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Damien Millerf675fc42004-06-15 10:30:09 +10001/* $OpenBSD: kex.h,v 1.35 2004/06/13 12:53:24 djm Exp $ */
Ben Lindstrom36579d32001-01-29 07:39:26 +00002
Damien Miller33b13562000-04-04 14:38:59 +10003/*
Ben Lindstrom44697232001-07-04 03:32:30 +00004 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Damien Miller33b13562000-04-04 14:38:59 +10005 *
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.
Damien Miller33b13562000-04-04 14:38:59 +100014 *
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
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000029#include <openssl/evp.h>
30#include "buffer.h"
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +000031#include "cipher.h"
32#include "key.h"
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000033
Damien Miller874d77b2000-10-14 16:23:11 +110034#define KEX_DH1 "diffie-hellman-group1-sha1"
Damien Millerf675fc42004-06-15 10:30:09 +100035#define KEX_DH14 "diffie-hellman-group14-sha1"
Damien Miller874d77b2000-10-14 16:23:11 +110036#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
Damien Miller33b13562000-04-04 14:38:59 +100037
38enum kex_init_proposals {
39 PROPOSAL_KEX_ALGS,
40 PROPOSAL_SERVER_HOST_KEY_ALGS,
41 PROPOSAL_ENC_ALGS_CTOS,
42 PROPOSAL_ENC_ALGS_STOC,
43 PROPOSAL_MAC_ALGS_CTOS,
44 PROPOSAL_MAC_ALGS_STOC,
45 PROPOSAL_COMP_ALGS_CTOS,
46 PROPOSAL_COMP_ALGS_STOC,
47 PROPOSAL_LANG_CTOS,
48 PROPOSAL_LANG_STOC,
49 PROPOSAL_MAX
50};
51
52enum kex_modes {
53 MODE_IN,
54 MODE_OUT,
55 MODE_MAX
56};
57
Damien Miller874d77b2000-10-14 16:23:11 +110058enum kex_exchange {
Damien Miller8e7fb332003-02-24 12:03:03 +110059 KEX_DH_GRP1_SHA1,
Damien Millerf675fc42004-06-15 10:30:09 +100060 KEX_DH_GRP14_SHA1,
Damien Miller8e7fb332003-02-24 12:03:03 +110061 KEX_DH_GEX_SHA1,
62 KEX_MAX
Damien Miller874d77b2000-10-14 16:23:11 +110063};
Kevin Stevesef4eea92001-02-05 12:42:17 +000064
Ben Lindstrom2d90e002001-04-04 02:00:54 +000065#define KEX_INIT_SENT 0x0001
66
Damien Miller33b13562000-04-04 14:38:59 +100067typedef struct Kex Kex;
68typedef struct Mac Mac;
69typedef struct Comp Comp;
70typedef struct Enc Enc;
Ben Lindstrom2d90e002001-04-04 02:00:54 +000071typedef struct Newkeys Newkeys;
Damien Miller33b13562000-04-04 14:38:59 +100072
73struct Enc {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000074 char *name;
75 Cipher *cipher;
76 int enabled;
Damien Miller963f6b22002-02-19 15:21:23 +110077 u_int key_len;
78 u_int block_size;
Ben Lindstrom46c16222000-12-22 01:43:59 +000079 u_char *key;
80 u_char *iv;
Damien Miller33b13562000-04-04 14:38:59 +100081};
82struct Mac {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000083 char *name;
84 int enabled;
Ben Lindstrom6a246412002-06-06 19:48:16 +000085 const EVP_MD *md;
Ben Lindstrom2d90e002001-04-04 02:00:54 +000086 int mac_len;
Ben Lindstrom46c16222000-12-22 01:43:59 +000087 u_char *key;
Ben Lindstrom2d90e002001-04-04 02:00:54 +000088 int key_len;
Damien Miller33b13562000-04-04 14:38:59 +100089};
90struct Comp {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000091 int type;
92 int enabled;
93 char *name;
Damien Miller33b13562000-04-04 14:38:59 +100094};
Ben Lindstrom2d90e002001-04-04 02:00:54 +000095struct Newkeys {
96 Enc enc;
97 Mac mac;
98 Comp comp;
99};
Damien Miller33b13562000-04-04 14:38:59 +1000100struct Kex {
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000101 u_char *session_id;
Damien Millera10f5612002-09-12 09:49:15 +1000102 u_int session_id_len;
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000103 Newkeys *newkeys[MODE_MAX];
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000104 int we_need;
105 int server;
106 char *name;
107 int hostkey_type;
108 int kex_type;
109 Buffer my;
110 Buffer peer;
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000111 int done;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000112 int flags;
113 char *client_version_string;
114 char *server_version_string;
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000115 int (*verify_host_key)(Key *);
116 Key *(*load_host_key)(int);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000117 int (*host_key_index)(Key *);
Damien Miller8e7fb332003-02-24 12:03:03 +1100118 void (*kex[KEX_MAX])(Kex *);
Damien Miller33b13562000-04-04 14:38:59 +1000119};
120
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000121Kex *kex_setup(char *[PROPOSAL_MAX]);
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000122void kex_finish(Kex *);
Ben Lindstrom238abf62001-04-04 17:52:53 +0000123
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000124void kex_send_kexinit(Kex *);
Damien Miller630d6f42002-01-22 23:17:30 +1100125void kex_input_kexinit(int, u_int32_t, void *);
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000126void kex_derive_keys(Kex *, u_char *, BIGNUM *);
Damien Miller33b13562000-04-04 14:38:59 +1000127
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000128Newkeys *kex_get_newkeys(int);
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000129
Damien Miller8e7fb332003-02-24 12:03:03 +1100130void kexdh_client(Kex *);
131void kexdh_server(Kex *);
132void kexgex_client(Kex *);
133void kexgex_server(Kex *);
134
135u_char *
136kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
137 BIGNUM *, BIGNUM *, BIGNUM *);
138u_char *
139kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int,
140 int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *);
141
Darren Tuckere4ab1152004-05-24 10:14:24 +1000142void
143derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
144
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000145#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000146void dump_digest(char *, u_char *, int);
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000147#endif
148
Damien Miller33b13562000-04-04 14:38:59 +1000149#endif