81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
/*
|
|
* Copyright Red Hat Inc. 2008
|
|
*
|
|
* Author: Steve Olivieri <sjo@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of version 2.1 of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it would be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
/*
|
|
* This is just a simple program for changing a UID or a GID. Comment out
|
|
* whichever block you don't want to use.
|
|
*/
|
|
int main(int argc, char *argv[])
|
|
{
|
|
/* User data */
|
|
struct passwd *pwd;
|
|
|
|
/* UID of user */
|
|
uid_t uid;
|
|
|
|
/* Return codes */
|
|
int ret = 0;
|
|
|
|
if (argc < 2) {
|
|
printf("Usage: %s <uid_value> \n", argv[0]);
|
|
goto finished;
|
|
}
|
|
|
|
pwd = getpwnam(argv[1]);
|
|
if (!pwd) {
|
|
fprintf(stderr, "getpwnam() failed: %s\n",
|
|
strerror(errno));
|
|
ret = -errno;
|
|
goto finished;
|
|
}
|
|
uid = pwd->pw_uid;
|
|
fprintf(stdout, "Setting UID to %s (%d).\n", pwd->pw_name, uid);
|
|
if ((ret = setuid(uid))) {
|
|
fprintf(stderr, "Call to setuid() failed with error: %s\n",
|
|
strerror(errno));
|
|
ret = -errno;
|
|
goto finished;
|
|
}
|
|
|
|
// while(1) {
|
|
// grp = getgrnam("root");
|
|
// gid = grp->gr_gid;
|
|
// fprintf(stdout, "Setting GID to %s (%d).\n",
|
|
// grp->gr_name, gid);
|
|
// if ((ret = setgid(gid))) {
|
|
// fprintf(stderr, "Call to setgid() failed with error:"
|
|
// " %s\n", strerror(errno));
|
|
// ret = -errno;
|
|
// goto finished;
|
|
// }
|
|
// }
|
|
|
|
while (1) {
|
|
usleep(3000000);
|
|
}
|
|
|
|
finished:
|
|
return ret;
|
|
}
|