prosody
e1d274001855
util-src/crand.c

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util-src/crand.c @ 8509:e1d274001855

Backed out changeset 89c42aff8510: The problem in ejabberd has reportedly been resolved and this change causes more problems than it solves (fixes #1006)
author Kim Alvefur <zash@zash.se>
date Sun, 04 Feb 2018 01:13:27 +0100
parent 8127:3e443d6791e6
child 8422:6eecf82ccd8e
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 "lualib.h"
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25 #include "lauxlib.h"
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27 #include <string.h>
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28 #include <errno.h>
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30 #if defined(WITH_GETRANDOM)
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31
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32 #ifndef __GLIBC_PREREQ
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33 #define __GLIBC_PREREQ(a,b) 0
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34 #endif
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35
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36 #if ! __GLIBC_PREREQ(2,25)
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37 #include <unistd.h>
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38 #include <sys/syscall.h>
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39
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40 #ifndef SYS_getrandom
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41 #error getrandom() requires Linux 3.17 or later
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42 #endif
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43
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44 /* This wasn't present before glibc 2.25 */
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45 int getrandom(void *buf, size_t buflen, unsigned int flags) {
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46 return syscall(SYS_getrandom, buf, buflen, flags);
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47 }
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48 #else
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49 #include <sys/random.h>
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50 #endif
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51
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52 #elif defined(WITH_ARC4RANDOM)
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53 #include <stdlib.h>
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54 #elif defined(WITH_OPENSSL)
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55 #include <openssl/rand.h>
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56 #else
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57 #error util.crand compiled without a random source
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58 #endif
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59
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60 int Lrandom(lua_State *L) {
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61 int ret = 0;
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62 size_t len = (size_t)luaL_checkinteger(L, 1);
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63 void *buf = lua_newuserdata(L, len);
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64
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65 #if defined(WITH_GETRANDOM)
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66 /*
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67 * This acts like a read from /dev/urandom with the exception that it
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68 * *does* block if the entropy pool is not yet initialized.
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69 */
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70 ret = getrandom(buf, len, 0);
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71
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72 if(ret < 0) {
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73 lua_pushstring(L, strerror(errno));
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74 return lua_error(L);
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75 }
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76
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77 #elif defined(WITH_ARC4RANDOM)
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78 arc4random_buf(buf, len);
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79 ret = len;
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80 #elif defined(WITH_OPENSSL)
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81 if(!RAND_status()) {
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82 lua_pushliteral(L, "OpenSSL PRNG not seeded");
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83 return lua_error(L);
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84 }
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85
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86 ret = RAND_bytes(buf, len);
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87
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88 if(ret == 1) {
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89 ret = len;
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90 } else {
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91 /* TODO ERR_get_error() */
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92 lua_pushstring(L, "RAND_bytes() failed");
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93 return lua_error(L);
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94 }
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96 #endif
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97
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98 lua_pushlstring(L, buf, ret);
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99 return 1;
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100 }
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101
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102 int luaopen_util_crand(lua_State *L) {
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103 #if (LUA_VERSION_NUM > 501)
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104 luaL_checkversion(L);
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105 #endif
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106
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107 lua_createtable(L, 0, 2);
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108 lua_pushcfunction(L, Lrandom);
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109 lua_setfield(L, -2, "bytes");
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110
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111 #if defined(WITH_GETRANDOM)
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112 lua_pushstring(L, "Linux");
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113 #elif defined(WITH_ARC4RANDOM)
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114 lua_pushstring(L, "arc4random()");
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115 #elif defined(WITH_OPENSSL)
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116 lua_pushstring(L, "OpenSSL");
3d2c2f0809ee util.crand: C binding to one of OpenSSL, Linux getrandom() or OpenBSD arc4random() CSPRNG
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parents:
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117 #endif
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118 lua_setfield(L, -2, "_source");
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119
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120 return 1;
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121 }
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122