1 /* $OpenBSD: kex.h,v 1.46 2007/06/07 19:37:34 pvalchev 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 #include <openssl/hmac.h> 32 33 #define KEX_DH1 "diffie-hellman-group1-sha1" 34 #define KEX_DH14 "diffie-hellman-group14-sha1" 35 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" 36 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" 37 38 #define COMP_NONE 0 39 #define COMP_ZLIB 1 40 #define COMP_DELAYED 2 41 42 enum kex_init_proposals { 43 PROPOSAL_KEX_ALGS, 44 PROPOSAL_SERVER_HOST_KEY_ALGS, 45 PROPOSAL_ENC_ALGS_CTOS, 46 PROPOSAL_ENC_ALGS_STOC, 47 PROPOSAL_MAC_ALGS_CTOS, 48 PROPOSAL_MAC_ALGS_STOC, 49 PROPOSAL_COMP_ALGS_CTOS, 50 PROPOSAL_COMP_ALGS_STOC, 51 PROPOSAL_LANG_CTOS, 52 PROPOSAL_LANG_STOC, 53 PROPOSAL_MAX 54 }; 55 56 enum kex_modes { 57 MODE_IN, 58 MODE_OUT, 59 MODE_MAX 60 }; 61 62 enum kex_exchange { 63 KEX_DH_GRP1_SHA1, 64 KEX_DH_GRP14_SHA1, 65 KEX_DH_GEX_SHA1, 66 KEX_DH_GEX_SHA256, 67 KEX_MAX 68 }; 69 70 #define KEX_INIT_SENT 0x0001 71 72 typedef struct Kex Kex; 73 typedef struct Mac Mac; 74 typedef struct Comp Comp; 75 typedef struct Enc Enc; 76 typedef struct Newkeys Newkeys; 77 78 struct Enc { 79 char *name; 80 Cipher *cipher; 81 int enabled; 82 u_int key_len; 83 u_int block_size; 84 u_char *key; 85 u_char *iv; 86 }; 87 struct Mac { 88 char *name; 89 int enabled; 90 u_int mac_len; 91 u_char *key; 92 u_int key_len; 93 int type; 94 const EVP_MD *evp_md; 95 HMAC_CTX evp_ctx; 96 struct umac_ctx *umac_ctx; 97 }; 98 struct Comp { 99 int type; 100 int enabled; 101 char *name; 102 }; 103 struct Newkeys { 104 Enc enc; 105 Mac mac; 106 Comp comp; 107 }; 108 struct Kex { 109 u_char *session_id; 110 u_int session_id_len; 111 Newkeys *newkeys[MODE_MAX]; 112 u_int we_need; 113 int server; 114 char *name; 115 int hostkey_type; 116 int kex_type; 117 Buffer my; 118 Buffer peer; 119 sig_atomic_t done; 120 int flags; 121 const EVP_MD *evp_md; 122 char *client_version_string; 123 char *server_version_string; 124 int (*verify_host_key)(Key *); 125 Key *(*load_host_key)(int); 126 int (*host_key_index)(Key *); 127 void (*kex[KEX_MAX])(Kex *); 128 }; 129 130 Kex *kex_setup(char *[PROPOSAL_MAX]); 131 void kex_finish(Kex *); 132 133 void kex_send_kexinit(Kex *); 134 void kex_input_kexinit(int, u_int32_t, void *); 135 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 136 137 Newkeys *kex_get_newkeys(int); 138 139 void kexdh_client(Kex *); 140 void kexdh_server(Kex *); 141 void kexgex_client(Kex *); 142 void kexgex_server(Kex *); 143 144 void 145 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 146 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 147 void 148 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 149 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 150 BIGNUM *, BIGNUM *, u_char **, u_int *); 151 152 void 153 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 154 155 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 156 void dump_digest(char *, u_char *, int); 157 #endif 158 159 #endif 160