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annotate Python/random.c @ 78483:aaa68dce117e

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Remove now unused IntOrLongToString type
author Victor Stinner <victor.stinner@gmail.com>
date Thu, 09 Aug 2012 21:38:23 +0200
parents 198e31774f0f
children 6a782496f90a a53fc9982e2a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
75066
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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diff changeset
1 #include "Python.h"
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2 #ifdef MS_WINDOWS
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3 #include <windows.h>
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4 #else
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5 #include <fcntl.h>
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6 #endif
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7
75127
160a56eac332 ensure no one tries to hash things before the random seed is found
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8 #ifdef Py_DEBUG
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9 int _Py_HashSecret_Initialized = 0;
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10 #else
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11 static int _Py_HashSecret_Initialized = 0;
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12 #endif
75066
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13
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14 #ifdef MS_WINDOWS
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15 typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTA)(HCRYPTPROV *phProv,\
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16 LPCSTR pszContainer, LPCSTR pszProvider, DWORD dwProvType,\
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17 DWORD dwFlags );
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18 typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV hProv, DWORD dwLen,\
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19 BYTE *pbBuffer );
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20
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21 static CRYPTGENRANDOM pCryptGenRandom = NULL;
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22 /* This handle is never explicitly released. Instead, the operating
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23 system will release it when the process terminates. */
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24 static HCRYPTPROV hCryptProv = 0;
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25
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26 static int
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27 win32_urandom_init(int raise)
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28 {
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29 HINSTANCE hAdvAPI32 = NULL;
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30 CRYPTACQUIRECONTEXTA pCryptAcquireContext = NULL;
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31
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32 /* Obtain handle to the DLL containing CryptoAPI. This should not fail. */
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33 hAdvAPI32 = GetModuleHandle("advapi32.dll");
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34 if(hAdvAPI32 == NULL)
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35 goto error;
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36
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37 /* Obtain pointers to the CryptoAPI functions. This will fail on some early
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38 versions of Win95. */
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39 pCryptAcquireContext = (CRYPTACQUIRECONTEXTA)GetProcAddress(
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40 hAdvAPI32, "CryptAcquireContextA");
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41 if (pCryptAcquireContext == NULL)
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42 goto error;
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43
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44 pCryptGenRandom = (CRYPTGENRANDOM)GetProcAddress(hAdvAPI32,
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45 "CryptGenRandom");
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46 if (pCryptGenRandom == NULL)
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47 goto error;
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48
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49 /* Acquire context */
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50 if (! pCryptAcquireContext(&hCryptProv, NULL, NULL,
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51 PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
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52 goto error;
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53
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54 return 0;
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55
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56 error:
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57 if (raise)
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58 PyErr_SetFromWindowsErr(0);
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59 else
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60 Py_FatalError("Failed to initialize Windows random API (CryptoGen)");
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61 return -1;
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62 }
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63
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64 /* Fill buffer with size pseudo-random bytes generated by the Windows CryptoGen
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65 API. Return 0 on success, or -1 on error. */
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66 static int
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67 win32_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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68 {
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69 Py_ssize_t chunk;
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70
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71 if (hCryptProv == 0)
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72 {
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73 if (win32_urandom_init(raise) == -1)
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74 return -1;
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75 }
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76
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77 while (size > 0)
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78 {
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79 chunk = size > INT_MAX ? INT_MAX : size;
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80 if (!pCryptGenRandom(hCryptProv, chunk, buffer))
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81 {
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82 /* CryptGenRandom() failed */
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83 if (raise)
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84 PyErr_SetFromWindowsErr(0);
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85 else
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86 Py_FatalError("Failed to initialized the randomized hash "
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87 "secret using CryptoGen)");
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88 return -1;
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89 }
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90 buffer += chunk;
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91 size -= chunk;
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92 }
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93 return 0;
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94 }
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95 #endif /* MS_WINDOWS */
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96
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97
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98 #ifdef __VMS
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99 /* Use openssl random routine */
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100 #include <openssl/rand.h>
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101 static int
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102 vms_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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103 {
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104 if (RAND_pseudo_bytes(buffer, size) < 0) {
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105 if (raise) {
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106 PyErr_Format(PyExc_ValueError,
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107 "RAND_pseudo_bytes");
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108 } else {
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109 Py_FatalError("Failed to initialize the randomized hash "
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110 "secret using RAND_pseudo_bytes");
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111 }
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112 return -1;
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113 }
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114 return 0;
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115 }
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116 #endif /* __VMS */
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117
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118
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119 #if !defined(MS_WINDOWS) && !defined(__VMS)
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120
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121 /* Read size bytes from /dev/urandom into buffer.
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122 Call Py_FatalError() on error. */
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123 static void
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124 dev_urandom_noraise(char *buffer, Py_ssize_t size)
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125 {
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126 int fd;
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127 Py_ssize_t n;
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128
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129 assert (0 < size);
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130
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131 fd = open("/dev/urandom", O_RDONLY);
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132 if (fd < 0)
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133 Py_FatalError("Failed to open /dev/urandom");
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134
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135 while (0 < size)
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136 {
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137 do {
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138 n = read(fd, buffer, (size_t)size);
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139 } while (n < 0 && errno == EINTR);
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140 if (n <= 0)
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141 {
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142 /* stop on error or if read(size) returned 0 */
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143 Py_FatalError("Failed to read bytes from /dev/urandom");
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144 break;
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145 }
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146 buffer += n;
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147 size -= (Py_ssize_t)n;
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148 }
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149 close(fd);
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150 }
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151
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152 /* Read size bytes from /dev/urandom into buffer.
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153 Return 0 on success, raise an exception and return -1 on error. */
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154 static int
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155 dev_urandom_python(char *buffer, Py_ssize_t size)
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156 {
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157 int fd;
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158 Py_ssize_t n;
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159
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160 if (size <= 0)
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161 return 0;
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162
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163 Py_BEGIN_ALLOW_THREADS
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164 fd = open("/dev/urandom", O_RDONLY);
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165 Py_END_ALLOW_THREADS
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166 if (fd < 0)
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167 {
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168 PyErr_SetFromErrnoWithFilename(PyExc_OSError, "/dev/urandom");
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169 return -1;
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170 }
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171
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172 Py_BEGIN_ALLOW_THREADS
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173 do {
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174 do {
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175 n = read(fd, buffer, (size_t)size);
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176 } while (n < 0 && errno == EINTR);
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177 if (n <= 0)
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178 break;
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179 buffer += n;
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180 size -= (Py_ssize_t)n;
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181 } while (0 < size);
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182 Py_END_ALLOW_THREADS
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183
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184 if (n <= 0)
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185 {
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186 /* stop on error or if read(size) returned 0 */
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187 if (n < 0)
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188 PyErr_SetFromErrno(PyExc_OSError);
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189 else
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190 PyErr_Format(PyExc_RuntimeError,
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191 "Failed to read %zi bytes from /dev/urandom",
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192 size);
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193 close(fd);
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194 return -1;
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195 }
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196 close(fd);
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197 return 0;
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198 }
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199 #endif /* !defined(MS_WINDOWS) && !defined(__VMS) */
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200
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201 /* Fill buffer with pseudo-random bytes generated by a linear congruent
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202 generator (LCG):
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203
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204 x(n+1) = (x(n) * 214013 + 2531011) % 2^32
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205
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206 Use bits 23..16 of x(n) to generate a byte. */
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207 static void
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208 lcg_urandom(unsigned int x0, unsigned char *buffer, size_t size)
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209 {
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210 size_t index;
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211 unsigned int x;
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212
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213 x = x0;
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214 for (index=0; index < size; index++) {
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215 x *= 214013;
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216 x += 2531011;
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217 /* modulo 2 ^ (8 * sizeof(int)) */
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218 buffer[index] = (x >> 16) & 0xff;
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219 }
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220 }
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221
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222 /* Fill buffer with size pseudo-random bytes, not suitable for cryptographic
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223 use, from the operating random number generator (RNG).
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224
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225 Return 0 on success, raise an exception and return -1 on error. */
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226 int
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227 _PyOS_URandom(void *buffer, Py_ssize_t size)
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228 {
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229 if (size < 0) {
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230 PyErr_Format(PyExc_ValueError,
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231 "negative argument not allowed");
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232 return -1;
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233 }
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234 if (size == 0)
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235 return 0;
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236
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237 #ifdef MS_WINDOWS
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238 return win32_urandom((unsigned char *)buffer, size, 1);
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239 #else
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240 # ifdef __VMS
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241 return vms_urandom((unsigned char *)buffer, size, 1);
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242 # else
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243 return dev_urandom_python((char*)buffer, size);
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244 # endif
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245 #endif
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246 }
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247
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248 void
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249 _PyRandom_Init(void)
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250 {
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251 char *env;
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252 void *secret = &_Py_HashSecret;
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253 Py_ssize_t secret_size = sizeof(_Py_HashSecret_t);
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254
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255 if (_Py_HashSecret_Initialized)
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256 return;
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257 _Py_HashSecret_Initialized = 1;
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258
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259 /*
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260 Hash randomization is enabled. Generate a per-process secret,
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261 using PYTHONHASHSEED if provided.
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262 */
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263
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264 env = Py_GETENV("PYTHONHASHSEED");
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265 if (env && *env != '\0' && strcmp(env, "random") != 0) {
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266 char *endptr = env;
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267 unsigned long seed;
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268 seed = strtoul(env, &endptr, 10);
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269 if (*endptr != '\0'
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270 || seed > 4294967295UL
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271 || (errno == ERANGE && seed == ULONG_MAX))
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272 {
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273 Py_FatalError("PYTHONHASHSEED must be \"random\" or an integer "
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274 "in range [0; 4294967295]");
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275 }
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276 if (seed == 0) {
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277 /* disable the randomized hash */
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278 memset(secret, 0, secret_size);
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279 }
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280 else {
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281 lcg_urandom(seed, (unsigned char*)secret, secret_size);
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282 }
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283 }
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284 else {
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285 #ifdef MS_WINDOWS
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286 (void)win32_urandom((unsigned char *)secret, secret_size, 0);
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287 #else /* #ifdef MS_WINDOWS */
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288 # ifdef __VMS
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289 vms_urandom((unsigned char *)secret, secret_size, 0);
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290 # else
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291 dev_urandom_noraise((char*)secret, secret_size);
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292 # endif
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293 #endif
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294 }
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295 }