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- Committer: Teddy Hogeborn
- Date: 2008-09-24 23:12:49 UTC
- Revision ID: teddy@fukt.bsnet.se-20080924231249-0xhjl5ydrbcjvce7
* debian/mandos-client.lintian-overrides: Ignore setuid
"plugins.d/usplash".
"plugins.d/usplash".
added
removed
plugins.d/usplash.c
27
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interrupted_by_signal = 1;
28
28
}
29
29
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static bool usplash_write(const char *cmd, const char *arg){
31
/*
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* usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
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* usplash_write("PULSATE", NULL); -> "PULSATE\0"
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* SEE ALSO
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* usplash_write(8)
36
*/
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int ret;
38
int fifo_fd;
39
do{
40
fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
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if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
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return false;
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}
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}while(fifo_fd == -1);
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const char *cmd_line;
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char *cmd_line_alloc = NULL;
48
if(arg == NULL){
49
cmd_line = cmd;
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ret = (int)strlen(cmd);
51
}else{
52
do{
53
ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
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if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
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int e = errno;
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close(fifo_fd);
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errno = e;
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return false;
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}
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}while(ret == -1);
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cmd_line = cmd_line_alloc;
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}
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size_t cmd_line_len = (size_t)ret + 1;
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size_t written = 0;
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while(not interrupted_by_signal and written < cmd_line_len){
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ret = write(fifo_fd, cmd_line + written,
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cmd_line_len - written);
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if(ret == -1){
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if(errno != EINTR or interrupted_by_signal){
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int e = errno;
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close(fifo_fd);
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free(cmd_line_alloc);
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errno = e;
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return false;
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} else {
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continue;
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}
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}
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written += (size_t)ret;
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}
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free(cmd_line_alloc);
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do{
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ret = close(fifo_fd);
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if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
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return false;
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}
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}while(ret == -1);
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if(interrupted_by_signal){
90
return false;
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}
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return true;
93
}
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95
30
int main(__attribute__((unused))int argc,
96
31
__attribute__((unused))char **argv){
97
32
int ret = 0;
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64
pid_t usplash_pid = 0;
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char *cmdline = NULL;
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size_t cmdline_len = 0;
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const char usplash_name[] = "/sbin/usplash";
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{
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const char usplash_name[] = "/sbin/usplash";
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DIR *proc_dir = opendir("/proc");
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if(proc_dir == NULL){
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free(prompt);
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/* Write command to FIFO */
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if(not interrupted_by_signal){
285
if(not usplash_write("TIMEOUT", "0")
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and (errno != EINTR)){
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perror("usplash_write");
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an_error_occured = true;
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}
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}
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if(not interrupted_by_signal and not an_error_occured){
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if(not usplash_write("INPUTQUIET", prompt)
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and (errno != EINTR)){
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perror("usplash_write");
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an_error_occured = true;
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}
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}
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free(prompt);
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int fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
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if(fifo_fd == -1){
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perror("open");
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free(prompt);
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return EXIT_FAILURE;
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}
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char *command;
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ret = asprintf(&command, "INPUTQUIET %s", prompt);
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if(ret == -1){
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perror("asprintf");
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free(prompt);
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return EXIT_FAILURE;
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}
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free(prompt);
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size_t command_len = (size_t)ret + 1;
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size_t written = 0;
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while(not interrupted_by_signal and written < command_len){
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ret = write(fifo_fd, command + written, command_len - written);
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if(ret == -1){
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if(interrupted_by_signal){
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break;
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}
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perror("write");
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if(written == 0){
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free(command);
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return EXIT_FAILURE;
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}
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an_error_occured = true;
249
break;
250
}
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written += (size_t)ret;
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}
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ret = close(fifo_fd);
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if(ret == -1 and not interrupted_by_signal){
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an_error_occured = true;
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}
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free(command);
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}else{
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free(prompt);
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}
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/* This is not really a loop; while() is used to be able to "break"
301
out of it; those breaks are marked "Big" */
302
while(not interrupted_by_signal and not an_error_occured){
262
{
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char *buf = NULL;
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size_t buf_len = 0;
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265
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/* Open FIFO */
307
int fifo_fd;
308
do{
309
fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
310
if(fifo_fd == -1){
311
if(errno != EINTR){
312
perror("open");
313
an_error_occured = true;
314
break;
315
}
316
if(interrupted_by_signal){
317
break;
318
}
319
}
320
}while(fifo_fd == -1);
321
if(interrupted_by_signal or an_error_occured){
322
break; /* Big */
323
}
324
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/* Read from FIFO */
326
size_t buf_allocated = 0;
327
const size_t blocksize = 1024;
328
do{
329
if(buf_len + blocksize > buf_allocated){
330
char *tmp = realloc(buf, buf_allocated + blocksize);
331
if(tmp == NULL){
332
perror("realloc");
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an_error_occured = true;
334
break;
335
}
336
buf = tmp;
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buf_allocated += blocksize;
267
if(not interrupted_by_signal and not an_error_occured){
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int fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
269
if(fifo_fd == -1 and not interrupted_by_signal){
270
perror("open");
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return EXIT_FAILURE;
338
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}
273
size_t buf_allocated = 0;
274
const int blocksize = 1024;
339
275
do{
276
if(buf_len + blocksize > buf_allocated){
277
char *tmp = realloc(buf, buf_allocated + blocksize);
278
if(tmp == NULL){
279
perror("realloc");
280
an_error_occured = true;
281
break;
282
}
283
buf = tmp;
284
buf_allocated += blocksize;
285
}
340
286
sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
341
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if(sret == -1){
342
if(errno != EINTR){
343
perror("read");
344
an_error_occured = true;
345
break;
346
}
347
if(interrupted_by_signal){
348
break;
349
}
288
perror("read");
289
an_error_occured = true;
290
break;
350
291
}
351
}while(sret == -1);
352
if(interrupted_by_signal or an_error_occured){
353
break;
354
}
355
356
buf_len += (size_t)sret;
357
}while(sret != 0);
358
close(fifo_fd);
359
if(interrupted_by_signal or an_error_occured){
360
break; /* Big */
361
}
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363
if(not usplash_write("TIMEOUT", "15")
364
and (errno != EINTR)){
365
perror("usplash_write");
366
an_error_occured = true;
367
}
368
if(interrupted_by_signal or an_error_occured){
369
break; /* Big */
370
}
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292
buf_len += (size_t)sret;
293
}while(not interrupted_by_signal and sret != 0);
294
close(fifo_fd);
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}
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/* Print password to stdout */
373
size_t written = 0;
374
do{
298
if(not interrupted_by_signal and not an_error_occured){
299
size_t written = 0;
375
300
do{
376
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sret = write(STDOUT_FILENO, buf + written, buf_len - written);
377
if(sret == -1){
378
if(errno != EINTR){
379
perror("write");
380
an_error_occured = true;
381
break;
382
}
383
if(interrupted_by_signal){
384
break;
385
}
302
if(sret == -1 and not interrupted_by_signal){
303
perror("write");
304
an_error_occured = true;
305
break;
386
306
}
387
}while(sret == -1);
388
if(interrupted_by_signal or an_error_occured){
389
break;
307
written += (size_t)sret;
308
}while(written < buf_len);
309
if(not interrupted_by_signal and not an_error_occured){
310
return EXIT_SUCCESS;
390
311
}
391
392
written += (size_t)sret;
393
}while(written < buf_len);
394
if(not interrupted_by_signal and not an_error_occured){
395
return EXIT_SUCCESS;
396
312
}
397
break; /* Big */
398
313
}
399
314
400
/* If we got here, an error or interrupt must have happened */
315
kill(usplash_pid, SIGTERM);
401
316
402
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int cmdline_argc = 0;
403
318
char **cmdline_argv = malloc(sizeof(char *));
404
319
/* Create argv and argc for new usplash*/
405
320
{
406
size_t position = 0;
407
while(position < cmdline_len){
321
ptrdiff_t position = 0;
322
while((size_t)position < cmdline_len){
408
323
char **tmp = realloc(cmdline_argv,
409
324
(sizeof(char *) * (size_t)(cmdline_argc + 2)));
410
325
if(tmp == NULL){
415
330
cmdline_argv = tmp;
416
331
cmdline_argv[cmdline_argc] = cmdline + position;
417
332
cmdline_argc++;
418
position += strlen(cmdline + position) + 1;
333
position = (char *)rawmemchr(cmdline + position, '\0')
334
- cmdline + 1;
419
335
}
420
336
cmdline_argv[cmdline_argc] = NULL;
421
337
}
422
/* Kill old usplash */
423
kill(usplash_pid, SIGTERM);
424
sleep(2);
425
while(kill(usplash_pid, 0) == 0){
426
kill(usplash_pid, SIGKILL);
427
sleep(1);
428
}
429
338
pid_t new_usplash_pid = fork();
430
339
if(new_usplash_pid == 0){
431
340
/* Child; will become new usplash process */
432
433
/* Make the effective user ID (root) the only user ID instead of
434
the real user ID (mandos) */
435
ret = setuid(geteuid());
436
if (ret == -1){
437
perror("setuid");
341
while(kill(usplash_pid, 0)){
342
sleep(2);
343
kill(usplash_pid, SIGKILL);
344
sleep(1);
438
345
}
439
440
setsid();
441
ret = chdir("/");
442
/* if(fork() != 0){ */
443
/* _exit(EXIT_SUCCESS); */
444
/* } */
445
346
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
446
347
if(ret == -1){
447
348
perror("dup2");
448
349
_exit(EXIT_FAILURE);
449
350
}
450
451
execv(usplash_name, cmdline_argv);
452
}
453
sleep(2);
454
if(not usplash_write("PULSATE", NULL)
455
and (errno != EINTR)){
456
perror("usplash_write");
351
execv("/sbin/usplash", cmdline_argv);
457
352
}
458
353
459
354
return EXIT_FAILURE;
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