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Commit	Line	Data
	1	/* $OpenBSD: kex.h,v 1.39 2006/03/07 09:07:40 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_SHA1 "diffie-hellman-group-exchange-sha1"
	37	#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
	38
	39	#define COMP_NONE 0
	40	#define COMP_ZLIB 1
	41	#define COMP_DELAYED 2
	42
	43	enum kex_init_proposals {
	44	PROPOSAL_KEX_ALGS,
	45	PROPOSAL_SERVER_HOST_KEY_ALGS,
	46	PROPOSAL_ENC_ALGS_CTOS,
	47	PROPOSAL_ENC_ALGS_STOC,
	48	PROPOSAL_MAC_ALGS_CTOS,
	49	PROPOSAL_MAC_ALGS_STOC,
	50	PROPOSAL_COMP_ALGS_CTOS,
	51	PROPOSAL_COMP_ALGS_STOC,
	52	PROPOSAL_LANG_CTOS,
	53	PROPOSAL_LANG_STOC,
	54	PROPOSAL_MAX
	55	};
	56
	57	enum kex_modes {
	58	MODE_IN,
	59	MODE_OUT,
	60	MODE_MAX
	61	};
	62
	63	enum kex_exchange {
	64	KEX_DH_GRP1_SHA1,
	65	KEX_DH_GRP14_SHA1,
	66	KEX_DH_GEX_SHA1,
	67	KEX_DH_GEX_SHA256,
	68	KEX_MAX
	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;
	83	u_int key_len;
	84	u_int block_size;
	85	u_char *key;
	86	u_char *iv;
	87	};
	88	struct Mac {
	89	char *name;
	90	int enabled;
	91	const EVP_MD *md;
	92	u_int mac_len;
	93	u_char *key;
	94	u_int key_len;
	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	};
	106	struct Kex {
	107	u_char *session_id;
	108	u_int session_id_len;
	109	Newkeys *newkeys[MODE_MAX];
	110	u_int we_need;
	111	int server;
	112	char *name;
	113	int hostkey_type;
	114	int kex_type;
	115	Buffer my;
	116	Buffer peer;
	117	int done;
	118	int flags;
	119	const EVP_MD *evp_md;
	120	char *client_version_string;
	121	char *server_version_string;
	122	int (verify_host_key)(Key );
	123	Key (load_host_key)(int);
	124	int (host_key_index)(Key );
	125	void (kex[KEX_MAX])(Kex );
	126	};
	127
	128	Kex kex_setup(char [PROPOSAL_MAX]);
	129	void kex_finish(Kex *);
	130
	131	void kex_send_kexinit(Kex *);
	132	void kex_input_kexinit(int, u_int32_t, void *);
	133	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
	134
	135	Newkeys *kex_get_newkeys(int);
	136
	137	void kexdh_client(Kex *);
	138	void kexdh_server(Kex *);
	139	void kexgex_client(Kex *);
	140	void kexgex_server(Kex *);
	141
	142	void
	143	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	144	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	145	void
	146	kexgex_hash(const EVP_MD , char , char , char , int, char *,
	147	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
	148	BIGNUM , BIGNUM , u_char *, u_int );
	149
	150	void
	151	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	152
	153	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	154	void dump_digest(char , u_char , int);
	155	#endif
	156
	157	#endif