busybox/libbb/die_if_bad_username.c

37 lines
910 B
C
Raw Normal View History

2008-03-20 04:45:55 +05:30
/* vi: set sw=4 ts=4: */
/*
2009-03-31 18:44:18 +05:30
* Check user and group names for illegal characters
2008-03-20 04:45:55 +05:30
*
* Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
/* To avoid problems, the username should consist only of
* letters, digits, underscores, periods, at signs and dashes,
* and not start with a dash (as defined by IEEE Std 1003.1-2001).
* For compatibility with Samba machine accounts $ is also supported
* at the end of the username.
*/
void FAST_FUNC die_if_bad_username(const char *name)
2008-03-20 04:45:55 +05:30
{
goto skip; /* 1st char being dash isn't valid */
2008-03-20 04:45:55 +05:30
do {
if (*name == '-')
continue;
skip:
if (isalnum(*name)
|| *name == '_'
|| *name == '.'
|| *name == '@'
|| (*name == '$' && !*(name + 1))
) {
continue;
}
bb_error_msg_and_die("illegal character '%c'", *name);
2008-03-20 04:45:55 +05:30
} while (*++name);
}