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/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nixio-tls.h"
#include <string.h>
static SSL_CTX* nixio__checktlsctx(lua_State *L) {
SSL_CTX **ctx = (SSL_CTX **)luaL_checkudata(L, 1, NIXIO_TLS_CTX_META);
luaL_argcheck(L, *ctx, 1, "invalid context");
return *ctx;
}
static int nixio__tls_perror(lua_State *L, int code) {
lua_pushnil(L);
lua_pushinteger(L, code);
return 2;
}
static int nixio__tls_pstatus(lua_State *L, int code) {
if (code == 1) {
lua_pushboolean(L, 1);
return 1;
} else {
return nixio__tls_perror(L, code);
}
}
static int nixio_tls_ctx(lua_State * L) {
const char *method = luaL_optlstring(L, 1, "tlsv1", NULL);
SSL_CTX **ctx = lua_newuserdata(L, sizeof(SSL_CTX *));
if (!ctx) {
return luaL_error(L, "out of memory");
}
/* create userdata */
luaL_getmetatable(L, NIXIO_TLS_CTX_META);
lua_setmetatable(L, -2);
if (!strcmp(method, "tlsv1")) {
*ctx = SSL_CTX_new(TLSv1_method());
} else if (!strcmp(method, "sslv23")) {
*ctx = SSL_CTX_new(SSLv23_method());
} else {
return luaL_argerror(L, 1, "supported values: tlsv1, sslv23");
}
SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
if (!(*ctx)) {
return luaL_error(L, "unable to create TLS context");
}
return 1;
}
static int nixio_tls_ctx_create(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
int fd = nixio__checkfd(L, 2);
lua_createtable(L, 0, 3);
nixio_tls_sock *sock = lua_newuserdata(L, sizeof(nixio_tls_sock));
if (!sock) {
return luaL_error(L, "out of memory");
}
memset(sock, 0, sizeof(nixio_tls_sock));
/* create userdata */
luaL_getmetatable(L, NIXIO_TLS_SOCK_META);
lua_pushvalue(L, -1);
lua_setmetatable(L, -3);
sock->socket = SSL_new(ctx);
if (!sock->socket) {
return nixio__tls_perror(L, 0);
}
if (SSL_set_fd(sock->socket, fd) != 1) {
return nixio__tls_perror(L, 0);
}
/* save context and socket to prevent GC from collecting them */
lua_setmetatable(L, -3);
lua_setfield(L, -2, "connection");
lua_pushvalue(L, 1);
lua_setfield(L, -2, "context");
lua_pushvalue(L, 2);
lua_setfield(L, -2, "socket");
return 1;
}
static int nixio_tls_ctx_set_cert(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
const char *cert = luaL_checkstring(L, 2);
return nixio__tls_pstatus(L, SSL_CTX_use_certificate_chain_file(ctx, cert));
}
static int nixio_tls_ctx_set_key(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
const char *cert = luaL_checkstring(L, 2);
const int ktype = SSL_FILETYPE_PEM;
return nixio__tls_pstatus(L, SSL_CTX_use_PrivateKey_file(ctx, cert, ktype));
}
static int nixio_tls_ctx_set_ciphers(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
size_t len;
const char *ciphers = luaL_checklstring(L, 2, &len);
luaL_argcheck(L, len < 255, 2, "cipher string too long");
return nixio__tls_pstatus(L, SSL_CTX_set_cipher_list(ctx, ciphers));
}
static int nixio_tls_ctx_set_verify_depth(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
const int depth = luaL_checkinteger(L, 2);
SSL_CTX_set_verify_depth(ctx, depth);
return 0;
}
static int nixio_tls_ctx_set_verify(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
const int j = lua_gettop(L);
int flags = 0;
for (int i=2; i<=j; i++) {
const char *flag = luaL_checkstring(L, i);
if (!strcmp(flag, "none")) {
flags |= SSL_VERIFY_NONE;
} else if (!strcmp(flag, "peer")) {
flags |= SSL_VERIFY_PEER;
} else if (!strcmp(flag, "verify_fail_if_no_peer_cert")) {
flags |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
} else if (!strcmp(flag, "client_once")) {
flags |= SSL_VERIFY_CLIENT_ONCE;
} else {
return luaL_argerror(L, i, "supported values: none, peer, "
"verify_fail_if_no_peer_cert, client_once");
}
}
SSL_CTX_set_verify(ctx, flags, NULL);
return 0;
}
static int nixio_tls_ctx__gc(lua_State *L) {
SSL_CTX **ctx = (SSL_CTX **)luaL_checkudata(L, 1, NIXIO_TLS_CTX_META);
if (*ctx) {
SSL_CTX_free(*ctx);
*ctx = NULL;
}
return 0;
}
static int nixio_tls_ctx__tostring(lua_State *L) {
SSL_CTX *ctx = nixio__checktlsctx(L);
lua_pushfstring(L, "nixio TLS context: %p", ctx);
return 1;
}
/* module table */
static const luaL_reg R[] = {
{"tls", nixio_tls_ctx},
{NULL, NULL}
};
/* ctx function table */
static const luaL_reg CTX_M[] = {
{"set_cert", nixio_tls_ctx_set_cert},
{"set_key", nixio_tls_ctx_set_key},
{"set_ciphers", nixio_tls_ctx_set_ciphers},
{"set_verify_depth", nixio_tls_ctx_set_verify_depth},
{"set_verify", nixio_tls_ctx_set_verify},
{"create", nixio_tls_ctx_create},
{"__gc", nixio_tls_ctx__gc},
{"__tostring", nixio_tls_ctx__tostring},
{NULL, NULL}
};
void nixio_open_tls_context(lua_State *L) {
/* initialize tls library */
SSL_load_error_strings();
SSL_library_init();
/* register module functions */
luaL_register(L, NULL, R);
/* create context metatable */
luaL_newmetatable(L, NIXIO_TLS_CTX_META);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
luaL_register(L, NULL, CTX_M);
lua_pop(L, 1);
}
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