/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
1
#define _GNU_SOURCE		/* asprintf() */
2
#include <signal.h>		/* sig_atomic_t, struct sigaction,
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
3
				   sigemptyset(), sigaddset(), SIGINT,
4
				   SIGHUP, SIGTERM, sigaction(),
5
				   SIG_IGN, kill(), SIGKILL */
6
#include <stdbool.h>		/* bool, false, true */
7
#include <fcntl.h>		/* open(), O_WRONLY, O_RDONLY */
8
#include <errno.h>		/* errno, EINTR */
9
#include <sys/types.h>		/* size_t, ssize_t, pid_t, DIR,
10
				   struct dirent */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
11
#include <stddef.h>		/* NULL */
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
12
#include <string.h>		/* strlen(), memcmp() */
13
#include <stdio.h>		/* asprintf(), perror() */
14
#include <unistd.h>		/* close(), write(), readlink(),
15
				   read(), STDOUT_FILENO, sleep(),
16
				   fork(), setuid(), geteuid(),
17
				   setsid(), chdir(), dup2(),
18
				   STDERR_FILENO, execv() */
19
#include <stdlib.h>		/* free(), EXIT_FAILURE, strtoul(),
20
				   realloc(), EXIT_SUCCESS, malloc(),
21
				   _exit() */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
22
#include <stdlib.h>		/* getenv() */
23
#include <dirent.h>		/* opendir(), readdir(), closedir() */
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
24
25
26
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
27
#include <iso646.h>		/* and */
28
#include <sys/wait.h>		/* waitpid(), WIFEXITED(),
29
				   WEXITSTATUS() */
30
31
sig_atomic_t interrupted_by_signal = 0;
32
33
static void termination_handler(__attribute__((unused))int signum){
34
  interrupted_by_signal = 1;
35
}
36
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
37
static bool usplash_write(const char *cmd, const char *arg){
38
  /* 
39
   * usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
40
   * usplash_write("PULSATE", NULL); -> "PULSATE\0"
41
   * SEE ALSO
42
   *         usplash_write(8)
43
   */
44
  int ret;
45
  int fifo_fd;
46
  do{
47
    fifo_fd = open("/dev/.initramfs/usplash_fifo", O_WRONLY);
48
    if(fifo_fd == -1 and (errno != EINTR or interrupted_by_signal)){
49
      return false;
50
    }
51
  }while(fifo_fd == -1);
52
  
53
  const char *cmd_line;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
54
  size_t cmd_line_len;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
55
  char *cmd_line_alloc = NULL;
56
  if(arg == NULL){
57
    cmd_line = cmd;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
58
    cmd_line_len = strlen(cmd);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
59
  }else{
60
    do{
61
      ret = asprintf(&cmd_line_alloc, "%s %s", cmd, arg);
62
      if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
63
	int e = errno;
64
	close(fifo_fd);
65
	errno = e;
66
	return false;
67
      }
68
    }while(ret == -1);
69
    cmd_line = cmd_line_alloc;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
70
    cmd_line_len = (size_t)ret + 1;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
71
  }
72
  
73
  size_t written = 0;
74
  while(not interrupted_by_signal and written < cmd_line_len){
75
    ret = write(fifo_fd, cmd_line + written,
76
		cmd_line_len - written);
77
    if(ret == -1){
78
      if(errno != EINTR or interrupted_by_signal){
79
	int e = errno;
80
	close(fifo_fd);
81
	free(cmd_line_alloc);
82
	errno = e;
83
	return false;
84
      } else {
85
	continue;
86
      }
87
    }
88
    written += (size_t)ret;
89
  }
90
  free(cmd_line_alloc);
91
  do{
92
    ret = close(fifo_fd);
93
    if(ret == -1 and (errno != EINTR or interrupted_by_signal)){
94
      return false;
95
    }
96
  }while(ret == -1);
97
  if(interrupted_by_signal){
98
    return false;
99
  }
100
  return true;
101
}
102
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
103
int main(__attribute__((unused))int argc,
104
	 __attribute__((unused))char **argv){
105
  int ret = 0;
106
  ssize_t sret;
107
  bool an_error_occured = false;
108
  
109
  /* Create prompt string */
110
  char *prompt = NULL;
111
  {
112
    const char *const cryptsource = getenv("cryptsource");
113
    const char *const crypttarget = getenv("crypttarget");
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
114
    const char prompt_start[] = "Enter passphrase to unlock the disk";
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
115
    
116
    if(cryptsource == NULL){
117
      if(crypttarget == NULL){
118
	ret = asprintf(&prompt, "%s: ", prompt_start);
119
      } else {
120
	ret = asprintf(&prompt, "%s (%s): ", prompt_start,
121
		       crypttarget);
122
      }
123
    } else {
124
      if(crypttarget == NULL){
125
	ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
126
      } else {
127
	ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
128
		       cryptsource, crypttarget);
129
      }
130
    }
131
    if(ret == -1){
132
      return EXIT_FAILURE;
133
    }
134
  }
135
  
136
  /* Find usplash process */
137
  pid_t usplash_pid = 0;
138
  char *cmdline = NULL;
139
  size_t cmdline_len = 0;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
140
  const char usplash_name[] = "/sbin/usplash";
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
141
  {
142
    DIR *proc_dir = opendir("/proc");
143
    if(proc_dir == NULL){
144
      free(prompt);
145
      perror("opendir");
146
      return EXIT_FAILURE;
147
    }
148
    for(struct dirent *proc_ent = readdir(proc_dir);
149
	proc_ent != NULL;
150
	proc_ent = readdir(proc_dir)){
151
      pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
152
      if(pid == 0){
153
	/* Not a process */
154
	continue;
155
      }
156
      /* Find the executable name by doing readlink() on the
157
	 /proc/<pid>/exe link */
158
      char exe_target[sizeof(usplash_name)];
159
      {
160
	char *exe_link;
161
	ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
162
	if(ret == -1){
163
	  perror("asprintf");
164
	  free(prompt);
165
	  closedir(proc_dir);
166
	  return EXIT_FAILURE;
167
	}
168
	sret = readlink(exe_link, exe_target, sizeof(exe_target));
169
	free(exe_link);
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
170
	if(sret == -1){
171
	  continue;
172
	}
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
173
      }
174
      if((sret == ((ssize_t)sizeof(exe_target)-1))
175
	 and (memcmp(usplash_name, exe_target,
176
		     sizeof(exe_target)-1) == 0)){
177
	usplash_pid = pid;
178
	/* Read and save the command line of usplash in "cmdline" */
179
	{
180
	  /* Open /proc/<pid>/cmdline  */
181
	  int cl_fd;
182
	  {
183
	    char *cmdline_filename;
184
	    ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
185
			   proc_ent->d_name);
186
	    if(ret == -1){
187
	      perror("asprintf");
188
	      free(prompt);
189
	      closedir(proc_dir);
190
	      return EXIT_FAILURE;
191
	    }
192
	    cl_fd = open(cmdline_filename, O_RDONLY);
193
	    if(cl_fd == -1){
194
	      perror("open");
195
	      free(cmdline_filename);
196
	      free(prompt);
197
	      closedir(proc_dir);
198
	      return EXIT_FAILURE;
199
	    }
200
	    free(cmdline_filename);
201
	  }
202
	  size_t cmdline_allocated = 0;
203
	  char *tmp;
204
	  const size_t blocksize = 1024;
205
	  do{
206
	    if(cmdline_len + blocksize > cmdline_allocated){
207
	      tmp = realloc(cmdline, cmdline_allocated + blocksize);
208
	      if(tmp == NULL){
209
		perror("realloc");
210
		free(cmdline);
211
		free(prompt);
212
		closedir(proc_dir);
213
		return EXIT_FAILURE;
214
	      }
215
	      cmdline = tmp;
216
	      cmdline_allocated += blocksize;
217
	    }
218
	    sret = read(cl_fd, cmdline + cmdline_len,
219
			cmdline_allocated - cmdline_len);
220
	    if(sret == -1){
221
	      perror("read");
222
	      free(cmdline);
223
	      free(prompt);
224
	      closedir(proc_dir);
225
	      return EXIT_FAILURE;
226
	    }
227
	    cmdline_len += (size_t)sret;
228
	  } while(sret != 0);
229
	  close(cl_fd);
230
	}
231
	break;
232
      }
233
    }
234
    closedir(proc_dir);
235
  }
236
  if(usplash_pid == 0){
237
    free(prompt);
238
    return EXIT_FAILURE;
239
  }
240
  
241
  /* Set up the signal handler */
242
  {
243
    struct sigaction old_action,
244
      new_action = { .sa_handler = termination_handler,
245
		     .sa_flags = 0 };
246
    sigemptyset(&new_action.sa_mask);
247
    sigaddset(&new_action.sa_mask, SIGINT);
248
    sigaddset(&new_action.sa_mask, SIGHUP);
249
    sigaddset(&new_action.sa_mask, SIGTERM);
250
    ret = sigaction(SIGINT, NULL, &old_action);
251
    if(ret == -1){
252
      perror("sigaction");
253
      free(prompt);
254
      return EXIT_FAILURE;
255
    }
256
    if (old_action.sa_handler != SIG_IGN){
257
      ret = sigaction(SIGINT, &new_action, NULL);
258
      if(ret == -1){
259
	perror("sigaction");
260
	free(prompt);
261
	return EXIT_FAILURE;
262
      }
263
    }
264
    ret = sigaction(SIGHUP, NULL, &old_action);
265
    if(ret == -1){
266
      perror("sigaction");
267
      free(prompt);
268
      return EXIT_FAILURE;
269
    }
270
    if (old_action.sa_handler != SIG_IGN){
271
      ret = sigaction(SIGHUP, &new_action, NULL);
272
      if(ret == -1){
273
	perror("sigaction");
274
	free(prompt);
275
	return EXIT_FAILURE;
276
      }
277
    }
278
    ret = sigaction(SIGTERM, NULL, &old_action);
279
    if(ret == -1){
280
      perror("sigaction");
281
      free(prompt);
282
      return EXIT_FAILURE;
283
    }
284
    if (old_action.sa_handler != SIG_IGN){
285
      ret = sigaction(SIGTERM, &new_action, NULL);
286
      if(ret == -1){
287
	perror("sigaction");
288
	free(prompt);
289
	return EXIT_FAILURE;
290
      }
291
    }
292
  }
293
  
294
  /* Write command to FIFO */
295
  if(not interrupted_by_signal){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
296
    if(not usplash_write("TIMEOUT", "0")
297
       and (errno != EINTR)){
298
      perror("usplash_write");
299
      an_error_occured = true;
300
    }
301
  }
302
  if(not interrupted_by_signal and not an_error_occured){
303
    if(not usplash_write("INPUTQUIET", prompt)
304
       and (errno != EINTR)){
305
      perror("usplash_write");
306
      an_error_occured = true;
307
    }
308
  }
309
  free(prompt);
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
310
  
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
311
  /* This is not really a loop; while() is used to be able to "break"
312
     out of it; those breaks are marked "Big" */
313
  while(not interrupted_by_signal and not an_error_occured){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
314
    char *buf = NULL;
315
    size_t buf_len = 0;
316
    
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
317
    /* Open FIFO */
318
    int fifo_fd;
319
    do{
320
      fifo_fd = open("/dev/.initramfs/usplash_outfifo", O_RDONLY);
321
      if(fifo_fd == -1){
322
	if(errno != EINTR){
323
	  perror("open");
324
	  an_error_occured = true;
325
	  break;
326
	}
327
	if(interrupted_by_signal){
328
	  break;
329
	}
330
      }
331
    }while(fifo_fd == -1);
332
    if(interrupted_by_signal or an_error_occured){
333
      break;			/* Big */
334
    }
335
    
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
336
    /* Read from FIFO */
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
337
    size_t buf_allocated = 0;
338
    const size_t blocksize = 1024;
339
    do{
340
      if(buf_len + blocksize > buf_allocated){
341
	char *tmp = realloc(buf, buf_allocated + blocksize);
342
	if(tmp == NULL){
343
	  perror("realloc");
344
	  an_error_occured = true;
345
	  break;
346
	}
347
	buf = tmp;
348
	buf_allocated += blocksize;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
349
      }
350
      do{
351
	sret = read(fifo_fd, buf + buf_len, buf_allocated - buf_len);
352
	if(sret == -1){
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
353
	  if(errno != EINTR){
354
	    perror("read");
355
	    an_error_occured = true;
356
	    break;
357
	  }
358
	  if(interrupted_by_signal){
359
	    break;
360
	  }
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
361
	}
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
362
      }while(sret == -1);
363
      if(interrupted_by_signal or an_error_occured){
364
	break;
365
      }
366
      
367
      buf_len += (size_t)sret;
368
    }while(sret != 0);
369
    close(fifo_fd);
370
    if(interrupted_by_signal or an_error_occured){
371
      break;			/* Big */
372
    }
373
    
374
    if(not usplash_write("TIMEOUT", "15")
375
       and (errno != EINTR)){
376
	perror("usplash_write");
377
	an_error_occured = true;
378
    }
379
    if(interrupted_by_signal or an_error_occured){
380
      break;			/* Big */
381
    }
382
    
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
383
    /* Print password to stdout */
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
384
    size_t written = 0;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
385
    while(written < buf_len){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
386
      do{
387
	sret = write(STDOUT_FILENO, buf + written, buf_len - written);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
388
	if(sret == -1){
389
	  if(errno != EINTR){
390
	    perror("write");
391
	    an_error_occured = true;
392
	    break;
393
	  }
394
	  if(interrupted_by_signal){
395
	    break;
396
	  }
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
397
	}
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
398
      }while(sret == -1);
399
      if(interrupted_by_signal or an_error_occured){
400
	break;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
401
      }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
402
      written += (size_t)sret;
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
403
    }
404
    free(buf);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
405
    if(not interrupted_by_signal and not an_error_occured){
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
406
      free(cmdline);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
407
      return EXIT_SUCCESS;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
408
    }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
409
    break;			/* Big */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
410
  }
411
  
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
412
  /* If we got here, an error or interrupt must have happened */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
413
  
414
  int cmdline_argc = 0;
415
  char **cmdline_argv = malloc(sizeof(char *));
416
  /* Create argv and argc for new usplash*/
417
  {
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
418
    size_t position = 0;
419
    while(position < cmdline_len){
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
420
      char **tmp = realloc(cmdline_argv,
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
421
			   (sizeof(char *)
422
			    * (size_t)(cmdline_argc + 2)));
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
423
      if(tmp == NULL){
424
	perror("realloc");
425
	free(cmdline_argv);
426
	return EXIT_FAILURE;
427
      }
428
      cmdline_argv = tmp;
429
      cmdline_argv[cmdline_argc] = cmdline + position;
430
      cmdline_argc++;
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
431
      position += strlen(cmdline + position) + 1;
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
432
    }
433
    cmdline_argv[cmdline_argc] = NULL;
434
  }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
435
  /* Kill old usplash */
436
    kill(usplash_pid, SIGTERM);
437
    sleep(2);
438
  while(kill(usplash_pid, 0) == 0){
439
    kill(usplash_pid, SIGKILL);
440
    sleep(1);
441
  }
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
442
  pid_t new_usplash_pid = fork();
443
  if(new_usplash_pid == 0){
444
    /* Child; will become new usplash process */
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
445
    
446
    /* Make the effective user ID (root) the only user ID instead of
447
       the real user ID (mandos) */
448
    ret = setuid(geteuid());
449
    if (ret == -1){
450
      perror("setuid");
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
451
    }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
452
    
453
    setsid();
454
    ret = chdir("/");
455
/*     if(fork() != 0){ */
456
/*       _exit(EXIT_SUCCESS); */
457
/*     } */
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
458
    ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
459
    if(ret == -1){
460
      perror("dup2");
461
      _exit(EXIT_FAILURE);
462
    }
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
463
    
464
    execv(usplash_name, cmdline_argv);
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
465
    perror("execv");
213 by Teddy Hogeborn
* plugins.d/usplash.c (main): Bug fix: Do not free "cmdline" too soon.
466
    free(cmdline);
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
467
    free(cmdline_argv);
468
    _exit(EXIT_FAILURE);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
469
  }
213 by Teddy Hogeborn
* plugins.d/usplash.c (main): Bug fix: Do not free "cmdline" too soon.
470
  free(cmdline);
212 by Teddy Hogeborn
* plugins.d/usplash.c (usplash_write): Move "cmd_line_len" up.
471
  free(cmdline_argv);
210 by Teddy Hogeborn
* debian/mandos-client.postinst: Change home directory to
472
  sleep(2);
473
  if(not usplash_write("PULSATE", NULL)
474
     and (errno != EINTR)){
475
    perror("usplash_write");
208 by Teddy Hogeborn
* Makefile (PLUGINS): Added "plugins.d/usplash".
476
  }
477
  
478
  return EXIT_FAILURE;
479
}