1 /* $OpenBSD: kex.h,v 1.56 2013/07/19 07:37:48 markus Exp $ */ 2 /* $FreeBSD$ */ 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 <signal.h> 31 #include <openssl/evp.h> 32 #include <openssl/hmac.h> 33 #ifdef OPENSSL_HAS_ECC 34 #include <openssl/ec.h> 35 #endif 36 37 #define KEX_COOKIE_LEN 16 38 39 #define KEX_DH1 "diffie-hellman-group1-sha1" 40 #define KEX_DH14 "diffie-hellman-group14-sha1" 41 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" 42 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" 43 #define KEX_RESUME "resume@appgate.com" 44 #define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256" 45 #define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384" 46 #define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521" 47 48 #define COMP_NONE 0 49 #define COMP_ZLIB 1 50 #define COMP_DELAYED 2 51 52 enum kex_init_proposals { 53 PROPOSAL_KEX_ALGS, 54 PROPOSAL_SERVER_HOST_KEY_ALGS, 55 PROPOSAL_ENC_ALGS_CTOS, 56 PROPOSAL_ENC_ALGS_STOC, 57 PROPOSAL_MAC_ALGS_CTOS, 58 PROPOSAL_MAC_ALGS_STOC, 59 PROPOSAL_COMP_ALGS_CTOS, 60 PROPOSAL_COMP_ALGS_STOC, 61 PROPOSAL_LANG_CTOS, 62 PROPOSAL_LANG_STOC, 63 PROPOSAL_MAX 64 }; 65 66 enum kex_modes { 67 MODE_IN, 68 MODE_OUT, 69 MODE_MAX 70 }; 71 72 enum kex_exchange { 73 KEX_DH_GRP1_SHA1, 74 KEX_DH_GRP14_SHA1, 75 KEX_DH_GEX_SHA1, 76 KEX_DH_GEX_SHA256, 77 KEX_ECDH_SHA2, 78 KEX_MAX 79 }; 80 81 #define KEX_INIT_SENT 0x0001 82 83 typedef struct Kex Kex; 84 typedef struct Mac Mac; 85 typedef struct Comp Comp; 86 typedef struct Enc Enc; 87 typedef struct Newkeys Newkeys; 88 89 struct Enc { 90 char *name; 91 const Cipher *cipher; 92 int enabled; 93 u_int key_len; 94 u_int iv_len; 95 u_int block_size; 96 u_char *key; 97 u_char *iv; 98 }; 99 struct Mac { 100 char *name; 101 int enabled; 102 u_int mac_len; 103 u_char *key; 104 u_int key_len; 105 int type; 106 int etm; /* Encrypt-then-MAC */ 107 const EVP_MD *evp_md; 108 HMAC_CTX evp_ctx; 109 struct umac_ctx *umac_ctx; 110 }; 111 struct Comp { 112 int type; 113 int enabled; 114 char *name; 115 }; 116 struct Newkeys { 117 Enc enc; 118 Mac mac; 119 Comp comp; 120 }; 121 struct Kex { 122 u_char *session_id; 123 u_int session_id_len; 124 Newkeys *newkeys[MODE_MAX]; 125 u_int we_need; 126 int server; 127 char *name; 128 int hostkey_type; 129 int kex_type; 130 int roaming; 131 Buffer my; 132 Buffer peer; 133 sig_atomic_t done; 134 int flags; 135 const EVP_MD *evp_md; 136 int ec_nid; 137 char *client_version_string; 138 char *server_version_string; 139 int (*verify_host_key)(Key *); 140 Key *(*load_host_public_key)(int); 141 Key *(*load_host_private_key)(int); 142 int (*host_key_index)(Key *); 143 void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int); 144 void (*kex[KEX_MAX])(Kex *); 145 }; 146 147 int kex_names_valid(const char *); 148 char *kex_alg_list(void); 149 150 #ifdef NONE_CIPHER_ENABLED 151 void kex_prop2buf(Buffer *, char *[PROPOSAL_MAX]); 152 #endif 153 154 Kex *kex_setup(char *[PROPOSAL_MAX]); 155 void kex_finish(Kex *); 156 157 void kex_send_kexinit(Kex *); 158 void kex_input_kexinit(int, u_int32_t, void *); 159 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 160 161 Newkeys *kex_get_newkeys(int); 162 163 void kexdh_client(Kex *); 164 void kexdh_server(Kex *); 165 void kexgex_client(Kex *); 166 void kexgex_server(Kex *); 167 void kexecdh_client(Kex *); 168 void kexecdh_server(Kex *); 169 170 void 171 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 172 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 173 void 174 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 175 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 176 BIGNUM *, BIGNUM *, u_char **, u_int *); 177 #ifdef OPENSSL_HAS_ECC 178 void 179 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, 180 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, 181 const BIGNUM *, u_char **, u_int *); 182 #endif 183 184 void 185 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 186 187 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) 188 void dump_digest(char *, u_char *, int); 189 #endif 190 191 #endif 192