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redo the environment inheritance to not inherit. it was intended to make
life easier, but it can be surprising or even unsafe. instead, reset just
about everything to the target user's values.
ok deraadt martijn
Thanks to Sander Bos in particular for pointing out some nasty edge cases.

/* $OpenBSD: doas.h,v 1.14 2019/06/16 18:16:34 tedu Exp $ */
/*
 * Copyright (c) 2015 Ted Unangst <tedu@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

struct rule {
	int action;
	int options;
	const char *ident;
	const char *target;
	const char *cmd;
	const char **cmdargs;
	const char **envlist;
};

extern struct rule **rules;
extern int nrules;
extern int parse_errors;

struct passwd;

char **prepenv(const struct rule *, const struct passwd *,
    const struct passwd *);

#define PERMIT	1
#define DENY	2

#define NOPASS		0x1
#define KEEPENV		0x2
#define PERSIST		0x4