[openssh.git] / kex.h

/*	$OpenBSD: kex.h,v 1.35 2004/06/13 12:53:24 djm 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"

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_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;
	int	mac_len;
	u_char	*key;
	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];
	int	we_need;
	int	server;
	char	*name;
	int	hostkey_type;
	int	kex_type;
	Buffer	my;
	Buffer	peer;
	int	done;
	int	flags;
	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 *);

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
41e5bd9a	1	/* $OpenBSD: kex.h,v 1.35 2004/06/13 12:53:24 djm Exp $ */
23c2a7a5	2
7e7327a1	3	/*
a96070d4	4	* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
7e7327a1	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.
7e7327a1	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
b2552997	29	#include <openssl/evp.h>
b2552997	30	#include "buffer.h"
a5c9ffdb	31	#include "cipher.h"
a5c9ffdb	32	#include "key.h"
b2552997	33
94ec8c6b	34	#define KEX_DH1 "diffie-hellman-group1-sha1"
41e5bd9a	35	#define KEX_DH14 "diffie-hellman-group14-sha1"
94ec8c6b	36	#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
7e7327a1	37
	38	enum kex_init_proposals {
	39	PROPOSAL_KEX_ALGS,
	40	PROPOSAL_SERVER_HOST_KEY_ALGS,
	41	PROPOSAL_ENC_ALGS_CTOS,
	42	PROPOSAL_ENC_ALGS_STOC,
	43	PROPOSAL_MAC_ALGS_CTOS,
	44	PROPOSAL_MAC_ALGS_STOC,
	45	PROPOSAL_COMP_ALGS_CTOS,
	46	PROPOSAL_COMP_ALGS_STOC,
	47	PROPOSAL_LANG_CTOS,
	48	PROPOSAL_LANG_STOC,
	49	PROPOSAL_MAX
	50	};
	51
	52	enum kex_modes {
	53	MODE_IN,
	54	MODE_OUT,
	55	MODE_MAX
	56	};
	57
94ec8c6b	58	enum kex_exchange {
98a58eda	59	KEX_DH_GRP1_SHA1,
41e5bd9a	60	KEX_DH_GRP14_SHA1,
98a58eda	61	KEX_DH_GEX_SHA1,
98a58eda	62	KEX_MAX
94ec8c6b	63	};
2b87da3b	64
d1ac6175	65	#define KEX_INIT_SENT 0x0001
d1ac6175	66
7e7327a1	67	typedef struct Kex Kex;
	68	typedef struct Mac Mac;
	69	typedef struct Comp Comp;
	70	typedef struct Enc Enc;
d1ac6175	71	typedef struct Newkeys Newkeys;
7e7327a1	72
7e7327a1	73	struct Enc {
d1ac6175	74	char *name;
	75	Cipher *cipher;
	76	int enabled;
3ee832e5	77	u_int key_len;
3ee832e5	78	u_int block_size;
1e3b8b07	79	u_char *key;
1e3b8b07	80	u_char *iv;
7e7327a1	81	};
7e7327a1	82	struct Mac {
d1ac6175	83	char *name;
d1ac6175	84	int enabled;
7b5edc2b	85	const EVP_MD *md;
d1ac6175	86	int mac_len;
1e3b8b07	87	u_char *key;
d1ac6175	88	int key_len;
7e7327a1	89	};
7e7327a1	90	struct Comp {
d1ac6175	91	int type;
	92	int enabled;
	93	char *name;
	94	};
	95	struct Newkeys {
	96	Enc enc;
	97	Mac mac;
	98	Comp comp;
7e7327a1	99	};
7e7327a1	100	struct Kex {
d1ac6175	101	u_char *session_id;
661e45a0	102	u_int session_id_len;
c422989b	103	Newkeys *newkeys[MODE_MAX];
d1ac6175	104	int we_need;
	105	int server;
	106	char *name;
	107	int hostkey_type;
	108	int kex_type;
	109	Buffer my;
	110	Buffer peer;
c422989b	111	int done;
d1ac6175	112	int flags;
	113	char *client_version_string;
	114	char *server_version_string;
2a1e4639	115	int (verify_host_key)(Key );
2a1e4639	116	Key (load_host_key)(int);
1853d1ef	117	int (host_key_index)(Key );
98a58eda	118	void (kex[KEX_MAX])(Kex );
7e7327a1	119	};
7e7327a1	120
2a1e4639	121	Kex kex_setup(char [PROPOSAL_MAX]);
255cabd9	122	void kex_finish(Kex *);
d8ee838b	123
255cabd9	124	void kex_send_kexinit(Kex *);
7819b5c3	125	void kex_input_kexinit(int, u_int32_t, void *);
255cabd9	126	void kex_derive_keys(Kex , u_char , BIGNUM *);
7e7327a1	127
2a1e4639	128	Newkeys *kex_get_newkeys(int);
d1ac6175	129
98a58eda	130	void kexdh_client(Kex *);
	131	void kexdh_server(Kex *);
	132	void kexgex_client(Kex *);
	133	void kexgex_server(Kex *);
	134
	135	u_char *
	136	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	137	BIGNUM , BIGNUM , BIGNUM *);
	138	u_char *
	139	kexgex_hash(char , char , char , int, char , int, u_char *, int,
	140	int, int, int, BIGNUM , BIGNUM , BIGNUM , BIGNUM , BIGNUM *);
	141
7e9a0e92	142	void
	143	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	144
a5c9ffdb	145	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
2a1e4639	146	void dump_digest(char , u_char , int);
a5c9ffdb	147	#endif
7e7327a1	148
7e7327a1	149	#endif