prosody
3d2c2f0809ee
util-src/crand.c

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util-src/crand.c @ 7187:3d2c2f0809ee

util.crand: C binding to one of OpenSSL, Linux getrandom() or OpenBSD arc4random() CSPRNG
author Kim Alvefur <zash@zash.se>
date Mon, 22 Feb 2016 18:44:43 +0100
child 7189:72839cafdf36
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rev   line source
7187
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1 /* Prosody IM
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2 -- Copyright (C) 2008-2016 Matthew Wild
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3 -- Copyright (C) 2008-2016 Waqas Hussain
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4 -- Copyright (C) 2016 Kim Alvefur
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9 */
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10
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11 /*
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12 * crand.c
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13 * C PRNG interface
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14 */
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15
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16 #include "lualib.h"
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17 #include "lauxlib.h"
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18
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19 #include <string.h>
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20 #include <errno.h>
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21
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22 /*
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23 * TODO: Decide on fixed size or dynamically allocated buffer
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24 */
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25 #if 1
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26 #include <malloc.h>
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27 #else
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28 #define BUFLEN 256
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29 #endif
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30
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31 #if defined(WITH_GETRANDOM)
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32 #include <unistd.h>
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33 #include <sys/syscall.h>
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34 #include <linux/random.h>
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35
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36 #ifndef SYS_getrandom
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37 #error getrandom() requires Linux 3.17 or later
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38 #endif
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39
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40 /* Was this not supposed to be a function? */
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41 int getrandom(char *buf, size_t len, int flags) {
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42 return syscall(SYS_getrandom, buf, len, flags);
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43 }
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44
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45 #elif defined(WITH_ARC4RANDOM)
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46 #include <stdlib.h>
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47 #elif defined(WITH_OPENSSL)
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48 #include <openssl/rand.h>
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49 #else
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50 #error util.crand compiled without a random source
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51 #endif
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52
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53 int Lrandom(lua_State *L) {
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54 #ifdef BUFLEN
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55 unsigned char buf[BUFLEN];
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56 #else
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57 unsigned char *buf;
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58 #endif
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59 int ret = 0;
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60 size_t len = (size_t)luaL_checkint(L, 1);
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61 #ifdef BUFLEN
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62 len = len > BUFLEN ? BUFLEN : len;
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63 #else
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64 buf = malloc(len);
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65
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66 if(buf == NULL) {
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67 lua_pushnil(L);
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68 lua_pushstring(L, "out of memory");
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69 /* or it migth be better to
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70 * return lua_error(L);
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71 */
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72 return 2;
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73 }
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74 #endif
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75
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76 #if defined(WITH_GETRANDOM)
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77 ret = getrandom(buf, len, 0);
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78
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79 if(ret < 0) {
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80 #ifndef BUFLEN
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81 free(buf);
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82 #endif
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83 lua_pushnil(L);
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84 lua_pushstring(L, strerror(errno));
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85 lua_pushinteger(L, errno);
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86 return 3;
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87 }
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88
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89 #elif defined(WITH_ARC4RANDOM)
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90 arc4random_buf(buf, len);
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91 ret = len;
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92 #elif defined(WITH_OPENSSL)
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93 ret = RAND_bytes(buf, len);
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94
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95 if(ret == 1) {
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96 ret = len;
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97 } else {
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98 #ifndef BUFLEN
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99 free(buf);
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100 #endif
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101 lua_pushnil(L);
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102 lua_pushstring(L, "failed");
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103 /* lua_pushinteger(L, ERR_get_error()); */
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104 return 2;
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105 }
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106
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107 #endif
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108
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109 lua_pushlstring(L, buf, ret);
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110 #ifndef BUFLEN
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111 free(buf);
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112 #endif
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113 return 1;
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114 }
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115
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116 #ifdef ENABLE_SEEDING
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117 int Lseed(lua_State *L) {
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118 size_t len;
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119 const char *seed = lua_tolstring(L, 1, &len);
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120
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121 #if defined(WITH_OPENSSL)
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122 RAND_add(seed, len, len);
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123 return 0;
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124 #else
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125 lua_pushnil(L);
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126 lua_pushliteral(L, "not-supported");
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127 return 2;
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128 #endif
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129 }
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130 #endif
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131
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132 int luaopen_util_crand(lua_State *L) {
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133 lua_newtable(L);
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134 lua_pushcfunction(L, Lrandom);
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135 lua_setfield(L, -2, "bytes");
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136 #ifdef ENABLE_SEEDING
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137 lua_pushcfunction(L, Lseed);
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138 lua_setfield(L, -2, "seed");
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139 #endif
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140
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141 #if defined(WITH_GETRANDOM)
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142 lua_pushstring(L, "Linux");
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143 #elif defined(WITH_ARC4RANDOM)
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144 lua_pushstring(L, "arc4random()");
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145 #elif defined(WITH_OPENSSL)
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146 lua_pushstring(L, "OpenSSL");
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147 #endif
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148 lua_setfield(L, -2, "_source");
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149
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150 #if defined(WITH_OPENSSL) && defined(_WIN32)
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151 /* Do we need to seed this on Windows? */
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152 #endif
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153
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154 return 1;
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155 }
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156