2 * nixio - Linux I/O library for lua
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
19 #include "nixio-tls.h"
22 static SSL_CTX* nixio__checktlsctx(lua_State *L) {
23 SSL_CTX **ctx = (SSL_CTX **)luaL_checkudata(L, 1, NIXIO_TLS_CTX_META);
24 luaL_argcheck(L, *ctx, 1, "invalid context");
28 static int nixio__tls_perror(lua_State *L, int code) {
30 lua_pushinteger(L, code);
34 static int nixio__tls_pstatus(lua_State *L, int code) {
36 lua_pushboolean(L, 1);
39 return nixio__tls_perror(L, code);
43 static int nixio_tls_ctx(lua_State * L) {
44 const char *method = luaL_optlstring(L, 1, "client", NULL);
46 luaL_getmetatable(L, NIXIO_TLS_CTX_META);
47 SSL_CTX **ctx = lua_newuserdata(L, sizeof(SSL_CTX *));
49 return luaL_error(L, "out of memory");
54 lua_setmetatable(L, -2);
56 if (!strcmp(method, "client")) {
57 *ctx = SSL_CTX_new(TLSv1_client_method());
58 } else if (!strcmp(method, "server")) {
59 *ctx = SSL_CTX_new(TLSv1_server_method());
61 return luaL_argerror(L, 1, "supported values: client, server");
65 return luaL_error(L, "unable to create TLS context");
69 SSL_CTX_set_verify(*ctx, SSL_VERIFY_NONE, NULL);
75 static int nixio_tls_ctx_create(lua_State *L) {
76 SSL_CTX *ctx = nixio__checktlsctx(L);
77 int fd = nixio__checkfd(L, 2);
79 lua_createtable(L, 0, 3);
80 nixio_tls_sock *sock = lua_newuserdata(L, sizeof(nixio_tls_sock));
82 return luaL_error(L, "out of memory");
84 memset(sock, 0, sizeof(nixio_tls_sock));
87 luaL_getmetatable(L, NIXIO_TLS_SOCK_META);
89 lua_setmetatable(L, -3);
91 sock->socket = SSL_new(ctx);
93 return nixio__tls_perror(L, 0);
96 if (SSL_set_fd(sock->socket, fd) != 1) {
97 return nixio__tls_perror(L, 0);
100 /* save context and socket to prevent GC from collecting them */
101 lua_setmetatable(L, -3);
102 lua_setfield(L, -2, "connection");
105 lua_setfield(L, -2, "context");
108 lua_setfield(L, -2, "socket");
113 static int nixio_tls_ctx_set_cert(lua_State *L) {
114 SSL_CTX *ctx = nixio__checktlsctx(L);
115 const char *cert = luaL_checkstring(L, 2);
116 const char *type = luaL_optstring(L, 3, "chain");
119 if (!strcmp(type, "chain")) {
120 return nixio__tls_pstatus(L,
121 SSL_CTX_use_certificate_chain_file(ctx, cert));
122 } else if (!strcmp(type, "pem")) {
123 ktype = SSL_FILETYPE_PEM;
124 } else if (!strcmp(type, "asn1")) {
125 ktype = SSL_FILETYPE_ASN1;
127 return luaL_argerror(L, 3, "supported values: chain, pem, asn1");
130 return nixio__tls_pstatus(L,
131 SSL_CTX_use_certificate_file(ctx, cert, ktype));
134 static int nixio_tls_ctx_set_verify_locations(lua_State *L) {
135 SSL_CTX *ctx = nixio__checktlsctx(L);
136 const char *CAfile = luaL_optstring(L, 2, NULL);
137 const char *CApath = luaL_optstring(L, 3, NULL);
138 return nixio__tls_pstatus(L, SSL_CTX_load_verify_locations(ctx,
142 static int nixio_tls_ctx_set_key(lua_State *L) {
143 SSL_CTX *ctx = nixio__checktlsctx(L);
144 const char *cert = luaL_checkstring(L, 2);
145 const char *type = luaL_optstring(L, 3, "pem");
148 if (!strcmp(type, "pem")) {
149 ktype = SSL_FILETYPE_PEM;
150 } else if (!strcmp(type, "asn1")) {
151 ktype = SSL_FILETYPE_ASN1;
153 return luaL_argerror(L, 3, "supported values: pem, asn1");
156 return nixio__tls_pstatus(L, SSL_CTX_use_PrivateKey_file(ctx, cert, ktype));
159 static int nixio_tls_ctx_set_ciphers(lua_State *L) {
160 SSL_CTX *ctx = nixio__checktlsctx(L);
162 const char *ciphers = luaL_checklstring(L, 2, &len);
163 luaL_argcheck(L, len < 255, 2, "cipher string too long");
164 return nixio__tls_pstatus(L, SSL_CTX_set_cipher_list(ctx, ciphers));
167 static int nixio_tls_ctx_set_verify(lua_State *L) {
168 SSL_CTX *ctx = nixio__checktlsctx(L);
169 const int j = lua_gettop(L);
171 for (int i=2; i<=j; i++) {
172 const char *flag = luaL_checkstring(L, i);
173 if (!strcmp(flag, "none")) {
174 flags |= SSL_VERIFY_NONE;
175 } else if (!strcmp(flag, "peer")) {
176 flags |= SSL_VERIFY_PEER;
177 } else if (!strcmp(flag, "verify_fail_if_no_peer_cert")) {
178 flags |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
179 } else if (!strcmp(flag, "client_once")) {
180 flags |= SSL_VERIFY_CLIENT_ONCE;
182 return luaL_argerror(L, i, "supported values: none, peer, "
183 "verify_fail_if_no_peer_cert, client_once");
186 SSL_CTX_set_verify(ctx, flags, NULL);
190 static int nixio_tls_ctx__gc(lua_State *L) {
191 SSL_CTX **ctx = (SSL_CTX **)luaL_checkudata(L, 1, NIXIO_TLS_CTX_META);
199 static int nixio_tls_ctx__tostring(lua_State *L) {
200 SSL_CTX *ctx = nixio__checktlsctx(L);
201 lua_pushfstring(L, "nixio TLS context: %p", ctx);
206 static const luaL_reg R[] = {
207 {"tls", nixio_tls_ctx},
211 /* ctx function table */
212 static const luaL_reg CTX_M[] = {
213 {"set_cert", nixio_tls_ctx_set_cert},
214 {"set_verify_locations", nixio_tls_ctx_set_verify_locations},
215 {"set_key", nixio_tls_ctx_set_key},
216 {"set_ciphers", nixio_tls_ctx_set_ciphers},
217 {"set_verify", nixio_tls_ctx_set_verify},
218 {"create", nixio_tls_ctx_create},
219 {"__gc", nixio_tls_ctx__gc},
220 {"__tostring", nixio_tls_ctx__tostring},
225 void nixio_open_tls_context(lua_State *L) {
226 /* initialize tls library */
227 SSL_load_error_strings();
230 /* register module functions */
231 luaL_register(L, NULL, R);
233 #if defined (WITH_AXTLS)
234 lua_pushliteral(L, "axtls");
235 #elif defined (WITH_CYASSL)
236 lua_pushliteral(L, "cyassl");
238 lua_pushliteral(L, "openssl");
240 lua_setfield(L, -2, "tls_provider");
242 /* create context metatable */
243 luaL_newmetatable(L, NIXIO_TLS_CTX_META);
244 lua_pushvalue(L, -1);
245 lua_setfield(L, -2, "__index");
246 luaL_register(L, NULL, CTX_M);
247 lua_setfield(L, -2, "meta_tls_context");