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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: ssherr.h,v 1.5 2017/09/12 06:32:08 djm Exp $	*/
/*
 * Copyright (c) 2011 Damien Miller
 *
 * 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.
 */

#ifndef _SSHERR_H
#define _SSHERR_H

/* XXX are these too granular? not granular enough? I can't decide - djm */

/* Error codes */
#define SSH_ERR_SUCCESS				0
#define SSH_ERR_INTERNAL_ERROR			-1
#define SSH_ERR_ALLOC_FAIL			-2
#define SSH_ERR_MESSAGE_INCOMPLETE		-3
#define SSH_ERR_INVALID_FORMAT			-4
#define SSH_ERR_BIGNUM_IS_NEGATIVE		-5
#define SSH_ERR_STRING_TOO_LARGE		-6
#define SSH_ERR_BIGNUM_TOO_LARGE		-7
#define SSH_ERR_ECPOINT_TOO_LARGE		-8
#define SSH_ERR_NO_BUFFER_SPACE			-9
#define SSH_ERR_INVALID_ARGUMENT		-10
#define SSH_ERR_KEY_BITS_MISMATCH		-11
#define SSH_ERR_EC_CURVE_INVALID		-12
#define SSH_ERR_KEY_TYPE_MISMATCH		-13
#define SSH_ERR_KEY_TYPE_UNKNOWN		-14 /* XXX UNSUPPORTED? */
#define SSH_ERR_EC_CURVE_MISMATCH		-15
#define SSH_ERR_EXPECTED_CERT			-16
#define SSH_ERR_KEY_LACKS_CERTBLOB		-17
#define SSH_ERR_KEY_CERT_UNKNOWN_TYPE		-18
#define SSH_ERR_KEY_CERT_INVALID_SIGN_KEY	-19
#define SSH_ERR_KEY_INVALID_EC_VALUE		-20
#define SSH_ERR_SIGNATURE_INVALID		-21
#define SSH_ERR_LIBCRYPTO_ERROR			-22
#define SSH_ERR_UNEXPECTED_TRAILING_DATA	-23
#define SSH_ERR_SYSTEM_ERROR			-24
#define SSH_ERR_KEY_CERT_INVALID		-25
#define SSH_ERR_AGENT_COMMUNICATION		-26
#define SSH_ERR_AGENT_FAILURE			-27
#define SSH_ERR_DH_GEX_OUT_OF_RANGE		-28
#define SSH_ERR_DISCONNECTED			-29
#define SSH_ERR_MAC_INVALID			-30
#define SSH_ERR_NO_CIPHER_ALG_MATCH		-31
#define SSH_ERR_NO_MAC_ALG_MATCH		-32
#define SSH_ERR_NO_COMPRESS_ALG_MATCH		-33
#define SSH_ERR_NO_KEX_ALG_MATCH		-34
#define SSH_ERR_NO_HOSTKEY_ALG_MATCH		-35
#define SSH_ERR_NO_HOSTKEY_LOADED		-36
#define SSH_ERR_PROTOCOL_MISMATCH		-37
#define SSH_ERR_NO_PROTOCOL_VERSION		-38
#define SSH_ERR_NEED_REKEY			-39
#define SSH_ERR_PASSPHRASE_TOO_SHORT		-40
#define SSH_ERR_FILE_CHANGED			-41
#define SSH_ERR_KEY_UNKNOWN_CIPHER		-42
#define SSH_ERR_KEY_WRONG_PASSPHRASE		-43
#define SSH_ERR_KEY_BAD_PERMISSIONS		-44
#define SSH_ERR_KEY_CERT_MISMATCH		-45
#define SSH_ERR_KEY_NOT_FOUND			-46
#define SSH_ERR_AGENT_NOT_PRESENT		-47
#define SSH_ERR_AGENT_NO_IDENTITIES		-48
#define SSH_ERR_BUFFER_READ_ONLY		-49
#define SSH_ERR_KRL_BAD_MAGIC			-50
#define SSH_ERR_KEY_REVOKED			-51
#define SSH_ERR_CONN_CLOSED			-52
#define SSH_ERR_CONN_TIMEOUT			-53
#define SSH_ERR_CONN_CORRUPT			-54
#define SSH_ERR_PROTOCOL_ERROR			-55
#define SSH_ERR_KEY_LENGTH			-56
#define SSH_ERR_NUMBER_TOO_LARGE		-57

/* Translate a numeric error code to a human-readable error string */
const char *ssh_err(int n);

#endif /* _SSHERR_H */