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annotate kex.h @ 1136:a7c4a70ae495

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Don't try to send data on first ack packet of 3way handshake. Cisco SSH on 15.4(3)M2 or similar can't handle it.
author Matt Johnston <matt@ucc.asn.au>
date Mon, 03 Aug 2015 20:53:37 +0800
parents deed0571cacc
children 82e2037d34ea
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef DROPBEAR_KEX_H_
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26 #define DROPBEAR_KEX_H_
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27
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28 #include "includes.h"
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29 #include "algo.h"
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30 #include "signkey.h"
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31
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32 void send_msg_kexinit();
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33 void recv_msg_kexinit();
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34 void send_msg_newkeys();
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35 void recv_msg_newkeys();
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36 void kexfirstinitialise();
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37
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38 struct kex_dh_param *gen_kexdh_param();
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39 void free_kexdh_param(struct kex_dh_param *param);
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40 void kexdh_comb_key(struct kex_dh_param *param, mp_int *dh_pub_them,
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41 sign_key *hostkey);
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42
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43 #ifdef DROPBEAR_ECDH
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44 struct kex_ecdh_param *gen_kexecdh_param();
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45 void free_kexecdh_param(struct kex_ecdh_param *param);
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46 void kexecdh_comb_key(struct kex_ecdh_param *param, buffer *pub_them,
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47 sign_key *hostkey);
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48 #endif
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49
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50 #ifdef DROPBEAR_CURVE25519
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51 struct kex_curve25519_param *gen_kexcurve25519_param();
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52 void free_kexcurve25519_param(struct kex_curve25519_param *param);
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53 void kexcurve25519_comb_key(struct kex_curve25519_param *param, buffer *pub_them,
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54 sign_key *hostkey);
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55 #endif
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56
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57 #ifndef DISABLE_ZLIB
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58 int is_compress_trans();
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59 int is_compress_recv();
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60 #endif
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61
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62 void recv_msg_kexdh_init(); /* server */
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63
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64 void send_msg_kexdh_init(); /* client */
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65 void recv_msg_kexdh_reply(); /* client */
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66
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67 struct KEXState {
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68
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69 unsigned sentkexinit : 1; /*set when we've sent/recv kexinit packet */
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70 unsigned recvkexinit : 1;
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71 unsigned them_firstfollows : 1; /* true when first_kex_packet_follows is set */
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72 unsigned sentnewkeys : 1; /* set once we've send MSG_NEWKEYS (will be cleared once we have also received */
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73 unsigned recvnewkeys : 1; /* set once we've received MSG_NEWKEYS (cleared once we have also sent */
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74
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75 unsigned donefirstkex : 1; /* Set to 1 after the first kex has completed,
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76 ie the transport layer has been set up */
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77
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78 unsigned our_first_follows_matches : 1;
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79
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80 time_t lastkextime; /* time of the last kex */
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81 unsigned int datatrans; /* data transmitted since last kex */
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82 unsigned int datarecv; /* data received since last kex */
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83
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84 };
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85
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86 #define DH_P_1_LEN 128
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87 extern const unsigned char dh_p_1[DH_P_1_LEN];
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88 #define DH_P_14_LEN 256
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89 extern const unsigned char dh_p_14[DH_P_14_LEN];
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90
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91 struct kex_dh_param {
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92 mp_int pub; /* e */
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93 mp_int priv; /* x */
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94 };
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95
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96 #ifdef DROPBEAR_ECDH
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97 struct kex_ecdh_param {
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98 ecc_key key;
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99 };
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100 #endif
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101
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102 #ifdef DROPBEAR_CURVE25519
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103 #define CURVE25519_LEN 32
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104 struct kex_curve25519_param {
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105 unsigned char priv[CURVE25519_LEN];
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106 unsigned char pub[CURVE25519_LEN];
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107 };
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108
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109 /* No header file for curve25519_donna */
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110 int curve25519_donna(unsigned char *out, const unsigned char *secret, const unsigned char *other);
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111 #endif
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112
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113
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114 #define MAX_KEXHASHBUF 2000
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115
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116 #endif /* DROPBEAR_KEX_H_ */