1 /* $OpenBSD: kex.h,v 1.44 2006/08/03 03:34:42 deraadt 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 <signal.h> 30 #include <openssl/evp.h> 31 32 #define KEX_DH1 "diffie-hellman-group1-sha1" 33 #define KEX_DH14 "diffie-hellman-group14-sha1" 34 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" 35 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" 36 37 #define COMP_NONE 0 38 #define COMP_ZLIB 1 39 #define COMP_DELAYED 2 40 41 enum kex_init_proposals { 42 PROPOSAL_KEX_ALGS, 43 PROPOSAL_SERVER_HOST_KEY_ALGS, 44 PROPOSAL_ENC_ALGS_CTOS, 45 PROPOSAL_ENC_ALGS_STOC, 46 PROPOSAL_MAC_ALGS_CTOS, 47 PROPOSAL_MAC_ALGS_STOC, 48 PROPOSAL_COMP_ALGS_CTOS, 49 PROPOSAL_COMP_ALGS_STOC, 50 PROPOSAL_LANG_CTOS, 51 PROPOSAL_LANG_STOC, 52 PROPOSAL_MAX 53 }; 54 55 enum kex_modes { 56 MODE_IN, 57 MODE_OUT, 58 MODE_MAX 59 }; 60 61 enum kex_exchange { 62 KEX_DH_GRP1_SHA1, 63 KEX_DH_GRP14_SHA1, 64 KEX_DH_GEX_SHA1, 65 KEX_DH_GEX_SHA256, 66 KEX_MAX 67 }; 68 69 #define KEX_INIT_SENT 0x0001 70 71 typedef struct Kex Kex; 72 typedef struct Mac Mac; 73 typedef struct Comp Comp; 74 typedef struct Enc Enc; 75 typedef struct Newkeys Newkeys; 76 77 struct Enc { 78 char *name; 79 Cipher *cipher; 80 int enabled; 81 u_int key_len; 82 u_int block_size; 83 u_char *key; 84 u_char *iv; 85 }; 86 struct Mac { 87 char *name; 88 int enabled; 89 const EVP_MD *md; 90 u_int mac_len; 91 u_char *key; 92 u_int key_len; 93 }; 94 struct Comp { 95 int type; 96 int enabled; 97 char *name; 98 }; 99 struct Newkeys { 100 Enc enc; 101 Mac mac; 102 Comp comp; 103 }; 104 struct Kex { 105 u_char *session_id; 106 u_int session_id_len; 107 Newkeys *newkeys[MODE_MAX]; 108 u_int we_need; 109 int server; 110 char *name; 111 int hostkey_type; 112 int kex_type; 113 Buffer my; 114 Buffer peer; 115 sig_atomic_t done; 116 int flags; 117 const EVP_MD *evp_md; 118 char *client_version_string; 119 char *server_version_string; 120 int (*verify_host_key)(Key *); 121 Key *(*load_host_key)(int); 122 int (*host_key_index)(Key *); 123 void (*kex[KEX_MAX])(Kex *); 124 }; 125 126 Kex *kex_setup(char *[PROPOSAL_MAX]); 127 void kex_finish(Kex *); 128 129 void kex_send_kexinit(Kex *); 130 void kex_input_kexinit(int, u_int32_t, void *); 131 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 132 133 Newkeys *kex_get_newkeys(int); 134 135 void kexdh_client(Kex *); 136 void kexdh_server(Kex *); 137 void kexgex_client(Kex *); 138 void kexgex_server(Kex *); 139 140 void 141 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 142 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 143 void 144 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 145 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 146 BIGNUM *, BIGNUM *, u_char **, u_int *); 147 148 void 149 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 150 151 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 152 void dump_digest(char *, u_char *, int); 153 #endif 154 155 #endif 156