prosody
06453c564141
util-src/crand.c

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util-src/crand.c @ 13014:06453c564141

util.startup: Add prosody.started promise to easily execute code after startup To avoid a race where server-started fires before the promise function body is run (on next tick), I moved server-started to fire on the next tick, which seems sensible anyway. Errors are logged, I'm not sure if we ought to be doing something more here. I'm sure we'll find out.
author Matthew Wild <mwild1@gmail.com>
date Sat, 01 Apr 2023 11:56:38 +0100
parent 12976:a187600ec7d6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Prosody IM
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2 -- Copyright (C) 2008-2017 Matthew Wild
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3 -- Copyright (C) 2008-2017 Waqas Hussain
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4 -- Copyright (C) 2016-2017 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 * The purpose of this module is to provide access to a PRNG in
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16 * environments without /dev/urandom
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17 *
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18 * Caution! This has not been extensively tested.
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19 *
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20 */
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21
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22 #define _DEFAULT_SOURCE
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23
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24 #include <stdlib.h>
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25 #include <string.h>
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26 #include <errno.h>
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27
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28 #include "lualib.h"
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29 #include "lauxlib.h"
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31 #if defined(WITH_GETRANDOM)
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32
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33 #ifndef __GLIBC_PREREQ
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34 /* Not compiled with glibc at all */
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35 #define __GLIBC_PREREQ(a,b) 0
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36 #endif
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37
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38 #if ! __GLIBC_PREREQ(2,25)
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39 /* Not compiled with a glibc that provides getrandom() */
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40 #include <unistd.h>
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41 #include <sys/syscall.h>
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42
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43 #ifndef SYS_getrandom
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44 #error getrandom() requires Linux 3.17 or later
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45 #endif
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46
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47 /* This wasn't present before glibc 2.25 */
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48 static int getrandom(void *buf, size_t buflen, unsigned int flags) {
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49 return syscall(SYS_getrandom, buf, buflen, flags);
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50 }
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51 #else
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52 #include <sys/random.h>
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53 #endif
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55 #elif defined(WITH_OPENSSL)
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56 #include <openssl/rand.h>
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57 #elif defined(WITH_ARC4RANDOM)
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58 #ifdef __linux__
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59 #include <bsd/stdlib.h>
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60 #endif
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61 #else
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62 #error util.crand compiled without a random source
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63 #endif
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64
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65 #ifndef SMALLBUFSIZ
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66 #define SMALLBUFSIZ 32
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67 #endif
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68
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69 static int Lrandom(lua_State *L) {
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70 char smallbuf[SMALLBUFSIZ];
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71 char *buf = &smallbuf[0];
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72 const lua_Integer l = luaL_checkinteger(L, 1);
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73 const size_t len = l;
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74 luaL_argcheck(L, l >= 0, 1, "must be > 0");
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75
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76 if(len == 0) {
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77 lua_pushliteral(L, "");
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78 return 1;
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79 }
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80
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81 if(len > SMALLBUFSIZ) {
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82 buf = lua_newuserdata(L, len);
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83 }
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84
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85 #if defined(WITH_GETRANDOM)
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86 /*
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87 * This acts like a read from /dev/urandom with the exception that it
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88 * *does* block if the entropy pool is not yet initialized.
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89 */
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90 int left = len;
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91 char *p = buf;
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92
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93 do {
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94 int ret = getrandom(p, left, 0);
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95
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96 if(ret < 0) {
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97 lua_pushstring(L, strerror(errno));
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98 return lua_error(L);
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99 }
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100
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101 p += ret;
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102 left -= ret;
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103 } while(left > 0);
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104
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105 #elif defined(WITH_ARC4RANDOM)
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106 arc4random_buf(buf, len);
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107 #elif defined(WITH_OPENSSL)
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108
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109 if(!RAND_status()) {
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110 lua_pushliteral(L, "OpenSSL PRNG not seeded");
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111 return lua_error(L);
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112 }
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113
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114 if(RAND_bytes((unsigned char *)buf, len) != 1) {
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115 /* TODO ERR_get_error() */
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116 lua_pushstring(L, "RAND_bytes() failed");
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117 return lua_error(L);
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118 }
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120 #endif
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121
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122 lua_pushlstring(L, buf, len);
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123 return 1;
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124 }
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125
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126 int luaopen_prosody_util_crand(lua_State *L) {
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127 luaL_checkversion(L);
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128
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129 lua_createtable(L, 0, 2);
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130 lua_pushcfunction(L, Lrandom);
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131 lua_setfield(L, -2, "bytes");
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132
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133 #if defined(WITH_GETRANDOM)
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134 lua_pushstring(L, "Linux");
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135 #elif defined(WITH_ARC4RANDOM)
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136 lua_pushstring(L, "arc4random()");
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137 #elif defined(WITH_OPENSSL)
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138 lua_pushstring(L, "OpenSSL");
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139 #endif
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140 lua_setfield(L, -2, "_source");
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141
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142 return 1;
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143 }
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144
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145 int luaopen_util_crand(lua_State *L) {
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146 return luaopen_prosody_util_crand(L);
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147 }