blob: 337ac6012b5250e876b0d434b355f28716914a37 [file] [log] [blame]
Denis Vlasenkodd5702d2008-03-19 23:15:55 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Ckeck user and group names for illegal characters
4 *
5 * Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include "libbb.h"
11
12/* To avoid problems, the username should consist only of
13 * letters, digits, underscores, periods, at signs and dashes,
14 * and not start with a dash (as defined by IEEE Std 1003.1-2001).
15 * For compatibility with Samba machine accounts $ is also supported
16 * at the end of the username.
17 */
18
19void die_if_bad_username(const char *name)
20{
Denis Vlasenko104d5442008-03-19 23:25:00 +000021 goto skip; /* 1st char being dash isn't valid */
Denis Vlasenkodd5702d2008-03-19 23:15:55 +000022 do {
Denis Vlasenko104d5442008-03-19 23:25:00 +000023 if (*name == '-')
24 continue;
25 skip:
26 if (isalnum(*name)
27 || *name == '_'
28 || *name == '.'
29 || *name == '@'
30 || (*name == '$' && !*(name + 1))
31 ) {
32 continue;
33 }
34 bb_error_msg_and_die("illegal character '%c'", *name);
Denis Vlasenkodd5702d2008-03-19 23:15:55 +000035 } while (*++name);
36}