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 void kex_prop2buf(Buffer *, char *proposal[PROPOSAL_MAX]); 144 145 Kex *kex_setup(char *[PROPOSAL_MAX]); 146 void kex_finish(Kex *); 147 148 void kex_send_kexinit(Kex *); 149 void kex_input_kexinit(int, u_int32_t, void *); 150 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 151 152 Newkeys *kex_get_newkeys(int); 153 154 void kexdh_client(Kex *); 155 void kexdh_server(Kex *); 156 void kexgex_client(Kex *); 157 void kexgex_server(Kex *); 158 void kexecdh_client(Kex *); 159 void kexecdh_server(Kex *); 160 161 void 162 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 163 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 164 void 165 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 166 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 167 BIGNUM *, BIGNUM *, u_char **, u_int *); 168 #ifdef OPENSSL_HAS_ECC 169 void 170 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, 171 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, 172 const BIGNUM *, u_char **, u_int *); 173 int kex_ecdh_name_to_nid(const char *); 174 const EVP_MD *kex_ecdh_name_to_evpmd(const char *); 175 #else 176 # define kex_ecdh_name_to_nid(x) (-1) 177 # define kex_ecdh_name_to_evpmd(x) (NULL) 178 #endif 179 180 void 181 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 182 183 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) 184 void dump_digest(char *, u_char *, int); 185 #endif 186 187 #endif 188