1 /* 2 * Copyright (c) 2000 Markus Friedl. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 #ifndef KEX_H 25 #define KEX_H 26 27 #define KEX_DH1 "diffie-hellman-group1-sha1" 28 #define KEX_DHGEX "diffie-hellman-group-exchange-sha1" 29 #define KEX_DSS "ssh-dss" 30 31 enum kex_init_proposals { 32 PROPOSAL_KEX_ALGS, 33 PROPOSAL_SERVER_HOST_KEY_ALGS, 34 PROPOSAL_ENC_ALGS_CTOS, 35 PROPOSAL_ENC_ALGS_STOC, 36 PROPOSAL_MAC_ALGS_CTOS, 37 PROPOSAL_MAC_ALGS_STOC, 38 PROPOSAL_COMP_ALGS_CTOS, 39 PROPOSAL_COMP_ALGS_STOC, 40 PROPOSAL_LANG_CTOS, 41 PROPOSAL_LANG_STOC, 42 PROPOSAL_MAX 43 }; 44 45 enum kex_modes { 46 MODE_IN, 47 MODE_OUT, 48 MODE_MAX 49 }; 50 51 enum kex_exchange { 52 DH_GRP1_SHA1, 53 DH_GEX_SHA1 54 }; 55 56 typedef struct Kex Kex; 57 typedef struct Mac Mac; 58 typedef struct Comp Comp; 59 typedef struct Enc Enc; 60 61 struct Enc { 62 char *name; 63 Cipher *cipher; 64 int enabled; 65 unsigned char *key; 66 unsigned char *iv; 67 }; 68 struct Mac { 69 char *name; 70 int enabled; 71 EVP_MD *md; 72 int mac_len; 73 unsigned char *key; 74 int key_len; 75 }; 76 struct Comp { 77 int type; 78 int enabled; 79 char *name; 80 }; 81 struct Kex { 82 Enc enc [MODE_MAX]; 83 Mac mac [MODE_MAX]; 84 Comp comp[MODE_MAX]; 85 int we_need; 86 int server; 87 char *name; 88 char *hostkeyalg; 89 int kex_type; 90 }; 91 92 Buffer *kex_init(char *myproposal[PROPOSAL_MAX]); 93 void 94 kex_exchange_kexinit( 95 Buffer *my_kexinit, Buffer *peer_kexint, 96 char *peer_proposal[PROPOSAL_MAX]); 97 Kex * 98 kex_choose_conf(char *cprop[PROPOSAL_MAX], 99 char *sprop[PROPOSAL_MAX], int server); 100 int kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret); 101 void packet_set_kex(Kex *k); 102 int dh_pub_is_valid(DH *dh, BIGNUM *dh_pub); 103 DH *dh_new_group_asc(const char *, const char *); 104 DH *dh_new_group(BIGNUM *, BIGNUM *); 105 DH *dh_new_group1(); 106 107 unsigned char * 108 kex_hash( 109 char *client_version_string, 110 char *server_version_string, 111 char *ckexinit, int ckexinitlen, 112 char *skexinit, int skexinitlen, 113 char *serverhostkeyblob, int sbloblen, 114 BIGNUM *client_dh_pub, 115 BIGNUM *server_dh_pub, 116 BIGNUM *shared_secret); 117 118 unsigned char * 119 kex_hash_gex( 120 char *client_version_string, 121 char *server_version_string, 122 char *ckexinit, int ckexinitlen, 123 char *skexinit, int skexinitlen, 124 char *serverhostkeyblob, int sbloblen, 125 int minbits, BIGNUM *prime, BIGNUM *gen, 126 BIGNUM *client_dh_pub, 127 BIGNUM *server_dh_pub, 128 BIGNUM *shared_secret); 129 #endif 130