/mandos/release

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

* plugins.d/password-prompt.c (conflict_detection): Check for both
                                                    "plymouth" and
                                                    "plymouthd".

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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() */
 
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#define _GNU_SOURCE             /* getline(), asprintf() */
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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 */
 
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                                   tcgetattr(), ECHO, readlink() */
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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 */
 
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#include <sys/types.h>          /* ssize_t, struct dirent, pid_t,
 
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                                   ssize_t, open() */
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#include <stdlib.h>             /* EXIT_SUCCESS, EXIT_FAILURE,
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                                   getenv() */
 
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                                   getenv(), free() */
 
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#include <dirent.h>             /* scandir(), alphasort() */
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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 <string.h>             /* strlen, rindex */
 
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#include <inttypes.h>           /* strtoumax() */
 
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#include <sys/stat.h>           /* struct stat, lstat(), open() */
 
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#include <string.h>             /* strlen, rindex, memcmp */
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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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                                   ARGP_ERR_UNKNOWN */
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#include <sysexits.h>           /* EX_SOFTWARE, EX_OSERR,
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                                   EX_UNAVAILABLE, EX_IOERR, EX_OK */
 
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#include <fcntl.h>              /* open() */
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volatile sig_atomic_t quit_now = 0;
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int signal_received;
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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 conflict resolution */
 
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const char plymouth_name[] = "plymouthd";
 
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const char plymouth_alt_name[] = "plymouthd";
 
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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-prompt since both want to read
 
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     from the terminal.  Password-prompt will exit if it detects
 
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     plymouth since plymouth performs the same functionality.
 
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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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    int cl_fd;
 
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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 *cmdline_filename;
 
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    ret = asprintf(&cmdline_filename, "/proc/%s/cmdline", 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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    /* Open /proc/<pid>/cmdline  */
 
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    cl_fd = open(cmdline_filename, O_RDONLY);
 
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    free(cmdline_filename);
 
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    if(cl_fd == -1){
 
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      error(0, errno, "open");
 
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      return 0;
 
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    }
 
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    char *cmdline = NULL;
 
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    {
 
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      size_t cmdline_len = 0;
 
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      size_t cmdline_allocated = 0;
 
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      char *tmp;
 
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      const size_t blocksize = 1024;
 
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      ssize_t sret;
 
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      do {
 
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        /* Allocate more space? */
 
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        if(cmdline_len + blocksize + 1 > cmdline_allocated){
 
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          tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
 
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          if(tmp == NULL){
 
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            error(0, errno, "realloc");
 
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            free(cmdline);
 
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            close(cl_fd);
 
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            return 0;
 
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          }
 
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          cmdline = tmp;
 
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          cmdline_allocated += blocksize;
 
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        }
 
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        /* Read data */
 
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        sret = read(cl_fd, cmdline + cmdline_len,
 
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                    cmdline_allocated - cmdline_len);
 
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        if(sret == -1){
 
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          error(0, errno, "read");
 
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          free(cmdline);
 
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          close(cl_fd);
 
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          return 0;
 
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        }
 
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        cmdline_len += (size_t)sret;
 
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      } while(sret != 0);
 
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      ret = close(cl_fd);
 
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      if(ret == -1){
 
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        error(0, errno, "close");
 
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        free(cmdline);
 
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        return 0;
 
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      }
 
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      cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
 
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    }
 
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    /* we now have cmdline */
 
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    /* get basename */
 
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    char *cmdline_base = strrchr(cmdline, '/');
 
163
    if(cmdline_base != NULL){
 
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      cmdline_base += 1;                /* skip the slash */
 
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    } else {
 
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      cmdline_base = cmdline;
 
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    }
 
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    if((strcmp(cmdline_base, plymouth_name) != 0)
 
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       and (strcmp(cmdline_base, plymouth_alt_name) != 0)){
 
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      free(cmdline);
 
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      return 0;
 
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    }
 
174
    free(cmdline);
 
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    return 1;
 
176
  }
 
177
 
 
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  struct dirent **direntries;
 
179
  int ret;
 
180
  ret = scandir("/proc", &direntries, is_plymouth, alphasort);
 
181
  if (ret == -1){
 
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    error(1, errno, "scandir");
 
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  }
 
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  return ret > 0;
 
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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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270
  if (conflict_detection()){
 
271
    if(debug){
 
272
      fprintf(stderr, "Stopping %s because of conflict", argv[0]);
 
273
    }
 
274
    return EXIT_FAILURE;
 
275
  }
 
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  if(debug){
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    fprintf(stderr, "Storing current terminal attributes\n");
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  }