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annotate Python/random.c @ 84172:e353f64dfd95

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importlib.abc.SourceLoader.get_source() was re-raising SyntaxError and UnicodeDecodeError as ImportError. That was over-reaching the point of raising ImportError in get_source() (which is to signal the source code was not found when it should have). Conflating the two exceptions with ImportError could lead to masking errors with the source which should be known outside of whether there was an error simply getting the source to begin with.
author Brett Cannon <brett@python.org>
date Sun, 16 Jun 2013 18:05:54 -0400
parents e52df05b496a
children fe949918616c
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
75127
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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
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94 /* Read size bytes from /dev/urandom into buffer.
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95 Call Py_FatalError() on error. */
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96 static void
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97 dev_urandom_noraise(char *buffer, Py_ssize_t size)
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98 {
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99 int fd;
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100 Py_ssize_t n;
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101
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102 assert (0 < size);
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103
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104 fd = open("/dev/urandom", O_RDONLY);
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105 if (fd < 0)
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106 Py_FatalError("Failed to open /dev/urandom");
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107
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108 while (0 < size)
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109 {
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110 do {
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111 n = read(fd, buffer, (size_t)size);
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112 } while (n < 0 && errno == EINTR);
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113 if (n <= 0)
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114 {
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115 /* stop on error or if read(size) returned 0 */
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116 Py_FatalError("Failed to read bytes from /dev/urandom");
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117 break;
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118 }
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119 buffer += n;
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120 size -= (Py_ssize_t)n;
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121 }
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122 close(fd);
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123 }
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124
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125 /* Read size bytes from /dev/urandom into buffer.
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126 Return 0 on success, raise an exception and return -1 on error. */
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127 static int
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128 dev_urandom_python(char *buffer, Py_ssize_t size)
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129 {
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130 int fd;
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131 Py_ssize_t n;
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132
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133 if (size <= 0)
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134 return 0;
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135
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136 Py_BEGIN_ALLOW_THREADS
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137 fd = open("/dev/urandom", O_RDONLY);
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138 Py_END_ALLOW_THREADS
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139 if (fd < 0)
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140 {
78901
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141 PyErr_SetString(PyExc_NotImplementedError,
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142 "/dev/urandom (or equivalent) not found");
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143 return -1;
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144 }
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145
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146 Py_BEGIN_ALLOW_THREADS
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147 do {
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148 do {
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149 n = read(fd, buffer, (size_t)size);
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150 } while (n < 0 && errno == EINTR);
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151 if (n <= 0)
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152 break;
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153 buffer += n;
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154 size -= (Py_ssize_t)n;
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155 } while (0 < size);
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156 Py_END_ALLOW_THREADS
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157
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158 if (n <= 0)
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159 {
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160 /* stop on error or if read(size) returned 0 */
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161 if (n < 0)
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162 PyErr_SetFromErrno(PyExc_OSError);
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163 else
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164 PyErr_Format(PyExc_RuntimeError,
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165 "Failed to read %zi bytes from /dev/urandom",
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166 size);
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167 close(fd);
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168 return -1;
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169 }
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170 close(fd);
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171 return 0;
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172 }
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173 #endif /* !defined(MS_WINDOWS) && !defined(__VMS) */
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174
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175 /* Fill buffer with pseudo-random bytes generated by a linear congruent
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176 generator (LCG):
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177
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178 x(n+1) = (x(n) * 214013 + 2531011) % 2^32
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179
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180 Use bits 23..16 of x(n) to generate a byte. */
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181 static void
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182 lcg_urandom(unsigned int x0, unsigned char *buffer, size_t size)
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183 {
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184 size_t index;
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185 unsigned int x;
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186
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187 x = x0;
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188 for (index=0; index < size; index++) {
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189 x *= 214013;
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190 x += 2531011;
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191 /* modulo 2 ^ (8 * sizeof(int)) */
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192 buffer[index] = (x >> 16) & 0xff;
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193 }
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194 }
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195
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196 /* Fill buffer with size pseudo-random bytes, not suitable for cryptographic
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197 use, from the operating random number generator (RNG).
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198
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199 Return 0 on success, raise an exception and return -1 on error. */
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200 int
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201 _PyOS_URandom(void *buffer, Py_ssize_t size)
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202 {
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203 if (size < 0) {
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204 PyErr_Format(PyExc_ValueError,
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205 "negative argument not allowed");
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206 return -1;
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207 }
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208 if (size == 0)
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209 return 0;
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210
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211 #ifdef MS_WINDOWS
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212 return win32_urandom((unsigned char *)buffer, size, 1);
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213 #else
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214 # ifdef __VMS
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215 return vms_urandom((unsigned char *)buffer, size, 1);
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216 # else
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217 return dev_urandom_python((char*)buffer, size);
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218 # endif
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219 #endif
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220 }
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221
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222 void
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223 _PyRandom_Init(void)
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224 {
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225 char *env;
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226 void *secret = &_Py_HashSecret;
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227 Py_ssize_t secret_size = sizeof(_Py_HashSecret_t);
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228
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229 if (_Py_HashSecret_Initialized)
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230 return;
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231 _Py_HashSecret_Initialized = 1;
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232
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233 /*
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234 Hash randomization is enabled. Generate a per-process secret,
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235 using PYTHONHASHSEED if provided.
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236 */
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237
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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238 env = Py_GETENV("PYTHONHASHSEED");
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ab1886e7fc19 Fix typo in conditional.
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239 if (env && *env != '\0' && strcmp(env, "random") != 0) {
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f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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240 char *endptr = env;
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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241 unsigned long seed;
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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242 seed = strtoul(env, &endptr, 10);
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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243 if (*endptr != '\0'
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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244 || seed > 4294967295UL
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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245 || (errno == ERANGE && seed == ULONG_MAX))
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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246 {
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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247 Py_FatalError("PYTHONHASHSEED must be \"random\" or an integer "
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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248 "in range [0; 4294967295]");
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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249 }
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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250 if (seed == 0) {
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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251 /* disable the randomized hash */
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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252 memset(secret, 0, secret_size);
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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253 }
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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254 else {
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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255 lcg_urandom(seed, (unsigned char*)secret, secret_size);
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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256 }
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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257 }
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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258 else {
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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259 #ifdef MS_WINDOWS
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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260 (void)win32_urandom((unsigned char *)secret, secret_size, 0);
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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261 #else /* #ifdef MS_WINDOWS */
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262 # ifdef __VMS
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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263 vms_urandom((unsigned char *)secret, secret_size, 0);
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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264 # else
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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265 dev_urandom_noraise((char*)secret, secret_size);
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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266 # endif
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267 #endif
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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268 }
f4b7ecf8a5f8 Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
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269 }