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122 lines
2.4 KiB
122 lines
2.4 KiB
/* Prosody IM
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-- Copyright (C) 2008-2017 Matthew Wild
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-- Copyright (C) 2008-2017 Waqas Hussain
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-- Copyright (C) 2016-2017 Kim Alvefur
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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*/
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/*
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* crand.c
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* C PRNG interface
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*
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* The purpose of this module is to provide access to a PRNG in
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* environments without /dev/urandom
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*
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* Caution! This has not been extensively tested.
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*
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*/
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#define _DEFAULT_SOURCE
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#include "lualib.h"
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#include "lauxlib.h"
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#include <string.h>
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#include <errno.h>
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#if defined(WITH_GETRANDOM)
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#ifndef __GLIBC_PREREQ
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#define __GLIBC_PREREQ(a,b) 0
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#endif
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#if ! __GLIBC_PREREQ(2,25)
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#include <unistd.h>
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#include <sys/syscall.h>
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#ifndef SYS_getrandom
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#error getrandom() requires Linux 3.17 or later
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#endif
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/* This wasn't present before glibc 2.25 */
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int getrandom(void *buf, size_t buflen, unsigned int flags) {
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return syscall(SYS_getrandom, buf, buflen, flags);
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}
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#else
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#include <sys/random.h>
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#endif
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#elif defined(WITH_ARC4RANDOM)
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#include <stdlib.h>
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#elif defined(WITH_OPENSSL)
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#include <openssl/rand.h>
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#else
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#error util.crand compiled without a random source
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#endif
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int Lrandom(lua_State *L) {
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int ret = 0;
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size_t len = (size_t)luaL_checkinteger(L, 1);
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void *buf = lua_newuserdata(L, len);
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#if defined(WITH_GETRANDOM)
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/*
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* This acts like a read from /dev/urandom with the exception that it
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* *does* block if the entropy pool is not yet initialized.
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*/
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ret = getrandom(buf, len, 0);
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if(ret < 0) {
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lua_pushstring(L, strerror(errno));
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return lua_error(L);
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}
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#elif defined(WITH_ARC4RANDOM)
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arc4random_buf(buf, len);
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ret = len;
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#elif defined(WITH_OPENSSL)
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if(!RAND_status()) {
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lua_pushliteral(L, "OpenSSL PRNG not seeded");
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return lua_error(L);
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}
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ret = RAND_bytes(buf, len);
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if(ret == 1) {
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ret = len;
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} else {
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/* TODO ERR_get_error() */
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lua_pushstring(L, "RAND_bytes() failed");
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return lua_error(L);
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}
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#endif
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lua_pushlstring(L, buf, ret);
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return 1;
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}
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int luaopen_util_crand(lua_State *L) {
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#if (LUA_VERSION_NUM > 501)
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luaL_checkversion(L);
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#endif
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lua_createtable(L, 0, 2);
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lua_pushcfunction(L, Lrandom);
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lua_setfield(L, -2, "bytes");
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#if defined(WITH_GETRANDOM)
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lua_pushstring(L, "Linux");
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#elif defined(WITH_ARC4RANDOM)
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lua_pushstring(L, "arc4random()");
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#elif defined(WITH_OPENSSL)
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lua_pushstring(L, "OpenSSL");
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#endif
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lua_setfield(L, -2, "_source");
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return 1;
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}
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