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_DSS "ssh-dss" 29 30 enum kex_init_proposals { 31 PROPOSAL_KEX_ALGS, 32 PROPOSAL_SERVER_HOST_KEY_ALGS, 33 PROPOSAL_ENC_ALGS_CTOS, 34 PROPOSAL_ENC_ALGS_STOC, 35 PROPOSAL_MAC_ALGS_CTOS, 36 PROPOSAL_MAC_ALGS_STOC, 37 PROPOSAL_COMP_ALGS_CTOS, 38 PROPOSAL_COMP_ALGS_STOC, 39 PROPOSAL_LANG_CTOS, 40 PROPOSAL_LANG_STOC, 41 PROPOSAL_MAX 42 }; 43 44 enum kex_modes { 45 MODE_IN, 46 MODE_OUT, 47 MODE_MAX 48 }; 49 50 typedef struct Kex Kex; 51 typedef struct Mac Mac; 52 typedef struct Comp Comp; 53 typedef struct Enc Enc; 54 55 struct Enc { 56 int type; 57 int enabled; 58 int block_size; 59 unsigned char *key; 60 unsigned char *iv; 61 int key_len; 62 int iv_len; 63 char *name; 64 }; 65 struct Mac { 66 EVP_MD *md; 67 int enabled; 68 int mac_len; 69 unsigned char *key; 70 int key_len; 71 char *name; 72 }; 73 struct Comp { 74 int type; 75 int enabled; 76 char *name; 77 }; 78 struct Kex { 79 Enc enc [MODE_MAX]; 80 Mac mac [MODE_MAX]; 81 Comp comp[MODE_MAX]; 82 int we_need; 83 int server; 84 char *name; 85 char *hostkeyalg; 86 }; 87 88 Buffer *kex_init(char *myproposal[PROPOSAL_MAX]); 89 void 90 kex_exchange_kexinit( 91 Buffer *my_kexinit, Buffer *peer_kexint, 92 char *peer_proposal[PROPOSAL_MAX]); 93 Kex * 94 kex_choose_conf(char *cprop[PROPOSAL_MAX], 95 char *sprop[PROPOSAL_MAX], int server); 96 int kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret); 97 void packet_set_kex(Kex *k); 98 int dh_pub_is_valid(DH *dh, BIGNUM *dh_pub); 99 DH *dh_new_group1(); 100 101 unsigned char * 102 kex_hash( 103 char *client_version_string, 104 char *server_version_string, 105 char *ckexinit, int ckexinitlen, 106 char *skexinit, int skexinitlen, 107 char *serverhostkeyblob, int sbloblen, 108 BIGNUM *client_dh_pub, 109 BIGNUM *server_dh_pub, 110 BIGNUM *shared_secret); 111 112 #endif 113