Mercurial > dropbear

annotate libtomcrypt/src/prngs/rng_get_bytes.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children
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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: $Format:%ai$ */