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 | |
34 | void 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 | /* |
58 | Local Variables: |
59 | c-basic-offset:2 |
60 | comment-column:40 |
61 | fill-column:79 |
62 | indent-tabs-mode:nil |
63 | End: |
64 | */ |