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Darren Tucker5b48cdd2009-06-21 18:15:25 +10001/* $OpenBSD: kex.h,v 1.47 2009/05/27 06:34:36 andreas 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>
Darren Tucker5f3d5be2007-06-05 18:30:18 +100031#include <openssl/hmac.h>
Damien Millerd8337c52006-07-24 14:14:19 +100032
Darren Tucker5b48cdd2009-06-21 18:15:25 +100033#define KEX_COOKIE_LEN 16
34
Damien Miller19bb3a52005-11-05 15:19:35 +110035#define KEX_DH1 "diffie-hellman-group1-sha1"
36#define KEX_DH14 "diffie-hellman-group14-sha1"
37#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
Damien Millera63128d2006-03-15 12:08:28 +110038#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
Damien Miller33b13562000-04-04 14:38:59 +100039
Damien Miller9786e6e2005-07-26 21:54:56 +100040#define COMP_NONE 0
41#define COMP_ZLIB 1
42#define COMP_DELAYED 2
43
Damien Miller33b13562000-04-04 14:38:59 +100044enum kex_init_proposals {
45 PROPOSAL_KEX_ALGS,
46 PROPOSAL_SERVER_HOST_KEY_ALGS,
47 PROPOSAL_ENC_ALGS_CTOS,
48 PROPOSAL_ENC_ALGS_STOC,
49 PROPOSAL_MAC_ALGS_CTOS,
50 PROPOSAL_MAC_ALGS_STOC,
51 PROPOSAL_COMP_ALGS_CTOS,
52 PROPOSAL_COMP_ALGS_STOC,
53 PROPOSAL_LANG_CTOS,
54 PROPOSAL_LANG_STOC,
55 PROPOSAL_MAX
56};
57
58enum kex_modes {
59 MODE_IN,
60 MODE_OUT,
61 MODE_MAX
62};
63
Damien Miller874d77b2000-10-14 16:23:11 +110064enum kex_exchange {
Damien Miller8e7fb332003-02-24 12:03:03 +110065 KEX_DH_GRP1_SHA1,
Damien Millerf675fc42004-06-15 10:30:09 +100066 KEX_DH_GRP14_SHA1,
Damien Miller8e7fb332003-02-24 12:03:03 +110067 KEX_DH_GEX_SHA1,
Damien Millera63128d2006-03-15 12:08:28 +110068 KEX_DH_GEX_SHA256,
Damien Miller8e7fb332003-02-24 12:03:03 +110069 KEX_MAX
Damien Miller874d77b2000-10-14 16:23:11 +110070};
Kevin Stevesef4eea92001-02-05 12:42:17 +000071
Ben Lindstrom2d90e002001-04-04 02:00:54 +000072#define KEX_INIT_SENT 0x0001
73
Damien Miller33b13562000-04-04 14:38:59 +100074typedef struct Kex Kex;
75typedef struct Mac Mac;
76typedef struct Comp Comp;
77typedef struct Enc Enc;
Ben Lindstrom2d90e002001-04-04 02:00:54 +000078typedef struct Newkeys Newkeys;
Damien Miller33b13562000-04-04 14:38:59 +100079
80struct Enc {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000081 char *name;
82 Cipher *cipher;
83 int enabled;
Damien Miller963f6b22002-02-19 15:21:23 +110084 u_int key_len;
85 u_int block_size;
Ben Lindstrom46c16222000-12-22 01:43:59 +000086 u_char *key;
87 u_char *iv;
Damien Miller33b13562000-04-04 14:38:59 +100088};
89struct Mac {
Ben Lindstrom2d90e002001-04-04 02:00:54 +000090 char *name;
91 int enabled;
Damien Millereccb9de2005-06-17 12:59:34 +100092 u_int mac_len;
Ben Lindstrom46c16222000-12-22 01:43:59 +000093 u_char *key;
Damien Millereccb9de2005-06-17 12:59:34 +100094 u_int key_len;
Damien Millere45796f2007-06-11 14:01:42 +100095 int type;
96 const EVP_MD *evp_md;
97 HMAC_CTX evp_ctx;
98 struct umac_ctx *umac_ctx;
Damien Miller33b13562000-04-04 14:38:59 +100099};
100struct Comp {
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000101 int type;
102 int enabled;
103 char *name;
Damien Miller33b13562000-04-04 14:38:59 +1000104};
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000105struct Newkeys {
106 Enc enc;
107 Mac mac;
108 Comp comp;
109};
Damien Miller33b13562000-04-04 14:38:59 +1000110struct Kex {
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000111 u_char *session_id;
Damien Millera10f5612002-09-12 09:49:15 +1000112 u_int session_id_len;
Ben Lindstrombe2cc432001-04-04 23:46:07 +0000113 Newkeys *newkeys[MODE_MAX];
Damien Millereccb9de2005-06-17 12:59:34 +1000114 u_int we_need;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000115 int server;
116 char *name;
117 int hostkey_type;
118 int kex_type;
119 Buffer my;
120 Buffer peer;
Damien Miller97c91f62006-04-23 12:08:37 +1000121 sig_atomic_t done;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000122 int flags;
Damien Miller19bb3a52005-11-05 15:19:35 +1100123 const EVP_MD *evp_md;
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000124 char *client_version_string;
125 char *server_version_string;
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000126 int (*verify_host_key)(Key *);
127 Key *(*load_host_key)(int);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000128 int (*host_key_index)(Key *);
Damien Miller8e7fb332003-02-24 12:03:03 +1100129 void (*kex[KEX_MAX])(Kex *);
Damien Miller33b13562000-04-04 14:38:59 +1000130};
131
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000132Kex *kex_setup(char *[PROPOSAL_MAX]);
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000133void kex_finish(Kex *);
Ben Lindstrom238abf62001-04-04 17:52:53 +0000134
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000135void kex_send_kexinit(Kex *);
Damien Miller630d6f42002-01-22 23:17:30 +1100136void kex_input_kexinit(int, u_int32_t, void *);
Damien Miller19bb3a52005-11-05 15:19:35 +1100137void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
Damien Miller33b13562000-04-04 14:38:59 +1000138
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000139Newkeys *kex_get_newkeys(int);
Ben Lindstrom2d90e002001-04-04 02:00:54 +0000140
Damien Miller8e7fb332003-02-24 12:03:03 +1100141void kexdh_client(Kex *);
142void kexdh_server(Kex *);
143void kexgex_client(Kex *);
144void kexgex_server(Kex *);
145
Damien Miller19bb3a52005-11-05 15:19:35 +1100146void
Damien Miller8e7fb332003-02-24 12:03:03 +1100147kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
Damien Miller19bb3a52005-11-05 15:19:35 +1100148 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
149void
150kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
Damien Miller51b4f822006-03-26 00:04:32 +1100151 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
Damien Miller19bb3a52005-11-05 15:19:35 +1100152 BIGNUM *, BIGNUM *, u_char **, u_int *);
Damien Miller8e7fb332003-02-24 12:03:03 +1100153
Darren Tuckere4ab1152004-05-24 10:14:24 +1000154void
155derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
156
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000157#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000158void dump_digest(char *, u_char *, int);
Ben Lindstrom20d7c7b2001-04-04 01:56:17 +0000159#endif
160
Damien Miller33b13562000-04-04 14:38:59 +1000161#endif