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/* $OpenBSD: kex.h,v 1.52 2010/09/22 05:01:29 djm 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 <openssl/evp.h>
#include <openssl/ec.h>
#include "mac.h"
#ifdef WITH_LEAKMALLOC
#include "leakmalloc.h"
#endif
#define KEX_COOKIE_LEN 16
#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 KEX_RESUME "resume@appgate.com"
/* The following represents the family of ECDH methods */
#define KEX_ECDH_SHA2_STEM "ecdh-sha2-"
#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_ECDH_SHA2,
KEX_MAX
};
#define KEX_INIT_SENT 0x0001
typedef struct Kex Kex;
typedef struct sshmac 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 Comp {
int type;
int enabled;
char *name;
};
struct Newkeys {
Enc enc;
Mac mac;
Comp comp;
};
struct ssh;
struct Kex {
u_char *session_id;
size_t session_id_len;
Newkeys *newkeys[MODE_MAX];
u_int we_need;
int server;
char *name;
int hostkey_type;
int kex_type;
int roaming;
struct sshbuf *my;
struct sshbuf *peer;
sig_atomic_t done;
int flags;
const EVP_MD *evp_md;
char *client_version_string;
char *server_version_string;
int (*verify_host_key)(struct sshkey *, struct ssh *);
struct sshkey *(*load_host_public_key)(int, struct ssh *);
struct sshkey *(*load_host_private_key)(int, struct ssh *);
int (*host_key_index)(struct sshkey *);
int (*kex[KEX_MAX])(struct ssh *);
/* kex specific state */
DH *dh; /* DH */
int min, max, nbits; /* GEX */
EC_KEY *ec_client_key; /* ECÐH */
const EC_GROUP *ec_group; /* ECÐH */
};
int kex_names_valid(const char *);
int kex_new(struct ssh *, char *[PROPOSAL_MAX], Kex **);
int kex_setup(struct ssh *, char *[PROPOSAL_MAX]);
void kex_free_newkeys(Newkeys *);
void kex_free(Kex *);
int kex_buf2prop(struct sshbuf *, int *, char ***);
int kex_prop2buf(struct sshbuf *, char *proposal[PROPOSAL_MAX]);
void kex_prop_free(char **);
int kex_send_kexinit(struct ssh *);
int kex_input_kexinit(int, u_int32_t, struct ssh *);
int kex_derive_keys(struct ssh *, u_char *, u_int, BIGNUM *);
int kex_send_newkeys(struct ssh *);
Newkeys *kex_get_newkeys(struct ssh *, int);
int kexdh_client(struct ssh *);
int kexdh_server(struct ssh *);
int kexgex_client(struct ssh *);
int kexgex_server(struct ssh *);
int kexecdh_client(struct ssh *);
int kexecdh_server(struct ssh *);
int
kex_dh_hash(char *, char *, char *, size_t, char *, size_t, u_char *, size_t,
BIGNUM *, BIGNUM *, BIGNUM *, u_char **, size_t *);
int
kexgex_hash(const EVP_MD *, char *, char *, char *, size_t, char *,
size_t, u_char *, size_t, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
BIGNUM *, BIGNUM *, u_char **, size_t *);
int
kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, size_t,
char *, size_t, u_char *, size_t, const EC_POINT *, const EC_POINT *,
const BIGNUM *, u_char **, size_t *);
int kex_ecdh_name_to_nid(const char *);
const EVP_MD *kex_ecdh_name_to_evpmd(const char *);
int
derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
void dump_digest(char *, u_char *, int);
#endif
#endif
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