1 /* $NetBSD: kex.h,v 1.5 2011/07/25 03:03:10 christos Exp $ */ 2 /* $OpenBSD: kex.h,v 1.52 2010/09/22 05:01:29 djm Exp $ */ 3 4 /* 5 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #ifndef KEX_H 28 #define KEX_H 29 30 #include <openssl/evp.h> 31 #include <openssl/hmac.h> 32 #include <openssl/ec.h> 33 34 #define KEX_COOKIE_LEN 16 35 36 #define KEX_DH1 "diffie-hellman-group1-sha1" 37 #define KEX_DH14 "diffie-hellman-group14-sha1" 38 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" 39 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" 40 #define KEX_RESUME "resume@appgate.com" 41 /* The following represents the family of ECDH methods */ 42 #define KEX_ECDH_SHA2_STEM "ecdh-sha2-" 43 44 #define COMP_NONE 0 45 #define COMP_ZLIB 1 46 #define COMP_DELAYED 2 47 48 enum kex_init_proposals { 49 PROPOSAL_KEX_ALGS, 50 PROPOSAL_SERVER_HOST_KEY_ALGS, 51 PROPOSAL_ENC_ALGS_CTOS, 52 PROPOSAL_ENC_ALGS_STOC, 53 PROPOSAL_MAC_ALGS_CTOS, 54 PROPOSAL_MAC_ALGS_STOC, 55 PROPOSAL_COMP_ALGS_CTOS, 56 PROPOSAL_COMP_ALGS_STOC, 57 PROPOSAL_LANG_CTOS, 58 PROPOSAL_LANG_STOC, 59 PROPOSAL_MAX 60 }; 61 62 enum kex_modes { 63 MODE_IN, 64 MODE_OUT, 65 MODE_MAX 66 }; 67 68 enum kex_exchange { 69 KEX_DH_GRP1_SHA1, 70 KEX_DH_GRP14_SHA1, 71 KEX_DH_GEX_SHA1, 72 KEX_DH_GEX_SHA256, 73 KEX_ECDH_SHA2, 74 KEX_MAX 75 }; 76 77 #define KEX_INIT_SENT 0x0001 78 79 typedef struct Kex Kex; 80 typedef struct Mac Mac; 81 typedef struct Comp Comp; 82 typedef struct Enc Enc; 83 typedef struct Newkeys Newkeys; 84 85 struct Enc { 86 char *name; 87 Cipher *cipher; 88 int enabled; 89 u_int key_len; 90 u_int block_size; 91 u_char *key; 92 u_char *iv; 93 }; 94 struct Mac { 95 char *name; 96 int enabled; 97 u_int mac_len; 98 u_char *key; 99 u_int key_len; 100 int type; 101 const EVP_MD *evp_md; 102 HMAC_CTX evp_ctx; 103 struct umac_ctx *umac_ctx; 104 }; 105 struct Comp { 106 int type; 107 int enabled; 108 char *name; 109 }; 110 struct Newkeys { 111 Enc enc; 112 Mac mac; 113 Comp comp; 114 }; 115 struct Kex { 116 u_char *session_id; 117 u_int session_id_len; 118 Newkeys *newkeys[MODE_MAX]; 119 u_int we_need; 120 int server; 121 char *name; 122 int hostkey_type; 123 int kex_type; 124 int roaming; 125 Buffer my; 126 Buffer peer; 127 sig_atomic_t done; 128 int flags; 129 const EVP_MD *evp_md; 130 char *client_version_string; 131 char *server_version_string; 132 int (*verify_host_key)(Key *); 133 Key *(*load_host_public_key)(int); 134 Key *(*load_host_private_key)(int); 135 int (*host_key_index)(Key *); 136 void (*kex[KEX_MAX])(Kex *); 137 }; 138 139 void kex_prop2buf(Buffer *, const char *proposal[PROPOSAL_MAX]); 140 141 int kex_names_valid(const char *); 142 143 Kex *kex_setup(const 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 void 167 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, 168 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, 169 const BIGNUM *, u_char **, u_int *); 170 171 int kex_ecdh_name_to_nid(const char *); 172 const EVP_MD *kex_ecdh_name_to_evpmd(const char *); 173 174 void 175 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 176 177 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) 178 void dump_digest(char *, u_char *, int); 179 #endif 180 181 #endif 182