_FAILURE;
359
311
}
360
312
}
361
313
ret = sigaction(SIGHUP, NULL, &old_action);
362
314
if(ret == -1){
363
if(errno != EINTR){
364
error(0, errno, "sigaction");
365
status = EX_OSERR;
366
}
367
goto failure;
315
perror("sigaction");
316
free(prompt);
317
return EXIT_FAILURE;
368
318
}
369
319
if(old_action.sa_handler != SIG_IGN){
370
320
ret = sigaction(SIGHUP, &new_action, NULL);
371
321
if(ret == -1){
372
if(errno != EINTR){
373
error(0, errno, "sigaction");
374
status = EX_OSERR;
375
}
376
goto failure;
322
perror("sigaction");
323
free(prompt);
324
return EXIT_FAILURE;
377
325
}
378
326
}
379
327
ret = sigaction(SIGTERM, NULL, &old_action);
380
328
if(ret == -1){
381
if(errno != EINTR){
382
error(0, errno, "sigaction");
383
status = EX_OSERR;
384
}
385
goto failure;
329
perror("sigaction");
330
free(prompt);
331
return EXIT_FAILURE;
386
332
}
387
333
if(old_action.sa_handler != SIG_IGN){
388
334
ret = sigaction(SIGTERM, &new_action, NULL);
389
335
if(ret == -1){
390
if(errno != EINTR){
391
error(0, errno, "sigaction");
392
status = EX_OSERR;
393
}
394
goto failure;
336
perror("sigaction");
337
free(prompt);
338
return EXIT_FAILURE;
395
339
}
396
340
}
397
341
}
398
342
399
usplash_accessed = true;
400
343
/* Write command to FIFO */
401
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
402
if(errno != EINTR){
403
error(0, errno, "usplash_write");
404
status = EX_OSERR;
405
}
406
goto failure;
407
}
408
409
if(interrupted_by_signal){
410
goto failure;
411
}
412
413
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
414
if(errno != EINTR){
415
error(0, errno, "usplash_write");
416
status = EX_OSERR;
417
}
418
goto failure;
419
}
420
421
if(interrupted_by_signal){
422
goto failure;
423
}
424
425
free(prompt);
426
prompt = NULL;
427
428
/* Read reply from usplash */
429
/* Open FIFO */
430
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
431
if(outfifo_fd == -1){
432
if(errno != EINTR){
433
error(0, errno, "open");
434
status = EX_OSERR;
435
}
436
goto failure;
437
}
438
439
if(interrupted_by_signal){
440
goto failure;
441
}
442
443
/* Read from FIFO */
444
size_t buf_allocated = 0;
445
const size_t blocksize = 1024;
446
do {
447
/* Allocate more space */
448
if(buf_len + blocksize > buf_allocated){
449
char *tmp = realloc(buf, buf_allocated + blocksize);
450
if(tmp == NULL){
451
if(errno != EINTR){
452
error(0, errno, "realloc");
453
status = EX_OSERR;
454
}
455
goto failure;
456
}
457
buf = tmp;
458
buf_allocated += blocksize;
459
}
460
sret = read(outfifo_fd, buf + buf_len,
461
buf_allocated - buf_len);
462
if(sret == -1){
463
if(errno != EINTR){
464
error(0, errno, "read");
465
status = EX_OSERR;
466
}
467
TEMP_FAILURE_RETRY(close(outfifo_fd));
468
goto failure;
469
}
470
if(interrupted_by_signal){
471
break;
472
}
473
474
buf_len += (size_t)sret;
475
} while(sret != 0);
476
ret = close(outfifo_fd);
477
if(ret == -1){
478
if(errno != EINTR){
479
error(0, errno, "close");
480
status = EX_OSERR;
481
}
482
goto failure;
483
}
484
outfifo_fd = -1;
485
486
if(interrupted_by_signal){
487
goto failure;
488
}
489
490
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
491
if(errno != EINTR){
492
error(0, errno, "usplash_write");
493
status = EX_OSERR;
494
}
495
goto failure;
496
}
497
498
if(interrupted_by_signal){
499
goto failure;
500
}
501
502
ret = close(fifo_fd);
503
if(ret == -1){
504
if(errno != EINTR){
505
error(0, errno, "close");
506
status = EX_OSERR;
507
}
508
goto failure;
509
}
510
fifo_fd = -1;
511
512
/* Print password to stdout */
513
size_t written = 0;
514
while(written < buf_len){
515
do {
516
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
517
if(sret == -1){
518
if(errno != EINTR){
519
error(0, errno, "write");
520
status = EX_OSERR;
521
}
522
goto failure;
523
}
524
} while(sret == -1);
525
526
if(interrupted_by_signal){
527
goto failure;
528
}
529
written += (size_t)sret;
530
}
531
free(buf);
532
buf = NULL;
533
534
if(interrupted_by_signal){
535
goto failure;
536
}
537
538
free(cmdline);
539
return EXIT_SUCCESS;
540
541
failure:
542
543
free(buf);
544
545
free(prompt);
546
547
/* If usplash was never accessed, we can stop now */
548
if(not usplash_accessed){
549
return status;
550
}
551
552
/* Close FIFO */
553
if(fifo_fd != -1){
554
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
555
if(ret == -1 and errno != EINTR){
556
error(0, errno, "close");
557
}
558
fifo_fd = -1;
559
}
560
561
/* Close output FIFO */
562
if(outfifo_fd != -1){
563
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
564
if(ret == -1){
565
error(0, errno, "close");
566
}
567
}
344
if(not interrupted_by_signal){
345
if(not usplash_write("TIMEOUT", "0")
346
and (errno != EINTR)){
347
perror("usplash_write");
348
an_error_occured = true;
349
}
350
}
351
if(not interrupted_by_signal and not an_error_occured){
352
if(not usplash_write("INPUTQUIET", prompt)
353
and (errno != EINTR)){
354
perror("usplash_write");
355
an_error_occured = true;
356
}
357
}
358
free(prompt);
359
360
/* This is not really a loop; while() is used to be able to "break"
361
out of it; those breaks are marked "Big" */
362
while(not interrupted_by_signal and not an_error_occured){
363
char *buf = NULL;
364
size_t buf_len = 0;
365
366
/* Open FIFO */
367
int fifo_fd;
368
do {
369
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
370
if(fifo_fd == -1){
371
if(errno != EINTR){
372
perror("open");
373
an_error_occured = true;
374
break;
375
}
376
if(interrupted_by_signal){
377
break;
378
}
379
}
380
} while(fifo_fd == -1);
381
if(interrupted_by_signal or an_error_occured){
382
break; /* Big */
383
}
384
385
/* Read from FIFO */
386
size_t buf_allocated = 0;
387
const size_t blocksize = 1024;
388
do {
389
if(buf_len + blocksize > buf_allocated){
390
char *tmp = realloc(buf, buf_allocated + blocksize);
391
if(tmp == NULL){
392
perror("realloc");
393
an_error_occured = true;
394
break;
395
}
396
buf = tmp;
397
buf_allocated += blocksize;
398
}
399
do {
400
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
401
if(sret == -1){
402
if(errno != EINTR){
403
perror("read");
404
an_error_occured = true;
405
break;
406
}
407
if(interrupted_by_signal){
408
break;
409
}
410
}
411
} while(sret == -1);
412
if(interrupted_by_signal or an_error_occured){
413
break;
414
}
415
416
buf_len += (size_t)sret;
417
} while(sret != 0);
418
close(fifo_fd);
419
if(interrupted_by_signal or an_error_occured){
420
break; /* Big */
421
}
422
423
if(not usplash_write("TIMEOUT", "15")
424
and (errno != EINTR)){
425
perror("usplash_write");
426
an_error_occured = true;
427
}
428
if(interrupted_by_signal or an_error_occured){
429
break; /* Big */
430
}
431
432
/* Print password to stdout */
433
size_t written = 0;
434
while(written < buf_len){
435
do {
436
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
437
if(sret == -1){
438
if(errno != EINTR){
439
perror("write");
440
an_error_occured = true;
441
break;
442
}
443
if(interrupted_by_signal){
444
break;
445
}
446
}
447
} while(sret == -1);
448
if(interrupted_by_signal or an_error_occured){
449
break;
450
}
451
written += (size_t)sret;
452
}
453
free(buf);
454
if(not interrupted_by_signal and not an_error_occured){
455
free(cmdline);
456
return EXIT_SUCCESS;
457
}
458
break; /* Big */
459
} /* end of non-loop while() */
460
461
/* If we got here, an error or interrupt must have happened */
568
462
569
463
/* Create argc and argv for new usplash*/
570
464
int cmdline_argc = 0;
576
470
(sizeof(char *)
577
471
* (size_t)(cmdline_argc + 2)));
578
472
if(tmp == NULL){
579
error(0, errno, "realloc");
473
perror("realloc");
580
474
free(cmdline_argv);
581
return status;
475
return EXIT_FAILURE;
582
476
}
583
477
cmdline_argv = tmp;
584
478
cmdline_argv[cmdline_argc] = cmdline + position;
594
488
kill(usplash_pid, SIGKILL);
595
489
sleep(1);
596
490
}
597
598
491
pid_t new_usplash_pid = fork();
599
492
if(new_usplash_pid == 0){
600
493
/* Child; will become new usplash process */
603
496
the real user ID (_mandos) */
604
497
ret = setuid(geteuid());
605
498
if(ret == -1){
606
error(0, errno, "setuid");
499
perror("setuid");
607
500
}
608
501
609
502
setsid();
610
503
ret = chdir("/");
611
if(ret == -1){
612
error(0, errno, "chdir");
613
_exit(EX_OSERR);
614
}
615
504
/* if(fork() != 0){ */
616
505
/* _exit(EXIT_SUCCESS); */
617
506
/* } */
618
507
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
619
508
if(ret == -1){
620
error(0, errno, "dup2");
621
_exit(EX_OSERR);
509
perror("dup2");
510
_exit(EXIT_FAILURE);
622
511
}
623
512
624
513
execv(usplash_name, cmdline_argv);
625
514
if(not interrupted_by_signal){
626
error(0, errno, "execv");
515
perror("execv");
627
516
}
628
517
free(cmdline);
629
518
free(cmdline_argv);
630
_exit(EX_OSERR);
519
_exit(EXIT_FAILURE);
631
520
}
632
521
free(cmdline);
633
522
free(cmdline_argv);
634
523
sleep(2);
635
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
636
if(errno != EINTR){
637
error(0, errno, "usplash_write");
638
}
639
}
640
641
/* Close FIFO (again) */
642
if(fifo_fd != -1){
643
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
644
if(ret == -1 and errno != EINTR){
645
error(0, errno, "close");
646
}
647
fifo_fd = -1;
648
}
649
650
if(interrupted_by_signal){
651
struct sigaction signal_action = { .sa_handler = SIG_DFL };
652
sigemptyset(&signal_action.sa_mask);
653
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
654
&signal_action, NULL));
655
if(ret == -1){
656
error(0, errno, "sigaction");
657
}
658
do {
659
ret = raise(signal_received);
660
} while(ret != 0 and errno == EINTR);
661
if(ret != 0){
662
error(0, errno, "raise");
663
abort();
664
}
665
TEMP_FAILURE_RETRY(pause());
666
}
667
668
return status;
524
if(not usplash_write("PULSATE", NULL)
525
and (errno != EINTR)){
526
perror("usplash_write");
527
}
528
529
return EXIT_FAILURE;
669
530
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0