1 /* $OpenBSD: kex.h,v 1.54 2013/01/08 18:49:04 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 /* The following represents the family of ECDH methods */ 45 #define KEX_ECDH_SHA2_STEM "ecdh-sha2-" 46 47 #define COMP_NONE 0 48 #define COMP_ZLIB 1 49 #define COMP_DELAYED 2 50 51 enum kex_init_proposals { 52 PROPOSAL_KEX_ALGS, 53 PROPOSAL_SERVER_HOST_KEY_ALGS, 54 PROPOSAL_ENC_ALGS_CTOS, 55 PROPOSAL_ENC_ALGS_STOC, 56 PROPOSAL_MAC_ALGS_CTOS, 57 PROPOSAL_MAC_ALGS_STOC, 58 PROPOSAL_COMP_ALGS_CTOS, 59 PROPOSAL_COMP_ALGS_STOC, 60 PROPOSAL_LANG_CTOS, 61 PROPOSAL_LANG_STOC, 62 PROPOSAL_MAX 63 }; 64 65 enum kex_modes { 66 MODE_IN, 67 MODE_OUT, 68 MODE_MAX 69 }; 70 71 enum kex_exchange { 72 KEX_DH_GRP1_SHA1, 73 KEX_DH_GRP14_SHA1, 74 KEX_DH_GEX_SHA1, 75 KEX_DH_GEX_SHA256, 76 KEX_ECDH_SHA2, 77 KEX_MAX 78 }; 79 80 #define KEX_INIT_SENT 0x0001 81 82 typedef struct Kex Kex; 83 typedef struct Mac Mac; 84 typedef struct Comp Comp; 85 typedef struct Enc Enc; 86 typedef struct Newkeys Newkeys; 87 88 struct Enc { 89 char *name; 90 Cipher *cipher; 91 int enabled; 92 u_int key_len; 93 u_int iv_len; 94 u_int block_size; 95 u_char *key; 96 u_char *iv; 97 }; 98 struct Mac { 99 char *name; 100 int enabled; 101 u_int mac_len; 102 u_char *key; 103 u_int key_len; 104 int type; 105 int etm; /* Encrypt-then-MAC */ 106 const EVP_MD *evp_md; 107 HMAC_CTX evp_ctx; 108 struct umac_ctx *umac_ctx; 109 }; 110 struct Comp { 111 int type; 112 int enabled; 113 char *name; 114 }; 115 struct Newkeys { 116 Enc enc; 117 Mac mac; 118 Comp comp; 119 }; 120 struct Kex { 121 u_char *session_id; 122 u_int session_id_len; 123 Newkeys *newkeys[MODE_MAX]; 124 u_int we_need; 125 int server; 126 char *name; 127 int hostkey_type; 128 int kex_type; 129 int roaming; 130 Buffer my; 131 Buffer peer; 132 sig_atomic_t done; 133 int flags; 134 const EVP_MD *evp_md; 135 char *client_version_string; 136 char *server_version_string; 137 int (*verify_host_key)(Key *); 138 Key *(*load_host_public_key)(int); 139 Key *(*load_host_private_key)(int); 140 int (*host_key_index)(Key *); 141 void (*kex[KEX_MAX])(Kex *); 142 }; 143 144 int kex_names_valid(const char *); 145 146 #ifdef NONE_CIPHER_ENABLED 147 void kex_prop2buf(Buffer *, char *[PROPOSAL_MAX]); 148 #endif 149 150 Kex *kex_setup(char *[PROPOSAL_MAX]); 151 void kex_finish(Kex *); 152 153 void kex_send_kexinit(Kex *); 154 void kex_input_kexinit(int, u_int32_t, void *); 155 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 156 157 Newkeys *kex_get_newkeys(int); 158 159 void kexdh_client(Kex *); 160 void kexdh_server(Kex *); 161 void kexgex_client(Kex *); 162 void kexgex_server(Kex *); 163 void kexecdh_client(Kex *); 164 void kexecdh_server(Kex *); 165 166 void 167 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 168 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 169 void 170 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 171 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 172 BIGNUM *, BIGNUM *, u_char **, u_int *); 173 #ifdef OPENSSL_HAS_ECC 174 void 175 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int, 176 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *, 177 const BIGNUM *, u_char **, u_int *); 178 int kex_ecdh_name_to_nid(const char *); 179 const EVP_MD *kex_ecdh_name_to_evpmd(const char *); 180 #else 181 # define kex_ecdh_name_to_nid(x) (-1) 182 # define kex_ecdh_name_to_evpmd(x) (NULL) 183 #endif 184 185 void 186 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 187 188 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH) 189 void dump_digest(char *, u_char *, int); 190 #endif 191 192 #endif 193