kex.h revision 255767
1/* $OpenBSD: kex.h,v 1.56 2013/07/19 07:37:48 markus Exp $ */ 2/* $FreeBSD: head/crypto/openssh/kex.h 255767 2013-09-21 21:36:09Z des $ */ 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 52enum 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 66enum kex_modes { 67 MODE_IN, 68 MODE_OUT, 69 MODE_MAX 70}; 71 72enum 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 83typedef struct Kex Kex; 84typedef struct Mac Mac; 85typedef struct Comp Comp; 86typedef struct Enc Enc; 87typedef struct Newkeys Newkeys; 88 89struct 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}; 99struct 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}; 111struct Comp { 112 int type; 113 int enabled; 114 char *name; 115}; 116struct Newkeys { 117 Enc enc; 118 Mac mac; 119 Comp comp; 120}; 121struct 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 147int kex_names_valid(const char *); 148char *kex_alg_list(void); 149 150#ifdef NONE_CIPHER_ENABLED 151void kex_prop2buf(Buffer *, char *[PROPOSAL_MAX]); 152#endif 153 154Kex *kex_setup(char *[PROPOSAL_MAX]); 155void kex_finish(Kex *); 156 157void kex_send_kexinit(Kex *); 158void kex_input_kexinit(int, u_int32_t, void *); 159void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 160 161Newkeys *kex_get_newkeys(int); 162 163void kexdh_client(Kex *); 164void kexdh_server(Kex *); 165void kexgex_client(Kex *); 166void kexgex_server(Kex *); 167void kexecdh_client(Kex *); 168void kexecdh_server(Kex *); 169 170void 171kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 172 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 173void 174kexgex_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 178void 179kex_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 184void 185derive_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) 188void dump_digest(char *, u_char *, int); 189#endif 190 191#endif 192