crypto/openssh/kex.h

   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