1 /* $OpenBSD: kex.h,v 1.47 2009/05/27 06:34:36 andreas 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 <openssl/evp.h> 30 #include <openssl/hmac.h> 31 32 #define KEX_COOKIE_LEN 16 33 34 #define KEX_DH1 "diffie-hellman-group1-sha1" 35 #define KEX_DH14 "diffie-hellman-group14-sha1" 36 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" 37 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" 38 39 #define COMP_NONE 0 40 #define COMP_ZLIB 1 41 #define COMP_DELAYED 2 42 43 enum kex_init_proposals { 44 PROPOSAL_KEX_ALGS, 45 PROPOSAL_SERVER_HOST_KEY_ALGS, 46 PROPOSAL_ENC_ALGS_CTOS, 47 PROPOSAL_ENC_ALGS_STOC, 48 PROPOSAL_MAC_ALGS_CTOS, 49 PROPOSAL_MAC_ALGS_STOC, 50 PROPOSAL_COMP_ALGS_CTOS, 51 PROPOSAL_COMP_ALGS_STOC, 52 PROPOSAL_LANG_CTOS, 53 PROPOSAL_LANG_STOC, 54 PROPOSAL_MAX 55 }; 56 57 enum kex_modes { 58 MODE_IN, 59 MODE_OUT, 60 MODE_MAX 61 }; 62 63 enum kex_exchange { 64 KEX_DH_GRP1_SHA1, 65 KEX_DH_GRP14_SHA1, 66 KEX_DH_GEX_SHA1, 67 KEX_DH_GEX_SHA256, 68 KEX_MAX 69 }; 70 71 #define KEX_INIT_SENT 0x0001 72 73 typedef struct Kex Kex; 74 typedef struct Mac Mac; 75 typedef struct Comp Comp; 76 typedef struct Enc Enc; 77 typedef struct Newkeys Newkeys; 78 79 struct Enc { 80 char *name; 81 Cipher *cipher; 82 int enabled; 83 u_int key_len; 84 u_int block_size; 85 u_char *key; 86 u_char *iv; 87 }; 88 struct Mac { 89 char *name; 90 int enabled; 91 u_int mac_len; 92 u_char *key; 93 u_int key_len; 94 int type; 95 const EVP_MD *evp_md; 96 HMAC_CTX evp_ctx; 97 struct umac_ctx *umac_ctx; 98 }; 99 struct Comp { 100 int type; 101 int enabled; 102 char *name; 103 }; 104 struct Newkeys { 105 Enc enc; 106 Mac mac; 107 Comp comp; 108 }; 109 struct Kex { 110 u_char *session_id; 111 u_int session_id_len; 112 Newkeys *newkeys[MODE_MAX]; 113 u_int we_need; 114 int server; 115 char *name; 116 int hostkey_type; 117 int kex_type; 118 Buffer my; 119 Buffer peer; 120 sig_atomic_t done; 121 int flags; 122 const EVP_MD *evp_md; 123 char *client_version_string; 124 char *server_version_string; 125 int (*verify_host_key)(Key *); 126 Key *(*load_host_key)(int); 127 int (*host_key_index)(Key *); 128 void (*kex[KEX_MAX])(Kex *); 129 }; 130 131 Kex *kex_setup(char *[PROPOSAL_MAX]); 132 void kex_finish(Kex *); 133 134 void kex_send_kexinit(Kex *); 135 void kex_input_kexinit(int, u_int32_t, void *); 136 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 137 138 Newkeys *kex_get_newkeys(int); 139 140 void kexdh_client(Kex *); 141 void kexdh_server(Kex *); 142 void kexgex_client(Kex *); 143 void kexgex_server(Kex *); 144 145 void 146 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 147 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 148 void 149 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 150 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 151 BIGNUM *, BIGNUM *, u_char **, u_int *); 152 153 void 154 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 155 156 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 157 void dump_digest(char *, u_char *, int); 158 #endif 159 160 #endif 161