1 /* $NetBSD: kex.h,v 1.7 2013/11/08 19:18:25 christos Exp $ */ 2 /* $OpenBSD: kex.h,v 1.56 2013/07/19 07:37:48 markus 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 #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256" 42 #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384" 43 #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521" 44 45 #define COMP_NONE 0 46 #define COMP_ZLIB 1 47 #define COMP_DELAYED 2 48 49 enum kex_init_proposals { 50 PROPOSAL_KEX_ALGS, 51 PROPOSAL_SERVER_HOST_KEY_ALGS, 52 PROPOSAL_ENC_ALGS_CTOS, 53 PROPOSAL_ENC_ALGS_STOC, 54 PROPOSAL_MAC_ALGS_CTOS, 55 PROPOSAL_MAC_ALGS_STOC, 56 PROPOSAL_COMP_ALGS_CTOS, 57 PROPOSAL_COMP_ALGS_STOC, 58 PROPOSAL_LANG_CTOS, 59 PROPOSAL_LANG_STOC, 60 PROPOSAL_MAX 61 }; 62 63 enum kex_modes { 64 MODE_IN, 65 MODE_OUT, 66 MODE_MAX 67 }; 68 69 enum kex_exchange { 70 KEX_DH_GRP1_SHA1, 71 KEX_DH_GRP14_SHA1, 72 KEX_DH_GEX_SHA1, 73 KEX_DH_GEX_SHA256, 74 KEX_ECDH_SHA2, 75 KEX_MAX 76 }; 77 78 #define KEX_INIT_SENT 0x0001 79 80 typedef struct Kex Kex; 81 typedef struct Mac Mac; 82 typedef struct Comp Comp; 83 typedef struct Enc Enc; 84 typedef struct Newkeys Newkeys; 85 86 struct Enc { 87 char *name; 88 const Cipher *cipher; 89 int enabled; 90 u_int key_len; 91 u_int iv_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 int etm; /* Encrypt-then-MAC */ 104 const EVP_MD *evp_md; 105 HMAC_CTX evp_ctx; 106 struct umac_ctx *umac_ctx; 107 }; 108 struct Comp { 109 int type; 110 int enabled; 111 char *name; 112 }; 113 struct Newkeys { 114 Enc enc; 115 Mac mac; 116 Comp comp; 117 }; 118 struct Kex { 119 u_char *session_id; 120 u_int session_id_len; 121 Newkeys *newkeys[MODE_MAX]; 122 u_int we_need; 123 int server; 124 char *name; 125 int hostkey_type; 126 int kex_type; 127 int roaming; 128 Buffer my; 129 Buffer peer; 130 sig_atomic_t done; 131 int flags; 132 const EVP_MD *evp_md; 133 int ec_nid; 134 char *client_version_string; 135 char *server_version_string; 136 int (*verify_host_key)(Key *); 137 Key *(*load_host_public_key)(int); 138 Key *(*load_host_private_key)(int); 139 int (*host_key_index)(Key *); 140 void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int); 141 void (*kex[KEX_MAX])(Kex *); 142 }; 143 144 void kex_prop2buf(Buffer *, const char *proposal[PROPOSAL_MAX]); 145 146 int kex_names_valid(const char *); 147 char *kex_alg_list(void); 148 149 Kex *kex_setup(const char *[PROPOSAL_MAX]); 150 void kex_finish(Kex *); 151 152 void kex_send_kexinit(Kex *); 153 void kex_input_kexinit(int, u_int32_t, void *); 154 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 155 156 Newkeys *kex_get_newkeys(int); 157 158 void kexdh_client(Kex *); 159 void kexdh_server(Kex *); 160 void kexgex_client(Kex *); 161 void kexgex_server(Kex *); 162 void kexecdh_client(Kex *); 163 void kexecdh_server(Kex *); 164 165 void 166 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 167 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 168 void 169 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 170 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 171 BIGNUM *, BIGNUM *, u_char **, u_int *); 172 void 173 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, 174 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, 175 const BIGNUM *, u_char **, u_int *); 176 177 void 178 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 179 180 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) 181 void dump_digest(char *, u_char *, int); 182 #endif 183 184 #endif 185