19
19
* along with this program. If not, see
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20
* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@recompile.se>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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25
#define _GNU_SOURCE /* asprintf(), TEMP_FAILURE_RETRY() */
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#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
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#include <stddef.h> /* NULL */
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#include <string.h> /* strlen(), memcmp(), strerror() */
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#include <stdio.h> /* asprintf(), vasprintf(), vprintf(),
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#include <string.h> /* strlen(), memcmp() */
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#include <stdio.h> /* asprintf()*/
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#include <unistd.h> /* close(), write(), readlink(),
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read(), STDOUT_FILENO, sleep(),
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fork(), setuid(), geteuid(),
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#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
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#include <sysexits.h> /* EX_OSERR, EX_UNAVAILABLE */
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#include <argz.h> /* argz_count(), argz_extract() */
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#include <stdarg.h> /* va_list, va_start(), ... */
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54
sig_atomic_t interrupted_by_signal = 0;
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int signal_received;
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56
const char usplash_name[] = "/sbin/usplash";
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/* Function to use when printing errors */
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__attribute__((format (gnu_printf, 3, 4)))
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void error_plus(int status, int errnum, const char *formatstring,
68
va_start(ap, formatstring);
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ret = vasprintf(&text, formatstring, ap);
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fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
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vfprintf(stderr, formatstring, ap);
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fprintf(stderr, ": ");
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fprintf(stderr, "%s\n", strerror(errnum));
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error(status, errno, "vasprintf while printing error");
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fprintf(stderr, "Mandos plugin ");
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error(status, errnum, "%s", text);
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58
static void termination_handler(int signum){
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59
if(interrupted_by_signal){
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155
size_t cmdline_len = 0;
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DIR *proc_dir = opendir("/proc");
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if(proc_dir == NULL){
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error_plus(0, errno, "opendir");
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error(0, errno, "opendir");
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184
ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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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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ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
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proc_ent->d_name);
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error_plus(0, errno, "asprintf");
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error(0, errno, "asprintf");
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230
goto fail_find_usplash;
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cl_fd = open(cmdline_filename, O_RDONLY);
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free(cmdline_filename);
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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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if(cmdline_len + blocksize > cmdline_allocated){
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245
tmp = realloc(cmdline, cmdline_allocated + blocksize);
273
error_plus(0, errno, "realloc");
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error(0, errno, "realloc");
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goto fail_find_usplash;
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sret = read(cl_fd, cmdline + cmdline_len,
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256
cmdline_allocated - cmdline_len);
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error_plus(0, errno, "read");
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error(0, errno, "read");
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260
goto fail_find_usplash;
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263
} while(sret != 0);
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ret = close(cl_fd);
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error_plus(0, errno, "close");
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error(0, errno, "close");
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267
goto fail_find_usplash;
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270
/* Close directory */
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ret = closedir(proc_dir);
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error_plus(0, errno, "closedir");
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error(0, errno, "closedir");
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274
goto fail_find_usplash;
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325
sigemptyset(&new_action.sa_mask);
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ret = sigaddset(&new_action.sa_mask, SIGINT);
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error_plus(0, errno, "sigaddset");
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error(0, errno, "sigaddset");
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status = EX_OSERR;
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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error_plus(0, errno, "sigaddset");
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error(0, errno, "sigaddset");
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status = EX_OSERR;
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338
ret = sigaddset(&new_action.sa_mask, SIGTERM);
366
error_plus(0, errno, "sigaddset");
340
error(0, errno, "sigaddset");
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status = EX_OSERR;
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ret = sigaction(SIGINT, NULL, &old_action);
372
346
if(errno != EINTR){
373
error_plus(0, errno, "sigaction");
347
error(0, errno, "sigaction");
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status = EX_OSERR;
379
353
ret = sigaction(SIGINT, &new_action, NULL);
381
355
if(errno != EINTR){
382
error_plus(0, errno, "sigaction");
356
error(0, errno, "sigaction");
383
357
status = EX_OSERR;
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362
ret = sigaction(SIGHUP, NULL, &old_action);
390
364
if(errno != EINTR){
391
error_plus(0, errno, "sigaction");
365
error(0, errno, "sigaction");
392
366
status = EX_OSERR;
397
371
ret = sigaction(SIGHUP, &new_action, NULL);
399
373
if(errno != EINTR){
400
error_plus(0, errno, "sigaction");
374
error(0, errno, "sigaction");
401
375
status = EX_OSERR;
406
380
ret = sigaction(SIGTERM, NULL, &old_action);
408
382
if(errno != EINTR){
409
error_plus(0, errno, "sigaction");
383
error(0, errno, "sigaction");
410
384
status = EX_OSERR;
415
389
ret = sigaction(SIGTERM, &new_action, NULL);
417
391
if(errno != EINTR){
418
error_plus(0, errno, "sigaction");
392
error(0, errno, "sigaction");
419
393
status = EX_OSERR;
427
401
/* Write command to FIFO */
428
402
if(not usplash_write(&fifo_fd, "TIMEOUT", "0")){
429
403
if(errno != EINTR){
430
error_plus(0, errno, "usplash_write");
404
error(0, errno, "usplash_write");
431
405
status = EX_OSERR;
440
414
if(not usplash_write(&fifo_fd, "INPUTQUIET", prompt)){
441
415
if(errno != EINTR){
442
error_plus(0, errno, "usplash_write");
416
error(0, errno, "usplash_write");
443
417
status = EX_OSERR;
476
450
char *tmp = realloc(buf, buf_allocated + blocksize);
478
452
if(errno != EINTR){
479
error_plus(0, errno, "realloc");
453
error(0, errno, "realloc");
480
454
status = EX_OSERR;
517
491
if(not usplash_write(&fifo_fd, "TIMEOUT", "15")){
518
492
if(errno != EINTR){
519
error_plus(0, errno, "usplash_write");
493
error(0, errno, "usplash_write");
520
494
status = EX_OSERR;
543
517
sret = write(STDOUT_FILENO, buf + written, buf_len - written);
545
519
if(errno != EINTR){
546
error_plus(0, errno, "write");
520
error(0, errno, "write");
547
521
status = EX_OSERR;
580
554
if(fifo_fd != -1){
581
555
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
582
556
if(ret == -1 and errno != EINTR){
583
error_plus(0, errno, "close");
557
error(0, errno, "close");
589
563
if(outfifo_fd != -1){
590
564
ret = (int)TEMP_FAILURE_RETRY(close(outfifo_fd));
592
error_plus(0, errno, "close");
566
error(0, errno, "close");
597
571
char **cmdline_argv = malloc((argz_count(cmdline, cmdline_len) + 1)
598
572
* sizeof(char *)); /* Count args */
599
573
if(cmdline_argv == NULL){
600
error_plus(0, errno, "malloc");
574
error(0, errno, "malloc");
603
577
argz_extract(cmdline, cmdline_len, cmdline_argv); /* Create argv */
618
592
the real user ID (_mandos) */
619
593
ret = setuid(geteuid());
621
error_plus(0, errno, "setuid");
595
error(0, errno, "setuid");
625
599
ret = chdir("/");
627
error_plus(0, errno, "chdir");
601
error(0, errno, "chdir");
630
604
/* if(fork() != 0){ */
633
607
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
635
error_plus(0, errno, "dup2");
609
error(0, errno, "dup2");
639
613
execv(usplash_name, cmdline_argv);
640
614
if(not interrupted_by_signal){
641
error_plus(0, errno, "execv");
615
error(0, errno, "execv");
644
618
free(cmdline_argv);
650
624
if(not usplash_write(&fifo_fd, "PULSATE", NULL)){
651
625
if(errno != EINTR){
652
error_plus(0, errno, "usplash_write");
626
error(0, errno, "usplash_write");
657
631
if(fifo_fd != -1){
658
632
ret = (int)TEMP_FAILURE_RETRY(close(fifo_fd));
659
633
if(ret == -1 and errno != EINTR){
660
error_plus(0, errno, "close");
634
error(0, errno, "close");
668
642
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
669
643
&signal_action, NULL));
671
error_plus(0, errno, "sigaction");
645
error(0, errno, "sigaction");
674
648
ret = raise(signal_received);
675
649
} while(ret != 0 and errno == EINTR);
677
error_plus(0, errno, "raise");
651
error(0, errno, "raise");
680
654
TEMP_FAILURE_RETRY(pause());