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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_GSS_GRP1_SHA1,
	70	KEX_GSS_GRP14_SHA1,
	71	KEX_GSS_GEX_SHA1,
	72	KEX_MAX
	73	};
	74
	75	#define KEX_INIT_SENT 0x0001
	76
	77	typedef struct Kex Kex;
	78	typedef struct Mac Mac;
	79	typedef struct Comp Comp;
	80	typedef struct Enc Enc;
	81	typedef struct Newkeys Newkeys;
	82
	83	struct Enc {
	84	char *name;
	85	Cipher *cipher;
	86	int enabled;
	87	u_int key_len;
	88	u_int block_size;
	89	u_char *key;
	90	u_char *iv;
	91	};
	92	struct Mac {
	93	char *name;
	94	int enabled;
	95	u_int mac_len;
	96	u_char *key;
	97	u_int key_len;
	98	int type;
	99	const EVP_MD *evp_md;
	100	HMAC_CTX evp_ctx;
	101	struct umac_ctx *umac_ctx;
	102	};
	103	struct Comp {
	104	int type;
	105	int enabled;
	106	char *name;
	107	};
	108	struct Newkeys {
	109	Enc enc;
	110	Mac mac;
	111	Comp comp;
	112	};
	113
	114	struct Kex {
	115	u_char *session_id;
	116	u_int session_id_len;
	117	Newkeys *newkeys[MODE_MAX];
	118	u_int we_need;
	119	int server;
	120	char *name;
	121	int hostkey_type;
	122	int kex_type;
	123	Buffer my;
	124	Buffer peer;
	125	sig_atomic_t done;
	126	int flags;
	127	const EVP_MD *evp_md;
	128	#ifdef GSSAPI
	129	int gss_deleg_creds;
	130	int gss_trust_dns;
	131	char *gss_host;
	132	char *gss_client;
	133	#endif
	134	char *client_version_string;
	135	char *server_version_string;
	136	int (verify_host_key)(Key );
	137	Key (load_host_key)(int);
	138	int (host_key_index)(Key );
	139	void (kex[KEX_MAX])(Kex );
	140	};
	141
	142	void kex_prop2buf(Buffer , char proposal[PROPOSAL_MAX]);
	143
	144	Kex kex_setup(char [PROPOSAL_MAX]);
	145	void kex_finish(Kex *);
	146
	147	void kex_send_kexinit(Kex *);
	148	void kex_input_kexinit(int, u_int32_t, void *);
	149	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
	150
	151	Newkeys *kex_get_newkeys(int);
	152
	153	void kexdh_client(Kex *);
	154	void kexdh_server(Kex *);
	155	void kexgex_client(Kex *);
	156	void kexgex_server(Kex *);
	157
	158	#ifdef GSSAPI
	159	void kexgss_client(Kex *);
	160	void kexgss_server(Kex *);
	161	#endif
	162
	163	void
	164	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
	165	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	166	void
	167	kexgex_hash(const EVP_MD , char , char , char , int, char *,
	168	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
	169	BIGNUM , BIGNUM , u_char *, u_int );
	170
	171	void
	172	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	173
	174	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	175	void dump_digest(char , u_char , int);
	176	#endif
	177
	178	#endif