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Commit	Line	Data
	1	/* $OpenBSD: kex.h,v 1.47 2009/05/27 06:34:36 andreas 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_COOKIE_LEN 16
	34
	35	#define KEX_DH1 "diffie-hellman-group1-sha1"
	36	#define KEX_DH14 "diffie-hellman-group14-sha1"
	37	#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
	38	#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
	39
	40	#define COMP_NONE 0
	41	#define COMP_ZLIB 1
	42	#define COMP_DELAYED 2
	43
	44	enum kex_init_proposals {
	45	PROPOSAL_KEX_ALGS,
	46	PROPOSAL_SERVER_HOST_KEY_ALGS,
	47	PROPOSAL_ENC_ALGS_CTOS,
	48	PROPOSAL_ENC_ALGS_STOC,
	49	PROPOSAL_MAC_ALGS_CTOS,
	50	PROPOSAL_MAC_ALGS_STOC,
	51	PROPOSAL_COMP_ALGS_CTOS,
	52	PROPOSAL_COMP_ALGS_STOC,
	53	PROPOSAL_LANG_CTOS,
	54	PROPOSAL_LANG_STOC,
	55	PROPOSAL_MAX
	56	};
	57
	58	enum kex_modes {
	59	MODE_IN,
	60	MODE_OUT,
	61	MODE_MAX
	62	};
	63
	64	enum kex_exchange {
	65	KEX_DH_GRP1_SHA1,
	66	KEX_DH_GRP14_SHA1,
	67	KEX_DH_GEX_SHA1,
	68	KEX_DH_GEX_SHA256,
	69	KEX_MAX
	70	};
	71
	72	#define KEX_INIT_SENT 0x0001
	73
	74	typedef struct Kex Kex;
	75	typedef struct Mac Mac;
	76	typedef struct Comp Comp;
	77	typedef struct Enc Enc;
	78	typedef struct Newkeys Newkeys;
	79
	80	struct Enc {
	81	char *name;
	82	Cipher *cipher;
	83	int enabled;
	84	u_int key_len;
	85	u_int block_size;
	86	u_char *key;
	87	u_char *iv;
	88	};
	89	struct Mac {
	90	char *name;
	91	int enabled;
	92	u_int mac_len;
	93	u_char *key;
	94	u_int key_len;
	95	int type;
	96	const EVP_MD *evp_md;
	97	HMAC_CTX evp_ctx;
	98	struct umac_ctx *umac_ctx;
	99	};
	100	struct Comp {
	101	int type;
	102	int enabled;
	103	char *name;
	104	};
	105	struct Newkeys {
	106	Enc enc;
	107	Mac mac;
	108	Comp comp;
	109	};
	110	struct Kex {
	111	u_char *session_id;
	112	u_int session_id_len;
	113	Newkeys *newkeys[MODE_MAX];
	114	u_int we_need;
	115	int server;
	116	char *name;
	117	int hostkey_type;
	118	int kex_type;
	119	Buffer my;
	120	Buffer peer;
	121	sig_atomic_t done;
	122	int flags;
	123	const EVP_MD *evp_md;
	124	char *client_version_string;
	125	char *server_version_string;
	126	int (verify_host_key)(Key );
	127	Key (load_host_key)(int);
	128	int (host_key_index)(Key );
	129	void (kex[KEX_MAX])(Kex );
	130	};
	131
	132	Kex kex_setup(char [PROPOSAL_MAX]);
	133	void kex_finish(Kex *);
	134
	135	void kex_send_kexinit(Kex *);
	136	void kex_input_kexinit(int, u_int32_t, void *);
	137	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
	138
	139	Newkeys *kex_get_newkeys(int);
	140
	141	void kexdh_client(Kex *);
	142	void kexdh_server(Kex *);
	143	void kexgex_client(Kex *);
	144	void kexgex_server(Kex *);
	145
	146	void
	147	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	148	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	149	void
	150	kexgex_hash(const EVP_MD , char , char , char , int, char *,
	151	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
	152	BIGNUM , BIGNUM , u_char *, u_int );
	153
	154	void
	155	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	156
	157	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	158	void dump_digest(char , u_char , int);
	159	#endif
	160
	161	#endif