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如何实现一个php框架系列文章【5】安全处理输入,
Jun 13, 2016 am 08:46 AM
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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$_REQUEST['i'] 的值为array(1)
做校验的时候要考虑全面以防止php warning信息泄露
另外再介绍一下kv json格式的数据校验。
有时为了在项目中保留一定扩展性,会使用json格式的数据,这种数据又该如何校验呢。
//校验键值形式{k1:v1, k2:v2, k3:v3 ...}的json数据,可以对每一对kv进行校验
requestKvJson
部分实现代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 |
//校验整数,失败返回$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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