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Commit	Line	Data
	1	/* $OpenBSD: kex.h,v 1.44 2006/08/03 03:34:42 deraadt 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 <signal.h>
	30	#include <openssl/evp.h>
	31
	32	#define KEX_DH1 "diffie-hellman-group1-sha1"
	33	#define KEX_DH14 "diffie-hellman-group14-sha1"
	34	#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
	35	#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
	36
	37	#define COMP_NONE 0
	38	#define COMP_ZLIB 1
	39	#define COMP_DELAYED 2
	40
	41	enum kex_init_proposals {
	42	PROPOSAL_KEX_ALGS,
	43	PROPOSAL_SERVER_HOST_KEY_ALGS,
	44	PROPOSAL_ENC_ALGS_CTOS,
	45	PROPOSAL_ENC_ALGS_STOC,
	46	PROPOSAL_MAC_ALGS_CTOS,
	47	PROPOSAL_MAC_ALGS_STOC,
	48	PROPOSAL_COMP_ALGS_CTOS,
	49	PROPOSAL_COMP_ALGS_STOC,
	50	PROPOSAL_LANG_CTOS,
	51	PROPOSAL_LANG_STOC,
	52	PROPOSAL_MAX
	53	};
	54
	55	enum kex_modes {
	56	MODE_IN,
	57	MODE_OUT,
	58	MODE_MAX
	59	};
	60
	61	enum kex_exchange {
	62	KEX_DH_GRP1_SHA1,
	63	KEX_DH_GRP14_SHA1,
	64	KEX_DH_GEX_SHA1,
	65	KEX_DH_GEX_SHA256,
	66	KEX_MAX
	67	};
	68
	69	#define KEX_INIT_SENT 0x0001
	70
	71	typedef struct Kex Kex;
	72	typedef struct Mac Mac;
	73	typedef struct Comp Comp;
	74	typedef struct Enc Enc;
	75	typedef struct Newkeys Newkeys;
	76
	77	struct Enc {
	78	char *name;
	79	Cipher *cipher;
	80	int enabled;
	81	u_int key_len;
	82	u_int block_size;
	83	u_char *key;
	84	u_char *iv;
	85	};
	86	struct Mac {
	87	char *name;
	88	int enabled;
	89	const EVP_MD *md;
	90	u_int mac_len;
	91	u_char *key;
	92	u_int key_len;
	93	};
	94	struct Comp {
	95	int type;
	96	int enabled;
	97	char *name;
	98	};
	99	struct Newkeys {
	100	Enc enc;
	101	Mac mac;
	102	Comp comp;
	103	};
	104	struct Kex {
	105	u_char *session_id;
	106	u_int session_id_len;
	107	Newkeys *newkeys[MODE_MAX];
	108	u_int we_need;
	109	int server;
	110	char *name;
	111	int hostkey_type;
	112	int kex_type;
	113	Buffer my;
	114	Buffer peer;
	115	sig_atomic_t done;
	116	int flags;
	117	const EVP_MD *evp_md;
	118	char *client_version_string;
	119	char *server_version_string;
	120	int (verify_host_key)(Key );
	121	Key (load_host_key)(int);
	122	int (host_key_index)(Key );
	123	void (kex[KEX_MAX])(Kex );
	124	};
	125
	126	Kex kex_setup(char [PROPOSAL_MAX]);
	127	void kex_finish(Kex *);
	128
	129	void kex_send_kexinit(Kex *);
	130	void kex_input_kexinit(int, u_int32_t, void *);
	131	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
	132
	133	Newkeys *kex_get_newkeys(int);
	134
	135	void kexdh_client(Kex *);
	136	void kexdh_server(Kex *);
	137	void kexgex_client(Kex *);
	138	void kexgex_server(Kex *);
	139
	140	void
	141	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	142	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	143	void
	144	kexgex_hash(const EVP_MD , char , char , char , int, char *,
	145	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
	146	BIGNUM , BIGNUM , u_char *, u_int );
	147
	148	void
	149	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	150
	151	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	152	void dump_digest(char , u_char , int);
	153	#endif
	154
	155	#endif