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/*
* px5g - Embedded x509 key and certificate generator based on PolarSSL
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License, version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "px5g.h"
#include <time.h>
#include <string.h>
#define VERSION 0.1
static char *xfields[] = {"CN", "O", "C", "OU", "ST", "L", "R"};
static int px5g_genkey(lua_State *L) {
int keysize = luaL_checkint(L, 1), pexp = luaL_optint(L, 2, 65537), ret;
px5g_rsa *px5g = lua_newuserdata(L, sizeof(px5g_rsa));
if (!px5g) {
return luaL_error(L, "out of memory");
}
px5g->stat = 1;
havege_init(&px5g->hs);
rsa_init(&px5g->rsa, RSA_PKCS_V15, 0, havege_rand, &px5g->hs);
if ((ret = rsa_gen_key(&px5g->rsa, keysize, pexp))) {
lua_pushnil(L);
lua_pushinteger(L, ret);
return 2;
}
luaL_getmetatable(L, PX5G_KEY_META);
lua_setmetatable(L, -2);
return 1;
}
static int px5g_rsa_asn1(lua_State *L) {
int ret;
px5g_rsa *px5g = luaL_checkudata(L, 1, PX5G_KEY_META);
x509_node node;
x509write_init_node(&node);
if ((ret = x509write_serialize_key(&px5g->rsa, &node))) {
x509write_free_node(&node);
lua_pushnil(L);
lua_pushinteger(L, ret);
return 2;
}
lua_pushlstring(L, (char*)node.data, node.len);
x509write_free_node(&node);
return 1;
}
static int px5g_rsa_create_selfsigned(lua_State *L) {
px5g_rsa *px5g = luaL_checkudata(L, 1, PX5G_KEY_META);
luaL_checktype(L, 2, LUA_TTABLE);
time_t from = (time_t)luaL_checknumber(L, 3);
time_t to = (time_t)luaL_checknumber(L, 4);
char fstr[20], tstr[20];
lua_pushliteral(L, "CN");
lua_rawget(L, 2);
luaL_argcheck(L, lua_isstring(L, -1), 2, "CN missing");
lua_pop(L, 1);
luaL_argcheck(L,
strftime(fstr, sizeof(fstr), "%F %H:%M:%S", gmtime(&from)),
3, "Invalid Time");
luaL_argcheck(L,
strftime(tstr, sizeof(tstr), "%F %H:%M:%S", gmtime(&to)),
4, "Invalid Time");
lua_pushliteral(L, "");
for (int i = 0; i < (sizeof(xfields) / sizeof(*xfields)); i++) {
lua_pushstring(L, xfields[i]);
lua_rawget(L, 2);
if (lua_isstring(L, -1)) {
const char *val = lua_tostring(L, -1);
luaL_argcheck(L, !strchr(val, '\''), 2, "Invalid Value");
lua_pushfstring(L, "%s%s='%s';",
lua_tostring(L, -2), xfields[i], val);
lua_remove(L, -2);
lua_remove(L, -2);
} else {
lua_pop(L, 1);
}
}
x509_raw cert;
x509write_init_raw(&cert);
x509write_add_pubkey(&cert, &px5g->rsa);
x509write_add_subject(&cert, (unsigned char*)lua_tostring(L, -1));
x509write_add_validity(&cert, (unsigned char*)fstr, (unsigned char*)tstr);
x509write_create_selfsign(&cert, &px5g->rsa);
lua_pushlstring(L, (char*)cert.raw.data, cert.raw.len);
x509write_free_raw(&cert);
return 1;
}
static int px5g_rsa__gc(lua_State *L) {
px5g_rsa *px5g = luaL_checkudata(L, 1, PX5G_KEY_META);
if (px5g->stat) {
rsa_free(&px5g->rsa);
px5g->stat = 0;
}
return 0;
}
static int px5g_rsa__tostring(lua_State *L) {
px5g_rsa *px5g = luaL_checkudata(L, 1, PX5G_KEY_META);
lua_pushfstring(L, "px5g context %p", px5g);
return 1;
}
/* method table */
static const luaL_reg M[] = {
{"asn1", px5g_rsa_asn1},
{"create_selfsigned", px5g_rsa_create_selfsigned},
{"__gc", px5g_rsa__gc},
{"__tostring", px5g_rsa__tostring},
{NULL, NULL}
};
/* module table */
static const luaL_reg R[] = {
{"genkey", px5g_genkey},
{NULL, NULL}
};
int luaopen_px5g(lua_State *L) {
/* register module */
luaL_register(L, "px5g", R);
/* Meta Table */
luaL_newmetatable(L, PX5G_KEY_META);
luaL_register(L, NULL, M);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_setfield(L, -2, "meta_key");
return 1;
}
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