3
3
* Usplash - Read a password from usplash and output it
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
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 */
35
34
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
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(),
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
50
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
52
#include <argz.h> /* argz_count(), argz_extract() */
54
52
sig_atomic_t interrupted_by_signal = 0;
55
53
int signal_received;
226
224
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
227
225
proc_ent->d_name);
229
error(0, errno, "asprintf");
230
228
goto fail_find_usplash;
232
230
cl_fd = open(cmdline_filename, O_RDONLY);
233
231
free(cmdline_filename);
235
error(0, errno, "open");
236
234
goto fail_find_usplash;
325
323
sigemptyset(&new_action.sa_mask);
326
324
ret = sigaddset(&new_action.sa_mask, SIGINT);
328
error(0, errno, "sigaddset");
329
327
status = EX_OSERR;
332
330
ret = sigaddset(&new_action.sa_mask, SIGHUP);
334
error(0, errno, "sigaddset");
335
333
status = EX_OSERR;
338
336
ret = sigaddset(&new_action.sa_mask, SIGTERM);
340
error(0, errno, "sigaddset");
341
339
status = EX_OSERR;
344
342
ret = sigaction(SIGINT, NULL, &old_action);
346
344
if(errno != EINTR){
347
error(0, errno, "sigaction");
348
346
status = EX_OSERR;
401
399
/* Write command to FIFO */
402
400
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
403
401
if(errno != EINTR){
404
error(0, errno, "usplash_write");
402
perror("usplash_write");
405
403
status = EX_OSERR;
563
561
if(outfifo_fd != -1){
564
562
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
566
error(0, errno, "close");
570
/* Create argv for new usplash*/
571
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
572
* sizeof(char *)); /* Count args */
573
if(cmdline_argv == NULL){
574
error(0, errno, "malloc");
577
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
568
/* Create argc and argv for new usplash*/
569
int cmdline_argc = 0;
570
char **cmdline_argv = malloc(sizeof(char *));
573
while(position < cmdline_len){
574
char **tmp = realloc(cmdline_argv,
576
* (size_t)(cmdline_argc + 2)));
583
cmdline_argv[cmdline_argc] = cmdline + position;
585
position += strlen(cmdline + position) + 1;
587
cmdline_argv[cmdline_argc] = NULL;
579
589
/* Kill old usplash */
580
590
kill(usplash_pid, SIGTERM);
592
602
the real user ID (_mandos) */
593
603
ret = setuid(geteuid());
595
error(0, errno, "setuid");
599
609
ret = chdir("/");
601
error(0, errno, "chdir");
604
610
/* if(fork() != 0){ */
605
611
/* _exit(EXIT_SUCCESS); */
607
613
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
609
error(0, errno, "dup2");
613
619
execv(usplash_name, cmdline_argv);
614
620
if(not interrupted_by_signal){
615
error(0, errno, "execv");
618
624
free(cmdline_argv);
642
648
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
643
649
&signal_action, NULL));
645
error(0, errno, "sigaction");
648
654
ret = raise(signal_received);
649
655
} while(ret != 0 and errno == EINTR);
651
error(0, errno, "raise");
654
660
TEMP_FAILURE_RETRY(pause());