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Add new structure for signature options

This is populated during signature verification with additional fields
that are present in and covered by the signature. At the moment, it is
only used to record security key-specific options, especially the flags
field.

with and ok markus@

/* $OpenBSD: monitor_wrap.h,v 1.44 2019/11/25 00:51:37 djm Exp $ */

/*
 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
 * 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.
 */

#ifndef _MM_WRAP_H_
#define _MM_WRAP_H_

extern int use_privsep;
#define PRIVSEP(x)	(use_privsep ? mm_##x : x)

enum mm_keytype { MM_NOKEY, MM_HOSTKEY, MM_USERKEY };

struct ssh;
struct monitor;
struct Authctxt;
struct sshkey;
struct sshauthopt;
struct sshkey_sig_details;

void mm_log_handler(LogLevel, const char *, void *);
int mm_is_monitor(void);
#ifdef WITH_OPENSSL
DH *mm_choose_dh(int, int, int);
#endif
int mm_sshkey_sign(struct ssh *, struct sshkey *, u_char **, size_t *,
    const u_char *, size_t, const char *, const char *, u_int compat);
void mm_inform_authserv(char *, char *);
struct passwd *mm_getpwnamallow(struct ssh *, const char *);
char *mm_auth2_read_banner(void);
int mm_auth_password(struct ssh *, char *);
int mm_key_allowed(enum mm_keytype, const char *, const char *, struct sshkey *,
    int, struct sshauthopt **);
int mm_user_key_allowed(struct ssh *, struct passwd *, struct sshkey *, int,
    struct sshauthopt **);
int mm_hostbased_key_allowed(struct ssh *, struct passwd *, const char *,
    const char *, struct sshkey *);
int mm_sshkey_verify(const struct sshkey *, const u_char *, size_t,
    const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **);

#ifdef GSSAPI
OM_uint32 mm_ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
OM_uint32 mm_ssh_gssapi_accept_ctx(Gssctxt *,
   gss_buffer_desc *, gss_buffer_desc *, OM_uint32 *);
int mm_ssh_gssapi_userok(char *user);
OM_uint32 mm_ssh_gssapi_checkmic(Gssctxt *, gss_buffer_t, gss_buffer_t);
#endif

struct Session;
void mm_terminate(void);
int mm_pty_allocate(int *, int *, char *, size_t);
void mm_session_pty_cleanup2(struct Session *);

/* Key export functions */
struct newkeys *mm_newkeys_from_blob(u_char *, int);
int mm_newkeys_to_blob(int, u_char **, u_int *);

void mm_send_keystate(struct ssh *, struct monitor*);

/* bsdauth */
int mm_bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
int mm_bsdauth_respond(void *, u_int, char **);

#endif /* _MM_WRAP_H_ */