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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_GSS_GRP1_SHA1,
	67	KEX_GSS_GRP14_SHA1,
	68	KEX_GSS_GEX_SHA1,
	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	const EVP_MD *md;
	93	u_int mac_len;
	94	u_char *key;
	95	u_int key_len;
	96	};
	97	struct Comp {
	98	int type;
	99	int enabled;
	100	char *name;
	101	};
	102	struct Newkeys {
	103	Enc enc;
	104	Mac mac;
	105	Comp comp;
	106	};
	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	#ifdef GSSAPI
	123	int gss_deleg_creds;
	124	int gss_trust_dns;
	125	char *gss_host;
	126	#endif
	127	char *client_version_string;
	128	char *server_version_string;
	129	int (verify_host_key)(Key );
	130	Key (load_host_key)(int);
	131	int (host_key_index)(Key );
	132	void (kex[KEX_MAX])(Kex );
	133	};
	134
	135	void kex_prop2buf(Buffer , char proposal[PROPOSAL_MAX]);
	136
	137	Kex kex_setup(char [PROPOSAL_MAX]);
	138	void kex_finish(Kex *);
	139
	140	void kex_send_kexinit(Kex *);
	141	void kex_input_kexinit(int, u_int32_t, void *);
	142	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
	143
	144	Newkeys *kex_get_newkeys(int);
	145
	146	void kexdh_client(Kex *);
	147	void kexdh_server(Kex *);
	148	void kexgex_client(Kex *);
	149	void kexgex_server(Kex *);
	150
	151	#ifdef GSSAPI
	152	void kexgss_client(Kex *);
	153	void kexgss_server(Kex *);
	154	#endif
	155
	156	void
	157	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	158	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	159	void
	160	kexgex_hash(const EVP_MD , char , char , char , int, char *,
	161	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
	162	BIGNUM , BIGNUM , u_char *, u_int );
	163
	164	void
	165	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	166
	167	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	168	void dump_digest(char , u_char , int);
	169	#endif
	170
	171	#endif