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- Committer: Teddy Hogeborn
- Date: 2009-12-26 01:19:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20091226011947-qapwzqvwxl5r565s
* mandos-ctl (defaultkeywords): Removed "checker".
added
removed
plugins.d/usplash.c
2
2
/*
3
3
* Usplash - Read a password from usplash and output it
4
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
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7
*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
31
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#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(),
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read(), STDOUT_FILENO, sleep(),
42
41
fork(), setuid(), geteuid(),
43
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setsid(), chdir(), dup2(),
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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() */
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#include <inttypes.h> /* intmax_t, strtoimax() */
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#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
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#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
52
#include <argz.h> /* argz_count(), argz_extract() */
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51
54
52
sig_atomic_t interrupted_by_signal = 0;
55
53
int signal_received;
155
153
size_t cmdline_len = 0;
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154
DIR *proc_dir = opendir("/proc");
157
155
if(proc_dir == NULL){
158
error(0, errno, "opendir");
156
perror("opendir");
159
157
return -1;
160
158
}
161
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errno = 0;
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181
char *exe_link;
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ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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183
if(ret == -1){
186
error(0, errno, "asprintf");
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perror("asprintf");
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goto fail_find_usplash;
188
186
}
189
187
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free(exe_link);
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continue;
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195
}
198
error(0, errno, "lstat");
196
perror("lstat");
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free(exe_link);
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goto fail_find_usplash;
201
199
}
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ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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proc_ent->d_name);
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if(ret == -1){
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error(0, errno, "asprintf");
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perror("asprintf");
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228
goto fail_find_usplash;
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229
}
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cl_fd = open(cmdline_filename, O_RDONLY);
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free(cmdline_filename);
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if(cl_fd == -1){
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error(0, errno, "open");
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perror("open");
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goto fail_find_usplash;
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}
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}
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if(cmdline_len + blocksize > cmdline_allocated){
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tmp = realloc(cmdline, cmdline_allocated + blocksize);
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if(tmp == NULL){
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error(0, errno, "realloc");
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perror("realloc");
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close(cl_fd);
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goto fail_find_usplash;
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}
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sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
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if(sret == -1){
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error(0, errno, "read");
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perror("read");
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close(cl_fd);
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goto fail_find_usplash;
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}
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} while(sret != 0);
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ret = close(cl_fd);
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if(ret == -1){
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error(0, errno, "close");
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perror("close");
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goto fail_find_usplash;
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}
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}
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/* Close directory */
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ret = closedir(proc_dir);
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if(ret == -1){
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error(0, errno, "closedir");
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perror("closedir");
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goto fail_find_usplash;
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}
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/* Success */
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sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
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if(ret == -1){
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error(0, errno, "sigaddset");
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perror("sigaddset");
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status = EX_OSERR;
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goto failure;
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}
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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if(ret == -1){
334
error(0, errno, "sigaddset");
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perror("sigaddset");
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status = EX_OSERR;
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goto failure;
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335
}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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if(ret == -1){
340
error(0, errno, "sigaddset");
338
perror("sigaddset");
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status = EX_OSERR;
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goto failure;
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}
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ret = sigaction(SIGINT, NULL, &old_action);
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if(ret == -1){
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if(errno != EINTR){
347
error(0, errno, "sigaction");
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perror("sigaction");
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status = EX_OSERR;
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}
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goto failure;
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ret = sigaction(SIGINT, &new_action, NULL);
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if(ret == -1){
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if(errno != EINTR){
356
error(0, errno, "sigaction");
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perror("sigaction");
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status = EX_OSERR;
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}
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goto failure;
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ret = sigaction(SIGHUP, NULL, &old_action);
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if(ret == -1){
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if(errno != EINTR){
365
error(0, errno, "sigaction");
363
perror("sigaction");
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status = EX_OSERR;
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365
}
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goto failure;
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ret = sigaction(SIGHUP, &new_action, NULL);
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if(ret == -1){
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if(errno != EINTR){
374
error(0, errno, "sigaction");
372
perror("sigaction");
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status = EX_OSERR;
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}
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goto failure;
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ret = sigaction(SIGTERM, NULL, &old_action);
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379
if(ret == -1){
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if(errno != EINTR){
383
error(0, errno, "sigaction");
381
perror("sigaction");
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382
status = EX_OSERR;
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383
}
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goto failure;
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387
ret = sigaction(SIGTERM, &new_action, NULL);
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388
if(ret == -1){
391
389
if(errno != EINTR){
392
error(0, errno, "sigaction");
390
perror("sigaction");
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391
status = EX_OSERR;
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392
}
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goto failure;
401
399
/* Write command to FIFO */
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400
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
403
401
if(errno != EINTR){
404
error(0, errno, "usplash_write");
402
perror("usplash_write");
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403
status = EX_OSERR;
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404
}
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goto failure;
413
411
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if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
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if(errno != EINTR){
416
error(0, errno, "usplash_write");
414
perror("usplash_write");
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status = EX_OSERR;
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}
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goto failure;
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outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
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if(outfifo_fd == -1){
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if(errno != EINTR){
434
error(0, errno, "open");
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perror("open");
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433
status = EX_OSERR;
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434
}
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goto failure;
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448
char *tmp = realloc(buf, buf_allocated + blocksize);
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449
if(tmp == NULL){
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450
if(errno != EINTR){
453
error(0, errno, "realloc");
451
perror("realloc");
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452
status = EX_OSERR;
455
453
}
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goto failure;
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buf_allocated - buf_len);
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461
if(sret == -1){
464
462
if(errno != EINTR){
465
error(0, errno, "read");
463
perror("read");
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464
status = EX_OSERR;
467
465
}
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466
TEMP_FAILURE_RETRY(close(outfifo_fd));
477
475
ret = close(outfifo_fd);
478
476
if(ret == -1){
479
477
if(errno != EINTR){
480
error(0, errno, "close");
478
perror("close");
481
479
status = EX_OSERR;
482
480
}
483
481
goto failure;
490
488
491
489
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
492
490
if(errno != EINTR){
493
error(0, errno, "usplash_write");
491
perror("usplash_write");
494
492
status = EX_OSERR;
495
493
}
496
494
goto failure;
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501
ret = close(fifo_fd);
504
502
if(ret == -1){
505
503
if(errno != EINTR){
506
error(0, errno, "close");
504
perror("close");
507
505
status = EX_OSERR;
508
506
}
509
507
goto failure;
517
515
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
518
516
if(sret == -1){
519
517
if(errno != EINTR){
520
error(0, errno, "write");
518
perror("write");
521
519
status = EX_OSERR;
522
520
}
523
521
goto failure;
554
552
if(fifo_fd != -1){
555
553
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
556
554
if(ret == -1 and errno != EINTR){
557
error(0, errno, "close");
555
perror("close");
558
556
}
559
557
fifo_fd = -1;
560
558
}
563
561
if(outfifo_fd != -1){
564
562
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
565
563
if(ret == -1){
566
error(0, errno, "close");
567
}
568
}
569
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");
575
return status;
576
}
577
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
578
564
perror("close");
565
}
566
}
567
568
/* Create argc and argv for new usplash*/
569
int cmdline_argc = 0;
570
char **cmdline_argv = malloc(sizeof(char *));
571
{
572
size_t position = 0;
573
while(position < cmdline_len){
574
char **tmp = realloc(cmdline_argv,
575
(sizeof(char *)
576
* (size_t)(cmdline_argc + 2)));
577
if(tmp == NULL){
578
perror("realloc");
579
free(cmdline_argv);
580
return status;
581
}
582
cmdline_argv = tmp;
583
cmdline_argv[cmdline_argc] = cmdline + position;
584
cmdline_argc++;
585
position += strlen(cmdline + position) + 1;
586
}
587
cmdline_argv[cmdline_argc] = NULL;
588
}
579
589
/* Kill old usplash */
580
590
kill(usplash_pid, SIGTERM);
581
591
sleep(2);
592
602
the real user ID (_mandos) */
593
603
ret = setuid(geteuid());
594
604
if(ret == -1){
595
error(0, errno, "setuid");
605
perror("setuid");
596
606
}
597
607
598
608
setsid();
599
609
ret = chdir("/");
600
if(ret == -1){
601
error(0, errno, "chdir");
602
_exit(EX_OSERR);
603
}
604
610
/* if(fork() != 0){ */
605
611
/* _exit(EXIT_SUCCESS); */
606
612
/* } */
607
613
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
608
614
if(ret == -1){
609
error(0, errno, "dup2");
615
perror("dup2");
610
616
_exit(EX_OSERR);
611
617
}
612
618
613
619
execv(usplash_name, cmdline_argv);
614
620
if(not interrupted_by_signal){
615
error(0, errno, "execv");
621
perror("execv");
616
622
}
617
623
free(cmdline);
618
624
free(cmdline_argv);
623
629
sleep(2);
624
630
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
625
631
if(errno != EINTR){
626
error(0, errno, "usplash_write");
632
perror("usplash_write");
627
633
}
628
634
}
629
635
631
637
if(fifo_fd != -1){
632
638
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
633
639
if(ret == -1 and errno != EINTR){
634
error(0, errno, "close");
640
perror("close");
635
641
}
636
642
fifo_fd = -1;
637
643
}
642
648
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
643
649
&signal_action, NULL));
644
650
if(ret == -1){
645
error(0, errno, "sigaction");
651
perror("sigaction");
646
652
}
647
653
do {
648
654
ret = raise(signal_received);
649
655
} while(ret != 0 and errno == EINTR);
650
656
if(ret != 0){
651
error(0, errno, "raise");
657
perror("raise");
652
658
abort();
653
659
}
654
660
TEMP_FAILURE_RETRY(pause());
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