1 /* $OpenBSD: kex.h,v 1.35 2004/06/13 12:53:24 djm 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 "buffer.h" 31 #include "cipher.h" 32 #include "key.h" 33 34 #define KEX_DH1 "diffie-hellman-group1-sha1" 35 #define KEX_DH14 "diffie-hellman-group14-sha1" 36 #define KEX_DHGEX "diffie-hellman-group-exchange-sha1" 37 38 enum kex_init_proposals { 39 PROPOSAL_KEX_ALGS, 40 PROPOSAL_SERVER_HOST_KEY_ALGS, 41 PROPOSAL_ENC_ALGS_CTOS, 42 PROPOSAL_ENC_ALGS_STOC, 43 PROPOSAL_MAC_ALGS_CTOS, 44 PROPOSAL_MAC_ALGS_STOC, 45 PROPOSAL_COMP_ALGS_CTOS, 46 PROPOSAL_COMP_ALGS_STOC, 47 PROPOSAL_LANG_CTOS, 48 PROPOSAL_LANG_STOC, 49 PROPOSAL_MAX 50 }; 51 52 enum kex_modes { 53 MODE_IN, 54 MODE_OUT, 55 MODE_MAX 56 }; 57 58 enum kex_exchange { 59 KEX_DH_GRP1_SHA1, 60 KEX_DH_GRP14_SHA1, 61 KEX_DH_GEX_SHA1, 62 KEX_MAX 63 }; 64 65 #define KEX_INIT_SENT 0x0001 66 67 typedef struct Kex Kex; 68 typedef struct Mac Mac; 69 typedef struct Comp Comp; 70 typedef struct Enc Enc; 71 typedef struct Newkeys Newkeys; 72 73 struct Enc { 74 char *name; 75 Cipher *cipher; 76 int enabled; 77 u_int key_len; 78 u_int block_size; 79 u_char *key; 80 u_char *iv; 81 }; 82 struct Mac { 83 char *name; 84 int enabled; 85 const EVP_MD *md; 86 int mac_len; 87 u_char *key; 88 int key_len; 89 }; 90 struct Comp { 91 int type; 92 int enabled; 93 char *name; 94 }; 95 struct Newkeys { 96 Enc enc; 97 Mac mac; 98 Comp comp; 99 }; 100 struct Kex { 101 u_char *session_id; 102 u_int session_id_len; 103 Newkeys *newkeys[MODE_MAX]; 104 int we_need; 105 int server; 106 char *name; 107 int hostkey_type; 108 int kex_type; 109 Buffer my; 110 Buffer peer; 111 int done; 112 int flags; 113 char *client_version_string; 114 char *server_version_string; 115 int (*verify_host_key)(Key *); 116 Key *(*load_host_key)(int); 117 int (*host_key_index)(Key *); 118 void (*kex[KEX_MAX])(Kex *); 119 }; 120 121 Kex *kex_setup(char *[PROPOSAL_MAX]); 122 void kex_finish(Kex *); 123 124 void kex_send_kexinit(Kex *); 125 void kex_input_kexinit(int, u_int32_t, void *); 126 void kex_derive_keys(Kex *, u_char *, BIGNUM *); 127 128 Newkeys *kex_get_newkeys(int); 129 130 void kexdh_client(Kex *); 131 void kexdh_server(Kex *); 132 void kexgex_client(Kex *); 133 void kexgex_server(Kex *); 134 135 u_char * 136 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 137 BIGNUM *, BIGNUM *, BIGNUM *); 138 u_char * 139 kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int, 140 int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *); 141 142 void 143 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 144 145 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 146 void dump_digest(char *, u_char *, int); 147 #endif 148 149 #endif 150