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9786e6e2a0
[kex.c kex.h myproposal.h packet.c packet.h servconf.c session.c]
[sshconnect2.c sshd.c sshd_config sshd_config.5]
add a new compression method that delays compression until the user
has been authenticated successfully and set compression to 'delayed'
for sshd.
this breaks older openssh clients (< 3.5) if they insist on
compression, so you have to re-enable compression in sshd_config.
ok djm@
154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/* $OpenBSD: kex.h,v 1.37 2005/07/25 11:59:39 markus Exp $ */
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/*
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* Copyright (c) 2000, 2001 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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#include "cipher.h"
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#include "key.h"
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#define KEX_DH1 "diffie-hellman-group1-sha1"
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#define KEX_DH14 "diffie-hellman-group14-sha1"
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#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
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#define COMP_NONE 0
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#define COMP_ZLIB 1
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#define COMP_DELAYED 2
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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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KEX_DH_GRP1_SHA1,
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KEX_DH_GRP14_SHA1,
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KEX_DH_GEX_SHA1,
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KEX_MAX
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};
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#define KEX_INIT_SENT 0x0001
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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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typedef struct Newkeys Newkeys;
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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_int key_len;
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u_int block_size;
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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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const EVP_MD *md;
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u_int mac_len;
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u_char *key;
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u_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 Newkeys {
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Enc enc;
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Mac mac;
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Comp comp;
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};
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struct Kex {
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u_char *session_id;
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u_int session_id_len;
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Newkeys *newkeys[MODE_MAX];
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u_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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Buffer my;
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Buffer peer;
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int done;
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int flags;
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char *client_version_string;
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char *server_version_string;
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int (*verify_host_key)(Key *);
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Key *(*load_host_key)(int);
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int (*host_key_index)(Key *);
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void (*kex[KEX_MAX])(Kex *);
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};
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Kex *kex_setup(char *[PROPOSAL_MAX]);
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void kex_finish(Kex *);
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void kex_send_kexinit(Kex *);
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void kex_input_kexinit(int, u_int32_t, void *);
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void kex_derive_keys(Kex *, u_char *, BIGNUM *);
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Newkeys *kex_get_newkeys(int);
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void kexdh_client(Kex *);
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void kexdh_server(Kex *);
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void kexgex_client(Kex *);
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void kexgex_server(Kex *);
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u_char *
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kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
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BIGNUM *, BIGNUM *, BIGNUM *);
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u_char *
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kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int,
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int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *);
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void
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derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
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#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
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void dump_digest(char *, u_char *, int);
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#endif
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#endif
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