author | Kim Alvefur <zash@zash.se> |
Sun, 22 Jan 2017 09:55:44 +0100 | |
changeset 7834 | 201d0df6cce9 |
parent 7833 | b9910a507250 |
child 7835 | d02ef0ae94af |
permissions | -rw-r--r-- |
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/* 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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/* |
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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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#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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#include <unistd.h> |
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#include <sys/syscall.h> |
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#include <linux/random.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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/* |
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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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int getrandom(void *buf, size_t len, int flags) { |
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return syscall(SYS_getrandom, buf, len, flags); |
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} |
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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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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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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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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_newtable(L); |
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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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#if defined(WITH_OPENSSL) && defined(_WIN32) |
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/* Do we need to seed this on Windows? */ |
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#endif |
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105 |
|
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106 |
return 1; |
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107 |
} |
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parents:
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108 |