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taint.c
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/*
+----------------------------------------------------------------------+
| Taint |
+----------------------------------------------------------------------+
| Copyright (c) 2012-2015 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Xinchen Hui <laruence@php.net> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "SAPI.h"
#include "zend_compile.h"
#include "zend_execute.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_taint.h"
ZEND_DECLARE_MODULE_GLOBALS(taint)
/* {{{ TAINT_ARG_INFO
*/
ZEND_BEGIN_ARG_INFO_EX(taint_arginfo, 0, 0, 1)
ZEND_ARG_INFO(1, string)
ZEND_ARG_INFO(1, ...)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(untaint_arginfo, 0, 0, 1)
ZEND_ARG_INFO(1, string)
ZEND_ARG_INFO(1, ...)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(is_tainted_arginfo, 0, 0, 1)
ZEND_ARG_INFO(0, string)
ZEND_END_ARG_INFO()
/* }}} */
/* {{{ taint_functions[]
*/
zend_function_entry taint_functions[] = {
PHP_FE(taint, taint_arginfo)
PHP_FE(untaint, untaint_arginfo)
PHP_FE(is_tainted, is_tainted_arginfo)
{NULL, NULL, NULL}
};
/* }}} */
/** {{{ module depends
*/
#if ZEND_MODULE_API_NO >= 20050922
zend_module_dep taint_deps[] = {
ZEND_MOD_CONFLICTS("xdebug")
{NULL, NULL, NULL}
};
#endif
/* }}} */
/* {{{ taint_module_entry
*/
zend_module_entry taint_module_entry = {
#if ZEND_MODULE_API_NO >= 20050922
STANDARD_MODULE_HEADER_EX, NULL,
taint_deps,
#else
STANDARD_MODULE_HEADER,
#endif
"taint",
taint_functions,
PHP_MINIT(taint),
PHP_MSHUTDOWN(taint),
PHP_RINIT(taint), /* Replace with NULL if there's nothing to do at request start */
PHP_RSHUTDOWN(taint), /* Replace with NULL if there's nothing to do at request end */
PHP_MINFO(taint),
#if ZEND_MODULE_API_NO >= 20010901
PHP_TAINT_VERSION, /* Replace with version number for your extension */
#endif
PHP_MODULE_GLOBALS(taint),
NULL,
NULL,
NULL,
STANDARD_MODULE_PROPERTIES_EX
};
/* }}} */
static struct taint_overridden_fucs /* {{{ */ {
php_func strval;
php_func sprintf;
php_func vsprintf;
php_func explode;
php_func implode;
php_func trim;
php_func rtrim;
php_func ltrim;
php_func strstr;
php_func str_pad;
php_func str_replace;
php_func substr;
php_func strtolower;
php_func strtoupper;
} taint_origin_funcs;
#define TAINT_O_FUNC(m) (taint_origin_funcs.m)
/* }}} */
static void php_taint_mark_strings(zval *symbol_table TSRMLS_DC) /* {{{ */ {
zval **ppzval;
HashTable *ht = Z_ARRVAL_P(symbol_table);
HashPosition pos = {0};
for(zend_hash_internal_pointer_reset_ex(ht, &pos);
zend_hash_has_more_elements_ex(ht, &pos) == SUCCESS;
zend_hash_move_forward_ex(ht, &pos)) {
if (zend_hash_get_current_data_ex(ht, (void**)&ppzval, &pos) == FAILURE) {
continue;
}
if (Z_TYPE_PP(ppzval) == IS_ARRAY) {
php_taint_mark_strings(*ppzval TSRMLS_CC);
} else if (IS_STRING == Z_TYPE_PP(ppzval)) {
Z_STRVAL_PP(ppzval) = erealloc(Z_STRVAL_PP(ppzval), Z_STRLEN_PP(ppzval) + 1 + PHP_TAINT_MAGIC_LENGTH);
PHP_TAINT_MARK(*ppzval, PHP_TAINT_MAGIC_POSSIBLE);
}
}
} /* }}} */
static void taint_pzval_unlock_func(zval *z, taint_free_op *should_free, int unref) /* {{{ */ {
if (!Z_DELREF_P(z)) {
Z_SET_REFCOUNT_P(z, 1);
Z_UNSET_ISREF_P(z);
should_free->var = z;
} else {
should_free->var = 0;
if (unref && Z_ISREF_P(z) && Z_REFCOUNT_P(z) == 1) {
should_free->is_ref = 1;
Z_UNSET_ISREF_P(z);
}
}
} /* }}} */
static void taint_pzval_unlock_free_func(zval *z) /* {{{ */ {
if (!Z_DELREF_P(z)) {
zval_dtor(z);
safe_free_zval_ptr(z);
}
} /* }}} */
static void taint_pzval_lock_func(zval *z, taint_free_op *should_free) /* {{{ */ {
if (should_free->type == IS_VAR) {
Z_ADDREF_P(z);
if (should_free->var && should_free->is_ref) {
Z_SET_ISREF_P(z);
}
}
} /* }}} */
static void php_taint_get_cv_address(zend_compiled_variable *cv, zval ***ptr, temp_variable *Ts TSRMLS_DC) /* {{{ */ {
zval *new_zval = &EG(uninitialized_zval);
Z_ADDREF_P(new_zval);
zend_hash_quick_update(EG(active_symbol_table), cv->name, cv->name_len+1, cv->hash_value, &new_zval, sizeof(zval *), (void **)ptr);
}
/* }}} */
static zval **php_taint_get_obj_zval_ptr_ptr_unused(TSRMLS_D) /* {{{ */ {
if (EG(This)) {
return &EG(This);
} else {
zend_error(E_ERROR, "Using $this when not in object context");
return NULL;
}
} /* }}} */
static void make_real_object(zval **object_ptr TSRMLS_DC) /* {{{ */ {
if (Z_TYPE_PP(object_ptr) == IS_NULL
|| (Z_TYPE_PP(object_ptr) == IS_BOOL && Z_LVAL_PP(object_ptr) == 0)
|| (Z_TYPE_PP(object_ptr) == IS_STRING && Z_STRLEN_PP(object_ptr) == 0)
) {
zend_error(E_STRICT, "Creating default object from empty value");
SEPARATE_ZVAL_IF_NOT_REF(object_ptr);
zval_dtor(*object_ptr);
object_init(*object_ptr);
}
} /* }}} */
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
static zval * php_taint_get_zval_ptr_var(znode *node, temp_variable *Ts, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
zval *ptr = TAINT_TS(node->u.var).var.ptr;
if (ptr) {
TAINT_PZVAL_UNLOCK(ptr, should_free);
return ptr;
} else {
temp_variable *T = (temp_variable *)((char *)Ts + node->u.var);
zval *str = T->str_offset.str;
/* string offset */
ALLOC_ZVAL(ptr);
T->str_offset.ptr = ptr;
should_free->var = ptr;
if (T->str_offset.str->type != IS_STRING
|| ((int)T->str_offset.offset < 0)
|| (T->str_offset.str->value.str.len <= (int)T->str_offset.offset)) {
ptr->value.str.val = STR_EMPTY_ALLOC();
ptr->value.str.len = 0;
} else {
char c = str->value.str.val[T->str_offset.offset];
ptr->value.str.val = estrndup(&c, 1);
ptr->value.str.len = 1;
}
TAINT_PZVAL_UNLOCK_FREE(str);
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 3)
ptr->refcount = 1;
ptr->is_ref = 1;
#else
ptr->refcount__gc = 1;
ptr->is_ref__gc = 1;
#endif
ptr->type = IS_STRING;
return ptr;
}
} /* }}} */
static zval * php_taint_get_zval_ptr_cv(znode *node, temp_variable *Ts TSRMLS_DC) /* {{{ */ {
zval ***ptr = &TAINT_CV_OF(node->u.var);
if (!*ptr) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(node->u.var);
if (!EG(active_symbol_table) || zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len + 1, cv->hash_value, (void **)ptr) == FAILURE) {
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
return &EG(uninitialized_zval);
}
}
return **ptr;
} /* }}} */
static zval * php_taint_get_zval_ptr_tmp(znode *node, temp_variable *Ts, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
return should_free->var = &TAINT_TS(node->u.var).tmp_var;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr_var(znode *node, temp_variable *Ts, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
zval** ptr_ptr = TAINT_TS(node->u.var).var.ptr_ptr;
if (ptr_ptr) {
TAINT_PZVAL_UNLOCK(*ptr_ptr, should_free);
} else {
/* string offset */
TAINT_PZVAL_UNLOCK(TAINT_TS(node->u.var).str_offset.str, should_free);
}
return ptr_ptr;
} /* }}} */
static zval **php_taint_get_zval_ptr_ptr_cv(znode *node, temp_variable *Ts, int type TSRMLS_DC) /* {{{ */ {
zval ***ptr = &TAINT_CV_OF(node->u.var);
if (!*ptr) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(node->u.var);
if (!EG(active_symbol_table)
|| zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len+1, cv->hash_value, (void **) ptr )==FAILURE) {
switch (type) {
case BP_VAR_R:
case BP_VAR_UNSET:
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
/* break missing intentionally */
case BP_VAR_IS:
return &EG(uninitialized_zval_ptr);
break;
case BP_VAR_RW:
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
/* break missing intentionally */
case BP_VAR_W:
php_taint_get_cv_address(cv, ptr, Ts TSRMLS_CC);
break;
}
}
}
return *ptr;
} /* }}} */
static zval **php_taint_get_zval_ptr_ptr(znode *node, temp_variable *Ts, taint_free_op *should_free, int type TSRMLS_DC) /* {{{ */ {
should_free->type = node->op_type;
if (node->op_type == IS_CV) {
should_free->var = 0;
return php_taint_get_zval_ptr_ptr_cv(node, Ts, type TSRMLS_CC);
} else if (node->op_type == IS_VAR) {
return php_taint_get_zval_ptr_ptr_var(node, Ts, should_free TSRMLS_CC);
} else {
should_free->var = 0;
return NULL;
}
} /* }}} */
static zval *php_taint_get_zval_ptr(znode *node, temp_variable *Ts, taint_free_op *should_free, int type TSRMLS_DC) /* {{{ */ {
/* should_free->is_var = 0; */
switch (node->op_type) {
case IS_CONST:
should_free->var = 0;
return &node->u.constant;
break;
case IS_TMP_VAR:
should_free->var = TAINT_TMP_FREE(&TAINT_TS(node->u.var).tmp_var);
return &TAINT_TS(node->u.var).tmp_var;
break;
case IS_VAR:
return php_taint_get_zval_ptr_var(node, Ts, should_free TSRMLS_CC);
break;
case IS_UNUSED:
should_free->var = 0;
return NULL;
break;
case IS_CV:
should_free->var = 0;
return php_taint_get_zval_ptr_cv(node, Ts TSRMLS_CC);
break;
EMPTY_SWITCH_DEFAULT_CASE()
}
return NULL;
} /* }}} */
static int php_taint_qm_assign_handler(ZEND_OPCODE_HANDLER_ARGS) /* {{{ */ {
zend_op *opline = execute_data->opline;
zval *op1 = NULL;
taint_free_op free_op1 = {0};
switch(TAINT_OP1_TYPE(opline)) {
case IS_TMP_VAR:
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data->Ts, &free_op1 TSRMLS_CC);
break;
case IS_VAR:
op1 = php_taint_get_zval_ptr_var(TAINT_OP1_NODE_PTR(opline), execute_data->Ts, &free_op1 TSRMLS_CC);
break;
case IS_CV:
op1 = php_taint_get_zval_ptr_cv(TAINT_OP1_NODE_PTR(opline), TAINT_GET_ZVAL_PTR_CV_2ND_ARG(BP_VAR_R) TSRMLS_CC);
break;
case IS_CONST:
op1 = TAINT_OP1_CONSTANT_PTR(opline);
break;
}
TAINT_T(TAINT_RESULT_VAR(opline)).tmp_var = *op1;
if (!((zend_uintptr_t)free_op1.var & 1L)) {
zval_copy_ctor(&TAINT_T(TAINT_RESULT_VAR(opline)).tmp_var);
if (op1 && IS_STRING == Z_TYPE_P(op1) && PHP_TAINT_POSSIBLE(op1)) {
zval *result = &TAINT_T(TAINT_RESULT_VAR(opline)).tmp_var;
Z_STRVAL_P(result) = erealloc(Z_STRVAL_P(result), Z_STRLEN_P(result) + 1 + PHP_TAINT_MAGIC_LENGTH);
PHP_TAINT_MARK(result, PHP_TAINT_MAGIC_POSSIBLE);
}
}
switch (TAINT_OP1_TYPE(opline)) {
case IS_TMP_VAR:
zval_dtor(free_op1.var);
break;
case IS_VAR:
if (free_op1.var) {
zval_ptr_dtor(&free_op1.var);
}
break;
}
execute_data->opline++;
return ZEND_USER_OPCODE_CONTINUE;
} /* }}} */
#elif (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
static zval * php_taint_get_zval_ptr_var(zend_uint var, const zend_execute_data *execute_data, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
zval *ptr = TAINT_T(var).var.ptr;
TAINT_PZVAL_UNLOCK(ptr, should_free);
return ptr;
} /* }}} */
static zval * php_taint_get_zval_ptr_cv(zend_uint var, int type TSRMLS_DC) /* {{{ */ {
zval ***ptr = EX_CV_NUM(EG(current_execute_data), var);
if (UNEXPECTED(*ptr == NULL)) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(var);
if (!EG(active_symbol_table) || zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len + 1, cv->hash_value, (void **)ptr) == FAILURE) {
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
return &EG(uninitialized_zval);
}
}
return **ptr;
} /* }}} */
static zval * php_taint_get_zval_ptr_tmp(zend_uint var, const zend_execute_data *execute_data, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
return should_free->var = &TAINT_T(var).tmp_var;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr_var(zend_uint var, const zend_execute_data *execute_data, taint_free_op *should_free TSRMLS_DC)/* {{{ */ {
zval** ptr_ptr = TAINT_T(var).var.ptr_ptr;
if (EXPECTED(ptr_ptr != NULL)) {
TAINT_PZVAL_UNLOCK(*ptr_ptr, should_free);
} else {
/* string offset */
TAINT_PZVAL_UNLOCK(TAINT_T(var).str_offset.str, should_free);
}
return ptr_ptr;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr_cv(zend_uint var, int type TSRMLS_DC) /* {{{ */ {
zval ***ptr = &TAINT_CV_OF(var);
if (UNEXPECTED(*ptr == NULL)) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(var);
if (!EG(active_symbol_table)
|| zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len+1, cv->hash_value, (void **) ptr )==FAILURE) {
switch (type) {
case BP_VAR_R:
case BP_VAR_UNSET:
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
/* break missing intentionally */
case BP_VAR_IS:
return &EG(uninitialized_zval_ptr);
break;
case BP_VAR_RW:
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
/* break missing intentionally */
case BP_VAR_W:
Z_ADDREF(EG(uninitialized_zval));
if (!EG(active_symbol_table)) {
*ptr = (zval**)EX_CV_NUM(EG(current_execute_data), EG(active_op_array)->last_var + var);
**ptr = &EG(uninitialized_zval);
} else {
zend_hash_quick_update(EG(active_symbol_table), cv->name, cv->name_len+1, cv->hash_value, &EG(uninitialized_zval_ptr), sizeof(zval *), (void **)ptr);
}
break;
}
}
}
return *ptr;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr(int op_type, const znode_op *node, const zend_execute_data *execute_data, taint_free_op *should_free, int type TSRMLS_DC) /* {{{ */ {
should_free->type = op_type;
if (op_type == IS_CV) {
should_free->var = 0;
return php_taint_get_zval_ptr_ptr_cv(node->var, type TSRMLS_CC);
} else if (op_type == IS_VAR) {
return php_taint_get_zval_ptr_ptr_var(node->var, execute_data, should_free TSRMLS_CC);
} else {
should_free->var = 0;
return NULL;
}
} /* }}} */
static zval *php_taint_get_zval_ptr(int op_type, const znode_op *node, const zend_execute_data *execute_data, taint_free_op *should_free, int type TSRMLS_DC) /* {{{ */ {
/* should_free->is_var = 0; */
switch (op_type) {
case IS_CONST:
should_free->var = 0;
return node->zv;
break;
case IS_TMP_VAR:
should_free->var = TAINT_TMP_FREE(&TAINT_T(node->var).tmp_var);
return &TAINT_T(node->var).tmp_var;
break;
case IS_VAR:
return php_taint_get_zval_ptr_var(node->var, execute_data, should_free TSRMLS_CC);
break;
case IS_UNUSED:
should_free->var = 0;
return NULL;
break;
case IS_CV:
should_free->var = 0;
return php_taint_get_zval_ptr_cv(node->var, type TSRMLS_CC);
break;
EMPTY_SWITCH_DEFAULT_CASE()
}
return NULL;
} /* }}} */
#else
static zval * php_taint_get_zval_ptr_var(zend_uint var, const temp_variable *Ts, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
zval *ptr = TAINT_TS(var).var.ptr;
TAINT_PZVAL_UNLOCK(ptr, should_free);
return ptr;
} /* }}} */
static zval * php_taint_get_zval_ptr_cv(zend_uint var, int type TSRMLS_DC) /* {{{ */ {
zval ***ptr = &TAINT_CV_OF(var);
if (UNEXPECTED(*ptr == NULL)) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(var);
if (!EG(active_symbol_table) || zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len + 1, cv->hash_value, (void **)ptr) == FAILURE) {
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
return &EG(uninitialized_zval);
}
}
return **ptr;
} /* }}} */
static zval * php_taint_get_zval_ptr_tmp(zend_uint var, const temp_variable *Ts, taint_free_op *should_free TSRMLS_DC) /* {{{ */ {
return should_free->var = &TAINT_TS(var).tmp_var;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr_var(zend_uint var, const temp_variable *Ts, taint_free_op *should_free TSRMLS_DC)/* {{{ */ {
zval** ptr_ptr = TAINT_TS(var).var.ptr_ptr;
if (EXPECTED(ptr_ptr != NULL)) {
TAINT_PZVAL_UNLOCK(*ptr_ptr, should_free);
} else {
/* string offset */
TAINT_PZVAL_UNLOCK(TAINT_TS(var).str_offset.str, should_free);
}
return ptr_ptr;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr_cv(zend_uint var, int type TSRMLS_DC) /* {{{ */ {
zval ***ptr = &TAINT_CV_OF(var);
if (UNEXPECTED(*ptr == NULL)) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(var);
if (!EG(active_symbol_table)
|| zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len+1, cv->hash_value, (void **) ptr )==FAILURE) {
switch (type) {
case BP_VAR_R:
case BP_VAR_UNSET:
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
/* break missing intentionally */
case BP_VAR_IS:
return &EG(uninitialized_zval_ptr);
break;
case BP_VAR_RW:
zend_error(E_NOTICE, "Undefined variable: %s", cv->name);
/* break missing intentionally */
case BP_VAR_W:
Z_ADDREF(EG(uninitialized_zval));
if (!EG(active_symbol_table)) {
*ptr = (zval**)EG(current_execute_data)->CVs + (EG(active_op_array)->last_var + var);
**ptr = &EG(uninitialized_zval);
} else {
zend_hash_quick_update(EG(active_symbol_table), cv->name, cv->name_len+1, cv->hash_value, &EG(uninitialized_zval_ptr), sizeof(zval *), (void **)ptr);
}
break;
}
}
}
return *ptr;
} /* }}} */
static zval ** php_taint_get_zval_ptr_ptr(int op_type, const znode_op *node, const temp_variable *Ts, taint_free_op *should_free, int type TSRMLS_DC) /* {{{ */ {
should_free->type = op_type;
if (op_type == IS_CV) {
should_free->var = 0;
return php_taint_get_zval_ptr_ptr_cv(node->var, type TSRMLS_CC);
} else if (op_type == IS_VAR) {
return php_taint_get_zval_ptr_ptr_var(node->var, Ts, should_free TSRMLS_CC);
} else {
should_free->var = 0;
return NULL;
}
} /* }}} */
static zval *php_taint_get_zval_ptr(int op_type, const znode_op *node, const temp_variable *Ts, taint_free_op *should_free, int type TSRMLS_DC) /* {{{ */ {
/* should_free->is_var = 0; */
switch (op_type) {
case IS_CONST:
should_free->var = 0;
return node->zv;
break;
case IS_TMP_VAR:
should_free->var = TAINT_TMP_FREE(&TAINT_TS(node->var).tmp_var);
return &TAINT_TS(node->var).tmp_var;
break;
case IS_VAR:
return php_taint_get_zval_ptr_var(node->var, Ts, should_free TSRMLS_CC);
break;
case IS_UNUSED:
should_free->var = 0;
return NULL;
break;
case IS_CV:
should_free->var = 0;
return php_taint_get_zval_ptr_cv(node->var, type TSRMLS_CC);
break;
EMPTY_SWITCH_DEFAULT_CASE()
}
return NULL;
} /* }}} */
#endif
static void php_taint_error(const char *docref TSRMLS_DC, const char *format, ...) /* {{{ */ {
va_list args;
va_start(args, format);
php_verror(docref, "", TAINT_G(error_level), format, args TSRMLS_CC);
va_end(args);
} /* }}} */
static int php_taint_echo_handler(ZEND_OPCODE_HANDLER_ARGS) /* {{{ */ {
zend_op *opline = execute_data->opline;
zval *op1 = NULL;
taint_free_op free_op1 = {0};
switch(TAINT_OP1_TYPE(opline)) {
case IS_TMP_VAR:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data, &free_op1 TSRMLS_CC);
#else
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data->Ts, &free_op1 TSRMLS_CC);
#endif
break;
case IS_VAR:
op1 = TAINT_T(TAINT_OP1_VAR(opline)).var.ptr;
break;
case IS_CV: {
zval **t = TAINT_CV_OF(TAINT_OP1_VAR(opline));
if (t && *t) {
op1 = *t;
} else if (EG(active_symbol_table)) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(TAINT_OP1_VAR(opline));
if (zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len + 1, cv->hash_value, (void **)&t) == SUCCESS) {
op1 = *t;
}
}
}
break;
}
if (op1 && IS_STRING == Z_TYPE_P(op1) && PHP_TAINT_POSSIBLE(op1)) {
if (ZEND_ECHO == opline->opcode) {
php_taint_error("function.echo" TSRMLS_CC, "Attempt to echo a string that might be tainted");
} else {
php_taint_error("function.print" TSRMLS_CC, "Attempt to print a string that might be tainted");
}
}
return ZEND_USER_OPCODE_DISPATCH;
} /* }}} */
static int php_taint_include_or_eval_handler(ZEND_OPCODE_HANDLER_ARGS) /* {{{ */ {
zend_op *opline = execute_data->opline;
zval *op1 = NULL;
taint_free_op free_op1 = {0};
switch(TAINT_OP1_TYPE(opline)) {
case IS_TMP_VAR:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data, &free_op1 TSRMLS_CC);
#else
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data->Ts, &free_op1 TSRMLS_CC);
#endif
break;
case IS_VAR:
op1 = TAINT_T(TAINT_OP1_VAR(opline)).var.ptr;
break;
case IS_CV: {
zval **t = TAINT_CV_OF(TAINT_OP1_VAR(opline));
if (t && *t) {
op1 = *t;
} else if (EG(active_symbol_table)) {
zend_compiled_variable *cv = &TAINT_CV_DEF_OF(TAINT_OP1_VAR(opline));
if (zend_hash_quick_find(EG(active_symbol_table), cv->name, cv->name_len + 1, cv->hash_value, (void **)&t) == SUCCESS) {
op1 = *t;
}
}
}
break;
case IS_CONST:
op1 = TAINT_OP1_CONSTANT_PTR(opline);
break;
}
if ((op1 && IS_STRING == Z_TYPE_P(op1) && PHP_TAINT_POSSIBLE(op1)))
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
switch (Z_LVAL(opline->op2.u.constant)) {
#else
switch (opline->extended_value) {
#endif
case ZEND_INCLUDE_ONCE:
php_taint_error("function.include_once" TSRMLS_CC, "File path contains data that might be tainted");
break;
case ZEND_REQUIRE_ONCE:
php_taint_error("function.require_once" TSRMLS_CC, "File path contains data that might be tainted");
break;
case ZEND_INCLUDE:
php_taint_error("function.include" TSRMLS_CC, "File path contains data that might be tainted");
break;
case ZEND_REQUIRE:
php_taint_error("function.require" TSRMLS_CC, "File path contains data that might be tainted");
break;
case ZEND_EVAL:
php_taint_error("function.eval" TSRMLS_CC, "Eval code contains data that might be tainted");
break;
}
return ZEND_USER_OPCODE_DISPATCH;
} /* }}} */
static int php_taint_concat_handler(ZEND_OPCODE_HANDLER_ARGS) /* {{{ */ {
zend_op *opline = execute_data->opline;
zval *op1 = NULL, *op2 = NULL, *result;
taint_free_op free_op1 = {0}, free_op2 = {0};
uint tainted = 0;
result = &TAINT_T(TAINT_RESULT_VAR(opline)).tmp_var;
switch(TAINT_OP1_TYPE(opline)) {
case IS_TMP_VAR:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data, &free_op1 TSRMLS_CC);
#else
op1 = php_taint_get_zval_ptr_tmp(TAINT_OP1_NODE_PTR(opline), execute_data->Ts, &free_op1 TSRMLS_CC);
#endif
break;
case IS_VAR:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
op1 = php_taint_get_zval_ptr_var(TAINT_OP1_NODE_PTR(opline), execute_data, &free_op1 TSRMLS_CC);
#else
op1 = php_taint_get_zval_ptr_var(TAINT_OP1_NODE_PTR(opline), execute_data->Ts, &free_op1 TSRMLS_CC);
#endif
break;
case IS_CV:
op1 = php_taint_get_zval_ptr_cv(TAINT_OP1_NODE_PTR(opline), TAINT_GET_ZVAL_PTR_CV_2ND_ARG(BP_VAR_R) TSRMLS_CC);
break;
case IS_CONST:
op1 = TAINT_OP1_CONSTANT_PTR(opline);
break;
}
switch(TAINT_OP2_TYPE(opline)) {
case IS_TMP_VAR:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
op2 = php_taint_get_zval_ptr_tmp(TAINT_OP2_NODE_PTR(opline), execute_data, &free_op2 TSRMLS_CC);
#else
op2 = php_taint_get_zval_ptr_tmp(TAINT_OP2_NODE_PTR(opline), execute_data->Ts, &free_op2 TSRMLS_CC);
#endif
break;
case IS_VAR:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION == 5)
op2 = php_taint_get_zval_ptr_var(TAINT_OP2_NODE_PTR(opline), execute_data, &free_op2 TSRMLS_CC);
#else
op2 = php_taint_get_zval_ptr_var(TAINT_OP2_NODE_PTR(opline), execute_data->Ts, &free_op2 TSRMLS_CC);
#endif
break;
case IS_CV:
op2 = php_taint_get_zval_ptr_cv(TAINT_OP2_NODE_PTR(opline), TAINT_GET_ZVAL_PTR_CV_2ND_ARG(BP_VAR_R) TSRMLS_CC);
break;
case IS_CONST:
op2 = TAINT_OP2_CONSTANT_PTR(opline);
break;
}
if ((op1 && IS_STRING == Z_TYPE_P(op1) && PHP_TAINT_POSSIBLE(op1))
|| (op2 && IS_STRING == Z_TYPE_P(op2) && PHP_TAINT_POSSIBLE(op2))) {
tainted = 1;
}
concat_function(result, op1, op2 TSRMLS_CC);
if (tainted && IS_STRING == Z_TYPE_P(result)) {
Z_STRVAL_P(result) = erealloc(Z_STRVAL_P(result), Z_STRLEN_P(result) + 1 + PHP_TAINT_MAGIC_LENGTH);
PHP_TAINT_MARK(result, PHP_TAINT_MAGIC_POSSIBLE);
}
switch(TAINT_OP1_TYPE(opline)) {
case IS_TMP_VAR:
zval_dtor(free_op1.var);
break;
case IS_VAR:
if (free_op1.var) {
zval_ptr_dtor(&free_op1.var);
}
break;
}
switch(TAINT_OP2_TYPE(opline)) {
case IS_TMP_VAR:
zval_dtor(free_op2.var);
break;
case IS_VAR:
if (free_op2.var) {
zval_ptr_dtor(&free_op2.var);
}
break;
}
execute_data->opline++;
return ZEND_USER_OPCODE_CONTINUE;
} /* }}} */
static zval **php_taint_fetch_dimension_address_inner(HashTable *ht, zval *dim, int dim_type, int type TSRMLS_DC) /* {{{ */ {
zval **retval;
char *offset_key;
int offset_key_length;
ulong hval;
switch (dim->type) {
case IS_NULL:
offset_key = "";
offset_key_length = 0;
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION > 3)
hval = zend_inline_hash_func("", 1);
#endif
goto fetch_string_dim;
case IS_STRING:
offset_key = dim->value.str.val;
offset_key_length = dim->value.str.len;
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION > 3)
if (dim_type == IS_CONST) {
hval = Z_HASH_P(dim);
} else {
ZEND_HANDLE_NUMERIC_EX(offset_key, offset_key_length+1, hval, goto num_index);
if (IS_INTERNED(offset_key)) {
hval = INTERNED_HASH(offset_key);
} else {
hval = zend_hash_func(offset_key, offset_key_length+1);
}
}
#endif
fetch_string_dim:
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
if (zend_symtable_find(ht, offset_key, offset_key_length+1, (void **) &retval) == FAILURE) {
#else
if (zend_hash_quick_find(ht, offset_key, offset_key_length+1, hval, (void **) &retval) == FAILURE) {
#endif
switch (type) {
case BP_VAR_R:
zend_error(E_NOTICE, "Undefined index: %s", offset_key);
/* break missing intentionally */
case BP_VAR_UNSET:
case BP_VAR_IS:
retval = &EG(uninitialized_zval_ptr);
break;
case BP_VAR_RW:
zend_error(E_NOTICE,"Undefined index: %s", offset_key);
/* break missing intentionally */
case BP_VAR_W: {
zval *new_zval = &EG(uninitialized_zval);
Z_ADDREF_P(new_zval);
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
zend_symtable_update(ht, offset_key, offset_key_length+1, &new_zval, sizeof(zval *), (void **) &retval);
#else
zend_hash_quick_update(ht, offset_key, offset_key_length+1, hval, &new_zval, sizeof(zval *), (void **) &retval);
#endif
}
break;
}
}
#if 0
}
#endif
break;
case IS_DOUBLE:
hval = zend_dval_to_lval(Z_DVAL_P(dim));
goto num_index;
case IS_RESOURCE:
zend_error(E_STRICT, "Resource ID#%ld used as offset, casting to integer (%ld)", Z_LVAL_P(dim), Z_LVAL_P(dim));
/* Fall Through */
case IS_BOOL:
case IS_LONG:
hval = Z_LVAL_P(dim);
num_index:
if (zend_hash_index_find(ht, hval, (void **) &retval) == FAILURE) {
switch (type) {
case BP_VAR_R:
zend_error(E_NOTICE,"Undefined offset: %ld", hval);
/* break missing intentionally */
case BP_VAR_UNSET:
case BP_VAR_IS:
retval = &EG(uninitialized_zval_ptr);
break;
case BP_VAR_RW:
zend_error(E_NOTICE,"Undefined offset: %ld", hval);
/* break missing intentionally */
case BP_VAR_W: {
zval *new_zval = &EG(uninitialized_zval);
Z_ADDREF_P(new_zval);
zend_hash_index_update(ht, hval, &new_zval, sizeof(zval *), (void **) &retval);
}
break;
}
}
break;
default:
zend_error(E_WARNING, "Illegal offset type");
return (type == BP_VAR_W || type == BP_VAR_RW) ?
&EG(error_zval_ptr) : &EG(uninitialized_zval_ptr);
}
return retval;
} /* }}} */
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
static void php_taint_fetch_dimension_address(temp_variable *result, zval **container_ptr, zval *dim, int dim_is_tmp_var, int type TSRMLS_DC)
#else
static void php_taint_fetch_dimension_address(temp_variable *result, zval **container_ptr, zval *dim, int dim_type, int type TSRMLS_DC)
#endif
{
zval *container = *container_ptr;
zval **retval;
switch (Z_TYPE_P(container)) {
case IS_ARRAY:
if (type != BP_VAR_UNSET && Z_REFCOUNT_P(container)>1 && !Z_ISREF_P(container)) {
SEPARATE_ZVAL(container_ptr);
container = *container_ptr;
}
fetch_from_array:
if (dim == NULL) {
zval *new_zval = &EG(uninitialized_zval);
Z_ADDREF_P(new_zval);
if (zend_hash_next_index_insert(Z_ARRVAL_P(container), &new_zval, sizeof(zval *), (void **) &retval) == FAILURE) {
zend_error(E_WARNING, "Cannot add element to the array as the next element is already occupied");
retval = &EG(error_zval_ptr);
Z_DELREF_P(new_zval);
}
} else {
#if (PHP_MAJOR_VERSION == 5) && (PHP_MINOR_VERSION < 4)
retval = php_taint_fetch_dimension_address_inner(Z_ARRVAL_P(container), dim, 0, type TSRMLS_CC);
#else
retval = php_taint_fetch_dimension_address_inner(Z_ARRVAL_P(container), dim, dim_type, type TSRMLS_CC);
#endif
}
result->var.ptr_ptr = retval;
Z_ADDREF_P(*retval);
return;
break;
case IS_NULL:
if (container == &EG(error_zval)) {
result->var.ptr_ptr = &EG(error_zval_ptr);
Z_ADDREF_P(EG(error_zval_ptr));
} else if (type != BP_VAR_UNSET) {
convert_to_array:
if (!Z_ISREF_P(container)) {
SEPARATE_ZVAL(container_ptr);
container = *container_ptr;
}
zval_dtor(container);
array_init(container);
goto fetch_from_array;
} else {
/* for read-mode only */
result->var.ptr_ptr = &EG(uninitialized_zval_ptr);
Z_ADDREF_P(EG(uninitialized_zval_ptr));
}
return;
break;
case IS_STRING: {
zval tmp;
if (type != BP_VAR_UNSET && Z_STRLEN_P(container)==0) {
goto convert_to_array;
}
if (dim == NULL) {
zend_error(E_ERROR, "[] operator not supported for strings");
return;
}
if (Z_TYPE_P(dim) != IS_LONG) {
switch(Z_TYPE_P(dim)) {
/* case IS_LONG: */
case IS_STRING:
if (IS_LONG == is_numeric_string(Z_STRVAL_P(dim), Z_STRLEN_P(dim), NULL, NULL, -1)) {
break;
}
if (type != BP_VAR_UNSET) {
zend_error(E_WARNING, "Illegal string offset '%s'", dim->value.str.val);
}
break;
case IS_DOUBLE:
case IS_NULL:
case IS_BOOL:
zend_error(E_NOTICE, "String offset cast occurred");
break;
default:
zend_error(E_WARNING, "Illegal offset type");
break;
}
tmp = *dim;
zval_copy_ctor(&tmp);
convert_to_long(&tmp);
dim = &tmp;
}
if (type != BP_VAR_UNSET) {
SEPARATE_ZVAL_IF_NOT_REF(container_ptr);
}