| 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 | */ |
~mdw / disorder / blame