Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_get_bytes.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 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9 #include "tomcrypt.h"
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10
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11 #ifdef LTC_RNG_GET_BYTES
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12 /**
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13 @file rng_get_bytes.c
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14 portable way to get secure random bits to feed a PRNG (Tom St Denis)
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15 */
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16
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17 #if defined(LTC_DEVRANDOM) && !defined(_WIN32)
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18 /* on *NIX read /dev/random */
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19 static unsigned long _rng_nix(unsigned char *buf, unsigned long len,
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20 void (*callback)(void))
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21 {
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22 #ifdef LTC_NO_FILE
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23 LTC_UNUSED_PARAM(callback);
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24 LTC_UNUSED_PARAM(buf);
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25 LTC_UNUSED_PARAM(len);
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26 return 0;
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27 #else
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28 FILE *f;
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29 unsigned long x;
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30 LTC_UNUSED_PARAM(callback);
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31 #ifdef LTC_TRY_URANDOM_FIRST
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32 f = fopen("/dev/urandom", "rb");
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33 if (f == NULL)
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34 #endif /* LTC_TRY_URANDOM_FIRST */
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35 f = fopen("/dev/random", "rb");
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37 if (f == NULL) {
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38 return 0;
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39 }
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40
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41 /* disable buffering */
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42 if (setvbuf(f, NULL, _IONBF, 0) != 0) {
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43 fclose(f);
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44 return 0;
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45 }
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46
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47 x = (unsigned long)fread(buf, 1, (size_t)len, f);
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48 fclose(f);
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49 return x;
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50 #endif /* LTC_NO_FILE */
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51 }
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52
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53 #endif /* LTC_DEVRANDOM */
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54
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55 #if !defined(_WIN32_WCE)
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56
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57 #define ANSI_RNG
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58
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59 static unsigned long _rng_ansic(unsigned char *buf, unsigned long len,
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60 void (*callback)(void))
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61 {
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62 clock_t t1;
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63 int l, acc, bits, a, b;
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64
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65 l = len;
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66 bits = 8;
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67 acc = a = b = 0;
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68 while (len--) {
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69 if (callback != NULL) callback();
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70 while (bits--) {
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71 do {
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72 t1 = XCLOCK(); while (t1 == XCLOCK()) a ^= 1;
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73 t1 = XCLOCK(); while (t1 == XCLOCK()) b ^= 1;
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74 } while (a == b);
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75 acc = (acc << 1) | a;
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76 }
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77 *buf++ = acc;
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78 acc = 0;
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79 bits = 8;
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80 }
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81 return l;
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82 }
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83
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84 #endif
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85
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86 /* Try the Microsoft CSP */
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87 #if defined(_WIN32) || defined(_WIN32_WCE)
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88 #ifndef _WIN32_WINNT
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89 #define _WIN32_WINNT 0x0400
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90 #endif
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91 #ifdef _WIN32_WCE
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92 #define UNDER_CE
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93 #define ARM
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94 #endif
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95
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96 #define WIN32_LEAN_AND_MEAN
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97 #include <windows.h>
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98 #include <wincrypt.h>
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99
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100 static unsigned long _rng_win32(unsigned char *buf, unsigned long len,
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101 void (*callback)(void))
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102 {
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103 HCRYPTPROV hProv = 0;
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104 LTC_UNUSED_PARAM(callback);
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105 if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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106 (CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) &&
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107 !CryptAcquireContext (&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL,
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108 CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET))
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109 return 0;
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110
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111 if (CryptGenRandom(hProv, len, buf) == TRUE) {
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112 CryptReleaseContext(hProv, 0);
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113 return len;
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114 } else {
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115 CryptReleaseContext(hProv, 0);
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116 return 0;
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117 }
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118 }
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119
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120 #endif /* WIN32 */
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121
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122 /**
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123 Read the system RNG
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124 @param out Destination
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125 @param outlen Length desired (octets)
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126 @param callback Pointer to void function to act as "callback" when RNG is slow. This can be NULL
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127 @return Number of octets read
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128 */
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129 unsigned long rng_get_bytes(unsigned char *out, unsigned long outlen,
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130 void (*callback)(void))
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131 {
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132 unsigned long x;
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133
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134 LTC_ARGCHK(out != NULL);
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135
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136 #ifdef LTC_PRNG_ENABLE_LTC_RNG
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137 if (ltc_rng) {
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138 x = ltc_rng(out, outlen, callback);
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139 if (x != 0) {
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140 return x;
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141 }
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142 }
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143 #endif
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144
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145 #if defined(_WIN32) || defined(_WIN32_WCE)
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146 x = _rng_win32(out, outlen, callback); if (x != 0) { return x; }
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147 #elif defined(LTC_DEVRANDOM)
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148 x = _rng_nix(out, outlen, callback); if (x != 0) { return x; }
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149 #endif
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150 #ifdef ANSI_RNG
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151 x = _rng_ansic(out, outlen, callback); if (x != 0) { return x; }
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152 #endif
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153 return 0;
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154 }
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155 #endif /* #ifdef LTC_RNG_GET_BYTES */
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156
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157 /* ref: $Format:%D$ */
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158 /* git commit: $Format:%H$ */
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159 /* commit time: $Format:%ai$ */