Hrm, it stripped my attachment. Here it is inline.

/* This quick C program wraps around any program or daemon and allows it
  to run in a chroot'ed enviornment with reduced priveledges of any gid
  uid of choice from the command line.
  The excel() function call could use some work for more flexibility.
  This code was based on a howto at
  http://www.sans.org/rr/linux/daemons.php
  The syntax for this command is:
  "chrootwrap <chroot dir> <gid> <uid> <command> <single argument -
optional>'

   This program must be executed as root.

Ted Goodridge
tedgoodridgejracm.org

*/

#include <unistd.h>
#include <sys/types.h>
#include <errno.h>

/* function prototypes */
int main (int argc, char *argv[]);
int printError(int error);
/* ------------------------------- */

int printError(int error) {
/* This function produces the error output based on error. */
switch (error) {
        case EPERM : printf ("Operation not permitted\n");
                        break;
        case EACCES: printf("You do not have permission to that path\n");
                        break;
        case ENOTDIR: printf("That is not a directory\n");
                        break;
        case ENOENT: printf("That directory does not exist\n");
                        break;
        case EIO: printf("I/O error!\n");
                        break;
        default:
                 printf("Unknown error!\n");
        } //switch (error)
return 0;
} //printErroR

int main (int argc, char *argv[]) {
  int gidlist[] = {atoi(argv[2])};
  if(chroot(argv[1])){
 printError(errno);
 printf("Unable to change the root, exiting.\n");
   exit(1);
  }//end if
  chdir("/");

  if(setgid(atoi(argv[2]))) {
 printf("unable to setgid!\n");
  exit(1);
  }

  if(setgroups(1,gidlist)) { // also, could use initgroups
 printf("unable to set groups!\n");
 exit(1);
  }
  if(setuid(atoi(argv[3]))) {
 printf("unable to setuid!\n");
 exit(1);
  }
  if(execl(argv[4],argv[4],argv[5],NULL)){

  printError(errno);
 exit(1);
  } //if execl
return 0;
}

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