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