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Commit	Line	Data
	1	/* $OpenBSD: kex.h,v 1.35 2004/06/13 12:53:24 djm Exp $ */
	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"
	35	#define KEX_DH14 "diffie-hellman-group14-sha1"
	36	#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
	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
	58	enum kex_exchange {
	59	KEX_DH_GRP1_SHA1,
	60	KEX_DH_GRP14_SHA1,
	61	KEX_DH_GEX_SHA1,
	62	KEX_MAX
	63	};
	64
	65	#define KEX_INIT_SENT 0x0001
	66
	67	typedef struct Kex Kex;
	68	typedef struct Mac Mac;
	69	typedef struct Comp Comp;
	70	typedef struct Enc Enc;
	71	typedef struct Newkeys Newkeys;
	72
	73	struct Enc {
	74	char *name;
	75	Cipher *cipher;
	76	int enabled;
	77	u_int key_len;
	78	u_int block_size;
	79	u_char *key;
	80	u_char *iv;
	81	};
	82	struct Mac {
	83	char *name;
	84	int enabled;
	85	const EVP_MD *md;
	86	int mac_len;
	87	u_char *key;
	88	int key_len;
	89	};
	90	struct Comp {
	91	int type;
	92	int enabled;
	93	char *name;
	94	};
	95	struct Newkeys {
	96	Enc enc;
	97	Mac mac;
	98	Comp comp;
	99	};
	100	struct Kex {
	101	u_char *session_id;
	102	u_int session_id_len;
	103	Newkeys *newkeys[MODE_MAX];
	104	int we_need;
	105	int server;
	106	char *name;
	107	int hostkey_type;
	108	int kex_type;
	109	Buffer my;
	110	Buffer peer;
	111	int done;
	112	int flags;
	113	char *client_version_string;
	114	char *server_version_string;
	115	int (verify_host_key)(Key );
	116	Key (load_host_key)(int);
	117	int (host_key_index)(Key );
	118	void (kex[KEX_MAX])(Kex );
	119	};
	120
	121	Kex kex_setup(char [PROPOSAL_MAX]);
	122	void kex_finish(Kex *);
	123
	124	void kex_send_kexinit(Kex *);
	125	void kex_input_kexinit(int, u_int32_t, void *);
	126	void kex_derive_keys(Kex , u_char , BIGNUM *);
	127
	128	Newkeys *kex_get_newkeys(int);
	129
	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
	142	void
	143	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	144
	145	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	146	void dump_digest(char , u_char , int);
	147	#endif
	148
	149	#endif