Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 1 | /* $OpenBSD: kex.h,v 1.19 2001/04/03 23:32:12 markus Exp $ */ |
Ben Lindstrom | 36579d3 | 2001-01-29 07:39:26 +0000 | [diff] [blame] | 2 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 3 | /* |
| 4 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 5 | * |
| 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 Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 14 | * |
| 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 Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 29 | #include <openssl/evp.h> |
| 30 | #include "buffer.h" |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 31 | #include "cipher.h" |
| 32 | #include "key.h" |
Ben Lindstrom | 06b33aa | 2001-02-15 03:01:59 +0000 | [diff] [blame] | 33 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 34 | #define KEX_DH1 "diffie-hellman-group1-sha1" |
| 35 | #define KEX_DHGEX "diffie-hellman-group-exchange-sha1" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 36 | |
| 37 | enum kex_init_proposals { |
| 38 | PROPOSAL_KEX_ALGS, |
| 39 | PROPOSAL_SERVER_HOST_KEY_ALGS, |
| 40 | PROPOSAL_ENC_ALGS_CTOS, |
| 41 | PROPOSAL_ENC_ALGS_STOC, |
| 42 | PROPOSAL_MAC_ALGS_CTOS, |
| 43 | PROPOSAL_MAC_ALGS_STOC, |
| 44 | PROPOSAL_COMP_ALGS_CTOS, |
| 45 | PROPOSAL_COMP_ALGS_STOC, |
| 46 | PROPOSAL_LANG_CTOS, |
| 47 | PROPOSAL_LANG_STOC, |
| 48 | PROPOSAL_MAX |
| 49 | }; |
| 50 | |
| 51 | enum kex_modes { |
| 52 | MODE_IN, |
| 53 | MODE_OUT, |
| 54 | MODE_MAX |
| 55 | }; |
| 56 | |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 57 | enum kex_exchange { |
| 58 | DH_GRP1_SHA1, |
| 59 | DH_GEX_SHA1 |
| 60 | }; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 61 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 62 | #define KEX_INIT_SENT 0x0001 |
| 63 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 64 | typedef struct Kex Kex; |
| 65 | typedef struct Mac Mac; |
| 66 | typedef struct Comp Comp; |
| 67 | typedef struct Enc Enc; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 68 | typedef struct Newkeys Newkeys; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 69 | |
| 70 | struct Enc { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 71 | char *name; |
| 72 | Cipher *cipher; |
| 73 | int enabled; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 74 | u_char *key; |
| 75 | u_char *iv; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 76 | }; |
| 77 | struct Mac { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 78 | char *name; |
| 79 | int enabled; |
| 80 | EVP_MD *md; |
| 81 | int mac_len; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 82 | u_char *key; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 83 | int key_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 84 | }; |
| 85 | struct Comp { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 86 | int type; |
| 87 | int enabled; |
| 88 | char *name; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 89 | }; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 90 | struct Newkeys { |
| 91 | Enc enc; |
| 92 | Mac mac; |
| 93 | Comp comp; |
| 94 | }; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 95 | struct Kex { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 96 | u_char *session_id; |
| 97 | int session_id_len; |
| 98 | Newkeys *keys[MODE_MAX]; |
| 99 | int we_need; |
| 100 | int server; |
| 101 | char *name; |
| 102 | int hostkey_type; |
| 103 | int kex_type; |
| 104 | Buffer my; |
| 105 | Buffer peer; |
| 106 | int newkeys; |
| 107 | int flags; |
| 108 | char *client_version_string; |
| 109 | char *server_version_string; |
| 110 | int (*check_host_key)(Key *hostkey); |
| 111 | Key *(*load_host_key)(int type); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 112 | }; |
| 113 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 114 | Kex *kex_start(char *proposal[PROPOSAL_MAX]); |
| 115 | void kex_send_newkeys(void); |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 116 | void kex_send_kexinit(Kex *kex); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 117 | void kex_protocol_error(int type, int plen, void *ctxt); |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 118 | void kex_derive_keys(Kex *k, u_char *hash, BIGNUM *shared_secret); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 119 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 120 | void kexdh(Kex *); |
| 121 | void kexgex(Kex *); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 122 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 123 | Newkeys *kex_get_newkeys(int mode); |
| 124 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 125 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) |
| 126 | void dump_digest(char *msg, u_char *digest, int len); |
| 127 | #endif |
| 128 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 129 | #endif |