restrict_process_pledge.c

/* Copyright (c) 2019-2023, Michael Santos <michael.santos@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "restrict_process.h"
#ifdef RESTRICT_PROCESS_pledge
#include <string.h>
#include <unistd.h>

#define PLEDGENAMES
#include <sys/pledge.h>

int disable_setuid_subprocess(void) {
  char execpromises[1024] = {0};
  int i;

  for (i = 0; pledgenames[i].name != NULL; i++) {
    if ((strlcat(execpromises, pledgenames[i].name, sizeof(execpromises)) >=
         sizeof(execpromises)) ||
        (strlcat(execpromises, " ", sizeof(execpromises)) >=
         sizeof(execpromises)))
      return -1;
  }
  return pledge(NULL, execpromises);
}

int restrict_process_signal_on_supervisor_exit(void) { return 0; }

int restrict_process_init(void) {
  return pledge("stdio exec proc rpath wpath cpath flock", NULL);
}

int restrict_process(void) { return pledge("stdio", NULL); }

int restrict_process_wait(int fdp) {
  (void)fdp;
  return pledge("stdio proc", NULL);
}
#endif