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annotate Python/random.c @ 86823:17d730d37b2f

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Issue #19410: Put back in special-casing of '' for importlib.machinery.FileFinder. While originally moved to stop special-casing '' as PathFinder farther up the typical call chain now uses the cwd in the instance of '', it was deemed an unnecessary risk to breaking subclasses of FileFinder to take the special-casing out.
author Brett Cannon <brett@python.org>
date Fri, 01 Nov 2013 10:37:57 -0400
parents b0295cc736d8
children baab11a466ab
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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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
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13
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14 #ifdef MS_WINDOWS
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15 /* This handle is never explicitly released. Instead, the operating
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16 system will release it when the process terminates. */
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17 static HCRYPTPROV hCryptProv = 0;
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18
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19 static int
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20 win32_urandom_init(int raise)
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21 {
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22 /* Acquire context */
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23 if (!CryptAcquireContext(&hCryptProv, NULL, NULL,
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24 PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
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25 goto error;
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26
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27 return 0;
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28
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29 error:
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30 if (raise)
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31 PyErr_SetFromWindowsErr(0);
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32 else
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33 Py_FatalError("Failed to initialize Windows random API (CryptoGen)");
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34 return -1;
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35 }
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36
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37 /* Fill buffer with size pseudo-random bytes generated by the Windows CryptoGen
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38 API. Return 0 on success, or -1 on error. */
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39 static int
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40 win32_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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41 {
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42 Py_ssize_t chunk;
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43
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44 if (hCryptProv == 0)
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45 {
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46 if (win32_urandom_init(raise) == -1)
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47 return -1;
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48 }
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49
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50 while (size > 0)
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51 {
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52 chunk = size > INT_MAX ? INT_MAX : size;
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53 if (!CryptGenRandom(hCryptProv, chunk, buffer))
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54 {
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55 /* CryptGenRandom() failed */
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56 if (raise)
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57 PyErr_SetFromWindowsErr(0);
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58 else
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59 Py_FatalError("Failed to initialized the randomized hash "
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60 "secret using CryptoGen)");
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61 return -1;
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62 }
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63 buffer += chunk;
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64 size -= chunk;
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65 }
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66 return 0;
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67 }
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68 #endif /* MS_WINDOWS */
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69
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70
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71 #ifdef __VMS
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72 /* Use openssl random routine */
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73 #include <openssl/rand.h>
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74 static int
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75 vms_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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76 {
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77 if (RAND_pseudo_bytes(buffer, size) < 0) {
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78 if (raise) {
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79 PyErr_Format(PyExc_ValueError,
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80 "RAND_pseudo_bytes");
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81 } else {
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82 Py_FatalError("Failed to initialize the randomized hash "
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83 "secret using RAND_pseudo_bytes");
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84 }
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85 return -1;
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86 }
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87 return 0;
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88 }
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89 #endif /* __VMS */
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90
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91
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92 #if !defined(MS_WINDOWS) && !defined(__VMS)
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93 static int urandom_fd = -1;
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94
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95 /* Read size bytes from /dev/urandom into buffer.
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96 Call Py_FatalError() on error. */
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97 static void
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98 dev_urandom_noraise(char *buffer, Py_ssize_t size)
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99 {
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100 int fd;
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101 Py_ssize_t n;
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102
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103 assert (0 < size);
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104
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105 fd = _Py_open("/dev/urandom", O_RDONLY);
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106 if (fd < 0)
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107 Py_FatalError("Failed to open /dev/urandom");
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108
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109 while (0 < size)
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110 {
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111 do {
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112 n = read(fd, buffer, (size_t)size);
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113 } while (n < 0 && errno == EINTR);
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114 if (n <= 0)
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115 {
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116 /* stop on error or if read(size) returned 0 */
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117 Py_FatalError("Failed to read bytes from /dev/urandom");
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118 break;
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119 }
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120 buffer += n;
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121 size -= (Py_ssize_t)n;
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122 }
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123 close(fd);
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124 }
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125
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126 /* Read size bytes from /dev/urandom into buffer.
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127 Return 0 on success, raise an exception and return -1 on error. */
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128 static int
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129 dev_urandom_python(char *buffer, Py_ssize_t size)
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130 {
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131 int fd;
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132 Py_ssize_t n;
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133
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134 if (size <= 0)
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135 return 0;
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136
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137 if (urandom_fd >= 0)
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138 fd = urandom_fd;
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139 else {
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140 Py_BEGIN_ALLOW_THREADS
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141 fd = _Py_open("/dev/urandom", O_RDONLY);
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142 Py_END_ALLOW_THREADS
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143 if (fd < 0)
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144 {
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145 if (errno == ENOENT || errno == ENXIO ||
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146 errno == ENODEV || errno == EACCES)
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147 PyErr_SetString(PyExc_NotImplementedError,
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148 "/dev/urandom (or equivalent) not found");
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149 else
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150 PyErr_SetFromErrno(PyExc_OSError);
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151 return -1;
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152 }
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153 if (urandom_fd >= 0) {
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154 /* urandom_fd was initialized by another thread while we were
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155 not holding the GIL, keep it. */
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156 close(fd);
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157 fd = urandom_fd;
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158 }
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159 else
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160 urandom_fd = fd;
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161 }
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162
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163 Py_BEGIN_ALLOW_THREADS
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164 do {
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165 do {
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166 n = read(fd, buffer, (size_t)size);
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167 } while (n < 0 && errno == EINTR);
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168 if (n <= 0)
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169 break;
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170 buffer += n;
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171 size -= (Py_ssize_t)n;
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172 } while (0 < size);
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173 Py_END_ALLOW_THREADS
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174
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175 if (n <= 0)
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176 {
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177 /* stop on error or if read(size) returned 0 */
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178 if (n < 0)
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179 PyErr_SetFromErrno(PyExc_OSError);
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180 else
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181 PyErr_Format(PyExc_RuntimeError,
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182 "Failed to read %zi bytes from /dev/urandom",
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183 size);
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184 return -1;
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185 }
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186 return 0;
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187 }
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188
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189 static void
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190 dev_urandom_close(void)
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191 {
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192 if (urandom_fd >= 0) {
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193 close(urandom_fd);
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194 urandom_fd = -1;
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195 }
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196 }
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197
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198 #endif /* !defined(MS_WINDOWS) && !defined(__VMS) */
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199
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200 /* Fill buffer with pseudo-random bytes generated by a linear congruent
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201 generator (LCG):
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202
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203 x(n+1) = (x(n) * 214013 + 2531011) % 2^32
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204
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205 Use bits 23..16 of x(n) to generate a byte. */
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206 static void
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207 lcg_urandom(unsigned int x0, unsigned char *buffer, size_t size)
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208 {
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209 size_t index;
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210 unsigned int x;
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211
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212 x = x0;
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213 for (index=0; index < size; index++) {
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214 x *= 214013;
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215 x += 2531011;
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216 /* modulo 2 ^ (8 * sizeof(int)) */
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217 buffer[index] = (x >> 16) & 0xff;
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218 }
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219 }
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220
86107
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221 /* Fill buffer with size pseudo-random bytes from the operating system random
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222 number generator (RNG). It is suitable for for most cryptographic purposes
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223 except long living private keys for asymmetric encryption.
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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 }
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296
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297 void
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298 _PyRandom_Fini(void)
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299 {
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300 #if !defined(MS_WINDOWS) && !defined(__VMS)
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301 dev_urandom_close();
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302 #endif
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303 }