annotate algo.h @ 1790:42745af83b7d

Introduce extra delay before closing unauthenticated sessions To make it harder for attackers, introduce a delay to keep an unauthenticated session open a bit longer, thus blocking a connection slot until after the delay. Without this, while there is a limit on the amount of attempts an attacker can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to handle one attempt is still short and thus for each of the allowed parallel attempts many attempts can be chained one after the other. The attempt rate is then: "MAX_UNAUTH_PER_IP / <process time of one attempt>". With the delay, this rate becomes: "MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
author Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
date Wed, 15 Feb 2017 13:53:04 +0100
parents 41bf8f216644
children
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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_ALGO_H_
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27 #define DROPBEAR_ALGO_H_
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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 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 sigalgs[];
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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_delaycompress[];
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55 extern algo_type ssh_nocompress[];
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57 extern const struct dropbear_cipher dropbear_nocipher;
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58 extern const struct dropbear_cipher_mode dropbear_mode_none;
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59 extern const struct dropbear_hash dropbear_nohash;
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61 struct dropbear_cipher {
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62 const struct ltc_cipher_descriptor *cipherdesc;
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63 const unsigned long keysize;
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64 const unsigned char blocksize;
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65 };
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66
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67 struct dropbear_cipher_mode {
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68 int (*start)(int cipher, const unsigned char *IV,
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69 const unsigned char *key,
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70 int keylen, int num_rounds, void *cipher_state);
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71 int (*encrypt)(const unsigned char *pt, unsigned char *ct,
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72 unsigned long len, void *cipher_state);
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73 int (*decrypt)(const unsigned char *ct, unsigned char *pt,
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74 unsigned long len, void *cipher_state);
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75 int (*aead_crypt)(unsigned int seq,
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76 const unsigned char *in, unsigned char *out,
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77 unsigned long len, unsigned long taglen,
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78 void *cipher_state, int direction);
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79 int (*aead_getlength)(unsigned int seq,
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80 const unsigned char *in, unsigned int *outlen,
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81 unsigned long len, void *cipher_state);
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82 const struct dropbear_hash *aead_mac;
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83 };
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84
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85 struct dropbear_hash {
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86 const struct ltc_hash_descriptor *hash_desc;
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87 const unsigned long keysize;
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88 /* hashsize may be truncated from the size returned by hash_desc,
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89 eg sha1-96 */
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90 const unsigned char hashsize;
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91 };
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92
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93 enum dropbear_kex_mode {
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94 #if DROPBEAR_NORMAL_DH
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95 DROPBEAR_KEX_NORMAL_DH,
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96 #endif
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97 #if DROPBEAR_ECDH
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98 DROPBEAR_KEX_ECDH,
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99 #endif
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100 #if DROPBEAR_CURVE25519
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101 DROPBEAR_KEX_CURVE25519,
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102 #endif
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103 };
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104
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105 struct dropbear_kex {
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106 enum dropbear_kex_mode mode;
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107
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108 /* "normal" DH KEX */
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109 const unsigned char *dh_p_bytes;
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110 const int dh_p_len;
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111
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112 /* elliptic curve DH KEX */
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113 #if DROPBEAR_ECDH
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114 const struct dropbear_ecc_curve *ecc_curve;
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115 #else
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116 const void* dummy;
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117 #endif
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118
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119 /* both */
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120 const struct ltc_hash_descriptor *hash_desc;
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121 };
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122
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123 /* Includes all algorithms is useall is set */
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124 void buf_put_algolist_all(buffer * buf, const algo_type localalgos[], int useall);
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125 /* Includes "usable" algorithms */
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126 void buf_put_algolist(buffer * buf, const algo_type localalgos[]);
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127
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128 #define KEXGUESS2_ALGO_NAME "[email protected]"
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129
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130 int buf_has_algo(buffer *buf, const char *algo);
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131 algo_type * first_usable_algo(algo_type algos[]);
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132 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
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133 int kexguess2, int *goodguess);
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134
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135 #if DROPBEAR_USER_ALGO_LIST
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136 int check_user_algos(const char* user_algo_list, algo_type * algos,
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137 const char *algo_desc);
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138 char * algolist_string(const algo_type algos[]);
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139 #endif
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140
755
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141 enum {
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142 DROPBEAR_COMP_NONE,
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143 DROPBEAR_COMP_ZLIB,
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144 DROPBEAR_COMP_ZLIB_DELAY,
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145 };
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146
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147 #endif /* DROPBEAR_ALGO_H_ */