Mike Lockwood | 1305e95 | 2011-12-07 08:17:59 -0800 | [diff] [blame] | 1 | /* $OpenBSD: kex.h,v 1.52 2010/09/22 05:01:29 djm Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2000, 2001 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. |
| 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 | |
| 29 | #include <signal.h> |
| 30 | #include <openssl/evp.h> |
| 31 | #include <openssl/hmac.h> |
| 32 | #ifdef OPENSSL_HAS_ECC |
| 33 | #include <openssl/ec.h> |
| 34 | #endif |
| 35 | |
| 36 | #define KEX_COOKIE_LEN 16 |
| 37 | |
| 38 | #define KEX_DH1 "diffie-hellman-group1-sha1" |
| 39 | #define KEX_DH14 "diffie-hellman-group14-sha1" |
| 40 | #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" |
| 41 | #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" |
| 42 | #define KEX_RESUME "resume@appgate.com" |
| 43 | /* The following represents the family of ECDH methods */ |
| 44 | #define KEX_ECDH_SHA2_STEM "ecdh-sha2-" |
| 45 | |
| 46 | #define COMP_NONE 0 |
| 47 | #define COMP_ZLIB 1 |
| 48 | #define COMP_DELAYED 2 |
| 49 | |
| 50 | enum kex_init_proposals { |
| 51 | PROPOSAL_KEX_ALGS, |
| 52 | PROPOSAL_SERVER_HOST_KEY_ALGS, |
| 53 | PROPOSAL_ENC_ALGS_CTOS, |
| 54 | PROPOSAL_ENC_ALGS_STOC, |
| 55 | PROPOSAL_MAC_ALGS_CTOS, |
| 56 | PROPOSAL_MAC_ALGS_STOC, |
| 57 | PROPOSAL_COMP_ALGS_CTOS, |
| 58 | PROPOSAL_COMP_ALGS_STOC, |
| 59 | PROPOSAL_LANG_CTOS, |
| 60 | PROPOSAL_LANG_STOC, |
| 61 | PROPOSAL_MAX |
| 62 | }; |
| 63 | |
| 64 | enum kex_modes { |
| 65 | MODE_IN, |
| 66 | MODE_OUT, |
| 67 | MODE_MAX |
| 68 | }; |
| 69 | |
| 70 | enum kex_exchange { |
| 71 | KEX_DH_GRP1_SHA1, |
| 72 | KEX_DH_GRP14_SHA1, |
| 73 | KEX_DH_GEX_SHA1, |
| 74 | KEX_DH_GEX_SHA256, |
| 75 | KEX_ECDH_SHA2, |
| 76 | KEX_MAX |
| 77 | }; |
| 78 | |
| 79 | #define KEX_INIT_SENT 0x0001 |
| 80 | |
| 81 | typedef struct Kex Kex; |
| 82 | typedef struct Mac Mac; |
| 83 | typedef struct Comp Comp; |
| 84 | typedef struct Enc Enc; |
| 85 | typedef struct Newkeys Newkeys; |
| 86 | |
| 87 | struct Enc { |
| 88 | char *name; |
| 89 | Cipher *cipher; |
| 90 | int enabled; |
| 91 | u_int key_len; |
| 92 | u_int block_size; |
| 93 | u_char *key; |
| 94 | u_char *iv; |
| 95 | }; |
| 96 | struct Mac { |
| 97 | char *name; |
| 98 | int enabled; |
| 99 | u_int mac_len; |
| 100 | u_char *key; |
| 101 | u_int key_len; |
| 102 | int type; |
| 103 | const EVP_MD *evp_md; |
| 104 | HMAC_CTX evp_ctx; |
| 105 | struct umac_ctx *umac_ctx; |
| 106 | }; |
| 107 | struct Comp { |
| 108 | int type; |
| 109 | int enabled; |
| 110 | char *name; |
| 111 | }; |
| 112 | struct Newkeys { |
| 113 | Enc enc; |
| 114 | Mac mac; |
| 115 | Comp comp; |
| 116 | }; |
| 117 | struct Kex { |
| 118 | u_char *session_id; |
| 119 | u_int session_id_len; |
| 120 | Newkeys *newkeys[MODE_MAX]; |
| 121 | u_int we_need; |
| 122 | int server; |
| 123 | char *name; |
| 124 | int hostkey_type; |
| 125 | int kex_type; |
| 126 | int roaming; |
| 127 | Buffer my; |
| 128 | Buffer peer; |
| 129 | sig_atomic_t done; |
| 130 | int flags; |
| 131 | const EVP_MD *evp_md; |
| 132 | char *client_version_string; |
| 133 | char *server_version_string; |
| 134 | int (*verify_host_key)(Key *); |
| 135 | Key *(*load_host_public_key)(int); |
| 136 | Key *(*load_host_private_key)(int); |
| 137 | int (*host_key_index)(Key *); |
| 138 | void (*kex[KEX_MAX])(Kex *); |
| 139 | }; |
| 140 | |
| 141 | int kex_names_valid(const char *); |
| 142 | |
| 143 | Kex *kex_setup(char *[PROPOSAL_MAX]); |
| 144 | void kex_finish(Kex *); |
| 145 | |
| 146 | void kex_send_kexinit(Kex *); |
| 147 | void kex_input_kexinit(int, u_int32_t, void *); |
| 148 | void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); |
| 149 | |
| 150 | Newkeys *kex_get_newkeys(int); |
| 151 | |
| 152 | void kexdh_client(Kex *); |
| 153 | void kexdh_server(Kex *); |
| 154 | void kexgex_client(Kex *); |
| 155 | void kexgex_server(Kex *); |
| 156 | void kexecdh_client(Kex *); |
| 157 | void kexecdh_server(Kex *); |
| 158 | |
| 159 | void |
| 160 | kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, |
| 161 | BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); |
| 162 | void |
| 163 | kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, |
| 164 | int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, |
| 165 | BIGNUM *, BIGNUM *, u_char **, u_int *); |
| 166 | #ifdef OPENSSL_HAS_ECC |
| 167 | void |
| 168 | kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, |
| 169 | char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, |
| 170 | const BIGNUM *, u_char **, u_int *); |
| 171 | int kex_ecdh_name_to_nid(const char *); |
| 172 | const EVP_MD *kex_ecdh_name_to_evpmd(const char *); |
| 173 | #else |
| 174 | # define kex_ecdh_name_to_nid(x) (-1) |
| 175 | # define kex_ecdh_name_to_evpmd(x) (NULL) |
| 176 | #endif |
| 177 | |
| 178 | void |
| 179 | derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); |
| 180 | |
| 181 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) |
| 182 | void dump_digest(char *, u_char *, int); |
| 183 | #endif |
| 184 | |
| 185 | #endif |