busybox/libbb/die_if_bad_username.c

/* vi: set sw=4 ts=4: */
/*
 * Check 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	/* vi: set sw=4 ts=4: */
2	/*
3	* Check 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	}