[gssapi-openssh.git] / openssh / kex.h

/* $OpenBSD: kex.h,v 1.44 2006/08/03 03:34:42 deraadt Exp $ */

/*
 * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef KEX_H
#define KEX_H

#include <signal.h>
#include <openssl/evp.h>

#define	KEX_DH1			"diffie-hellman-group1-sha1"
#define	KEX_DH14		"diffie-hellman-group14-sha1"
#define	KEX_DHGEX_SHA1		"diffie-hellman-group-exchange-sha1"
#define	KEX_DHGEX_SHA256	"diffie-hellman-group-exchange-sha256"

#define COMP_NONE	0
#define COMP_ZLIB	1
#define COMP_DELAYED	2

enum kex_init_proposals {
	PROPOSAL_KEX_ALGS,
	PROPOSAL_SERVER_HOST_KEY_ALGS,
	PROPOSAL_ENC_ALGS_CTOS,
	PROPOSAL_ENC_ALGS_STOC,
	PROPOSAL_MAC_ALGS_CTOS,
	PROPOSAL_MAC_ALGS_STOC,
	PROPOSAL_COMP_ALGS_CTOS,
	PROPOSAL_COMP_ALGS_STOC,
	PROPOSAL_LANG_CTOS,
	PROPOSAL_LANG_STOC,
	PROPOSAL_MAX
};

enum kex_modes {
	MODE_IN,
	MODE_OUT,
	MODE_MAX
};

enum kex_exchange {
	KEX_DH_GRP1_SHA1,
	KEX_DH_GRP14_SHA1,
	KEX_DH_GEX_SHA1,
	KEX_DH_GEX_SHA256,
	KEX_GSS_GRP1_SHA1,
	KEX_GSS_GRP14_SHA1,
	KEX_GSS_GEX_SHA1,
	KEX_MAX
};

#define KEX_INIT_SENT	0x0001

typedef struct Kex Kex;
typedef struct Mac Mac;
typedef struct Comp Comp;
typedef struct Enc Enc;
typedef struct Newkeys Newkeys;

struct Enc {
	char	*name;
	Cipher	*cipher;
	int	enabled;
	u_int	key_len;
	u_int	block_size;
	u_char	*key;
	u_char	*iv;
};
struct Mac {
	char	*name;
	int	enabled;
	const EVP_MD	*md;
	u_int	mac_len;
	u_char	*key;
	u_int	key_len;
};
struct Comp {
	int	type;
	int	enabled;
	char	*name;
};
struct Newkeys {
	Enc	enc;
	Mac	mac;
	Comp	comp;
};
struct Kex {
	u_char	*session_id;
	u_int	session_id_len;
	Newkeys	*newkeys[MODE_MAX];
	u_int	we_need;
	int	server;
	char	*name;
	int	hostkey_type;
	int	kex_type;
	Buffer	my;
	Buffer	peer;
	sig_atomic_t done;
	int	flags;
	const EVP_MD *evp_md;
#ifdef GSSAPI
	int	gss_deleg_creds;
	int	gss_trust_dns;
	char    *gss_host;
#endif
	char	*client_version_string;
	char	*server_version_string;
	int	(*verify_host_key)(Key *);
	Key	*(*load_host_key)(int);
	int	(*host_key_index)(Key *);
	void	(*kex[KEX_MAX])(Kex *);
};

Kex	*kex_setup(char *[PROPOSAL_MAX]);
void	 kex_finish(Kex *);

void	 kex_send_kexinit(Kex *);
void	 kex_input_kexinit(int, u_int32_t, void *);
void	 kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);

Newkeys *kex_get_newkeys(int);

void	 kexdh_client(Kex *);
void	 kexdh_server(Kex *);
void	 kexgex_client(Kex *);
void	 kexgex_server(Kex *);

#ifdef GSSAPI
void	kexgss_client(Kex *);
void	kexgss_server(Kex *);
#endif

void
kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
    BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
void
kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
    int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
    BIGNUM *, BIGNUM *, u_char **, u_int *);

void
derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);

#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
void	dump_digest(char *, u_char *, int);
#endif

#endif
Commit	Line	Data
9108f8d9	1	/* $OpenBSD: kex.h,v 1.44 2006/08/03 03:34:42 deraadt Exp $ */
3c0ef626	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
9108f8d9	29	#include <signal.h>
3c0ef626	30	#include <openssl/evp.h>
3c0ef626	31
2c06c99b	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"
9108f8d9	35	#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
3c0ef626	36
665a873d	37	#define COMP_NONE 0
	38	#define COMP_ZLIB 1
	39	#define COMP_DELAYED 2
	40
3c0ef626	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 {
6a9b3198	62	KEX_DH_GRP1_SHA1,
c9f39d2c	63	KEX_DH_GRP14_SHA1,
6a9b3198	64	KEX_DH_GEX_SHA1,
9108f8d9	65	KEX_DH_GEX_SHA256,
70e5f740	66	KEX_GSS_GRP1_SHA1,
	67	KEX_GSS_GRP14_SHA1,
	68	KEX_GSS_GEX_SHA1,
6a9b3198	69	KEX_MAX
3c0ef626	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;
e9a17296	84	u_int key_len;
e9a17296	85	u_int block_size;
3c0ef626	86	u_char *key;
	87	u_char *iv;
	88	};
	89	struct Mac {
	90	char *name;
	91	int enabled;
f5799ae1	92	const EVP_MD *md;
665a873d	93	u_int mac_len;
3c0ef626	94	u_char *key;
665a873d	95	u_int key_len;
3c0ef626	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	struct Kex {
	108	u_char *session_id;
41b2f314	109	u_int session_id_len;
3c0ef626	110	Newkeys *newkeys[MODE_MAX];
665a873d	111	u_int we_need;
3c0ef626	112	int server;
	113	char *name;
	114	int hostkey_type;
	115	int kex_type;
	116	Buffer my;
	117	Buffer peer;
9108f8d9	118	sig_atomic_t done;
3c0ef626	119	int flags;
2c06c99b	120	const EVP_MD *evp_md;
70e5f740	121	#ifdef GSSAPI
	122	int gss_deleg_creds;
	123	int gss_trust_dns;
	124	char *gss_host;
	125	#endif
3c0ef626	126	char *client_version_string;
	127	char *server_version_string;
	128	int (verify_host_key)(Key );
	129	Key (load_host_key)(int);
700318f3	130	int (host_key_index)(Key );
6a9b3198	131	void (kex[KEX_MAX])(Kex );
3c0ef626	132	};
	133
	134	Kex kex_setup(char [PROPOSAL_MAX]);
	135	void kex_finish(Kex *);
	136
	137	void kex_send_kexinit(Kex *);
e9a17296	138	void kex_input_kexinit(int, u_int32_t, void *);
2c06c99b	139	void kex_derive_keys(Kex , u_char , u_int, BIGNUM *);
3c0ef626	140
3c0ef626	141	Newkeys *kex_get_newkeys(int);
3c0ef626	142
6a9b3198	143	void kexdh_client(Kex *);
	144	void kexdh_server(Kex *);
	145	void kexgex_client(Kex *);
	146	void kexgex_server(Kex *);
	147
70e5f740	148	#ifdef GSSAPI
	149	void kexgss_client(Kex *);
	150	void kexgss_server(Kex *);
	151	#endif
	152
2c06c99b	153	void
6a9b3198	154	kex_dh_hash(char , char , char , int, char , int, u_char *, int,
2c06c99b	155	BIGNUM , BIGNUM , BIGNUM , u_char , u_int );
	156	void
	157	kexgex_hash(const EVP_MD , char , char , char , int, char *,
9108f8d9	158	int, u_char , int, int, int, int, BIGNUM , BIGNUM , BIGNUM ,
2c06c99b	159	BIGNUM , BIGNUM , u_char *, u_int );
6a9b3198	160
c9f39d2c	161	void
	162	derive_ssh1_session_id(BIGNUM , BIGNUM , u_int8_t[8], u_int8_t[16]);
	163
3c0ef626	164	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	165	void dump_digest(char , u_char , int);
	166	#endif
	167
	168	#endif