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4c4f05e096
[kex.c kex.h sshconnect2.c sshd.c]
generate a 2*need size (~300 instead of 1024/2048) random private
exponent during the DH key agreement. according to Niels (the great
german advisor) this is safe since /etc/primes contains strong
primes only.
References:
P. C. van Oorschot and M. J. Wiener, On Diffie-Hellman key
agreement with short exponents, In Advances in Cryptology
- EUROCRYPT'96, LNCS 1070, Springer-Verlag, 1996, pp.332-343.
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* $OpenBSD: kex.h,v 1.15 2001/03/05 17:17:20 markus Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef KEX_H
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#define KEX_H
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#include <openssl/evp.h>
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#include "buffer.h"
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#define KEX_DH1 "diffie-hellman-group1-sha1"
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#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
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enum kex_init_proposals {
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PROPOSAL_KEX_ALGS,
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PROPOSAL_SERVER_HOST_KEY_ALGS,
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PROPOSAL_ENC_ALGS_CTOS,
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PROPOSAL_ENC_ALGS_STOC,
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PROPOSAL_MAC_ALGS_CTOS,
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PROPOSAL_MAC_ALGS_STOC,
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PROPOSAL_COMP_ALGS_CTOS,
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PROPOSAL_COMP_ALGS_STOC,
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PROPOSAL_LANG_CTOS,
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PROPOSAL_LANG_STOC,
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PROPOSAL_MAX
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};
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enum kex_modes {
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MODE_IN,
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MODE_OUT,
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MODE_MAX
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};
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enum kex_exchange {
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DH_GRP1_SHA1,
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DH_GEX_SHA1
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};
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typedef struct Kex Kex;
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typedef struct Mac Mac;
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typedef struct Comp Comp;
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typedef struct Enc Enc;
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struct Enc {
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char *name;
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Cipher *cipher;
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int enabled;
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u_char *key;
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u_char *iv;
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};
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struct Mac {
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char *name;
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int enabled;
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EVP_MD *md;
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int mac_len;
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u_char *key;
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int key_len;
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};
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struct Comp {
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int type;
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int enabled;
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char *name;
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};
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struct Kex {
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Enc enc [MODE_MAX];
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Mac mac [MODE_MAX];
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Comp comp[MODE_MAX];
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int we_need;
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int server;
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char *name;
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int hostkey_type;
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int kex_type;
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};
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Buffer *kex_init(char *myproposal[PROPOSAL_MAX]);
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void
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kex_exchange_kexinit(
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Buffer *my_kexinit, Buffer *peer_kexint,
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char *peer_proposal[PROPOSAL_MAX]);
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Kex *
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kex_choose_conf(char *cprop[PROPOSAL_MAX],
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char *sprop[PROPOSAL_MAX], int server);
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int kex_derive_keys(Kex *k, u_char *hash, BIGNUM *shared_secret);
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void packet_set_kex(Kex *k);
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int dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
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DH *dh_new_group_asc(const char *, const char *);
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DH *dh_new_group(BIGNUM *, BIGNUM *);
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void dh_gen_key(DH *, int);
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DH *dh_new_group1(void);
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u_char *
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kex_hash(
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char *client_version_string,
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char *server_version_string,
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char *ckexinit, int ckexinitlen,
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char *skexinit, int skexinitlen,
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char *serverhostkeyblob, int sbloblen,
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BIGNUM *client_dh_pub,
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BIGNUM *server_dh_pub,
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BIGNUM *shared_secret);
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u_char *
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kex_hash_gex(
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char *client_version_string,
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char *server_version_string,
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char *ckexinit, int ckexinitlen,
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char *skexinit, int skexinitlen,
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char *serverhostkeyblob, int sbloblen,
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int minbits, BIGNUM *prime, BIGNUM *gen,
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BIGNUM *client_dh_pub,
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BIGNUM *server_dh_pub,
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BIGNUM *shared_secret);
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#endif
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