1 /* $OpenBSD: kex.h,v 1.49 2010/02/26 20:29:54 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 <signal.h> 30 #include <openssl/evp.h> 31 #include <openssl/hmac.h> 32 33 #define KEX_COOKIE_LEN 16 34 35 #define KEX_DH1 "diffie-hellman-group1-sha1" 36 #define KEX_DH14 "diffie-hellman-group14-sha1" 37 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" 38 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" 39 #define KEX_RESUME "resume@appgate.com" 40 41 #define COMP_NONE 0 42 #define COMP_ZLIB 1 43 #define COMP_DELAYED 2 44 45 enum kex_init_proposals { 46 PROPOSAL_KEX_ALGS, 47 PROPOSAL_SERVER_HOST_KEY_ALGS, 48 PROPOSAL_ENC_ALGS_CTOS, 49 PROPOSAL_ENC_ALGS_STOC, 50 PROPOSAL_MAC_ALGS_CTOS, 51 PROPOSAL_MAC_ALGS_STOC, 52 PROPOSAL_COMP_ALGS_CTOS, 53 PROPOSAL_COMP_ALGS_STOC, 54 PROPOSAL_LANG_CTOS, 55 PROPOSAL_LANG_STOC, 56 PROPOSAL_MAX 57 }; 58 59 enum kex_modes { 60 MODE_IN, 61 MODE_OUT, 62 MODE_MAX 63 }; 64 65 enum kex_exchange { 66 KEX_DH_GRP1_SHA1, 67 KEX_DH_GRP14_SHA1, 68 KEX_DH_GEX_SHA1, 69 KEX_DH_GEX_SHA256, 70 KEX_MAX 71 }; 72 73 #define KEX_INIT_SENT 0x0001 74 75 typedef struct Kex Kex; 76 typedef struct Mac Mac; 77 typedef struct Comp Comp; 78 typedef struct Enc Enc; 79 typedef struct Newkeys Newkeys; 80 81 struct Enc { 82 char *name; 83 Cipher *cipher; 84 int enabled; 85 u_int key_len; 86 u_int block_size; 87 u_char *key; 88 u_char *iv; 89 }; 90 struct Mac { 91 char *name; 92 int enabled; 93 u_int mac_len; 94 u_char *key; 95 u_int key_len; 96 int type; 97 const EVP_MD *evp_md; 98 HMAC_CTX evp_ctx; 99 struct umac_ctx *umac_ctx; 100 }; 101 struct Comp { 102 int type; 103 int enabled; 104 char *name; 105 }; 106 struct Newkeys { 107 Enc enc; 108 Mac mac; 109 Comp comp; 110 }; 111 struct Kex { 112 u_char *session_id; 113 u_int session_id_len; 114 Newkeys *newkeys[MODE_MAX]; 115 u_int we_need; 116 int server; 117 char *name; 118 int hostkey_type; 119 int kex_type; 120 int roaming; 121 Buffer my; 122 Buffer peer; 123 sig_atomic_t done; 124 int flags; 125 const EVP_MD *evp_md; 126 char *client_version_string; 127 char *server_version_string; 128 int (*verify_host_key)(Key *); 129 Key *(*load_host_public_key)(int); 130 Key *(*load_host_private_key)(int); 131 int (*host_key_index)(Key *); 132 void (*kex[KEX_MAX])(Kex *); 133 }; 134 135 void kex_prop2buf(Buffer *, char *proposal[PROPOSAL_MAX]); 136 137 Kex *kex_setup(char *[PROPOSAL_MAX]); 138 void kex_finish(Kex *); 139 140 void kex_send_kexinit(Kex *); 141 void kex_input_kexinit(int, u_int32_t, void *); 142 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); 143 144 Newkeys *kex_get_newkeys(int); 145 146 void kexdh_client(Kex *); 147 void kexdh_server(Kex *); 148 void kexgex_client(Kex *); 149 void kexgex_server(Kex *); 150 151 void 152 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, 153 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); 154 void 155 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, 156 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, 157 BIGNUM *, BIGNUM *, u_char **, u_int *); 158 159 void 160 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); 161 162 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) 163 void dump_digest(char *, u_char *, int); 164 #endif 165 166 #endif 167