chiark / gitweb /
further empeg support
[disorder] / lib / user.c
CommitLineData
460b9539 1/*
2 * This file is part of DisOrder
3 * Copyright (C) 2005 Richard Kettlewell
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include <config.h>
22#include "types.h"
23
24#include <sys/types.h>
25#include <errno.h>
26#include <pwd.h>
27#include <grp.h>
28#include <unistd.h>
29
30#include "user.h"
31#include "log.h"
32#include "configuration.h"
33
34void become_mortal(void) {
35 struct passwd *pw;
36
37 if(config->user) {
38 if(!(pw = getpwnam(config->user)))
39 fatal(0, "cannot find user %s", config->user);
40 if(pw->pw_uid != getuid()) {
41 if(initgroups(config->user, pw->pw_gid))
42 fatal(errno, "error calling initgroups");
43 if(setgid(pw->pw_gid) < 0) fatal(errno, "error calling setgid");
44 if(setuid(pw->pw_uid) < 0) fatal(errno, "error calling setgid");
45 info("changed to user %s (uid %lu)", config->user, (unsigned long)getuid());
46 }
47 /* sanity checks */
48 if(getuid() != pw->pw_uid) fatal(0, "wrong real uid");
49 if(geteuid() != pw->pw_uid) fatal(0, "wrong effective uid");
50 if(getgid() != pw->pw_gid) fatal(0, "wrong real gid");
51 if(getegid() != pw->pw_gid) fatal(0, "wrong effective gid");
52 if(setuid(0) != -1) fatal(0, "setuid(0) unexpectedly succeeded");
53 if(seteuid(0) != -1) fatal(0, "seteuid(0) unexpectedly succeeded");
54 }
55}
56
57/*
58Local Variables:
59c-basic-offset:2
60comment-column:40
61fill-column:79
62indent-tabs-mode:nil
63End:
64*/