Mercurial > dropbear

annotate ltc_prng.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents d68d61e7056a
children
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rev   line source
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1 /* Copied from libtomcrypt/src/prngs/sprng.c and modified to
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2 * use Dropbear's genrandom(). */
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3
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4 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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5 *
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6 * LibTomCrypt is a library that provides various cryptographic
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7 * algorithms in a highly modular and flexible manner.
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8 *
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9 * The library is free for all purposes without any express
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10 * guarantee it works.
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11 *
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12 * Tom St Denis, [email protected], http://libtomcrypt.com
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13 */
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14 #include "includes.h"
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15 #include "dbrandom.h"
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16 #include "ltc_prng.h"
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17
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18 /**
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19 @file sprng.c
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20 Secure PRNG, Tom St Denis
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21 */
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22
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23 /* A secure PRNG using the RNG functions. Basically this is a
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24 * wrapper that allows you to use a secure RNG as a PRNG
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25 * in the various other functions.
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26 */
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27
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28 #if DROPBEAR_LTC_PRNG
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29
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30 /**
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31 Start the PRNG
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32 @param prng [out] The PRNG state to initialize
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33 @return CRYPT_OK if successful
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34 */
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35 int dropbear_prng_start(prng_state* UNUSED(prng))
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36 {
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37 return CRYPT_OK;
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38 }
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39
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40 /**
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41 Add entropy to the PRNG state
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42 @param in The data to add
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43 @param inlen Length of the data to add
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44 @param prng PRNG state to update
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45 @return CRYPT_OK if successful
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46 */
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47 int dropbear_prng_add_entropy(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
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48 {
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49 return CRYPT_OK;
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50 }
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51
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52 /**
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53 Make the PRNG ready to read from
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54 @param prng The PRNG to make active
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55 @return CRYPT_OK if successful
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56 */
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57 int dropbear_prng_ready(prng_state* UNUSED(prng))
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58 {
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59 return CRYPT_OK;
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60 }
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61
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62 /**
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63 Read from the PRNG
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64 @param out Destination
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65 @param outlen Length of output
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66 @param prng The active PRNG to read from
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67 @return Number of octets read
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68 */
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69 unsigned long dropbear_prng_read(unsigned char* out, unsigned long outlen, prng_state* UNUSED(prng))
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70 {
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71 LTC_ARGCHK(out != NULL);
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72 genrandom(out, outlen);
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73 return outlen;
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74 }
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75
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76 /**
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77 Terminate the PRNG
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78 @param prng The PRNG to terminate
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79 @return CRYPT_OK if successful
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80 */
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81 int dropbear_prng_done(prng_state* UNUSED(prng))
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82 {
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83 return CRYPT_OK;
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84 }
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85
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86 /**
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87 Export the PRNG state
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88 @param out [out] Destination
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89 @param outlen [in/out] Max size and resulting size of the state
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90 @param prng The PRNG to export
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91 @return CRYPT_OK if successful
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92 */
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93 int dropbear_prng_export(unsigned char* UNUSED(out), unsigned long* outlen, prng_state* UNUSED(prng))
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94 {
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95 LTC_ARGCHK(outlen != NULL);
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96
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97 *outlen = 0;
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98 return CRYPT_OK;
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99 }
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100
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101 /**
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102 Import a PRNG state
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103 @param in The PRNG state
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104 @param inlen Size of the state
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105 @param prng The PRNG to import
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106 @return CRYPT_OK if successful
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107 */
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108 int dropbear_prng_import(const unsigned char* UNUSED(in), unsigned long UNUSED(inlen), prng_state* UNUSED(prng))
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109 {
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110 return CRYPT_OK;
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111 }
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112
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113 /**
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114 PRNG self-test
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115 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled
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116 */
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117 int dropbear_prng_test(void)
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118 {
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119 return CRYPT_OK;
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120 }
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121
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122 const struct ltc_prng_descriptor dropbear_prng_desc =
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123 {
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124 "dropbear_prng", 0,
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125 dropbear_prng_start,
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126 dropbear_prng_add_entropy,
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127 dropbear_prng_ready,
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128 dropbear_prng_read,
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129 dropbear_prng_done,
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130 dropbear_prng_export,
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131 dropbear_prng_import,
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132 dropbear_prng_test
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133 };
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134
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135
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c19acba28590 use oldstyle comments
Matt Johnston <matt@ucc.asn.au>
parents: 761
diff changeset
136 #endif /* DROPBEAR_LTC_PRNG */