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luasandbox.c
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luasandbox.c
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <lua.h>
#include <lauxlib.h>
#include <math.h>
#include <time.h>
#include <stdlib.h>
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "zend_exceptions.h"
#include "php_luasandbox.h"
#include "luasandbox_timer.h"
#include "zend_smart_str.h"
#include "luasandbox_version.h"
#include "luasandbox_compat.h"
// Compatability typedefs and defines to hide some PHP5/PHP7 differences
typedef zend_object* object_constructor_ret_t;
typedef size_t str_param_len_t;
typedef zend_long long_param_t;
typedef zval* star_param_t;
#define compat_zend_register_internal_class_ex(ce, parent_ce) zend_register_internal_class_ex(ce, parent_ce)
#define compat_add_assoc_string(assoc, key, val) add_assoc_string((assoc), (key), (val))
#define CHECK_VALID_STATE(state) \
if (!state) { \
php_error_docref(NULL, E_WARNING, "invalid LuaSandbox state"); \
RETURN_FALSE; \
}
static PHP_GINIT_FUNCTION(luasandbox);
static PHP_GSHUTDOWN_FUNCTION(luasandbox);
static int luasandbox_post_deactivate();
static object_constructor_ret_t luasandbox_new(zend_class_entry *ce);
static lua_State * luasandbox_newstate(php_luasandbox_obj * intern);
static void luasandbox_free_storage(zend_object *object);
static object_constructor_ret_t luasandboxfunction_new(zend_class_entry *ce);
static void luasandboxfunction_free_storage(zend_object *object);
static int luasandbox_panic(lua_State * L);
static lua_State * luasandbox_state_from_zval(zval * this_ptr);
static void luasandbox_load_helper(int binary, INTERNAL_FUNCTION_PARAMETERS);
static int luasandbox_find_field(lua_State * L, int index,
char * spec, int specLength);
static void luasandbox_set_timespec(struct timespec * dest, double source);
static int luasandbox_function_init(zval * this_ptr, php_luasandboxfunction_obj ** pfunc,
lua_State ** pstate, php_luasandbox_obj ** psandbox);
static void luasandbox_function_push(php_luasandboxfunction_obj * pfunc, lua_State * pstate);
static void luasandbox_call_helper(lua_State * L, zval * sandbox_zval,
php_luasandbox_obj * sandbox,
star_param_t args, int numArgs, zval * return_value);
static void luasandbox_handle_error(php_luasandbox_obj * sandbox, int status);
static int luasandbox_dump_writer(lua_State * L, const void * p, size_t sz, void * ud);
static zend_bool luasandbox_instanceof(
zend_class_entry *child_class, zend_class_entry *parent_class);
extern char luasandbox_timeout_message[];
/** For LuaSandbox::getProfilerFunctionReport() */
enum {
LUASANDBOX_SAMPLES,
LUASANDBOX_SECONDS,
LUASANDBOX_PERCENT
};
zend_class_entry *luasandbox_ce;
zend_class_entry *luasandboxerror_ce;
zend_class_entry *luasandboxruntimeerror_ce;
zend_class_entry *luasandboxfatalerror_ce;
zend_class_entry *luasandboxsyntaxerror_ce;
zend_class_entry *luasandboxmemoryerror_ce;
zend_class_entry *luasandboxerrorerror_ce;
zend_class_entry *luasandboxtimeouterror_ce;
zend_class_entry *luasandboxemergencytimeouterror_ce;
zend_class_entry *luasandboxfunction_ce;
ZEND_DECLARE_MODULE_GLOBALS(luasandbox);
static zend_object_handlers luasandbox_object_handlers;
static zend_object_handlers luasandboxfunction_object_handlers;
/** {{{ arginfo */
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_getVersionInfo, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_luasandbox_loadString, 0, 0, 1)
ZEND_ARG_INFO(0, code)
ZEND_ARG_INFO(0, chunkName)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_luasandbox_loadBinary, 0, 0, 1)
ZEND_ARG_INFO(0, code)
ZEND_ARG_INFO(0, chunkName)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_setMemoryLimit, 0)
ZEND_ARG_INFO(0, limit)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_getMemoryUsage, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_getPeakMemoryUsage, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_setCPULimit, 0)
ZEND_ARG_INFO(0, limit)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_getCPUUsage, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_pauseUsageTimer, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_unpauseUsageTimer, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_luasandbox_enableProfiler, 0, 0, 0)
ZEND_ARG_INFO(0, period)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_disableProfiler, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_luasandbox_getProfilerFunctionReport, 0, 0, 0)
ZEND_ARG_INFO(0, units)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_luasandbox_callFunction, 0, 0, 1)
ZEND_ARG_INFO(0, name)
#ifdef ZEND_ARG_VARIADIC_INFO
ZEND_ARG_VARIADIC_INFO(0, args)
#else
ZEND_ARG_INFO(0, ...)
#endif
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_wrapPhpFunction, 0)
ZEND_ARG_INFO(0, function)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandbox_registerLibrary, 0)
ZEND_ARG_INFO(0, libname)
ZEND_ARG_INFO(0, functions)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandboxfunction___construct, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_luasandboxfunction_call, 0, 0, 0)
#ifdef ZEND_ARG_VARIADIC_INFO
ZEND_ARG_VARIADIC_INFO(0, args)
#else
ZEND_ARG_INFO(0, ...)
#endif
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_luasandboxfunction_dump, 0)
ZEND_END_ARG_INFO()
/* }}} */
/** {{{ function entries */
const zend_function_entry luasandbox_functions[] = {
ZEND_FE_END /* Must be the last line in luasandbox_functions[] */
};
const zend_function_entry luasandbox_methods[] = {
PHP_ME(LuaSandbox, getVersionInfo, arginfo_luasandbox_getVersionInfo, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
PHP_ME(LuaSandbox, loadString, arginfo_luasandbox_loadString, 0)
PHP_ME(LuaSandbox, loadBinary, arginfo_luasandbox_loadBinary, 0)
PHP_ME(LuaSandbox, setMemoryLimit, arginfo_luasandbox_setMemoryLimit, 0)
PHP_ME(LuaSandbox, getMemoryUsage, arginfo_luasandbox_getMemoryUsage, 0)
PHP_ME(LuaSandbox, getPeakMemoryUsage, arginfo_luasandbox_getPeakMemoryUsage, 0)
PHP_ME(LuaSandbox, setCPULimit, arginfo_luasandbox_setCPULimit, 0)
PHP_ME(LuaSandbox, getCPUUsage, arginfo_luasandbox_getCPUUsage, 0)
PHP_ME(LuaSandbox, pauseUsageTimer, arginfo_luasandbox_pauseUsageTimer, 0)
PHP_ME(LuaSandbox, unpauseUsageTimer, arginfo_luasandbox_unpauseUsageTimer, 0)
PHP_ME(LuaSandbox, enableProfiler, arginfo_luasandbox_enableProfiler, 0)
PHP_ME(LuaSandbox, disableProfiler, arginfo_luasandbox_disableProfiler, 0)
PHP_ME(LuaSandbox, getProfilerFunctionReport, arginfo_luasandbox_getProfilerFunctionReport, 0)
PHP_ME(LuaSandbox, callFunction, arginfo_luasandbox_callFunction, 0)
PHP_ME(LuaSandbox, wrapPhpFunction, arginfo_luasandbox_wrapPhpFunction, 0)
PHP_ME(LuaSandbox, registerLibrary, arginfo_luasandbox_registerLibrary, 0)
ZEND_FE_END
};
const zend_function_entry luasandboxfunction_methods[] = {
PHP_ME(LuaSandboxFunction, __construct, arginfo_luasandboxfunction___construct,
ZEND_ACC_PRIVATE | ZEND_ACC_FINAL)
PHP_ME(LuaSandboxFunction, call, arginfo_luasandboxfunction_call, 0)
PHP_ME(LuaSandboxFunction, dump, arginfo_luasandboxfunction_dump, 0)
ZEND_FE_END
};
const zend_function_entry luasandbox_empty_methods[] = {
ZEND_FE_END
};
/* }}} */
/* {{{ luasandbox_module_entry
*/
zend_module_entry luasandbox_module_entry = {
STANDARD_MODULE_HEADER,
"luasandbox",
luasandbox_functions,
PHP_MINIT(luasandbox),
PHP_MSHUTDOWN(luasandbox),
NULL, /* RINIT */
PHP_RSHUTDOWN(luasandbox), /* RSHUTDOWN */
PHP_MINFO(luasandbox),
LUASANDBOX_VERSION,
PHP_MODULE_GLOBALS(luasandbox),
PHP_GINIT(luasandbox),
PHP_GSHUTDOWN(luasandbox),
luasandbox_post_deactivate,
STANDARD_MODULE_PROPERTIES_EX
};
/* }}} */
/* {{{ INI Settings */
PHP_INI_BEGIN()
STD_PHP_INI_BOOLEAN("luasandbox.jit_enabled", "0", PHP_INI_ALL, OnUpdateBool, jit_enabled, zend_luasandbox_globals, luasandbox_globals)
PHP_INI_END()
/* }}} */
#ifdef COMPILE_DL_LUASANDBOX
ZEND_GET_MODULE(luasandbox)
#endif
/* {{{ PHP_MINIT_FUNCTION
*/
PHP_MINIT_FUNCTION(luasandbox)
{
REGISTER_INI_ENTRIES();
zend_class_entry ce;
INIT_CLASS_ENTRY(ce, "LuaSandbox", luasandbox_methods);
luasandbox_ce = zend_register_internal_class(&ce);
luasandbox_ce->create_object = luasandbox_new;
zend_declare_class_constant_long(luasandbox_ce,
"SAMPLES", sizeof("SAMPLES")-1, LUASANDBOX_SAMPLES);
zend_declare_class_constant_long(luasandbox_ce,
"SECONDS", sizeof("SECONDS")-1, LUASANDBOX_SECONDS);
zend_declare_class_constant_long(luasandbox_ce,
"PERCENT", sizeof("PERCENT")-1, LUASANDBOX_PERCENT);
INIT_CLASS_ENTRY(ce, "LuaSandboxError", luasandbox_empty_methods);
luasandboxerror_ce = compat_zend_register_internal_class_ex(&ce, zend_exception_get_default());
zend_declare_class_constant_long(luasandboxerror_ce,
"RUN", sizeof("RUN")-1, LUA_ERRRUN);
zend_declare_class_constant_long(luasandboxerror_ce,
"SYNTAX", sizeof("SYNTAX")-1, LUA_ERRSYNTAX);
zend_declare_class_constant_long(luasandboxerror_ce,
"MEM", sizeof("MEM")-1, LUA_ERRMEM);
zend_declare_class_constant_long(luasandboxerror_ce,
"ERR", sizeof("ERR")-1, LUA_ERRERR);
zend_declare_property_null(luasandboxerror_ce,
"luaTrace", sizeof("luaTrace")-1, ZEND_ACC_PUBLIC);
INIT_CLASS_ENTRY(ce, "LuaSandboxRuntimeError", luasandbox_empty_methods);
luasandboxruntimeerror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxerror_ce);
INIT_CLASS_ENTRY(ce, "LuaSandboxFatalError", luasandbox_empty_methods);
luasandboxfatalerror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxerror_ce);
INIT_CLASS_ENTRY(ce, "LuaSandboxSyntaxError", luasandbox_empty_methods);
luasandboxsyntaxerror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxfatalerror_ce);
INIT_CLASS_ENTRY(ce, "LuaSandboxMemoryError", luasandbox_empty_methods);
luasandboxmemoryerror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxfatalerror_ce);
INIT_CLASS_ENTRY(ce, "LuaSandboxErrorError", luasandbox_empty_methods);
luasandboxerrorerror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxfatalerror_ce);
INIT_CLASS_ENTRY(ce, "LuaSandboxTimeoutError", luasandbox_empty_methods);
luasandboxtimeouterror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxfatalerror_ce);
// Deprecated, for catch blocks only
INIT_CLASS_ENTRY(ce, "LuaSandboxEmergencyTimeoutError", luasandbox_empty_methods);
luasandboxemergencytimeouterror_ce = compat_zend_register_internal_class_ex(&ce, luasandboxfatalerror_ce);
INIT_CLASS_ENTRY(ce, "LuaSandboxFunction", luasandboxfunction_methods);
luasandboxfunction_ce = zend_register_internal_class(&ce);
luasandboxfunction_ce->create_object = luasandboxfunction_new;
memcpy(&luasandbox_object_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
luasandbox_object_handlers.offset = XtOffsetOf(php_luasandbox_obj, std);
luasandbox_object_handlers.free_obj = (zend_object_free_obj_t)luasandbox_free_storage;
memcpy(&luasandboxfunction_object_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
luasandboxfunction_object_handlers.offset = XtOffsetOf(php_luasandboxfunction_obj, std);
luasandboxfunction_object_handlers.free_obj = (zend_object_free_obj_t)luasandboxfunction_free_storage;
luasandbox_timer_minit();
return SUCCESS;
}
/* }}} */
/** {{{ luasandbox_init_globals */
static PHP_GINIT_FUNCTION(luasandbox)
{
memset(luasandbox_globals, 0, sizeof(*luasandbox_globals));
}
/* }}} */
/** {{{ luasandbox_destroy_globals */
static PHP_GSHUTDOWN_FUNCTION(luasandbox)
{
}
/* }}} */
/* {{{ PHP_MSHUTDOWN_FUNCTION
*/
PHP_MSHUTDOWN_FUNCTION(luasandbox)
{
luasandbox_timer_mshutdown();
UNREGISTER_INI_ENTRIES();
return SUCCESS;
}
/* }}} */
/* {{{ PHP_RSHUTDOWN_FUNCTION */
PHP_RSHUTDOWN_FUNCTION(luasandbox)
{
return SUCCESS;
}
/* }}} */
static int luasandbox_post_deactivate() /* {{{ */
{
luasandbox_lib_destroy_globals();
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MINFO_FUNCTION
*/
PHP_MINFO_FUNCTION(luasandbox)
{
php_info_print_table_start();
php_info_print_table_header(2, "luasandbox support", "enabled");
php_info_print_table_end();
DISPLAY_INI_ENTRIES();
}
/* }}} */
/** {{{ luasandbox_new
*
* "new" handler for the LuaSandbox class
*/
static object_constructor_ret_t luasandbox_new(zend_class_entry *ce)
{
php_luasandbox_obj * sandbox;
// Create the internal object
#if PHP_VERSION_ID < 70300
sandbox = (php_luasandbox_obj*)ecalloc(1, sizeof(php_luasandbox_obj) + zend_object_properties_size(ce));
#else
sandbox = (php_luasandbox_obj*)zend_object_alloc(sizeof(php_luasandbox_obj), ce);
#endif
zend_object_std_init(&sandbox->std, ce);
object_properties_init(&sandbox->std, ce);
sandbox->alloc.memory_limit = (size_t)-1;
sandbox->allow_pause = 1;
// Initialise the Lua state
sandbox->state = luasandbox_newstate(sandbox);
// Initialise the timer
luasandbox_timer_create(&sandbox->timer, sandbox);
sandbox->std.handlers = &luasandbox_object_handlers;
LUASANDBOX_G(active_count)++;
return &sandbox->std;
}
/* }}} */
/** {{{ luasandbox_newstate
*
* Create a new lua_State which is suitable for running sandboxed scripts in.
* Initialise libraries and any necessary registry entries.
*/
static lua_State * luasandbox_newstate(php_luasandbox_obj * intern)
{
lua_State * L = luasandbox_alloc_new_state(&intern->alloc, intern);
if (L == NULL) {
php_error_docref(NULL, E_ERROR,
"Attempt to allocate a new Lua state failed");
}
// Disable JIT when using LuaJIT.
#ifdef LUA_JITLIBNAME
if ( LUASANDBOX_G(jit_enabled) ) {
luaJIT_setmode(L, 0, LUAJIT_MODE_ENGINE|LUAJIT_MODE_ON);
} else {
luaJIT_setmode(L, 0, LUAJIT_MODE_ENGINE|LUAJIT_MODE_OFF);
}
#endif
lua_atpanic(L, luasandbox_panic);
// Register the standard library
luasandbox_lib_register(L);
// Set up the data conversion module
luasandbox_data_conversion_init(L);
// Create a table for storing chunks
lua_newtable(L);
lua_setfield(L, LUA_REGISTRYINDEX, "php_luasandbox_chunks");
// Register a pointer to the PHP object so that C functions can find it
lua_pushlightuserdata(L, (void*)intern);
lua_setfield(L, LUA_REGISTRYINDEX, "php_luasandbox_obj");
return L;
}
/* }}} */
/** {{{ luasandbox_free_storage
*
* "Free storage" handler for LuaSandbox objects.
*/
static void luasandbox_free_storage(zend_object *object)
{
php_luasandbox_obj * sandbox = php_luasandbox_fetch_object(object);
luasandbox_timer_destroy(&sandbox->timer);
if (sandbox->state) {
luasandbox_alloc_delete_state(&sandbox->alloc, sandbox->state);
sandbox->state = NULL;
}
zend_object_std_dtor(&sandbox->std);
LUASANDBOX_G(active_count)--;
}
/* }}} */
/** {{{ luasandboxfunction_new
*
* "new" handler for the LuaSandboxFunction class.
*/
static object_constructor_ret_t luasandboxfunction_new(zend_class_entry *ce)
{
php_luasandboxfunction_obj * intern;
// Create the internal object
#if PHP_VERSION_ID < 70300
intern = (php_luasandboxfunction_obj*)ecalloc(1, sizeof(php_luasandboxfunction_obj) + zend_object_properties_size(ce));
#else
intern = (php_luasandboxfunction_obj*)zend_object_alloc(sizeof(php_luasandboxfunction_obj), ce);
#endif
zend_object_std_init(&intern->std, ce);
object_properties_init(&intern->std, ce);
intern->std.handlers = &luasandboxfunction_object_handlers;
return &intern->std;
}
/* }}} */
/** {{{ luasandboxfunction_free_storage
*
* "Free storage" handler for LuaSandboxFunction objects. Deletes the chunk
* from the registry and decrements the reference counter for the parent
* LuaSandbox object.
*/
static void luasandboxfunction_free_storage(zend_object *object)
{
php_luasandboxfunction_obj * func = php_luasandboxfunction_fetch_object(object);
if (LUASANDBOXFUNCTION_SANDBOX_IS_OK(func)) {
zval *zsandbox = LUASANDBOXFUNCTION_GET_SANDBOX_ZVALPTR(func);
php_luasandbox_obj * sandbox = GET_LUASANDBOX_OBJ(zsandbox);
if (sandbox && sandbox->state) {
lua_State * L = sandbox->state;
// Delete the chunk
if (func->index) {
lua_getfield(L, LUA_REGISTRYINDEX, "php_luasandbox_chunks");
lua_pushnil(L);
lua_rawseti(L, -2, func->index);
lua_pop(L, 1);
}
}
// Delete the parent reference
zval_ptr_dtor(&func->sandbox);
ZVAL_UNDEF(&func->sandbox);
}
zend_object_std_dtor(&func->std);
}
/* }}} */
/** {{{ luasandbox_panic
*
* The Lua panic function. It is necessary to raise an E_ERROR, and thus do a
* longjmp(), since if this function returns, Lua will call exit(), breaking
* the Apache child.
*
* Generally, a panic will happen if the Lua API is used incorrectly in an
* unprotected environment. Currently this means C code which is called from
* PHP, not directly or indirectly from lua_pcall(). Sandboxed Lua code is run
* under lua_pcall() so can't cause a panic.
*
* Note that sandboxed Lua code may be executed in an unprotected environment
* if C code accesses a variable with a metamethod defined by the sandboxed
* code. For this reason, the "raw" functions such as lua_rawget() should be
* used where this is a possibility.
*/
static int luasandbox_panic(lua_State * L)
{
php_error_docref(NULL, E_ERROR,
"PANIC: unprotected error in call to Lua API (%s)",
luasandbox_error_to_string(L, -1));
return 0;
}
/* }}} */
/** {{{ luasandbox_state_from_zval
*
* Get a lua state from a zval* containing a LuaSandbox object. If the zval*
* contains something else, bad things will happen.
*/
static lua_State * luasandbox_state_from_zval(zval * this_ptr)
{
php_luasandbox_obj * intern = GET_LUASANDBOX_OBJ(this_ptr);
return intern->state;
}
/* }}} */
/** {{{ luasandbox_load_helper
*
* Common code for LuaSandbox::loadString() and LuaSandbox::loadBinary(). The
* "binary" parameter will be 1 for loadBinary() and 0 for loadString().
*
* For catching Lua errors that might be raised, we need a struct and a helper
* function too.
*/
struct luasandbox_load_helper_params {
php_luasandbox_obj * sandbox;
zval *zthis;
zval *return_value;
char *code;
char *chunkName;
str_param_len_t codeLength;
};
static int luasandbox_load_helper_protected(lua_State* L) {
struct luasandbox_load_helper_params *p = (struct luasandbox_load_helper_params *)lua_touserdata(L, 1);
int status;
zval *return_value = p->return_value;
// Parse the string into a function on the stack
status = luaL_loadbuffer(L, p->code, p->codeLength, p->chunkName);
// Handle any error from luaL_loadbuffer
if (status != 0) {
luasandbox_handle_error(p->sandbox, status);
RETVAL_FALSE;
return 0;
}
// Make a zval out of it, and return false on error
if (!luasandbox_lua_to_zval(p->return_value, L, lua_gettop(L), p->zthis, NULL) ||
Z_TYPE_P(p->return_value) == IS_NULL
) {
php_error_docref(NULL, E_WARNING, "too many chunks loaded already");
RETVAL_FALSE;
}
// Balance the stack
lua_pop(L, 1);
return 0;
}
static void luasandbox_load_helper(int binary, INTERNAL_FUNCTION_PARAMETERS)
{
struct luasandbox_load_helper_params p;
str_param_len_t chunkNameLength;
lua_State * L;
int have_mark;
int was_paused;
int status;
p.sandbox = GET_LUASANDBOX_OBJ(getThis());
L = p.sandbox->state;
CHECK_VALID_STATE(L);
p.chunkName = NULL;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|s",
&p.code, &p.codeLength, &p.chunkName, &chunkNameLength) == FAILURE) {
RETURN_FALSE;
}
if (p.chunkName == NULL) {
p.chunkName = "";
} else {
// Check chunkName for nulls
if (strlen(p.chunkName) != chunkNameLength) {
php_error_docref(NULL, E_WARNING,
"chunk name may not contain null characters");
RETURN_FALSE;
}
}
// Check to see if the code is binary (with precompiled data mark) if this
// was called as loadBinary(), and plain code (without mark) if this was
// called as loadString()
#ifdef LUA_JITLIBNAME
have_mark = (php_memnstr(p.code, "\033LJ",
sizeof("\033LJ") - 1, p.code + p.codeLength) != NULL);
#else
have_mark = (php_memnstr(p.code, LUA_SIGNATURE,
sizeof(LUA_SIGNATURE) - 1, p.code + p.codeLength) != NULL);
#endif
if (binary && !have_mark) {
php_error_docref(NULL, E_WARNING,
"the string does not appear to be a valid binary chunk");
RETURN_FALSE;
} else if (!binary && have_mark) {
php_error_docref(NULL, E_WARNING,
"cannot load code with a Lua binary chunk marker escape sequence in it");
RETURN_FALSE;
}
// Make sure this is counted against the Lua usage time limit
was_paused = luasandbox_timer_is_paused(&p.sandbox->timer);
luasandbox_timer_unpause(&p.sandbox->timer);
p.zthis = getThis();
p.return_value = return_value;
status = lua_cpcall(L, luasandbox_load_helper_protected, &p);
// If the timers were paused before, re-pause them now
if (was_paused) {
luasandbox_timer_pause(&p.sandbox->timer);
}
// Handle any error from Lua
if (status != 0) {
luasandbox_handle_error(p.sandbox, status);
RETURN_FALSE;
}
}
/* }}} */
/** {{{ proto static array LuaSandbox::getVersionInfo()
*
* Return the versions of LuaSandbox and Lua, as an associative array.
*/
PHP_METHOD(LuaSandbox, getVersionInfo)
{
array_init_size(return_value, 2);
compat_add_assoc_string(return_value, "LuaSandbox", LUASANDBOX_VERSION);
compat_add_assoc_string(return_value, "Lua", LUA_RELEASE);
#ifdef LUAJIT_VERSION
compat_add_assoc_string(return_value, "LuaJIT", LUAJIT_VERSION);
#endif
}
/* }}} */
/** {{{ proto LuaSandboxFunction LuaSandbox::loadString(string code, string chunkName = '')
*
* Load a string into the LuaSandbox object. Returns a LuaSandboxFunction object
* which can be called or dumped.
*
* Note that global functions and variables defined in the chunk will not be
* present in the Lua state until the chunk is executed. Function definitions
* in Lua are a kind of executable statement.
*/
PHP_METHOD(LuaSandbox, loadString)
{
luasandbox_load_helper(0, INTERNAL_FUNCTION_PARAM_PASSTHRU);
}
/* }}} */
/** {{{ proto LuaSandboxFunction LuaSandbox::loadBinary(string bin, string chunkName = '')
* Load a string containing a precompiled binary chunk from
* LuaSandboxFunction::dump() or the Lua compiler luac. Returns a
* LuaSandboxFunction object.
*/
PHP_METHOD(LuaSandbox, loadBinary)
{
luasandbox_load_helper(1, INTERNAL_FUNCTION_PARAM_PASSTHRU);
}
/* }}} */
/** {{{ luasandbox_handle_error
*
* Handles the error return situation from lua_pcall() and lua_load(), where a
* status is returned and an error message pushed to the stack. Throws a suitable
* exception.
*
* This method shouldn't raise any Lua errors. This is accomplished by
* judicious disabling of the memory limit and by using a pcall for one bit
* that is otherwise unsafe.
*/
static int luasandbox_safe_trace_to_zval(lua_State* L) {
zval *zsandbox = (zval *)lua_touserdata(L, 2);
zval *ztrace = (zval *)lua_touserdata(L, 3);
luasandbox_lua_to_zval(ztrace, L, 1, zsandbox, NULL);
return 0;
}
static void luasandbox_handle_error(php_luasandbox_obj * sandbox, int status)
{
lua_State * L = sandbox->state;
const char * errorMsg;
zend_class_entry * ce;
zval *zex, *ztrace;
size_t old_memory_limit;
zval zvex, zvtrace;
zex = &zvex;
ztrace = &zvtrace;
ZVAL_NULL(ztrace);
if (EG(exception)) {
lua_pop(L, 1);
return;
}
// Temporarily disable the memory limit while fetching the error string, so
// the fetch doesn't raise a memory error.
old_memory_limit = sandbox->alloc.memory_limit;
sandbox->alloc.memory_limit = (size_t)-1;
errorMsg = luasandbox_error_to_string(L, -1);
sandbox->alloc.memory_limit = old_memory_limit;
switch (status) {
case LUA_ERRRUN:
default:
if (luasandbox_is_fatal(L, -1)) {
if (!strcmp(errorMsg, luasandbox_timeout_message)) {
ce = luasandboxtimeouterror_ce;
} else {
ce = luasandboxfatalerror_ce;
}
} else {
ce = luasandboxruntimeerror_ce;
}
break;
case LUA_ERRSYNTAX:
ce = luasandboxsyntaxerror_ce;
break;
case LUA_ERRMEM:
ce = luasandboxmemoryerror_ce;
break;
case LUA_ERRERR:
ce = luasandboxerrorerror_ce;
break;
}
object_init_ex(zex, ce);
if (luasandbox_is_trace_error(L, -1)) {
// Here we can't just ignore the memory limit since
// luasandbox_lua_to_zval can throw non-memory errors. So make a pcall
// to do the conversion.
//
// But we can and should ignore the memory limit while pushing the
// parameters for the pcall onto the stack.
old_memory_limit = sandbox->alloc.memory_limit;
sandbox->alloc.memory_limit = (size_t)-1;
lua_pushcfunction(L, luasandbox_safe_trace_to_zval);
lua_rawgeti(L, -2, 3);
lua_pushlightuserdata(L, LUASANDBOX_GET_CURRENT_ZVAL_PTR(sandbox));
lua_pushlightuserdata(L, ztrace);
lua_pushlightuserdata(L, NULL);
sandbox->alloc.memory_limit = old_memory_limit;
if (lua_pcall(L, 4, 0, 0) == 0) {
// Put it in the exception object
luasandbox_update_property(ce, zex, "luaTrace", sizeof("luaTrace")-1, ztrace);
} else {
// lua_pcall pushed an error on the stack.
old_memory_limit = sandbox->alloc.memory_limit;
sandbox->alloc.memory_limit = (size_t)-1;
php_error_docref(NULL, E_WARNING, "Failed to generate Lua trace (%s)",
luasandbox_error_to_string(L, -1));
sandbox->alloc.memory_limit = old_memory_limit;
lua_pop(L, 1);
}
}
zval_ptr_dtor(&zvtrace);
// Initialise standard properties
// We would get Zend to do this, but the code for it is wrapped inside some
// very inconvenient interfaces (so inconvenient that Zend itself
// duplicates this code in several places).
luasandbox_update_property_string(ce, zex, "message", sizeof("message")-1, errorMsg);
luasandbox_update_property_long(ce, zex, "code", sizeof("code")-1, status);
zend_throw_exception_object(zex);
lua_pop(L, 1);
}
/* }}} */
/** {{{ proto void LuaSandbox::setMemoryLimit(int limit)
*
* Set the memory limit for the Lua state. If the memory limit is exceeded,
* the allocator will return NULL. When running protected code, this will
* result in a LuaSandboxError exception being thrown. If this occurs in
* unprotected code, say due to loading too many functions with loadString(),
* a panic will be triggered, leading to a PHP fatal error.
*/
PHP_METHOD(LuaSandbox, setMemoryLimit)
{
long_param_t limit;
php_luasandbox_obj * intern = GET_LUASANDBOX_OBJ(getThis());
if (zend_parse_parameters(ZEND_NUM_ARGS(), "l",
&limit) == FAILURE)
{
RETURN_FALSE;
}
intern->alloc.memory_limit = limit;
}
/* }}} */
/** {{{ proto void LuaSandbox::setCPULimit(mixed limit)
*
* Set the limit of CPU time (user+system) for all LuaSandboxFunction::call()
* calls against this LuaSandbox instance. The limit is specified in seconds,
* or false to disable the limiter.
*
* When the time limit expires, a flag will be set which causes a
* LuaSandboxError exception to be thrown when the currently-running Lua
* statement finishes.
*
* Setting the time limit from a callback while Lua is running causes the timer
* to be reset, or started if it was not already running.
*/
PHP_METHOD(LuaSandbox, setCPULimit)
{
zval *zp_limit = NULL;
php_luasandbox_obj * sandbox = GET_LUASANDBOX_OBJ(getThis());
struct timespec limit = {0, 0};
if (zend_parse_parameters(ZEND_NUM_ARGS(), "z/",
&zp_limit) == FAILURE)
{
RETURN_FALSE;
}
if (!zp_limit
#ifdef IS_BOOL
|| (Z_TYPE_P(zp_limit) == IS_BOOL && Z_BVAL_P(zp_limit) == 0)
#else
|| Z_TYPE_P(zp_limit) == IS_FALSE
#endif
) {
// No limit
sandbox->is_cpu_limited = 0;
} else {
convert_to_double(zp_limit);
luasandbox_set_timespec(&limit, Z_DVAL_P(zp_limit));
sandbox->is_cpu_limited = 1;
}
// Set the timer
luasandbox_timer_set_limit(&sandbox->timer, &limit);
}
/* }}} */
/** {{{ luasandbox_set_timespec
* Initialise a timespec structure with the time in seconds given by the source
* argument.
*/
static void luasandbox_set_timespec(struct timespec * dest, double source)
{
double fractional, integral;
if (source < 0) {
dest->tv_sec = dest->tv_nsec = 0;
return;
}
fractional = modf(source, &integral);
dest->tv_sec = (time_t)integral;
dest->tv_nsec = (long)(fractional * 1000000000.0);
if (dest->tv_nsec >= 1000000000L) {
dest->tv_nsec -= 1000000000L;
dest->tv_sec ++;
}
}
/* }}} */
/** {{{ proto float LuaSandbox::getCPUUsage()
*
* Get the amount of CPU used by this LuaSandbox instance, including any PHP
* functions called by Lua.
*/
PHP_METHOD(LuaSandbox, getCPUUsage)
{
struct timespec ts;
php_luasandbox_obj * sandbox = GET_LUASANDBOX_OBJ(getThis());
if (zend_parse_parameters(ZEND_NUM_ARGS(), "") == FAILURE) {
RETURN_FALSE;
}
luasandbox_timer_get_usage(&sandbox->timer, &ts);
RETURN_DOUBLE(ts.tv_sec + 1e-9 * ts.tv_nsec);
}
/* }}} */
/** {{{ proto bool LuaSandbox::pauseUsageTimer()
*
* Pause the CPU usage timer, and the time limit set by LuaSandbox::setCPULimit.
*
* This only has effect when called from within a callback from Lua. When
* execution returns to Lua, the timers will be automatically unpaused. If a
* new call into Lua is made, the timers will be unpaused for the duration of
* that call.
*
* If a PHP callback calls into Lua again with timers not paused, and then that
* Lua function calls into PHP again, the second PHP call will not be able to
* pause the timers. The logic is that even though the second PHP call would
* avoid counting the CPU usage against the limit, the first call still counts
* it.
*
* Returns true if the timers are now paused, false if not.
*/
PHP_METHOD(LuaSandbox, pauseUsageTimer)
{
php_luasandbox_obj * sandbox = GET_LUASANDBOX_OBJ(getThis());
if (zend_parse_parameters(ZEND_NUM_ARGS(), "") == FAILURE) {
RETURN_FALSE;
}
if ( !sandbox->allow_pause || !sandbox->in_lua ) {
RETURN_FALSE;
}
luasandbox_timer_pause(&sandbox->timer);
RETURN_TRUE;
}
/* }}} */
/** {{{ proto void LuaSandbox::unpauseUsageTimer()
*
* Unpause timers paused by LuaSandbox::pauseUsageTimer.
*/
PHP_METHOD(LuaSandbox, unpauseUsageTimer)
{
php_luasandbox_obj * sandbox = GET_LUASANDBOX_OBJ(getThis());
if (zend_parse_parameters(ZEND_NUM_ARGS(), "") == FAILURE) {
RETURN_FALSE;
}
luasandbox_timer_unpause(&sandbox->timer);
RETURN_NULL();
}
/* }}} */
/* {{{ proto boolean LuaSandbox::enableProfiler(float period = 0.002)
*
* Enable the profiler. Profiling will begin when Lua code is entered.
*
* We use a sampling profiler, with samples taken with the specified sampling
* period, in seconds. Testing indicates that at least on Linux, setting a
* period less than 1ms will lead to a high overrun count but no performance
* problems.
*/
PHP_METHOD(LuaSandbox, enableProfiler)
{
double period = 2e-3;
struct timespec ts;
php_luasandbox_obj * sandbox = GET_LUASANDBOX_OBJ(getThis());
if (zend_parse_parameters(ZEND_NUM_ARGS(), "|d", &period) == FAILURE) {
RETURN_FALSE;
}
luasandbox_set_timespec(&ts, period);
RETURN_BOOL(luasandbox_timer_enable_profiler(&sandbox->timer, &ts));
}
/* }}} */
/* {{{ proto void LuaSandbox::disableProfiler()
*