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- Committer: teddy at bsnet
- Date: 2010-10-05 19:32:45 UTC
- mfrom: (237.4.8 mandos-release)
- Revision ID: teddy@fukt.bsnet.se-20101005193245-2ku2c6a9ht4bfv43
Merge from release branch.
added
removed
plugins.d/usplash.c
2
2
/*
3
3
* Usplash - Read a password from usplash and output it
4
4
*
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
7
7
*
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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
35
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#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
36
36
dirent */
37
37
#include <stddef.h> /* NULL */
38
#include <string.h> /* strlen(), memcmp(), strerror() */
39
#include <stdio.h> /* asprintf(), vasprintf(), vprintf(),
40
fprintf() */
38
#include <string.h> /* strlen(), memcmp() */
39
#include <stdio.h> /* asprintf()*/
41
40
#include <unistd.h> /* close(), write(), readlink(),
42
41
read(), STDOUT_FILENO, sleep(),
43
42
fork(), setuid(), geteuid(),
51
50
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
52
51
#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
53
52
#include <argz.h> /* argz_count(), argz_extract() */
54
#include <stdarg.h> /* va_list, va_start(), ... */
55
53
56
54
sig_atomic_t interrupted_by_signal = 0;
57
55
int signal_received;
58
56
const char usplash_name[] = "/sbin/usplash";
59
57
60
/* Function to use when printing errors */
61
void error_plus(int status, int errnum, const char *formatstring,
62
...){
63
va_list ap;
64
char *text;
65
int ret;
66
67
va_start(ap, formatstring);
68
ret = vasprintf(&text, formatstring, ap);
69
if (ret == -1){
70
fprintf(stderr, "Mandos plugin %s: ",
71
program_invocation_short_name);
72
vfprintf(stderr, formatstring, ap);
73
fprintf(stderr, ": ");
74
fprintf(stderr, "%s\n", strerror(errnum));
75
error(status, errno, "vasprintf while printing error");
76
return;
77
}
78
fprintf(stderr, "Mandos plugin ");
79
error(status, errnum, "%s", text);
80
free(text);
81
}
82
83
58
static void termination_handler(int signum){
84
59
if(interrupted_by_signal){
85
60
return;
180
155
size_t cmdline_len = 0;
181
156
DIR *proc_dir = opendir("/proc");
182
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if(proc_dir == NULL){
183
error_plus(0, errno, "opendir");
158
error(0, errno, "opendir");
184
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return -1;
185
160
}
186
161
errno = 0;
208
183
char *exe_link;
209
184
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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185
if(ret == -1){
211
error_plus(0, errno, "asprintf");
186
error(0, errno, "asprintf");
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187
goto fail_find_usplash;
213
188
}
214
189
220
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free(exe_link);
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196
continue;
222
197
}
223
error_plus(0, errno, "lstat");
198
error(0, errno, "lstat");
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199
free(exe_link);
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200
goto fail_find_usplash;
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201
}
251
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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){
254
error_plus(0, errno, "asprintf");
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error(0, errno, "asprintf");
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goto fail_find_usplash;
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231
}
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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_plus(0, errno, "open");
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error(0, errno, "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_plus(0, errno, "realloc");
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error(0, errno, "realloc");
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close(cl_fd);
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goto fail_find_usplash;
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}
280
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sret = read(cl_fd, cmdline + cmdline_len,
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cmdline_allocated - cmdline_len);
282
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if(sret == -1){
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error_plus(0, errno, "read");
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error(0, errno, "read");
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close(cl_fd);
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goto fail_find_usplash;
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}
288
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} while(sret != 0);
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ret = close(cl_fd);
290
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if(ret == -1){
291
error_plus(0, errno, "close");
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error(0, errno, "close");
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goto fail_find_usplash;
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268
}
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}
295
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/* Close directory */
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ret = closedir(proc_dir);
297
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if(ret == -1){
298
error_plus(0, errno, "closedir");
273
error(0, errno, "closedir");
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goto fail_find_usplash;
300
275
}
301
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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);
352
327
if(ret == -1){
353
error_plus(0, errno, "sigaddset");
328
error(0, errno, "sigaddset");
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status = EX_OSERR;
355
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goto failure;
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331
}
357
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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if(ret == -1){
359
error_plus(0, errno, "sigaddset");
334
error(0, errno, "sigaddset");
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status = EX_OSERR;
361
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goto failure;
362
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}
363
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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if(ret == -1){
365
error_plus(0, errno, "sigaddset");
340
error(0, errno, "sigaddset");
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status = EX_OSERR;
367
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goto failure;
368
343
}
369
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ret = sigaction(SIGINT, NULL, &old_action);
370
345
if(ret == -1){
371
346
if(errno != EINTR){
372
error_plus(0, errno, "sigaction");
347
error(0, errno, "sigaction");
373
348
status = EX_OSERR;
374
349
}
375
350
goto failure;
378
353
ret = sigaction(SIGINT, &new_action, NULL);
379
354
if(ret == -1){
380
355
if(errno != EINTR){
381
error_plus(0, errno, "sigaction");
356
error(0, errno, "sigaction");
382
357
status = EX_OSERR;
383
358
}
384
359
goto failure;
387
362
ret = sigaction(SIGHUP, NULL, &old_action);
388
363
if(ret == -1){
389
364
if(errno != EINTR){
390
error_plus(0, errno, "sigaction");
365
error(0, errno, "sigaction");
391
366
status = EX_OSERR;
392
367
}
393
368
goto failure;
396
371
ret = sigaction(SIGHUP, &new_action, NULL);
397
372
if(ret == -1){
398
373
if(errno != EINTR){
399
error_plus(0, errno, "sigaction");
374
error(0, errno, "sigaction");
400
375
status = EX_OSERR;
401
376
}
402
377
goto failure;
405
380
ret = sigaction(SIGTERM, NULL, &old_action);
406
381
if(ret == -1){
407
382
if(errno != EINTR){
408
error_plus(0, errno, "sigaction");
383
error(0, errno, "sigaction");
409
384
status = EX_OSERR;
410
385
}
411
386
goto failure;
414
389
ret = sigaction(SIGTERM, &new_action, NULL);
415
390
if(ret == -1){
416
391
if(errno != EINTR){
417
error_plus(0, errno, "sigaction");
392
error(0, errno, "sigaction");
418
393
status = EX_OSERR;
419
394
}
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395
goto failure;
426
401
/* Write command to FIFO */
427
402
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
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403
if(errno != EINTR){
429
error_plus(0, errno, "usplash_write");
404
error(0, errno, "usplash_write");
430
405
status = EX_OSERR;
431
406
}
432
407
goto failure;
438
413
439
414
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
440
415
if(errno != EINTR){
441
error_plus(0, errno, "usplash_write");
416
error(0, errno, "usplash_write");
442
417
status = EX_OSERR;
443
418
}
444
419
goto failure;
456
431
outfifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
457
432
if(outfifo_fd == -1){
458
433
if(errno != EINTR){
459
error_plus(0, errno, "open");
434
error(0, errno, "open");
460
435
status = EX_OSERR;
461
436
}
462
437
goto failure;
475
450
char *tmp = realloc(buf, buf_allocated + blocksize);
476
451
if(tmp == NULL){
477
452
if(errno != EINTR){
478
error_plus(0, errno, "realloc");
453
error(0, errno, "realloc");
479
454
status = EX_OSERR;
480
455
}
481
456
goto failure;
487
462
buf_allocated - buf_len);
488
463
if(sret == -1){
489
464
if(errno != EINTR){
490
error_plus(0, errno, "read");
465
error(0, errno, "read");
491
466
status = EX_OSERR;
492
467
}
493
468
TEMP_FAILURE_RETRY(close(outfifo_fd));
502
477
ret = close(outfifo_fd);
503
478
if(ret == -1){
504
479
if(errno != EINTR){
505
error_plus(0, errno, "close");
480
error(0, errno, "close");
506
481
status = EX_OSERR;
507
482
}
508
483
goto failure;
515
490
516
491
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
517
492
if(errno != EINTR){
518
error_plus(0, errno, "usplash_write");
493
error(0, errno, "usplash_write");
519
494
status = EX_OSERR;
520
495
}
521
496
goto failure;
528
503
ret = close(fifo_fd);
529
504
if(ret == -1){
530
505
if(errno != EINTR){
531
error_plus(0, errno, "close");
506
error(0, errno, "close");
532
507
status = EX_OSERR;
533
508
}
534
509
goto failure;
542
517
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
543
518
if(sret == -1){
544
519
if(errno != EINTR){
545
error_plus(0, errno, "write");
520
error(0, errno, "write");
546
521
status = EX_OSERR;
547
522
}
548
523
goto failure;
579
554
if(fifo_fd != -1){
580
555
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
581
556
if(ret == -1 and errno != EINTR){
582
error_plus(0, errno, "close");
557
error(0, errno, "close");
583
558
}
584
559
fifo_fd = -1;
585
560
}
588
563
if(outfifo_fd != -1){
589
564
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
590
565
if(ret == -1){
591
error_plus(0, errno, "close");
566
error(0, errno, "close");
592
567
}
593
568
}
594
569
596
571
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
597
572
* sizeof(char *)); /* Count args */
598
573
if(cmdline_argv == NULL){
599
error_plus(0, errno, "malloc");
574
error(0, errno, "malloc");
600
575
return status;
601
576
}
602
577
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
617
592
the real user ID (_mandos) */
618
593
ret = setuid(geteuid());
619
594
if(ret == -1){
620
error_plus(0, errno, "setuid");
595
error(0, errno, "setuid");
621
596
}
622
597
623
598
setsid();
624
599
ret = chdir("/");
625
600
if(ret == -1){
626
error_plus(0, errno, "chdir");
601
error(0, errno, "chdir");
627
602
_exit(EX_OSERR);
628
603
}
629
604
/* if(fork() != 0){ */
631
606
/* } */
632
607
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
633
608
if(ret == -1){
634
error_plus(0, errno, "dup2");
609
error(0, errno, "dup2");
635
610
_exit(EX_OSERR);
636
611
}
637
612
638
613
execv(usplash_name, cmdline_argv);
639
614
if(not interrupted_by_signal){
640
error_plus(0, errno, "execv");
615
error(0, errno, "execv");
641
616
}
642
617
free(cmdline);
643
618
free(cmdline_argv);
648
623
sleep(2);
649
624
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
650
625
if(errno != EINTR){
651
error_plus(0, errno, "usplash_write");
626
error(0, errno, "usplash_write");
652
627
}
653
628
}
654
629
656
631
if(fifo_fd != -1){
657
632
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
658
633
if(ret == -1 and errno != EINTR){
659
error_plus(0, errno, "close");
634
error(0, errno, "close");
660
635
}
661
636
fifo_fd = -1;
662
637
}
667
642
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
668
643
&signal_action, NULL));
669
644
if(ret == -1){
670
error_plus(0, errno, "sigaction");
645
error(0, errno, "sigaction");
671
646
}
672
647
do {
673
648
ret = raise(signal_received);
674
649
} while(ret != 0 and errno == EINTR);
675
650
if(ret != 0){
676
error_plus(0, errno, "raise");
651
error(0, errno, "raise");
677
652
abort();
678
653
}
679
654
TEMP_FAILURE_RETRY(pause());
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