Darren Tucker | e4ab115 | 2004-05-24 10:14:24 +1000 | [diff] [blame] | 1 | /* $OpenBSD: kex.h,v 1.34 2004/05/21 08:43:03 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 | /* |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 4 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 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 { |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 58 | KEX_DH_GRP1_SHA1, |
| 59 | KEX_DH_GEX_SHA1, |
| 60 | KEX_MAX |
Damien Miller | 874d77b | 2000-10-14 16:23:11 +1100 | [diff] [blame] | 61 | }; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 62 | |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 63 | #define KEX_INIT_SENT 0x0001 |
| 64 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 65 | typedef struct Kex Kex; |
| 66 | typedef struct Mac Mac; |
| 67 | typedef struct Comp Comp; |
| 68 | typedef struct Enc Enc; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 69 | typedef struct Newkeys Newkeys; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 70 | |
| 71 | struct Enc { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 72 | char *name; |
| 73 | Cipher *cipher; |
| 74 | int enabled; |
Damien Miller | 963f6b2 | 2002-02-19 15:21:23 +1100 | [diff] [blame] | 75 | u_int key_len; |
| 76 | u_int block_size; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 77 | u_char *key; |
| 78 | u_char *iv; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 79 | }; |
| 80 | struct Mac { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 81 | char *name; |
| 82 | int enabled; |
Ben Lindstrom | 6a24641 | 2002-06-06 19:48:16 +0000 | [diff] [blame] | 83 | const EVP_MD *md; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 84 | int mac_len; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 85 | u_char *key; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 86 | int key_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 87 | }; |
| 88 | struct Comp { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 89 | int type; |
| 90 | int enabled; |
| 91 | char *name; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 92 | }; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 93 | struct Newkeys { |
| 94 | Enc enc; |
| 95 | Mac mac; |
| 96 | Comp comp; |
| 97 | }; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 98 | struct Kex { |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 99 | u_char *session_id; |
Damien Miller | a10f561 | 2002-09-12 09:49:15 +1000 | [diff] [blame] | 100 | u_int session_id_len; |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 101 | Newkeys *newkeys[MODE_MAX]; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 102 | int we_need; |
| 103 | int server; |
| 104 | char *name; |
| 105 | int hostkey_type; |
| 106 | int kex_type; |
| 107 | Buffer my; |
| 108 | Buffer peer; |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 109 | int done; |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 110 | int flags; |
| 111 | char *client_version_string; |
| 112 | char *server_version_string; |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 113 | int (*verify_host_key)(Key *); |
| 114 | Key *(*load_host_key)(int); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 115 | int (*host_key_index)(Key *); |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 116 | void (*kex[KEX_MAX])(Kex *); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 117 | }; |
| 118 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 119 | Kex *kex_setup(char *[PROPOSAL_MAX]); |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 120 | void kex_finish(Kex *); |
Ben Lindstrom | 238abf6 | 2001-04-04 17:52:53 +0000 | [diff] [blame] | 121 | |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 122 | void kex_send_kexinit(Kex *); |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 123 | void kex_input_kexinit(int, u_int32_t, void *); |
Ben Lindstrom | 4cc240d | 2001-07-04 04:46:56 +0000 | [diff] [blame] | 124 | void kex_derive_keys(Kex *, u_char *, BIGNUM *); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 125 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 126 | Newkeys *kex_get_newkeys(int); |
Ben Lindstrom | 2d90e00 | 2001-04-04 02:00:54 +0000 | [diff] [blame] | 127 | |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 128 | void kexdh_client(Kex *); |
| 129 | void kexdh_server(Kex *); |
| 130 | void kexgex_client(Kex *); |
| 131 | void kexgex_server(Kex *); |
| 132 | |
| 133 | u_char * |
| 134 | kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, |
| 135 | BIGNUM *, BIGNUM *, BIGNUM *); |
| 136 | u_char * |
| 137 | kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int, |
| 138 | int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *); |
| 139 | |
Darren Tucker | e4ab115 | 2004-05-24 10:14:24 +1000 | [diff] [blame] | 140 | void |
| 141 | derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); |
| 142 | |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 143 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 144 | void dump_digest(char *, u_char *, int); |
Ben Lindstrom | 20d7c7b | 2001-04-04 01:56:17 +0000 | [diff] [blame] | 145 | #endif |
| 146 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 147 | #endif |