Some work with OCSP

samples/ocsp/client.lua

@@ -0,0 +1,54 @@
+--
+-- Public domain
+--
+local socket = require("socket")
+local ssl    = require("ssl")
+
+local ocsp   = ssl.ocsp
+
+-- Parameters
+--   * status:
+--     * nil                          (no status was sent by server)
+--     * ocsp.status.successful
+--     * ocsp.status.malformedrequest
+--     * ocsp.status.internalerror
+--     * ocsp.status.trylater
+--     * ocsp.status.sigrequired
+--     * ocsp.status.unauthorized
+--
+-- Returns
+--   * nil: on error
+--   * true: status was accepted (continue the handshake)
+--   * false: status not accepted (handshake stops with error)
+--
+local callback = function(status)
+  print("Status: ", status)
+  print("---")
+
+  if status == nil then
+    print("[WARN] No OCSP response")
+    return true
+  end
+
+  return (status == ocsp.status.successful)
+end
+
+local params = {
+   mode     = "client",
+   protocol = "tlsv1_2",
+   verify   = "none",
+   options  = "all",
+   ocsp     = callback,
+}
+
+while true do
+  local peer = socket.tcp()
+  peer:connect("127.0.0.1", 8443)
+  
+  peer = assert(ssl.wrap(peer, params))
+  assert(peer:dohandshake())
+  
+  print(peer:receive())
+  print("------------")
+  peer:close()
+end

samples/ocsp/server.lua

@@ -0,0 +1,89 @@
+--
+-- Public domain
+--
+local socket = require("socket")
+local ssl    = require("ssl")
+
+local mime   = require("mime")
+local ltn12  = require("ltn12")
+local http   = require("socket.http")
+
+local ocsp   = ssl.ocsp
+
+--------------------------------------------------------------------------------
+
+local response
+
+function loadresponse(certfile, cafile)
+  local f = io.open(cafile)
+  local ca = f:read("*a")
+  ca = ssl.loadcertificate(ca)
+  f:close()
+ 
+  f = io.open(certfile)
+  local cert = f:read("*a")
+  cert = ssl.loadcertificate(cert)
+  f:close()
+ 
+  local res = {}
+  local req = ocsp.buildrequest(cert, ca)
+  req = mime.b64(req)
+ 
+  local a, b = http.request {
+    url = "http://zerossl.ocsp.sectigo.com/" .. req,
+    method = "GET",
+    sink = ltn12.sink.table(res),
+    header = {
+      ["Content-Type"] = "application/ocsp-request",
+      ["Host"] = "zerossl.ocsp.sectigo.com",
+    },
+  }
+ 
+  response = table.concat(res)
+
+  local thisupd, nextupd = ocsp.responsetime(response)
+  print("This update: ", thisupd)
+  print("Next update: ", nextupd)
+end
+
+--------------------------------------------------------------------------------
+
+local cafile = "ca.pem"
+local certfile = "server.pem"
+
+-- Remember to update 'response' before 'next update'
+local callback = function()
+  if not response then
+    loadresponse(certfile, cafile)
+  end
+  return response
+end
+
+local params = {
+   mode = "server",
+   protocol = "any",
+   key = "server.key",
+   certificate = certfile,
+   verify = "none",
+   options = "all",
+   ocsp = callback,
+}
+
+--------------------------------------------------------------------------------
+
+local ctx = assert(ssl.newcontext(params))
+
+local server = socket.tcp()
+server:setoption('reuseaddr', true)
+assert(server:bind("127.0.0.1", 8443))
+server:listen()
+
+while true do
+  local peer = server:accept()
+  peer = assert(ssl.wrap(peer, ctx))
+  local succ = peer:dohandshake()
+  if succ then
+    peer:send("OCSP test\n")
+    peer:close()
+  end
+end

src/config.c

@@ -81,6 +81,13 @@ LSEC_API int luaopen_ssl_config(lua_State *L)
   lua_rawset(L, -3);
 #endif
 
+#ifndef OPENSSL_NO_OCSP
+  // OCSP
+  lua_pushstring(L, "ocsp");
+  lua_pushboolean(L, 1);
+  lua_rawset(L, -3);
+#endif
+
 #ifndef OPENSSL_NO_EC
   lua_pushstring(L, "curves_list");
   lua_pushboolean(L, 1);

src/context.c

@@ -19,12 +19,17 @@
 #include <openssl/x509v3.h>
 #include <openssl/dh.h>
 
+#ifndef OPENSSL_NO_OCSP
+#include <openssl/ocsp.h>
+#endif
+
 #include <lua.h>
 #include <lauxlib.h>
 
 #include "compat.h"
 #include "context.h"
 #include "options.h"
+#include "x509.h"
 
 #ifndef OPENSSL_NO_EC
 #include <openssl/ec.h>
@@ -707,6 +712,196 @@ static int set_alpn_cb(lua_State *L)
   return 1;
 }
 
+#ifndef OPENSSL_NO_OCSP
+static int ocsp_server_cb(SSL *ssl, void *arg)
+{
+  int len;
+  BIO *bio;
+  const char *data;
+  unsigned char *r = NULL;
+  OCSP_RESPONSE *resp = NULL;
+  p_context ctx = (p_context)arg;
+  lua_State *L = ctx->L;
+
+  // Retrieve the callback
+  luaL_getmetatable(L, "SSL:OCSP:Registry");
+  lua_pushlightuserdata(L, ctx->context);
+  lua_rawget(L, -2);
+
+  lua_call(L, 0, 1);
+  if (lua_type(L, -1) != LUA_TSTRING) {
+    return SSL_TLSEXT_ERR_NOACK;
+  }
+
+  data = lua_tostring(L, -1);
+  len  = (int)lua_rawlen(L, -1);
+
+  bio = BIO_new_mem_buf(data, len);
+  if (bio == NULL)
+    return SSL_TLSEXT_ERR_NOACK;
+
+  resp = d2i_OCSP_RESPONSE_bio(bio, NULL);
+  BIO_free(bio);
+  if (resp == NULL)
+    return SSL_TLSEXT_ERR_NOACK;
+
+  len = i2d_OCSP_RESPONSE(resp, &r);
+  if (len <= 0) {
+    OCSP_RESPONSE_free(resp);
+    return SSL_TLSEXT_ERR_NOACK;
+  }
+
+  SSL_set_tlsext_status_ocsp_resp(ssl, r, len);
+  OCSP_RESPONSE_free(resp);
+  return SSL_TLSEXT_ERR_OK;
+}
+
+static int ocsp_client_cb(SSL *ssl, void *arg)
+{
+  long len;
+  const unsigned char *b;
+  OCSP_RESPONSE *ocsp = NULL;
+  p_context ctx = (p_context)arg;
+  lua_State *L = ctx->L;
+
+  // Retrieve the callback
+  luaL_getmetatable(L, "SSL:OCSP:Registry");
+  lua_pushlightuserdata(L, ctx->context);
+  lua_rawget(L, -2);
+
+  len = SSL_get_tlsext_status_ocsp_resp(ssl, &b);
+  if (len == -1)
+    lua_pushnil(L);
+  else {
+    ocsp = d2i_OCSP_RESPONSE(NULL, &b, len);
+    lua_pushinteger(L, OCSP_response_status(ocsp));
+    OCSP_RESPONSE_free(ocsp);
+  }
+
+  lua_call(L, 1, 1);
+  return (lua_type(L, -1) != LUA_TBOOLEAN) ? -1 : (int)lua_toboolean(L, -1);
+}
+
+static int set_ocsp_cb(lua_State *L)
+{
+  int ret;
+  p_context ctx = checkctx(L, 1);
+
+  luaL_getmetatable(L, "SSL:OCSP:Registry");
+  lua_pushlightuserdata(L, (void*)ctx->context);
+  lua_pushvalue(L, 2);
+  lua_settable(L, -3);
+
+  ret = (int)SSL_CTX_set_tlsext_status_type(ctx->context, TLSEXT_STATUSTYPE_ocsp);
+  if (ret == 0) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  if (ctx->mode == LSEC_MODE_CLIENT)
+    ret = (int)SSL_CTX_set_tlsext_status_cb(ctx->context, ocsp_client_cb);
+  else
+    ret = (int)SSL_CTX_set_tlsext_status_cb(ctx->context, ocsp_server_cb);
+
+  if (ret == 0) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  ret = (int)SSL_CTX_set_tlsext_status_arg(ctx->context, ctx);
+  lua_pushboolean(L, ret == 1);
+  return 1;
+}
+
+static int ocsp_build_request(lua_State *L)
+{
+  long len;
+  BIO *bio;
+  X509 *cert;
+  X509 *issuer;
+  OCSP_CERTID *cid;
+  OCSP_REQUEST *req;
+  char *buf;
+
+  cert = lsec_checkx509(L, 1);
+  issuer = lsec_checkx509(L, 2);
+
+  req = OCSP_REQUEST_new();
+  if (req == NULL) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  cid = OCSP_cert_to_id(NULL, cert, issuer);
+  if (cid == NULL) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  if (OCSP_request_add0_id(req, cid) == NULL) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  bio = BIO_new(BIO_s_mem());
+  i2d_OCSP_REQUEST_bio(bio, req);
+  len = BIO_get_mem_data(bio, &buf);
+  lua_pushlstring(L, buf, len);
+
+  BIO_free(bio);
+  OCSP_REQUEST_free(req);
+
+  return 1;
+}
+
+static int ocsp_response_time(lua_State *L)
+{
+  long len;
+  BIO *bio;
+  char *buf;
+  int reason;
+  OCSP_BASICRESP *bs;
+  OCSP_SINGLERESP *sr;
+  OCSP_RESPONSE *res;
+  ASN1_GENERALIZEDTIME *revtime, *thisupd, *nextupd;
+
+  buf = (char*)lua_tostring(L, 1);
+  len = (long)lua_rawlen(L, 1);
+
+  res = d2i_OCSP_RESPONSE(NULL, (const unsigned char**)&buf, (int)len);
+  if (res == NULL) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  bs = OCSP_response_get1_basic(res);
+  if (bs == NULL) {
+    lua_pushboolean(L, 0);
+    return 1;
+  }
+
+  sr = OCSP_resp_get0(bs, 0);
+  OCSP_single_get0_status(sr, &reason, &revtime, &thisupd, &nextupd);
+
+  bio = BIO_new(BIO_s_mem());
+  ASN1_GENERALIZEDTIME_print(bio, thisupd);
+  len = BIO_get_mem_data(bio, &buf);
+  lua_pushlstring(L, buf, len);
+  BIO_free(bio);
+
+  bio = BIO_new(BIO_s_mem());
+  ASN1_GENERALIZEDTIME_print(bio, nextupd);
+  len = BIO_get_mem_data(bio, &buf);
+  lua_pushlstring(L, buf, len);
+  BIO_free(bio);
+
+  OCSP_BASICRESP_free(bs);
+  OCSP_RESPONSE_free(res);
+
+  return 2;
+}
+#endif
+
 #if defined(LSEC_ENABLE_DANE)
 /*
  * DANE
@@ -745,6 +940,9 @@ static luaL_Reg funcs[] = {
 #endif
 #if defined(LSEC_ENABLE_DANE)
   {"setdane",         set_dane},
+#endif
+#if !defined(OPENSSL_NO_OCSP)
+  {"setocspcb",       set_ocsp_cb},
 #endif
   {NULL, NULL}
 };
@@ -771,6 +969,10 @@ static int meth_destroy(lua_State *L)
     lua_pushlightuserdata(L, (void*)ctx->context);
     lua_pushnil(L);
     lua_settable(L, -3);
+    luaL_getmetatable(L, "SSL:OCSP:Registry");
+    lua_pushlightuserdata(L, (void*)ctx->context);
+    lua_pushnil(L);
+    lua_settable(L, -3);
 
     SSL_CTX_free(ctx->context);
     ctx->context = NULL;
@@ -908,6 +1110,55 @@ void *lsec_testudata (lua_State *L, int ud, const char *tname) {
 
 /*------------------------------ Initialization ------------------------------*/
 
+#ifndef OPENSSL_NO_OCSP
+struct ocsp_status_response_s {
+  const char *name;
+  int value;
+};
+
+typedef struct ocsp_status_response_s ocsp_status_response_t;
+
+static ocsp_status_response_t status_response[] = {
+  {"successful",       OCSP_RESPONSE_STATUS_SUCCESSFUL},
+  {"malformedrequest", OCSP_RESPONSE_STATUS_MALFORMEDREQUEST},
+  {"internalerror",    OCSP_RESPONSE_STATUS_INTERNALERROR},
+  {"trylater",         OCSP_RESPONSE_STATUS_TRYLATER},
+  {"sigrequired",      OCSP_RESPONSE_STATUS_SIGREQUIRED},
+  {"unauthorized",     OCSP_RESPONSE_STATUS_UNAUTHORIZED},
+  {NULL, 0}
+};
+
+static luaL_Reg ocsp_funcs[] = {
+  {"buildrequest", ocsp_build_request},
+  {"responsetime", ocsp_response_time},
+  {NULL, NULL}
+};
+
+
+/**
+ * OCSP module
+ */
+LSEC_API int luaopen_ssl_context_ocsp(lua_State *L)
+{
+  ocsp_status_response_t *ptr;
+
+  luaL_newlib(L, ocsp_funcs);
+
+  lua_pushstring(L, "status");
+  lua_newtable(L);
+  for (ptr = status_response; ptr->name; ptr++) {
+    lua_pushstring(L, ptr->name);
+    lua_pushinteger(L, ptr->value);
+    lua_rawset(L, -3);
+  }
+  lua_rawset(L, -3);
+
+  return 1;
+}
+#endif
+
+//------------------------------------------------------------------------------
+
 /**
  * Registre the module.
  */
@@ -916,6 +1167,7 @@ LSEC_API int luaopen_ssl_context(lua_State *L)
   luaL_newmetatable(L, "SSL:DH:Registry");      /* Keep all DH callbacks   */
   luaL_newmetatable(L, "SSL:ALPN:Registry");    /* Keep all ALPN callbacks */
   luaL_newmetatable(L, "SSL:Verify:Registry");  /* Keep all verify flags   */
+  luaL_newmetatable(L, "SSL:OCSP:Registry");    /* Keep all OCSP callbacks */
   luaL_newmetatable(L, "SSL:Context");
   setfuncs(L, meta);
 

src/ssl.lua

@@ -10,6 +10,11 @@ local context = require("ssl.context")
 local x509    = require("ssl.x509")
 local config  = require("ssl.config")
 
+local ocsp
+if config.capabilities.ocsp then
+  ocsp = require("ssl.context.ocsp")
+end
+
 local unpack  = table.unpack or unpack
 
 -- We must prevent the contexts to be collected before the connections,
@@ -205,6 +210,14 @@ local function newcontext(cfg)
       context.setdane(ctx)
    end
 
+   if config.capabilities.ocsp and cfg.ocsp then
+      msg  = "error setting OCSP"
+      succ = type(cfg.ocsp) == "function"
+      if not succ then return nil, msg end
+      succ = context.setocspcb(ctx, cfg.ocsp)
+      if not succ then return nil, msg end
+   end
+
    return ctx
 end
 
@@ -274,6 +287,7 @@ local _M = {
   _VERSION        = "1.0.1",
   _COPYRIGHT      = core.copyright(),
   config          = config,
+  ocsp            = ocsp,
   loadcertificate = x509.load,
   newcontext      = newcontext,
   wrap            = wrap,