[gssapi-openssh.git] / openssh / kex.h

/*	$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_GSS_GEX_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 KexOptions {
	int	gss_deleg_creds;
};

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;
	int	gss_trust_dns;
	char    *gss_host;
#endif
	char	*client_version_string;
	char	*server_version_string;
	struct  KexOptions options;
	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
Commit	Line	Data
2ce0bfe4	1	/* $OpenBSD: kex.h,v 1.37 2005/07/25 11:59:39 markus Exp $ */
3c0ef626	2
	3	/*
	4	* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26	#ifndef KEX_H
	27	#define KEX_H
	28
	29	#include <openssl/evp.h>
	30	#include "buffer.h"
	31	#include "cipher.h"
	32	#include "key.h"
	33
	34	#define KEX_DH1 "diffie-hellman-group1-sha1"
7e82606e	35	#define KEX_DH14 "diffie-hellman-group14-sha1"
3c0ef626	36	#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
3c0ef626	37
2ce0bfe4	38	#define COMP_NONE 0
	39	#define COMP_ZLIB 1
	40	#define COMP_DELAYED 2
	41
3c0ef626	42	enum kex_init_proposals {
	43	PROPOSAL_KEX_ALGS,
	44	PROPOSAL_SERVER_HOST_KEY_ALGS,
	45	PROPOSAL_ENC_ALGS_CTOS,
	46	PROPOSAL_ENC_ALGS_STOC,
	47	PROPOSAL_MAC_ALGS_CTOS,
	48	PROPOSAL_MAC_ALGS_STOC,
	49	PROPOSAL_COMP_ALGS_CTOS,
	50	PROPOSAL_COMP_ALGS_STOC,
	51	PROPOSAL_LANG_CTOS,
	52	PROPOSAL_LANG_STOC,
	53	PROPOSAL_MAX
	54	};
	55
	56	enum kex_modes {
	57	MODE_IN,
	58	MODE_OUT,
	59	MODE_MAX
	60	};
	61
	62	enum kex_exchange {
8afc6a66	63	KEX_DH_GRP1_SHA1,
7e82606e	64	KEX_DH_GRP14_SHA1,
8afc6a66	65	KEX_DH_GEX_SHA1,
8afc6a66	66	KEX_GSS_GRP1_SHA1,
fe4ad273	67	KEX_GSS_GEX_SHA1,
8afc6a66	68	KEX_MAX
3c0ef626	69	};
	70
	71	#define KEX_INIT_SENT 0x0001
	72
	73	typedef struct Kex Kex;
	74	typedef struct Mac Mac;
	75	typedef struct Comp Comp;
	76	typedef struct Enc Enc;
	77	typedef struct Newkeys Newkeys;
	78
	79	struct Enc {
	80	char *name;
	81	Cipher *cipher;
	82	int enabled;
e9702f7d	83	u_int key_len;
e9702f7d	84	u_int block_size;
3c0ef626	85	u_char *key;
	86	u_char *iv;
	87	};
	88	struct Mac {
	89	char *name;
	90	int enabled;
44a053a3	91	const EVP_MD *md;
2ce0bfe4	92	u_int mac_len;
3c0ef626	93	u_char *key;
2ce0bfe4	94	u_int key_len;
3c0ef626	95	};
	96	struct Comp {
	97	int type;
	98	int enabled;
	99	char *name;
	100	};
	101	struct Newkeys {
	102	Enc enc;
	103	Mac mac;
	104	Comp comp;
	105	};
5598e598	106
	107	struct KexOptions {
	108	int gss_deleg_creds;
	109	};
	110
3c0ef626	111	struct Kex {
3c0ef626	112	u_char *session_id;
d03f4262	113	u_int session_id_len;
3c0ef626	114	Newkeys *newkeys[MODE_MAX];
2ce0bfe4	115	u_int we_need;
3c0ef626	116	int server;
	117	char *name;
	118	int hostkey_type;
	119	int kex_type;
	120	Buffer my;
	121	Buffer peer;
	122	int done;
	123	int flags;
fe4ad273	124	#ifdef GSSAPI
	125	int gss_deleg_creds;
	126	int gss_trust_dns;
	127	char *gss_host;
	128	#endif
3c0ef626	129	char *client_version_string;
3c0ef626	130	char *server_version_string;
23987cb8	131	struct KexOptions options;
3c0ef626	132	int (verify_host_key)(Key );
3c0ef626	133	Key (load_host_key)(int);
350391c5	134	int (host_key_index)(Key );
8afc6a66	135	void (kex[KEX_MAX])(Kex );
3c0ef626	136	};
	137
	138	Kex kex_setup(char [PROPOSAL_MAX]);
	139	void kex_finish(Kex *);
	140
	141	void kex_send_kexinit(Kex *);
e9702f7d	142	void kex_input_kexinit(int, u_int32_t, void *);
3c0ef626	143	void kex_derive_keys(Kex , u_char , BIGNUM *);
3c0ef626	144
8afc6a66	145	Newkeys *kex_get_newkeys(int);
	146
	147	void kexdh_client(Kex *);
	148	void kexdh_server(Kex *);
	149	void kexgex_client(Kex *);
	150	void kexgex_server(Kex *);
fe4ad273	151
b2b34e95	152	#ifdef GSSAPI
fe4ad273	153	void kexgss_client(Kex *);
fe4ad273	154	void kexgss_server(Kex *);
b2b34e95	155	#endif
905081a4	156
8afc6a66	157	u_char *
	158	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	159	BIGNUM , BIGNUM , BIGNUM *);
	160	u_char *
	161	kexgex_hash(char , char , char , int, char , int, u_char *, int,
	162	int, int, int, BIGNUM , BIGNUM , BIGNUM , BIGNUM , BIGNUM *);
3c0ef626	163
7e82606e	164	void
	165	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	166
3c0ef626	167	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	168	void dump_digest(char , u_char , int);
	169	#endif
	170
	171	#endif