/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release
237.2.207 by Teddy Hogeborn
Update copyright year to "2010" wherever appropriate.
1
/*  -*- coding: utf-8 -*- */
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/*
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
3
 * Plymouth - Read a password from Plymouth and output it
237.2.207 by Teddy Hogeborn
Update copyright year to "2010" wherever appropriate.
4
 * 
5
 * Copyright © 2010 Teddy Hogeborn
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 * Copyright © 2010 Björn Påhlsson
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 * 
8
 * This program is free software: you can redistribute it and/or
9
 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation, either version 3 of the
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 * License, or (at your option) any later version.
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 * 
13
 * This program is distributed in the hope that it will be useful, but
14
 * WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * General Public License for more details.
17
 * 
18
 * You should have received a copy of the GNU General Public License
19
 * along with this program.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 * 
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 * Contact the authors at <mandos@fukt.bsnet.se>.
23
 */
24
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
25
#define _GNU_SOURCE		/* asprintf(), TEMP_FAILURE_RETRY() */
26
#include <signal.h>		/* sig_atomic_t, struct sigaction,
27
				   sigemptyset(), sigaddset(), SIGINT,
28
				   SIGHUP, SIGTERM, sigaction(),
29
				   kill(), SIG_IGN */
30
#include <stdbool.h>		/* bool, false, true */
31
#include <fcntl.h>		/* open(), O_RDONLY */
32
#include <iso646.h>		/* and, or, not*/
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
33
#include <sys/types.h>		/* size_t, ssize_t, pid_t, struct
34
				   dirent, waitpid() */
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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#include <sys/wait.h>		/* waitpid() */
36
#include <stddef.h>		/* NULL */
37
#include <string.h>		/* strchr(), memcmp() */
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
38
#include <stdio.h>		/* asprintf(), perror(), fopen(),
39
				   fscanf() */
40
#include <unistd.h>		/* close(), readlink(), read(),
41
				   fork(), setsid(), chdir(), dup2(),
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
42
				   STDERR_FILENO, execv(), access() */
43
#include <stdlib.h>		/* free(), EXIT_FAILURE, realloc(),
44
				   EXIT_SUCCESS, malloc(), _exit(),
45
				   getenv() */
46
#include <dirent.h>		/* scandir(), alphasort() */
47
#include <inttypes.h>		/* intmax_t, strtoumax(), SCNuMAX */
48
#include <sys/stat.h>		/* struct stat, lstat() */
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
49
#include <sysexits.h>		/* EX_OSERR, EX_UNAVAILABLE */
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
50
#include <error.h>		/* error() */
51
#include <errno.h>		/* TEMP_FAILURE_RETRY */
237.2.194 by teddy at bsnet
* debian/watch: Also watch for "*.tar.xz" files.
52
#include <argz.h>		/* argz_count(), argz_extract() */
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
53
54
sig_atomic_t interrupted_by_signal = 0;
55
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
56
const char plymouth_path[] = "/bin/plymouth";
57
const char plymouthd_path[] = "/sbin/plymouthd";
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
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					"--mode=boot",
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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					"--attach-to-session",
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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					"--pid-file="
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					"/dev/.initramfs/"
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					"plymouth.pid",
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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					NULL };
65
66
static void termination_handler(__attribute__((unused))int signum){
67
  if(interrupted_by_signal){
68
    return;
69
  }
70
  interrupted_by_signal = 1;
71
}
72
73
/* Create prompt string */
74
char *makeprompt(void){
75
  int ret = 0;
76
  char *prompt;
77
  const char *const cryptsource = getenv("cryptsource");
78
  const char *const crypttarget = getenv("crypttarget");
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
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  const char prompt_start[] = "Unlocking the disk";
80
  const char prompt_end[] = "Enter passphrase";
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
81
  
82
  if(cryptsource == NULL){
83
    if(crypttarget == NULL){
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
84
      ret = asprintf(&prompt, "%s\n%s", prompt_start, prompt_end);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
85
    } else {
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
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      ret = asprintf(&prompt, "%s (%s)\n%s", prompt_start,
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		     crypttarget, prompt_end);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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    }
89
  } else {
90
    if(crypttarget == NULL){
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
91
      ret = asprintf(&prompt, "%s %s\n%s", prompt_start, cryptsource,
92
		     prompt_end);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
93
    } else {
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
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      ret = asprintf(&prompt, "%s %s (%s)\n%s", prompt_start,
95
		     cryptsource, crypttarget, prompt_end);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
96
    }
97
  }
98
  if(ret == -1){
99
    return NULL;
100
  }
101
  return prompt;
102
}
103
104
void kill_and_wait(pid_t pid){
105
  TEMP_FAILURE_RETRY(kill(pid, SIGTERM));
106
  TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
107
}
108
109
bool become_a_daemon(void){
110
  int ret = setuid(geteuid());
111
  if(ret == -1){
112
    error(0, errno, "setuid");
113
  }
114
    
115
  setsid();
116
  ret = chdir("/");
117
  if(ret == -1){
118
    error(0, errno, "chdir");
119
    return false;
120
  }
121
  ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
122
  if(ret == -1){
123
    error(0, errno, "dup2");
124
    return false;
125
  }
126
  return true;
127
}
128
129
bool exec_and_wait(pid_t *pid_return, const char *path,
130
		   const char **argv, bool interruptable,
131
		   bool daemonize){
132
  int status;
133
  int ret;
134
  pid_t pid;
135
  pid = fork();
136
  if(pid == -1){
137
    error(0, errno, "fork");
138
    return false;
139
  }
140
  if(pid == 0){
141
    /* Child */
142
    if(daemonize){
143
      if(not become_a_daemon()){
144
	_exit(EX_OSERR);
145
      }
146
    }
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
147
    
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
148
    char **new_argv = NULL;
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
149
    char **tmp;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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    int i = 0;
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
151
    for (; argv[i]!=NULL; i++){
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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      tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
153
      if (tmp == NULL){
154
	error(0, errno, "realloc");
155
	free(new_argv);
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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	_exit(EX_OSERR);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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      }
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
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      new_argv = tmp;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
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      new_argv[i] = strdup(argv[i]);
160
    }
237.7.10 by Teddy Hogeborn
* plugins.d/plymouth.c: Fixed comment to "Plymouth" instead of "Usplash".
161
    new_argv[i] = NULL;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
162
    
163
    execv(path, (char *const *)new_argv);
164
    error(0, errno, "execv");
165
    _exit(EXIT_FAILURE);
166
  }
167
  if(pid_return != NULL){
168
    *pid_return = pid;
169
  }
170
  do {
171
    ret = waitpid(pid, &status, 0);
172
  } while(ret == -1 and errno == EINTR
173
	  and ((not interrupted_by_signal)
174
	       or (not interruptable)));
175
  if(interrupted_by_signal and interruptable){
176
    return false;
177
  }
178
  if(ret == -1){
179
    error(0, errno, "waitpid");
180
    return false;
181
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
182
  if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
183
    return true;
184
  }
185
  return false;
186
}
187
188
int is_plymouth(const struct dirent *proc_entry){
189
  int ret;
190
  {
191
    uintmax_t maxvalue;
192
    char *tmp;
193
    errno = 0;
194
    maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
195
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
196
    if(errno != 0 or *tmp != '\0'
197
       or maxvalue != (uintmax_t)((pid_t)maxvalue)){
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
198
      return 0;
199
    }
200
  }
201
  char exe_target[sizeof(plymouth_path)];
202
  char *exe_link;
203
  ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
204
  if(ret == -1){
205
    error(0, errno, "asprintf");
206
    return 0;
207
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
208
  
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
209
  struct stat exe_stat;
210
  ret = lstat(exe_link, &exe_stat);
211
  if(ret == -1){
212
    free(exe_link);
213
    if(errno != ENOENT){
214
      error(0, errno, "lstat");
215
    }
216
    return 0;
217
  }
218
  
219
  if(not S_ISLNK(exe_stat.st_mode)
220
     or exe_stat.st_uid != 0
221
     or exe_stat.st_gid != 0){
222
    free(exe_link);
223
    return 0;
224
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
225
  
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
226
  ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
227
  free(exe_link);
228
  if((sret != (ssize_t)sizeof(plymouth_path)-1) or
229
      (memcmp(plymouth_path, exe_target,
230
	      sizeof(plymouth_path)-1) != 0)){
231
    return 0;
232
  }
233
  return 1;
234
}
235
236
pid_t get_pid(void){
237
  int ret;
238
  FILE *pidfile = fopen(plymouth_pid, "r");
239
  uintmax_t maxvalue = 0;
240
  if(pidfile != NULL){
241
    ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
242
    if(ret != 1){
243
      maxvalue = 0;
244
    }
245
    fclose(pidfile);
246
  }
247
  if(maxvalue == 0){
248
    struct dirent **direntries;
249
    ret = scandir("/proc", &direntries, is_plymouth, alphasort);
250
    sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
251
  }
252
  pid_t pid;
253
  pid = (pid_t)maxvalue;
254
  if((uintmax_t)pid == maxvalue){
255
    return pid;
256
  }
257
  
258
  return 0;
259
}
260
261
const char **getargv(pid_t pid){
262
  int cl_fd;
263
  char *cmdline_filename;
264
  ssize_t sret;
265
  int ret;
266
  
267
  ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
268
		 (uintmax_t)pid);
269
  if(ret == -1){
270
    error(0, errno, "asprintf");
271
    return NULL;
272
  }
273
  
274
  /* Open /proc/<pid>/cmdline  */
275
  cl_fd = open(cmdline_filename, O_RDONLY);
276
  free(cmdline_filename);
277
  if(cl_fd == -1){
278
    error(0, errno, "open");
279
    return NULL;
280
  }
281
  
282
  size_t cmdline_allocated = 0;
283
  size_t cmdline_len = 0;
284
  char *cmdline = NULL;
285
  char *tmp;
286
  const size_t blocksize = 1024;
287
  do {
288
    /* Allocate more space? */
289
    if(cmdline_len + blocksize > cmdline_allocated){
290
      tmp = realloc(cmdline, cmdline_allocated + blocksize);
291
      if(tmp == NULL){
292
	error(0, errno, "realloc");
293
	free(cmdline);
294
	close(cl_fd);
295
	return NULL;
296
      }
297
      cmdline = tmp;
298
      cmdline_allocated += blocksize;
299
    }
300
    
301
    /* Read data */
302
    sret = read(cl_fd, cmdline + cmdline_len,
303
		cmdline_allocated - cmdline_len);
304
    if(sret == -1){
305
      error(0, errno, "read");
306
      free(cmdline);
307
      close(cl_fd);
308
      return NULL;
309
    }
310
    cmdline_len += (size_t)sret;
311
  } while(sret != 0);
312
  ret = close(cl_fd);
313
  if(ret == -1){
314
    error(0, errno, "close");
315
    free(cmdline);
316
    return NULL;
317
  }
318
  
319
  /* we got cmdline and cmdline_len, ignore rest... */
237.2.195 by teddy at bsnet
* plugins.d/usplash.c (main): BUG FIX: allocate space for the final
320
  char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
237.2.194 by teddy at bsnet
* debian/watch: Also watch for "*.tar.xz" files.
321
		       * sizeof(char *)); /* Get number of args */
322
  if(argv == NULL){
323
    error(0, errno, "argv = malloc()");
324
    free(cmdline);
325
    return NULL;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
326
  }
237.2.194 by teddy at bsnet
* debian/watch: Also watch for "*.tar.xz" files.
327
  argz_extract(cmdline, cmdline_len, argv); /* Create argv */
328
  return (const char **)argv;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
329
}
330
331
int main(__attribute__((unused))int argc,
332
	 __attribute__((unused))char **argv){
333
  char *prompt;
334
  char *prompt_arg;
335
  pid_t plymouth_command_pid;
336
  int ret;
337
  bool bret;
338
339
  /* test -x /bin/plymouth */
340
  ret = access(plymouth_path, X_OK);
341
  if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
342
    /* Plymouth is probably not installed.  Don't print an error
343
       message, just exit. */
344
    exit(EX_UNAVAILABLE);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
345
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
346
  
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
347
  { /* Add signal handlers */
348
    struct sigaction old_action,
349
      new_action = { .sa_handler = termination_handler,
350
		     .sa_flags = 0 };
351
    sigemptyset(&new_action.sa_mask);
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
352
    for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
353
	*sig != 0; sig++){
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
354
      ret = sigaddset(&new_action.sa_mask, *sig);
355
      if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
356
	error(EX_OSERR, errno, "sigaddset");
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
357
      }
358
      ret = sigaction(*sig, NULL, &old_action);
359
      if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
360
	error(EX_OSERR, errno, "sigaction");
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
361
      }
362
      if(old_action.sa_handler != SIG_IGN){
363
	ret = sigaction(*sig, &new_action, NULL);
364
	if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
365
	  error(EX_OSERR, errno, "sigaction");
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
366
	}
367
      }
368
    }
369
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
370
  
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
371
  /* plymouth --ping */
372
  bret = exec_and_wait(&plymouth_command_pid, plymouth_path,
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
373
		       (const char *[])
374
		       { plymouth_path, "--ping", NULL },
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
375
		       true, false);
376
  if(not bret){
377
    if(interrupted_by_signal){
378
      kill_and_wait(plymouth_command_pid);
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
379
      exit(EXIT_FAILURE);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
380
    }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
381
    /* Plymouth is probably not running.  Don't print an error
382
       message, just exit. */
383
    exit(EX_UNAVAILABLE);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
384
  }
385
  
386
  prompt = makeprompt();
387
  ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
388
  free(prompt);
389
  if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
390
    error(EX_OSERR, errno, "asprintf");
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
391
  }
392
  
393
  /* plymouth ask-for-password --prompt="$prompt" */
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
394
  bret = exec_and_wait(&plymouth_command_pid,
395
		       plymouth_path, (const char *[])
396
		       { plymouth_path, "ask-for-password",
397
			   prompt_arg, NULL },
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
398
		       true, false);
399
  free(prompt_arg);
400
  if(bret){
401
    exit(EXIT_SUCCESS);
402
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
403
  if(not interrupted_by_signal){
404
    /* exec_and_wait failed for some other reason */
405
    exit(EXIT_FAILURE);
406
  }
407
  kill_and_wait(plymouth_command_pid);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
408
  
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
409
  const char **plymouthd_argv;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
410
  pid_t pid = get_pid();
411
  if(pid == 0){
412
    error(0, 0, "plymouthd pid not found");
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
413
    plymouthd_argv = plymouthd_default_argv;
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
414
  } else {
415
    plymouthd_argv = getargv(pid);
416
  }
417
  
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
418
  bret = exec_and_wait(NULL, plymouth_path, (const char *[])
419
		       { plymouth_path, "quit", NULL },
420
		       false, false);
421
  if(not bret){
422
    exit(EXIT_FAILURE);
423
  }
424
  bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
425
		       false, true);
426
  if(not bret){
427
    exit(EXIT_FAILURE);
428
  }
429
  exec_and_wait(NULL, plymouth_path, (const char *[])
430
		{ plymouth_path, "show-splash", NULL },
431
		false, false);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
432
  exit(EXIT_FAILURE);
433
}