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41 lines
1011 B
C
41 lines
1011 B
C
/* vi: set sw=4 ts=4: */
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/*
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* Check user and group names for illegal characters
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*
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* Copyright (C) 2008 Tito Ragusa <farmatito@tiscali.it>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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/* To avoid problems, the username should consist only of
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* letters, digits, underscores, periods, at signs and dashes,
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* and not start with a dash (as defined by IEEE Std 1003.1-2001).
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* For compatibility with Samba machine accounts $ is also supported
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* at the end of the username.
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*/
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void FAST_FUNC die_if_bad_username(const char *name)
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{
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/* 1st char being dash or dot isn't valid: */
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goto skip;
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/* For example, name like ".." can make adduser
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* chown "/home/.." recursively - NOT GOOD
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*/
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do {
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if (*name == '-' || *name == '.')
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continue;
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skip:
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if (isalnum(*name)
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|| *name == '_'
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|| *name == '@'
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|| (*name == '$' && !name[1])
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) {
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continue;
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}
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bb_error_msg_and_die("illegal character '%c'", *name);
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} while (*++name);
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}
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