Steve,
Here is a copy of my wrapper.c file, can you take a look at it!
/*
* $Source: /sources/cvsrepos/majordomo/wrapper.c,v $
* $Revision: 1.8 $
* $Date: 1997/08/27 15:01:12 $
* $Author: cwilson $
* $State: Exp $
*
* $Locker: $
*
*/
#ifndef lint
static char rcs_header[] = "$Header: /sources/cvsrepos/majordomo/wrapper.c,v
1.8 1997/08/27 15:01:12 cwilson Exp $";
#endif
#include <stdio.h>
#include <sysexits.h>
#if defined(sun) && defined(sparc)
#include <stdlib.h>
#endif
#ifndef STRCHR
# include <string.h>
# define STRCHR(s,c) strchr(s,c)
#endif
#ifndef BIN
# define BIN "/usr/local/mail/majordomo"
#endif
#ifndef PATH
# define PATH "PATH=/bin:/usr/bin:/usr/ucb"
#endif
#ifndef HOME
# define HOME "HOME=/usr/local/mail/majordomo"
#endif
#ifndef SHELL
# define SHELL "SHELL=/bin/sh"
#endif
char * new_env[] = {
HOME, /* 0 */
PATH, /* 1 */
SHELL, /* 2 */
#ifdef MAJORDOMO_CF
MAJORDOMO_CF, /* 3 */
#endif
0, /* possibly for USER or LOGNAME */
0, /* possible for LOGNAME */
0, /* possibly for timezone */
0
};
int new_env_size = 7; /* to prevent overflow problems
*/
main(argc, argv, env)
int argc;
char * argv[];
char * env[];
{
char * prog;
int e, i;
if (argc < 2) {
fprintf(stderr, "USAGE: %s program [<arg> ...]\n", argv[0]);
exit(EX_USAGE);
}
/* if the command contains a /, then don't allow it */
if (STRCHR(argv[1], '/') != (char *) NULL) {
/* this error message is intentionally cryptic */
fprintf(stderr, "%s: error: insecure usage\n", argv[0]);
exit(EX_NOPERM);
}
if ((prog = (char *) malloc(strlen(BIN) + strlen(argv[1]) + 2)) == NULL) {
fprintf(stderr, "%s: error: malloc failed\n", argv[0]);
exit(EX_OSERR);
}
sprintf(prog, "%s/%s", BIN, argv[1]);
/* copy the "USER=" and "LOGNAME=" envariables into the new environment,
* if they exist.
*/
#ifdef MAJORDOMO_CF
e = 4; /* the first unused slot in new_env[] */
#else
e = 3; /* the first unused slot in new_env[] */
#endif
for (i = 0 ; env[i] != NULL && e <= new_env_size; i++) {
if ((strncmp(env[i], "USER=", 5) == 0) ||
(strncmp(env[i], "TZ=", 3) == 0) ||
(strncmp(env[i], "LOGNAME=", 8) == 0)) {
new_env[e++] = env[i];
}
}
#if defined(SETGROUP)
/* renounce any previous group memberships if we are running as root */
if (geteuid() == 0) { /* Should I exit if this test fails? */
char *setgroups_used = "setgroups_was_included"; /* give strings a hint */
#if defined(MAIL_GID)
int groups[] = { POSIX_GID, MAIL_GID, 0 };
if (setgroups(2, groups) == -1) {
#else
int groups[] = { POSIX_GID, 0 };
if (setgroups(1, groups) == -1) {
#endif
extern int errno;
fprintf(stderr, "%s: error setgroups failed errno %d", argv[0],
errno);
}
}
#endif
#ifdef POSIX_GID
setgid(POSIX_GID);
#else
setgid(getegid());
#endif
#ifdef POSIX_UID
setuid(POSIX_UID);
#else
setuid(geteuid());
#endif
if ((getuid() != geteuid()) || (getgid() != getegid())) {
fprintf(stderr, "%s: error: Not running with proper UID and GID.\n",
argv[0]);
fprintf(stderr, " Make certain that wrapper is installed setuid, and
if so,\n");
fprintf(stderr, " recompile with POSIX flags.\n");
exit(EX_SOFTWARE);
}
execve(prog, argv+1, new_env);
/* the exec should never return */
fprintf(stderr, "wrapper: Trying to exec %s failed: ", prog);
perror(NULL);
fprintf(stderr, " Did you define PERL correctly in the Makefile?\n");
fprintf(stderr, " HOME is %s,\n", HOME);
fprintf(stderr, " PATH is %s,\n", PATH);
fprintf(stderr, " SHELL is %s,\n", SHELL);
fprintf(stderr, " MAJORDOMO_CF is %s\n", MAJORDOMO_CF);
exit(EX_OSERR);
}
