source: trunk/third/openssh/kex.h @ 22574

/*      $OpenBSD: kex.h,v 1.37 2005/07/25 11:59:39 markus Exp $ */

/*
 * Copyright (c) 2000, 2001 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.
 */
#ifndef KEX_H
#define KEX_H

#include <openssl/evp.h>
#include "buffer.h"
#include "cipher.h"
#include "key.h"

#define KEX_DH1         "diffie-hellman-group1-sha1"
#define KEX_DH14        "diffie-hellman-group14-sha1"
#define KEX_DHGEX       "diffie-hellman-group-exchange-sha1"

#define COMP_NONE       0
#define COMP_ZLIB       1
#define COMP_DELAYED    2

enum kex_init_proposals {
        PROPOSAL_KEX_ALGS,
        PROPOSAL_SERVER_HOST_KEY_ALGS,
        PROPOSAL_ENC_ALGS_CTOS,
        PROPOSAL_ENC_ALGS_STOC,
        PROPOSAL_MAC_ALGS_CTOS,
        PROPOSAL_MAC_ALGS_STOC,
        PROPOSAL_COMP_ALGS_CTOS,
        PROPOSAL_COMP_ALGS_STOC,
        PROPOSAL_LANG_CTOS,
        PROPOSAL_LANG_STOC,
        PROPOSAL_MAX
};

enum kex_modes {
        MODE_IN,
        MODE_OUT,
        MODE_MAX
};

enum kex_exchange {
        KEX_DH_GRP1_SHA1,
        KEX_DH_GRP14_SHA1,
        KEX_DH_GEX_SHA1,
        KEX_GSS_GRP1_SHA1,
        KEX_MAX
};

#define KEX_INIT_SENT   0x0001

typedef struct Kex Kex;
typedef struct Mac Mac;
typedef struct Comp Comp;
typedef struct Enc Enc;
typedef struct Newkeys Newkeys;

struct Enc {
        char    *name;
        Cipher  *cipher;
        int     enabled;
        u_int   key_len;
        u_int   block_size;
        u_char  *key;
        u_char  *iv;
};
struct Mac {
        char    *name;
        int     enabled;
        const EVP_MD    *md;
        u_int   mac_len;
        u_char  *key;
        u_int   key_len;
};
struct Comp {
        int     type;
        int     enabled;
        char    *name;
};
struct Newkeys {
        Enc     enc;
        Mac     mac;
        Comp    comp;
};
struct Kex {
        u_char  *session_id;
        u_int   session_id_len;
        Newkeys *newkeys[MODE_MAX];
        u_int   we_need;
        int     server;
        char    *name;
        int     hostkey_type;
        int     kex_type;
        Buffer  my;
        Buffer  peer;
        int     done;
        int     flags;
#ifdef GSSAPI
        int gss_deleg_creds;
#endif
        char    *client_version_string;
        char    *server_version_string;
        int     (*verify_host_key)(Key *);
        Key     *(*load_host_key)(int);
        int     (*host_key_index)(Key *);
        void    (*kex[KEX_MAX])(Kex *);
};

Kex     *kex_setup(char *[PROPOSAL_MAX]);
void     kex_finish(Kex *);

void     kex_send_kexinit(Kex *);
void     kex_input_kexinit(int, u_int32_t, void *);
void     kex_derive_keys(Kex *, u_char *, BIGNUM *);

Newkeys *kex_get_newkeys(int);

void     kexdh_client(Kex *);
void     kexdh_server(Kex *);
void     kexgex_client(Kex *);
void     kexgex_server(Kex *);
#ifdef GSSAPI
void     kexgss_client(Kex *);
void     kexgss_server(Kex *);
#endif

u_char *
kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
    BIGNUM *, BIGNUM *, BIGNUM *);
u_char *
kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int,
    int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *);

void
derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);

#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
void    dump_digest(char *, u_char *, int);
#endif

#endif