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Viewing changes to plugins.d/password-prompt.c

  • Committer: teddy at bsnet
  • Date: 2010-09-27 18:57:12 UTC
  • Revision ID: teddy@fukt.bsnet.se-20100927185712-d4t34t3y002xr44x
* mandos-clients.conf.xml (EXPANSION/RUNTIME EXPANSION): List possible
                                                         keys.

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plugins.d/password-prompt.c
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 * Contact the authors at <mandos@fukt.bsnet.se>.
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 */
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#define _GNU_SOURCE             /* getline(), asprintf() */
 
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#define _GNU_SOURCE             /* getline() */
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#include <termios.h>            /* struct termios, tcsetattr(),
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                                   TCSAFLUSH, tcgetattr(), ECHO */
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#include <unistd.h>             /* struct termios, tcsetattr(),
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                                   STDIN_FILENO, TCSAFLUSH,
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                                   tcgetattr(), ECHO, readlink() */
 
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                                   tcgetattr(), ECHO */
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#include <signal.h>             /* sig_atomic_t, raise(), struct
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                                   sigaction, sigemptyset(),
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                                   sigaction(), sigaddset(), SIGINT,
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                                   SIGQUIT, SIGHUP, SIGTERM,
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                                   raise() */
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#include <stddef.h>             /* NULL, size_t, ssize_t */
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#include <sys/types.h>          /* ssize_t, struct dirent, pid_t, ssize_t */
 
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#include <sys/types.h>          /* ssize_t */
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#include <stdlib.h>             /* EXIT_SUCCESS, EXIT_FAILURE,
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                                   getenv(), free() */
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#include <dirent.h>             /* scandir(), alphasort() */
 
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                                   getenv() */
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#include <stdio.h>              /* fprintf(), stderr, getline(),
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                                   stdin, feof(), fputc()
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                                */
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#include <error.h>              /* error() */
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#include <iso646.h>             /* or, not */
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#include <stdbool.h>            /* bool, false, true */
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#include <inttypes.h>           /* strtoumax() */
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#include <sys/stat.h>           /* struct stat, lstat() */
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#include <string.h>             /* strlen, rindex, memcmp */
 
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#include <string.h>             /* strlen, rindex */
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#include <argp.h>               /* struct argp_option, struct
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                                   argp_state, struct argp,
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                                   argp_parse(), error_t,
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const char *argp_program_version = "password-prompt " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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/* Needed for conflic resolution */
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const char plymouthd_path[] = "/sbin/plymouth";
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static void termination_handler(int signum){
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  if(quit_now){
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    return;
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  signal_received = signum;
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}
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bool conflict_detection(void){
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  /* plymouth conflicts with password-promt since both want to control the
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     associated terminal. Password-prompt exit since plymouth perferms the same
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     functionallity.
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   */
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  int is_plymouth(const struct dirent *proc_entry){
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    int ret;
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    {
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      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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      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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      }
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    }
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    char exe_target[sizeof(plymouthd_path)];
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    char *exe_link;
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    ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
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    if(ret == -1){
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      error(0, errno, "asprintf");
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      return 0;
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    }
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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);
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      if(errno != ENOENT){
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        error(0, errno, "lstat");
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      }
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      return 0;
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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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      return 0;
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    }
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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(plymouthd_path)-1) or
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       (memcmp(plymouthd_path, exe_target,
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               sizeof(plymouthd_path)-1) != 0)){
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      return 0;
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    }
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    return 1;
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  }
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  struct dirent **direntries;
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  int ret;
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  ret = scandir("/proc", &direntries, is_plymouth, alphasort);
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  if (ret == -1){
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    error(1, errno, "scandir");
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  }
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  if (ret < 0){
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    return 1;
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  } else {
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    return 0;
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  }
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}
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int main(int argc, char **argv){
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  ssize_t sret;
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  int ret;
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  if(debug){
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    fprintf(stderr, "Starting %s\n", argv[0]);
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  }
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  if (conflict_detection()){
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    if(debug){
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      fprintf(stderr, "Stopping %s because of conflict", argv[0]);
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    }
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    return EXIT_FAILURE;
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  }
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  if(debug){
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    fprintf(stderr, "Storing current terminal attributes\n");
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  }