Mercurial > dropbear

annotate algo.h @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents c19acba28590
children 47643024fc90
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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 _ALGO_H_
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27 #define _ALGO_H_
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28
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29 #include "includes.h"
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30 #include "buffer.h"
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31
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32 #define DROPBEAR_MODE_UNUSED 0
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33 #define DROPBEAR_MODE_CBC 1
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34 #define DROPBEAR_MODE_CTR 2
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35
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36 struct Algo_Type {
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37
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38 const unsigned char *name; /* identifying name */
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39 char val; /* a value for this cipher, or -1 for invalid */
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40 const void *data; /* algorithm specific data */
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41 char usable; /* whether we can use this algorithm */
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42 const void *mode; /* the mode, currently only used for ciphers,
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43 points to a 'struct dropbear_cipher_mode' */
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44 };
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45
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46 typedef struct Algo_Type algo_type;
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47
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48 /* lists mapping ssh types of algorithms to internal values */
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49 extern algo_type sshkex[];
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50 extern algo_type sshhostkey[];
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51 extern algo_type sshciphers[];
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52 extern algo_type sshhashes[];
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53 extern algo_type ssh_compress[];
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54 extern algo_type ssh_nocompress[];
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55
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56 extern const struct dropbear_cipher dropbear_nocipher;
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57 extern const struct dropbear_cipher_mode dropbear_mode_none;
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58 extern const struct dropbear_hash dropbear_nohash;
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59
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60 struct dropbear_cipher {
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61 const struct ltc_cipher_descriptor *cipherdesc;
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62 const unsigned long keysize;
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63 const unsigned char blocksize;
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64 };
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65
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66 struct dropbear_cipher_mode {
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67 int (*start)(int cipher, const unsigned char *IV,
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68 const unsigned char *key,
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69 int keylen, int num_rounds, void *cipher_state);
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70 int (*encrypt)(const unsigned char *pt, unsigned char *ct,
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71 unsigned long len, void *cipher_state);
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72 int (*decrypt)(const unsigned char *ct, unsigned char *pt,
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73 unsigned long len, void *cipher_state);
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74 };
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75
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76 struct dropbear_hash {
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77 const struct ltc_hash_descriptor *hash_desc;
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78 const unsigned long keysize;
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79 /* hashsize may be truncated from the size returned by hash_desc,
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80 eg sha1-96 */
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81 const unsigned char hashsize;
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82 };
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83
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84 enum dropbear_kex_mode {
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85 DROPBEAR_KEX_NORMAL_DH,
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86 DROPBEAR_KEX_ECDH,
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87 DROPBEAR_KEX_CURVE25519,
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88 };
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89
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90 struct dropbear_kex {
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91 enum dropbear_kex_mode mode;
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92
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93 /* "normal" DH KEX */
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94 const unsigned char *dh_p_bytes;
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95 const int dh_p_len;
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96
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97 /* elliptic curve DH KEX */
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98 #ifdef DROPBEAR_ECDH
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99 const struct dropbear_ecc_curve *ecc_curve;
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100 #else
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101 const void* dummy;
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102 #endif
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103
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104 /* both */
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105 const struct ltc_hash_descriptor *hash_desc;
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106 };
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107
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108 int have_algo(char* algo, size_t algolen, algo_type algos[]);
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109 void buf_put_algolist(buffer * buf, algo_type localalgos[]);
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110
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111 enum kexguess2_used {
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112 KEXGUESS2_LOOK,
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113 KEXGUESS2_NO,
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114 KEXGUESS2_YES,
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115 };
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116
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117 #define KEXGUESS2_ALGO_NAME "[email protected]"
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118 #define KEXGUESS2_ALGO_ID 99
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119
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120
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121 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
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122 enum kexguess2_used *kexguess2, int *goodguess);
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124 #ifdef ENABLE_USER_ALGO_LIST
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125 int check_user_algos(const char* user_algo_list, algo_type * algos,
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126 const char *algo_desc);
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127 char * algolist_string(algo_type algos[]);
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128 #endif
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129
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130 enum {
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131 DROPBEAR_COMP_NONE,
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132 DROPBEAR_COMP_ZLIB,
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133 DROPBEAR_COMP_ZLIB_DELAY,
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134 };
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135
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136 #endif /* _ALGO_H_ */