busybox/libbb/die_if_bad_username.c

/* vi: set sw=4 ts=4: */
/*
 * Ckeck user and group names for illegal characters
 *
 * 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)
{
	goto skip; /* 1st char being dash isn't valid */
	do {
		if (*name == '-')
			continue;
 skip:
		if (isalnum(*name)
		 || *name == '_'
		 || *name == '.'
		 || *name == '@'
		 || (*name == '$' && !*(name + 1))
		) {
			continue;
		}
		bb_error_msg_and_die("illegal character '%c'", *name);
	} while (*++name);
}
1	niro	816	/* 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
19			void FAST_FUNC die_if_bad_username(const char *name)
20			{
21			goto skip; /* 1st char being dash isn't valid */
22			do {
23			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);
35			} while (*++name);
36			}