怎么实现一个php框架系列文章【5】安全处理输入-PHP Tutorial-php.cn

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怎么实现一个php框架系列文章【5】安全处理输入

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Jun 13, 2016 pm 12:28 PM

arraynbspreturnstringvar

如何实现一个php框架系列文章【5】安全处理输入

所有的外部输入参数都应该检查合法性。

未正确处理输入数据将可能导致sql注入等漏洞。

框架提供系列函数来取$_REQUEST中的值

requestInt

requestString

requestFloat

requestBool

ps：注意$_REQUEST中变量类型可能会是数组

如请求为 ?i[]=1，那么$_REQUEST['i'] 的值为array(1)

做校验的时候要考虑全面以防止php warning信息泄露

另外再介绍一下kv json格式的数据校验。

有时为了在项目中保留一定扩展性，会使用json格式的数据，这种数据又该如何校验呢。

//校验键值形式{k1:v1, k2:v2, k3:v3 ...}的json数据,可以对每一对kv进行校验

requestKvJson

部分实现代码

//校验整数，失败返回$default

function checkInt($var, $default = 0) {

return is_numeric($var) ? intval($var, (strncasecmp($var, '0x', 2) == 0 || strncasecmp($var, '-0x', 3) == 0) ? 16 : 10) : $default;

}

//校验字符串 $check为正则表达式

function checkString($var, $check = '', $default = '') {

if (!is_string($var)) {

if(is_numeric($var)) {

$var = (string)$var;

}

else {

return $default;

}

if ($check) {

return (preg_match($check, $var, $ret) ? $ret[1] : $default);

}

return $var;

}

/*

校验kv json，

如果想要一个这样的数据{id:1, 'type':'single_text', 'required': true, 'desc':'this is a text'}

那么$desc可以这样写

array(

array('id', 'Int'),

array('type', 'string', PATTERN_NORMAL_STRING),

array('required', 'Bool', false),

array('desc', 'string', PATTERN_NORMAL_STRING),

))

*/

function checkKvJson($var, $desc = array()) {

if(is_string($var)) {

$var = json_decode($var, true);

}

if(!$var || !is_array($var)) {

return array();

}

if($desc)

foreach($desc as $d) {

if(!isset($var[$d[0]])) {

return array();

}

$ps = array_slice($d, 2);

array_unshift($ps, $var[$d[0]]);

$var[$d[0]] = call_user_func_array('check'.$d[1], $ps);

if($var[$d[0]] === false && strcasecmp($d[1], 'Bool')) {

return array();

}

return $var;

}

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