/mandos/trunk

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Viewing changes to plugins.d/splashy.c

  • Committer: Teddy Hogeborn
  • Date: 2008-09-26 04:54:35 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080926045435-0thnnqops1kzclag
* debian/mandos-client.postinst: Change home directory to
                                 "/nonexistent".
* debian/mandos.postinst: - '' -

* plugin-runner.c (main): Bug fix: Block signals while modifying
                          "plugin_list".

* plugins.d/usplash.c (usplash_write): New function.
  (main): Use "usplash_write" to write "INPUTQUIET" command.  Also
          write "TIMEOUT 0" before it, and write "TIMEOUT 15" and
          "PULSATE" if starting a new usplash process.  Kill old
          usplash before forking.  Bug fix: do setuid(geteuid()) to
          preserve genuine rootness.  Better interrupted/error logic
          overall.

* debian/mandos-client.lintian-overrides: Ignore setuid
                                          "plugins.d/usplash".

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Lines of Context:
plugins.d/splashy.c
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#define _GNU_SOURCE             /* asprintf() */
2
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#include <signal.h>             /* sig_atomic_t, struct sigaction,
3
 
                                   sigemptyset(), sigaddset(), SIGINT,
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                                   SIGHUP, SIGTERM, sigaction,
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                                   SIG_IGN, kill(), SIGKILL */
 
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                                   sigemptyset(), sigaddset(),
 
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                                   sigaction, SIGINT, SIG_IGN, SIGHUP,
 
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                                   SIGTERM, kill(), SIGKILL */
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#include <stddef.h>             /* NULL */
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#include <stdlib.h>             /* getenv() */
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#include <stdio.h>              /* asprintf(), perror() */
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#include <stdlib.h>             /* EXIT_FAILURE, free(), strtoul(),
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                                   EXIT_SUCCESS */
 
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#include <stdlib.h>             /* EXIT_FAILURE, EXIT_SUCCESS,
 
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                                   strtoul(), free() */
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#include <sys/types.h>          /* pid_t, DIR, struct dirent,
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                                   ssize_t */
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#include <dirent.h>             /* opendir(), readdir(), closedir() */
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#include <sys/stat.h>           /* struct stat, lstat(), S_ISLNK */
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#include <iso646.h>             /* not, or, and */
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#include <unistd.h>             /* readlink(), fork(), execl(),
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                                   sleep(), dup2() STDERR_FILENO,
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                                   STDOUT_FILENO, _exit() */
 
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                                   _exit */
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#include <string.h>             /* memcmp() */
 
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#include <iso646.h>             /* and */
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#include <errno.h>              /* errno */
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#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
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                                   WEXITSTATUS() */
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          closedir(proc_dir);
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          return EXIT_FAILURE;
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        }
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        /* Check that it refers to a symlink owned by root:root */
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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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          perror("lstat");
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          free(exe_link);
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          free(prompt);
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          closedir(proc_dir);
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          return EXIT_FAILURE;
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        }
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        if(not S_ISLNK(exe_stat.st_mode)
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           or exe_stat.st_uid != 0
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           or exe_stat.st_gid != 0){
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          free(exe_link);
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          continue;
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        }
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        sret = readlink(exe_link, exe_target, sizeof(exe_target));
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        free(exe_link);
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      }
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      free(prompt);
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      return EXIT_FAILURE;
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    }
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    if(old_action.sa_handler != SIG_IGN){
 
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    if (old_action.sa_handler != SIG_IGN){
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      ret = sigaction(SIGINT, &new_action, NULL);
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      if(ret == -1){
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        perror("sigaction");
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      free(prompt);
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      return EXIT_FAILURE;
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    }
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    if(old_action.sa_handler != SIG_IGN){
 
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    if (old_action.sa_handler != SIG_IGN){
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      ret = sigaction(SIGHUP, &new_action, NULL);
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      if(ret == -1){
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        perror("sigaction");
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      free(prompt);
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      return EXIT_FAILURE;
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    }
171
 
    if(old_action.sa_handler != SIG_IGN){
 
151
    if (old_action.sa_handler != SIG_IGN){
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      ret = sigaction(SIGTERM, &new_action, NULL);
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      if(ret == -1){
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        perror("sigaction");
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      const char splashy_command[] = "/sbin/splashy_update";
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      ret = execl(splashy_command, splashy_command, prompt,
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                  (char *)NULL);
196
 
      if(not interrupted_by_signal){
 
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      if(not interrupted_by_signal and errno != ENOENT){
 
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        /* Don't report "File not found", since splashy might not be
 
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           installed. */
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        perror("execl");
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      }
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      free(prompt);
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      _exit(EXIT_FAILURE);
 
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      return EXIT_FAILURE;
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    }
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  }
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  free(prompt);
206
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  /* Wait for command to complete */
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  if(not interrupted_by_signal and splashy_command_pid != 0){
209
 
    int status;
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    ret = waitpid(splashy_command_pid, &status, 0);
211
 
    if(ret == -1){
212
 
      if(errno != EINTR){
213
 
        perror("waitpid");
214
 
      }
215
 
      if(errno == ECHILD){
216
 
        splashy_command_pid = 0;
217
 
      }
218
 
    } else {
219
 
      /* The child process has exited */
220
 
      splashy_command_pid = 0;
221
 
      if(not interrupted_by_signal and WIFEXITED(status)
222
 
         and WEXITSTATUS(status)==0){
223
 
        return EXIT_SUCCESS;
224
 
      }
 
190
  int status;
 
191
  while(not interrupted_by_signal){
 
192
    waitpid(splashy_command_pid, &status, 0);
 
193
    if(not interrupted_by_signal
 
194
       and WIFEXITED(status) and WEXITSTATUS(status)==0){
 
195
      return EXIT_SUCCESS;
225
196
    }
226
197
  }
227
198
  kill(splashy_pid, SIGTERM);
228
 
  if(interrupted_by_signal and splashy_command_pid != 0){
 
199
  if(interrupted_by_signal){
229
200
    kill(splashy_command_pid, SIGTERM);
230
201
  }
231
 
  sleep(2);
232
 
  while(kill(splashy_pid, 0) == 0){
233
 
    kill(splashy_pid, SIGKILL);
234
 
    sleep(1);
235
 
  }
 
202
  
236
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  pid_t new_splashy_pid = fork();
237
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  if(new_splashy_pid == 0){
238
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    /* Child; will become new splashy process */
239
 
    
240
 
    /* Make the effective user ID (root) the only user ID instead of
241
 
       the real user ID (mandos) */
242
 
    ret = setuid(geteuid());
243
 
    if(ret == -1){
244
 
      perror("setuid");
 
206
    while(kill(splashy_pid, 0)){
 
207
      sleep(2);
 
208
      kill(splashy_pid, SIGKILL);
 
209
      sleep(1);
245
210
    }
246
 
    
247
 
    setsid();
248
 
    ret = chdir("/");
249
 
/*     if(fork() != 0){ */
250
 
/*       _exit(EXIT_SUCCESS); */
251
 
/*     } */
252
211
    ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
253
212
    if(ret == -1){
254
213
      perror("dup2");
255
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      _exit(EXIT_FAILURE);
256
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    }
257
 
    
258
216
    execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
259
 
    if(not interrupted_by_signal){
260
 
      perror("execl");
261
 
    }
262
 
    _exit(EXIT_FAILURE);
263
217
  }
264
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  return EXIT_FAILURE;