/mandos/release

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Viewing changes to plugins.d/splashy.c

  • Committer: Teddy Hogeborn
  • Date: 2008-10-04 20:09:53 UTC
  • Revision ID: teddy@fukt.bsnet.se-20081004200953-7j0fjlq6fqsxs9t2
* Makefile (DOCS): Added "plugins.d/askpass-fifo.8mandos".
  (install-client-nokey): Also install
                          "plugins.d/askpass-fifo.8mandos".
  (uninstall-client): Also uninstall "plugins.d/askpass-fifo.8mandos".

* plugins.d/askpass-fifo.xml: New.

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plugins.d/splashy.c
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#define _GNU_SOURCE             /* asprintf() */
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#include <signal.h>             /* sig_atomic_t, struct sigaction,
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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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                                   sigemptyset(), sigaddset(), SIGINT,
 
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                                   SIGHUP, SIGTERM, sigaction,
 
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                                   SIG_IGN, 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, EXIT_SUCCESS,
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                                   strtoul(), free() */
 
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#include <stdlib.h>             /* EXIT_FAILURE, free(), strtoul(),
 
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                                   EXIT_SUCCESS */
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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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                                   _exit */
 
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                                   sleep(), dup2() STDERR_FILENO,
 
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                                   STDOUT_FILENO, _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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  interrupted_by_signal = 1;
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}
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int main(__attribute__((unused))int argc, char **argv){
 
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int main(__attribute__((unused))int argc,
 
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         __attribute__((unused))char **argv){
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  int ret = 0;
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  /* Create prompt string */
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      }
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      /* Find the executable name by doing readlink() on the
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         /proc/<pid>/exe link */
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      char *exe_link;
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      ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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      if(ret == -1){
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        perror("asprintf");
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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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      char exe_target[sizeof(splashy_name)];
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      ssize_t sret = readlink(exe_link, exe_target,
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                              sizeof(exe_target));
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      free(exe_link);
 
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      ssize_t sret;
 
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      {
 
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        char *exe_link;
 
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        ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
 
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        if(ret == -1){
 
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          perror("asprintf");
 
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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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        /* 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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      if((sret == ((ssize_t)sizeof(exe_target)-1))
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         and (memcmp(splashy_name, exe_target,
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                     sizeof(exe_target)-1) == 0)){
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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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    }
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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(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);
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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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      if(not interrupted_by_signal){
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        perror("execl");
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      }
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      free(prompt);
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      return EXIT_FAILURE;
 
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      _exit(EXIT_FAILURE);
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    }
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  }
182
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184
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  free(prompt);
185
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  /* Wait for command to complete */
187
 
  int status;
188
 
  while(not interrupted_by_signal){
189
 
    waitpid(splashy_command_pid, &status, 0);
190
 
    if(not interrupted_by_signal
191
 
       and WIFEXITED(status) and WEXITSTATUS(status)==0){
192
 
      return EXIT_SUCCESS;
 
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  if(not interrupted_by_signal and splashy_command_pid != 0){
 
209
    int status;
 
210
    ret = waitpid(splashy_command_pid, &status, 0);
 
211
    if(ret == -1){
 
212
      if(errno != EINTR){
 
213
        perror("waitpid");
 
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      }
 
215
      if(errno == ECHILD){
 
216
        splashy_command_pid = 0;
 
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      }
 
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    } else {
 
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      /* The child process has exited */
 
220
      splashy_command_pid = 0;
 
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      if(not interrupted_by_signal and WIFEXITED(status)
 
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         and WEXITSTATUS(status)==0){
 
223
        return EXIT_SUCCESS;
 
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      }
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    }
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  }
195
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  kill(splashy_pid, SIGTERM);
196
 
  if(interrupted_by_signal){
 
228
  if(interrupted_by_signal and splashy_command_pid != 0){
197
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    kill(splashy_command_pid, SIGTERM);
198
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  }
199
 
  
 
231
  sleep(2);
 
232
  while(kill(splashy_pid, 0) == 0){
 
233
    kill(splashy_pid, SIGKILL);
 
234
    sleep(1);
 
235
  }
200
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  pid_t new_splashy_pid = fork();
201
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  if(new_splashy_pid == 0){
202
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    /* Child; will become new splashy process */
203
 
    while(kill(splashy_pid, 0)){
204
 
      sleep(2);
205
 
      kill(splashy_pid, SIGKILL);
206
 
      sleep(1);
 
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");
207
245
    }
 
246
    
 
247
    setsid();
 
248
    ret = chdir("/");
 
249
/*     if(fork() != 0){ */
 
250
/*       _exit(EXIT_SUCCESS); */
 
251
/*     } */
208
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    ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
209
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    if(ret == -1){
210
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      perror("dup2");
211
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      _exit(EXIT_FAILURE);
212
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    }
 
257
    
213
258
    execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
 
259
    if(not interrupted_by_signal){
 
260
      perror("execl");
 
261
    }
 
262
    _exit(EXIT_FAILURE);
214
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  }
215
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  return EXIT_FAILURE;