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refactor channels.c

Move static state to a "struct ssh_channels" that is allocated at
runtime and tracked as a member of struct ssh.

Explicitly pass "struct ssh" to all channels functions.

Replace use of the legacy packet APIs in channels.c.

Rework sshd_config PermitOpen handling: previously the configuration
parser would call directly into the channels layer. After the refactor
this is not possible, as the channels structures are allocated at
connection time and aren't available when the configuration is parsed.
The server config parser now tracks PermitOpen itself and explicitly
configures the channels code later.

ok markus@

/* $OpenBSD: sshconnect.h,v 1.31 2017/09/12 06:32:07 djm Exp $ */

/*
 * Copyright (c) 2000 Markus Friedl.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

typedef struct Sensitive Sensitive;
struct Sensitive {
	struct sshkey	**keys;
	int		nkeys;
	int		external_keysign;
};

struct addrinfo;
struct ssh;

int	 ssh_connect(struct ssh *, const char *, struct addrinfo *,
	    struct sockaddr_storage *, u_short, int, int, int *, int, int);
void	 ssh_kill_proxy_command(void);

void	 ssh_login(Sensitive *, const char *, struct sockaddr *, u_short,
    struct passwd *, int);

void	 ssh_exchange_identification(int);

int	 verify_host_key(char *, struct sockaddr *, struct sshkey *);

void	 get_hostfile_hostname_ipaddr(char *, struct sockaddr *, u_short,
    char **, char **);

void	 ssh_kex(char *, struct sockaddr *);
void	 ssh_kex2(char *, struct sockaddr *, u_short);

void	 ssh_userauth1(const char *, const char *, char *, Sensitive *);
void	 ssh_userauth2(const char *, const char *, char *, Sensitive *);

void	 ssh_put_password(char *);
int	 ssh_local_cmd(const char *);

void	 maybe_add_key_to_agent(char *, struct sshkey *, char *, char *);

/*
 * Macros to raise/lower permissions.
 */
#define PRIV_START do {					\
	int save_errno = errno;				\
	if (seteuid(original_effective_uid) != 0)	\
		fatal("PRIV_START: seteuid: %s",	\
		    strerror(errno));			\
	errno = save_errno;				\
} while (0)

#define PRIV_END do {					\
	int save_errno = errno;				\
	if (seteuid(original_real_uid) != 0)		\
		fatal("PRIV_END: seteuid: %s",		\
		    strerror(errno));			\
	errno = save_errno;				\
} while (0)