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Damien Millerd7834352006-08-05 12:39:39 +10001/* $OpenBSD: kex.h,v 1.44 2006/08/03 03:34:42 deraadt 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
Damien Miller2bdd1c12006-04-23 12:28:53 +100029#include <signal.h>
Ben Lindstrom06b33aa2001-02-15 03:01:59 +000030#include <openssl/evp.h>
Damien Millerd8337c52006-07-24 14:14:19 +100031
Damien Miller19bb3a52005-11-05 15:19:35 +110032#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"
Damien Millera63128d2006-03-15 12:08:28 +110035#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
Damien Miller33b13562000-04-04 14:38:59 +100036
Damien Miller9786e6e2005-07-26 21:54:56 +100037#define COMP_NONE 0
38#define COMP_ZLIB 1
39#define COMP_DELAYED 2
40
Damien Miller33b13562000-04-04 14:38:59 +100041enum 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
55enum kex_modes {
56 MODE_IN,
57 MODE_OUT,
58 MODE_MAX
59};
60
Damien Miller874d77b2000-10-14 16:23:11 +110061enum kex_exchange {
Damien Miller8e7fb332003-02-24 12:03:03 +110062 KEX_DH_GRP1_SHA1,
Damien Millerf675fc42004-06-15 10:30:09 +100063 KEX_DH_GRP14_SHA1,
Damien Miller8e7fb332003-02-24 12:03:03 +110064 KEX_DH_GEX_SHA1,
Damien Millera63128d2006-03-15 12:08:28 +110065 KEX_DH_GEX_SHA256,
Damien Miller8e7fb332003-02-24 12:03:03 +110066 KEX_MAX
Damien Miller874d77b2000-10-14 16:23:11 +110067};
Kevin Stevesef4eea92001-02-05 12:42:17 +000068
Ben Lindstrom2d90e002001-04-04 02:00:54 +000069#define KEX_INIT_SENT 0x0001
70
Damien Miller33b13562000-04-04 14:38:59 +100071typedef struct Kex Kex;
72typedef struct Mac Mac;
73typedef struct Comp Comp;
74typedef struct Enc Enc;
Ben Lindstrom2d90e002001-04-04 02:00:54 +000075typedef struct Newkeys Newkeys;
Damien Miller33b13562000-04-04 14:38:59 +100076
77struct Enc {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000078 char *name;
79 Cipher *cipher;
80 int enabled;
Damien Miller963f6b22002-02-19 15:21:23 +110081 u_int key_len;
82 u_int block_size;
Ben Lindstrom46c16222000-12-22 01:43:59 +000083 u_char *key;
84 u_char *iv;
Damien Miller33b13562000-04-04 14:38:59 +100085};
86struct Mac {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000087 char *name;
88 int enabled;
Ben Lindstrom6a246412002-06-06 19:48:16 +000089 const EVP_MD *md;
Damien Millereccb9de2005-06-17 12:59:34 +100090 u_int mac_len;
Ben Lindstrom46c16222000-12-22 01:43:59 +000091 u_char *key;
Damien Millereccb9de2005-06-17 12:59:34 +100092 u_int key_len;
Damien Miller33b13562000-04-04 14:38:59 +100093};
94struct Comp {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000095 int type;
96 int enabled;
97 char *name;
Damien Miller33b13562000-04-04 14:38:59 +100098};
Ben Lindstrom2d90e002001-04-04 02:00:54 +000099struct Newkeys {
100 Enc enc;
101 Mac mac;
102 Comp comp;
103};
Damien Miller33b13562000-04-04 14:38:59 +1000104struct Kex {
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000105 u_char *session_id;
Damien Millera10f5612002-09-12 09:49:15 +1000106 u_int session_id_len;
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000107 Newkeys *newkeys[MODE_MAX];
Damien Millereccb9de2005-06-17 12:59:34 +1000108 u_int we_need;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000109 int server;
110 char *name;
111 int hostkey_type;
112 int kex_type;
113 Buffer my;
114 Buffer peer;
Damien Miller97c91f62006-04-23 12:08:37 +1000115 sig_atomic_t done;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000116 int flags;
Damien Miller19bb3a52005-11-05 15:19:35 +1100117 const EVP_MD *evp_md;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000118 char *client_version_string;
119 char *server_version_string;
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000120 int (*verify_host_key)(Key *);
121 Key *(*load_host_key)(int);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000122 int (*host_key_index)(Key *);
Damien Miller8e7fb332003-02-24 12:03:03 +1100123 void (*kex[KEX_MAX])(Kex *);
Damien Miller33b13562000-04-04 14:38:59 +1000124};
125
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000126Kex *kex_setup(char *[PROPOSAL_MAX]);
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000127void kex_finish(Kex *);
Ben Lindstrom238abf62001-04-04 17:52:53 +0000128
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000129void kex_send_kexinit(Kex *);
Damien Miller630d6f42002-01-22 23:17:30 +1100130void kex_input_kexinit(int, u_int32_t, void *);
Damien Miller19bb3a52005-11-05 15:19:35 +1100131void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
Damien Miller33b13562000-04-04 14:38:59 +1000132
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000133Newkeys *kex_get_newkeys(int);
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000134
Damien Miller8e7fb332003-02-24 12:03:03 +1100135void kexdh_client(Kex *);
136void kexdh_server(Kex *);
137void kexgex_client(Kex *);
138void kexgex_server(Kex *);
139
Damien Miller19bb3a52005-11-05 15:19:35 +1100140void
Damien Miller8e7fb332003-02-24 12:03:03 +1100141kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
Damien Miller19bb3a52005-11-05 15:19:35 +1100142 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
143void
144kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
Damien Miller51b4f822006-03-26 00:04:32 +1100145 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
Damien Miller19bb3a52005-11-05 15:19:35 +1100146 BIGNUM *, BIGNUM *, u_char **, u_int *);
Damien Miller8e7fb332003-02-24 12:03:03 +1100147
Darren Tuckere4ab1152004-05-24 10:14:24 +1000148void
149derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
150
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000151#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000152void dump_digest(char *, u_char *, int);
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000153#endif
154
Damien Miller33b13562000-04-04 14:38:59 +1000155#endif