shadow/libmisc/chkname.c
nekral-guest c28c443d8f * NEWS, configure.in, libmisc/chkname.c: make group max length a
configure option.  The configure behavior encoded is:
	<no option> -> default of 16 (like today);
	--with-group-name-max-length -> default of 16;
	--without-group-name-max-length -> no max length;
	--with-group-name-max-length=n > max is set to n.
2008-11-30 01:29:40 +00:00

109 lines
3.0 KiB
C

/*
* Copyright (c) 1990 - 1994, Julianne Frances Haugh
* Copyright (c) 1996 - 2000, Marek Michałkiewicz
* Copyright (c) 2001 - 2005, Tomasz Kłoczko
* Copyright (c) 2005 - 2008, Nicolas François
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the copyright holders or contributors may not be used to
* endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* is_valid_user_name(), is_valid_group_name() - check the new user/group
* name for validity;
* return values:
* true - OK
* false - bad name
*/
#include <config.h>
#ident "$Id$"
#include <ctype.h>
#include "defines.h"
#include "chkname.h"
#if HAVE_UTMPX_H
#include <utmpx.h>
#else
#include <utmp.h>
#endif
static bool is_valid_name (const char *name)
{
/*
* User/group names must match [a-z_][a-z0-9_-]*[$]
*/
if (('\0' == *name) ||
!((('a' <= *name) && ('z' >= *name)) || ('_' == *name))) {
return false;
}
while ('\0' != *++name) {
if (!(( ('a' <= *name) && ('z' >= *name) ) ||
( ('0' <= *name) && ('9' >= *name) ) ||
('_' == *name) ||
('-' == *name) ||
( ('$' == *name) && ('\0' == *(name + 1)) )
)) {
return false;
}
}
return true;
}
bool is_valid_user_name (const char *name)
{
#if HAVE_UTMPX_H
struct utmpx ut;
#else
struct utmp ut;
#endif
/*
* User names are limited by whatever utmp can
* handle (usually max 8 characters).
*/
if (strlen (name) > sizeof (ut.ut_user)) {
return false;
}
return is_valid_name (name);
}
bool is_valid_group_name (const char *name)
{
/*
* Arbitrary limit for group names - max 16
* characters (same as on HP-UX 10).
*/
if (GROUP_NAME_MAX_LENGTH && strlen (name) > GROUP_NAME_MAX_LENGTH)
return false;
return is_valid_name (name);
}