/mandos/release

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/release
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
1
#define _GNU_SOURCE		/* asprintf(), TEMP_FAILURE_RETRY() */
2
#include <signal.h>		/* sig_atomic_t, struct sigaction,
3
				   sigemptyset(), sigaddset(), SIGINT,
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				   SIGHUP, SIGTERM, sigaction(),
5
				   kill(), SIG_IGN */
6
#include <stdbool.h>		/* bool, false, true */
7
#include <fcntl.h>		/* open(), O_RDONLY */
8
#include <iso646.h>		/* and, or, not*/
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* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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#include <sys/types.h>		/* size_t, ssize_t, pid_t, struct
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				   dirent, waitpid() */
24.1.157 by Björn Påhlsson
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#include <sys/wait.h>		/* waitpid() */
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#include <stddef.h>		/* NULL */
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#include <string.h>		/* strchr(), memcmp() */
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* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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#include <stdio.h>		/* asprintf(), perror(), fopen(),
15
				   fscanf() */
16
#include <unistd.h>		/* close(), readlink(), read(),
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				   fork(), setsid(), chdir(), dup2(),
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				   STDERR_FILENO, execv(), access() */
19
#include <stdlib.h>		/* free(), EXIT_FAILURE, realloc(),
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				   EXIT_SUCCESS, malloc(), _exit(),
21
				   getenv() */
22
#include <dirent.h>		/* scandir(), alphasort() */
23
#include <inttypes.h>		/* intmax_t, strtoumax(), SCNuMAX */
24
#include <sys/stat.h>		/* struct stat, lstat() */
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* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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#include <sysexits.h>		/* EX_OSERR, EX_UNAVAILABLE */
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#include <error.h>		/* error() */
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#include <errno.h>		/* TEMP_FAILURE_RETRY */
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* debian/watch: Also watch for "*.tar.xz" files.
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#include <argz.h>		/* argz_count(), argz_extract() */
24.1.157 by Björn Påhlsson
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30
sig_atomic_t interrupted_by_signal = 0;
31
const char plymouth_pid[] = "/dev/.initramfs/plymouth.pid";
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const char plymouth_path[] = "/bin/plymouth";
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const char plymouthd_path[] = "/sbin/plymouthd";
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const char *plymouthd_default_argv[] = {"/sbin/plymouthd",
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					"--mode=boot",
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					"--attach-to-session",
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					"--pid-file="
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					"/dev/.initramfs/"
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					"plymouth.pid",
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					NULL };
41
42
static void termination_handler(__attribute__((unused))int signum){
43
  if(interrupted_by_signal){
44
    return;
45
  }
46
  interrupted_by_signal = 1;
47
}
48
49
/* Create prompt string */
50
char *makeprompt(void){
51
  int ret = 0;
52
  char *prompt;
53
  const char *const cryptsource = getenv("cryptsource");
54
  const char *const crypttarget = getenv("crypttarget");
55
  const char prompt_start[] = "Enter passphrase to unlock the disk";
56
  
57
  if(cryptsource == NULL){
58
    if(crypttarget == NULL){
59
      ret = asprintf(&prompt, "%s: ", prompt_start);
60
    } else {
61
      ret = asprintf(&prompt, "%s (%s): ", prompt_start,
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		     crypttarget);
63
    }
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  } else {
65
    if(crypttarget == NULL){
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      ret = asprintf(&prompt, "%s %s: ", prompt_start, cryptsource);
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    } else {
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      ret = asprintf(&prompt, "%s %s (%s): ", prompt_start,
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		     cryptsource, crypttarget);
70
    }
71
  }
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  if(ret == -1){
73
    return NULL;
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  }
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  return prompt;
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}
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void kill_and_wait(pid_t pid){
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  TEMP_FAILURE_RETRY(kill(pid, SIGTERM));
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  TEMP_FAILURE_RETRY(waitpid(pid, NULL, 0));
81
}
82
83
bool become_a_daemon(void){
84
  int ret = setuid(geteuid());
85
  if(ret == -1){
86
    error(0, errno, "setuid");
87
  }
88
    
89
  setsid();
90
  ret = chdir("/");
91
  if(ret == -1){
92
    error(0, errno, "chdir");
93
    return false;
94
  }
95
  ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
96
  if(ret == -1){
97
    error(0, errno, "dup2");
98
    return false;
99
  }
100
  return true;
101
}
102
103
bool exec_and_wait(pid_t *pid_return, const char *path,
104
		   const char **argv, bool interruptable,
105
		   bool daemonize){
106
  int status;
107
  int ret;
108
  pid_t pid;
109
  pid = fork();
110
  if(pid == -1){
111
    error(0, errno, "fork");
112
    return false;
113
  }
114
  if(pid == 0){
115
    /* Child */
116
    if(daemonize){
117
      if(not become_a_daemon()){
118
	_exit(EX_OSERR);
119
      }
120
    }
121
122
    char **new_argv = NULL;
123
    char *tmp;
124
    int i = 0;
125
    for (; argv[i]!=(char *)NULL; i++){
126
      tmp = realloc(new_argv, sizeof(const char *) * ((size_t)i + 1));
127
      if (tmp == NULL){
128
	error(0, errno, "realloc");
129
	free(new_argv);
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	_exit(EX_OSERR);
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      }
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      new_argv = (char **)tmp;
133
      new_argv[i] = strdup(argv[i]);
134
    }
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    new_argv[i] = (char *) NULL;
136
    
137
    execv(path, (char *const *)new_argv);
138
    error(0, errno, "execv");
139
    _exit(EXIT_FAILURE);
140
  }
141
  if(pid_return != NULL){
142
    *pid_return = pid;
143
  }
144
  do {
145
    ret = waitpid(pid, &status, 0);
146
  } while(ret == -1 and errno == EINTR
147
	  and ((not interrupted_by_signal)
148
	       or (not interruptable)));
149
  if(interrupted_by_signal and interruptable){
150
    return false;
151
  }
152
  if(ret == -1){
153
    error(0, errno, "waitpid");
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    return false;
155
  }
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  if(WIFEXITED(status) and (WEXITSTATUS(status) == 0)){
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    return true;
158
  }
159
  return false;
160
}
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162
int is_plymouth(const struct dirent *proc_entry){
163
  int ret;
164
  {
165
    uintmax_t maxvalue;
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    char *tmp;
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    errno = 0;
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    maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
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237.2.199 by teddy at bsnet
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    if(errno != 0 or *tmp != '\0'
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       or maxvalue != (uintmax_t)((pid_t)maxvalue)){
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      return 0;
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    }
174
  }
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  char exe_target[sizeof(plymouth_path)];
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  char *exe_link;
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  ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
178
  if(ret == -1){
179
    error(0, errno, "asprintf");
180
    return 0;
181
  }
237.2.199 by teddy at bsnet
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  struct stat exe_stat;
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  ret = lstat(exe_link, &exe_stat);
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  if(ret == -1){
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    free(exe_link);
187
    if(errno != ENOENT){
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      error(0, errno, "lstat");
189
    }
190
    return 0;
191
  }
192
  
193
  if(not S_ISLNK(exe_stat.st_mode)
194
     or exe_stat.st_uid != 0
195
     or exe_stat.st_gid != 0){
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    free(exe_link);
197
    return 0;
198
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
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  ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
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  free(exe_link);
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  if((sret != (ssize_t)sizeof(plymouth_path)-1) or
203
      (memcmp(plymouth_path, exe_target,
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	      sizeof(plymouth_path)-1) != 0)){
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    return 0;
206
  }
207
  return 1;
208
}
209
210
pid_t get_pid(void){
211
  int ret;
212
  FILE *pidfile = fopen(plymouth_pid, "r");
213
  uintmax_t maxvalue = 0;
214
  if(pidfile != NULL){
215
    ret = fscanf(pidfile, "%" SCNuMAX, &maxvalue);
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    if(ret != 1){
217
      maxvalue = 0;
218
    }
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    fclose(pidfile);
220
  }
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  if(maxvalue == 0){
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    struct dirent **direntries;
223
    ret = scandir("/proc", &direntries, is_plymouth, alphasort);
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    sscanf(direntries[0]->d_name, "%" SCNuMAX, &maxvalue);
225
  }
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  pid_t pid;
227
  pid = (pid_t)maxvalue;
228
  if((uintmax_t)pid == maxvalue){
229
    return pid;
230
  }
231
  
232
  return 0;
233
}
234
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const char **getargv(pid_t pid){
236
  int cl_fd;
237
  char *cmdline_filename;
238
  ssize_t sret;
239
  int ret;
240
  
241
  ret = asprintf(&cmdline_filename, "/proc/%" PRIuMAX "/cmdline",
242
		 (uintmax_t)pid);
243
  if(ret == -1){
244
    error(0, errno, "asprintf");
245
    return NULL;
246
  }
247
  
248
  /* Open /proc/<pid>/cmdline  */
249
  cl_fd = open(cmdline_filename, O_RDONLY);
250
  free(cmdline_filename);
251
  if(cl_fd == -1){
252
    error(0, errno, "open");
253
    return NULL;
254
  }
255
  
256
  size_t cmdline_allocated = 0;
257
  size_t cmdline_len = 0;
258
  char *cmdline = NULL;
259
  char *tmp;
260
  const size_t blocksize = 1024;
261
  do {
262
    /* Allocate more space? */
263
    if(cmdline_len + blocksize > cmdline_allocated){
264
      tmp = realloc(cmdline, cmdline_allocated + blocksize);
265
      if(tmp == NULL){
266
	error(0, errno, "realloc");
267
	free(cmdline);
268
	close(cl_fd);
269
	return NULL;
270
      }
271
      cmdline = tmp;
272
      cmdline_allocated += blocksize;
273
    }
274
    
275
    /* Read data */
276
    sret = read(cl_fd, cmdline + cmdline_len,
277
		cmdline_allocated - cmdline_len);
278
    if(sret == -1){
279
      error(0, errno, "read");
280
      free(cmdline);
281
      close(cl_fd);
282
      return NULL;
283
    }
284
    cmdline_len += (size_t)sret;
285
  } while(sret != 0);
286
  ret = close(cl_fd);
287
  if(ret == -1){
288
    error(0, errno, "close");
289
    free(cmdline);
290
    return NULL;
291
  }
292
  
293
  /* 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
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  char **argv = malloc((argz_count(cmdline, cmdline_len) + 1)
237.2.194 by teddy at bsnet
* debian/watch: Also watch for "*.tar.xz" files.
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		       * sizeof(char *)); /* Get number of args */
296
  if(argv == NULL){
297
    error(0, errno, "argv = malloc()");
298
    free(cmdline);
299
    return NULL;
24.1.157 by Björn Påhlsson
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  }
237.2.194 by teddy at bsnet
* debian/watch: Also watch for "*.tar.xz" files.
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  argz_extract(cmdline, cmdline_len, argv); /* Create argv */
302
  return (const char **)argv;
24.1.157 by Björn Påhlsson
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}
304
305
int main(__attribute__((unused))int argc,
306
	 __attribute__((unused))char **argv){
307
  char *prompt;
308
  char *prompt_arg;
309
  pid_t plymouth_command_pid;
310
  int ret;
311
  bool bret;
312
313
  /* test -x /bin/plymouth */
314
  ret = access(plymouth_path, X_OK);
315
  if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
316
    /* Plymouth is probably not installed.  Don't print an error
317
       message, just exit. */
318
    exit(EX_UNAVAILABLE);
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  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
320
  
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  { /* Add signal handlers */
322
    struct sigaction old_action,
323
      new_action = { .sa_handler = termination_handler,
324
		     .sa_flags = 0 };
325
    sigemptyset(&new_action.sa_mask);
237.2.199 by teddy at bsnet
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326
    for(int *sig = (int[]){ SIGINT, SIGHUP, SIGTERM, 0 };
327
	*sig != 0; sig++){
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      ret = sigaddset(&new_action.sa_mask, *sig);
329
      if(ret == -1){
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330
	error(EX_OSERR, errno, "sigaddset");
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      }
332
      ret = sigaction(*sig, NULL, &old_action);
333
      if(ret == -1){
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* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
334
	error(EX_OSERR, errno, "sigaction");
24.1.157 by Björn Påhlsson
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      }
336
      if(old_action.sa_handler != SIG_IGN){
337
	ret = sigaction(*sig, &new_action, NULL);
338
	if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
339
	  error(EX_OSERR, errno, "sigaction");
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	}
341
      }
342
    }
343
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
344
  
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
345
  /* plymouth --ping */
346
  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
347
		       (const char *[])
348
		       { plymouth_path, "--ping", NULL },
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		       true, false);
350
  if(not bret){
351
    if(interrupted_by_signal){
352
      kill_and_wait(plymouth_command_pid);
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* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
353
      exit(EXIT_FAILURE);
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    }
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* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
355
    /* Plymouth is probably not running.  Don't print an error
356
       message, just exit. */
357
    exit(EX_UNAVAILABLE);
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358
  }
359
  
360
  prompt = makeprompt();
361
  ret = asprintf(&prompt_arg, "--prompt=%s", prompt);
362
  free(prompt);
363
  if(ret == -1){
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
364
    error(EX_OSERR, errno, "asprintf");
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365
  }
366
  
367
  /* plymouth ask-for-password --prompt="$prompt" */
237.2.199 by teddy at bsnet
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368
  bret = exec_and_wait(&plymouth_command_pid,
369
		       plymouth_path, (const char *[])
370
		       { plymouth_path, "ask-for-password",
371
			   prompt_arg, NULL },
24.1.157 by Björn Påhlsson
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372
		       true, false);
373
  free(prompt_arg);
374
  if(bret){
375
    exit(EXIT_SUCCESS);
376
  }
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
377
  if(not interrupted_by_signal){
378
    /* exec_and_wait failed for some other reason */
379
    exit(EXIT_FAILURE);
380
  }
381
  kill_and_wait(plymouth_command_pid);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
382
  
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
383
  const char **plymouthd_argv;
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384
  pid_t pid = get_pid();
385
  if(pid == 0){
386
    error(0, 0, "plymouthd pid not found");
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
387
    plymouthd_argv = plymouthd_default_argv;
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388
  } else {
389
    plymouthd_argv = getargv(pid);
390
  }
391
  
237.2.199 by teddy at bsnet
* plugins.d/plymouth.c: Break lines, fix whitespace. Remove
392
  bret = exec_and_wait(NULL, plymouth_path, (const char *[])
393
		       { plymouth_path, "quit", NULL },
394
		       false, false);
395
  if(not bret){
396
    exit(EXIT_FAILURE);
397
  }
398
  bret = exec_and_wait(NULL, plymouthd_path, plymouthd_argv,
399
		       false, true);
400
  if(not bret){
401
    exit(EXIT_FAILURE);
402
  }
403
  exec_and_wait(NULL, plymouth_path, (const char *[])
404
		{ plymouth_path, "show-splash", NULL },
405
		false, false);
24.1.157 by Björn Påhlsson
added the actually plugin file for plymouth
406
  exit(EXIT_FAILURE);
407
}