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Commit	Line	Data
	1	/* $OpenBSD: kex.h,v 1.46 2007/06/07 19:37:34 pvalchev 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	#include <openssl/hmac.h>
	32
	33	#define KEX_DH1 "diffie-hellman-group1-sha1"
	34	#define KEX_DH14 "diffie-hellman-group14-sha1"
	35	#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
	36	#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
	37
	38	#define COMP_NONE 0
	39	#define COMP_ZLIB 1
	40	#define COMP_DELAYED 2
	41
	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 {
	63	KEX_DH_GRP1_SHA1,
	64	KEX_DH_GRP14_SHA1,
	65	KEX_DH_GEX_SHA1,
	66	KEX_DH_GEX_SHA256,
	67	KEX_MAX
	68	};
	69
	70	#define KEX_INIT_SENT 0x0001
	71
	72	typedef struct Kex Kex;
	73	typedef struct Mac Mac;
	74	typedef struct Comp Comp;
	75	typedef struct Enc Enc;
	76	typedef struct Newkeys Newkeys;
	77
	78	struct Enc {
	79	char *name;
	80	Cipher *cipher;
	81	int enabled;
	82	u_int key_len;
	83	u_int block_size;
	84	u_char *key;
	85	u_char *iv;
	86	};
	87	struct Mac {
	88	char *name;
	89	int enabled;
	90	u_int mac_len;
	91	u_char *key;
	92	u_int key_len;
	93	int type;
	94	const EVP_MD *evp_md;
	95	HMAC_CTX evp_ctx;
	96	struct umac_ctx *umac_ctx;
	97	};
	98	struct Comp {
	99	int type;
	100	int enabled;
	101	char *name;
	102	};
	103	struct Newkeys {
	104	Enc enc;
	105	Mac mac;
	106	Comp comp;
	107	};
	108	struct Kex {
	109	u_char *session_id;
	110	u_int session_id_len;
	111	Newkeys *newkeys[MODE_MAX];
	112	u_int we_need;
	113	int server;
	114	char *name;
	115	int hostkey_type;
	116	int kex_type;
	117	Buffer my;
	118	Buffer peer;
	119	sig_atomic_t done;
	120	int flags;
	121	const EVP_MD *evp_md;
	122	char *client_version_string;
	123	char *server_version_string;
	124	int (verify_host_key)(Key );
	125	Key (load_host_key)(int);
	126	int (host_key_index)(Key );
	127	void (kex[KEX_MAX])(Kex );
	128	};
	129
	130	Kex kex_setup(char [PROPOSAL_MAX]);
	131	void kex_finish(Kex *);
	132
	133	void kex_send_kexinit(Kex *);
	134	void kex_input_kexinit(int, u_int32_t, void *);
	135	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
	136
	137	Newkeys *kex_get_newkeys(int);
	138
	139	void kexdh_client(Kex *);
	140	void kexdh_server(Kex *);
	141	void kexgex_client(Kex *);
	142	void kexgex_server(Kex *);
	143
	144	void
	145	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	146	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	147	void
	148	kexgex_hash(const EVP_MD , char , char , char , int, char *,
	149	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
	150	BIGNUM , BIGNUM , u_char *, u_int );
	151
	152	void
	153	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	154
	155	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	156	void dump_digest(char , u_char , int);
	157	#endif
	158
	159	#endif