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문제) 할로윈 파티를 기념하기 위해 호박을 준비했습니다!
호박을 10000번 클릭하고 플래그를 획득하세요!
(해당 문제는 Dreamhack CTF Season 1 Round #2에 출제된 문제입니다.)
호박을 10000번 클릭하면 FLAG를 얻을 수 있다.
이 문제를 보고 제일 먼저 생각한건 "매크로를 사용하면 1분도 안 걸릴텐데" 였다.
하지만 이 문제의 출제자가 의도한 풀이는 아닐테니 HTML 코드를 보자.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>do you want to build a jack-o-lantern?</title>
<style>
html, body { margin: 0; padding: 0; width: 100%; height: 100%; }
.jack { display: flex; flex-direction: column; align-items: center; justify-content: center; width: 100%; height: 100%; }
.jack svg { width: 50%; cursor: pointer; }
#jack-target { cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='42' height='50' viewport='0 0 100 100' style='fill:black;font-size:25px;'><text y='50%'>🗡️</text></svg>") 16 0, auto; }
.tada { animation: 1s tada infinite; }
@keyframes tada {
0% { transform: scale(1); }
50% { transform: scale(1.1); }
100% { transform: scale(1); }
}
</style>
</head>
<body>
<div class="jack">
<h1>click the pumpkin to make a jack-o-lantern!</h1>
<!-- openmoji.org -->
<svg id="jack-target" viewBox="0 0 72 72" version="1.1" xmlns="http://www.w3.org/2000/svg">
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<path fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="2" d="M27.0273,19.7574c0.0035-0.0016,0.0067-0.0037,0.0102-0.0053c-0.1246-0.0449-0.2475-0.0787-0.3715-0.1198 c-0.1494-0.0496-0.2989-0.1002-0.4474-0.1443c-0.1768-0.0525-0.3522-0.0975-0.5277-0.1425 c-0.1491-0.0382-0.2983-0.0776-0.4464-0.1104c-0.1727-0.0383-0.344-0.0692-0.5154-0.1003 c-0.1483-0.0269-0.2969-0.0552-0.4442-0.0767c-0.1689-0.0247-0.3361-0.0422-0.5035-0.0601 c-0.1472-0.0157-0.2947-0.0329-0.4409-0.0434c-0.1648-0.0119-0.3279-0.0167-0.4912-0.022 c-0.1456-0.0048-0.2914-0.011-0.4358-0.0107c-0.1622,0.0004-0.3224,0.0078-0.483,0.0145c-0.1425,0.006-0.2852,0.0103-0.4263,0.0211 c-0.1594,0.0123-0.317,0.0314-0.4747,0.0498c-0.1393,0.0162-0.2791,0.0308-0.4171,0.0517 c-0.1565,0.0237-0.3108,0.0543-0.4655,0.0839c-0.136,0.0261-0.2724,0.0503-0.4069,0.0808 c-0.1541,0.035-0.3059,0.0767-0.4581,0.1175c-0.1318,0.0353-0.2641,0.0686-0.3945,0.1082 c-0.1519,0.0461-0.3011,0.0988-0.451,0.1504c-0.1271,0.0438-0.2549,0.0856-0.3805,0.1334 c-0.1497,0.0569-0.2968,0.1205-0.4443,0.183c-0.1223,0.0518-0.2452,0.1014-0.3659,0.1569 c-0.1479,0.0679-0.2928,0.1423-0.4384,0.2157c-0.1165,0.0587-0.2339,0.1152-0.3488,0.1773 c-0.1458,0.0788-0.2886,0.1639-0.4318,0.248c-0.1111,0.0652-0.2231,0.1281-0.3327,0.1964 c-0.1434,0.0894-0.2835,0.1851-0.4242,0.2797c-0.1055,0.0709-0.2121,0.1396-0.316,0.2134 c-0.1414,0.1003-0.2792,0.2067-0.4177,0.3123c-0.0989,0.0754-0.1992,0.1484-0.2966,0.2263 c-0.1387,0.1109-0.2736,0.2277-0.4092,0.3436c-0.0936,0.08-0.1886,0.1577-0.2807,0.24c-0.135,0.1207-0.2662,0.2471-0.3979,0.3727 c-0.088,0.0839-0.1776,0.1655-0.2642,0.2515c-0.1327,0.1318-0.2612,0.269-0.3904,0.4057c-0.0812,0.0858-0.1639,0.1693-0.2437,0.257 c-0.1293,0.1422-0.2543,0.2896-0.3798,0.4365c-0.0754,0.0881-0.1525,0.1739-0.2264,0.2637"/>
<g id="jack-mouth" style="opacity: 0;">
<path fill="#FCEA2B" d="M20,48c0,0,15,10,32,0C52,48,36,68,20,48z"/>
<path fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="2" d="M20,48c0,0,15,10,32,0C52,48,36,68,20,48z"/>
</g>
<g id="jack-nose" style="opacity: 0;">
<polygon fill="#FCEA2B" points="35.896,47.9282 34.1847,44.9641 32.4734,42 35.896,42 39.3187,42 37.6073,44.9641"/>
<polygon fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="2" points="35.896,47.9282 34.1847,44.9641 32.4734,42 35.896,42 39.3187,42 37.6073,44.9641"/>
</g>
<g id="jack-right" style="opacity: 0;">
<path fill="#FCEA2B" d="M48.974,37.8449c2.5901-0.9575,3.9136-3.8335,2.956-6.4235l-9.3796,3.4675 C43.508,37.479,46.3839,38.8024,48.974,37.8449z"/>
<path fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="2" d="M48.974,37.8449c2.5901-0.9575,3.9136-3.8335,2.956-6.4235l-9.3796,3.4675C43.508,37.479,46.3839,38.8024,48.974,37.8449z"/>
</g>
<g id="jack-left" style="opacity: 0;">
<path fill="#FCEA2B" d="M22.818,37.8449c-2.5901-0.9575-3.9136-3.8335-2.956-6.4235l9.3796,3.4675 C28.2841,37.479,25.4081,38.8024,22.818,37.8449z"/>
<path fill="none" stroke="#000000" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" stroke-width="2" d="M22.818,37.8449c-2.5901-0.9575-3.9136-3.8335-2.956-6.4235l9.3796,3.4675C28.2841,37.479,25.4081,38.8024,22.818,37.8449z"/>
</g>
</svg>
<canvas width=720>
<div class="txtStyle"></div>
</canvas>
<p><span id="clicks">10000</span> more clicks to go!</p>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js" integrity="sha512-bLT0Qm9VnAYZDflyKcBaQ2gg0hSYNQrJ8RilYldYQ1FxQYoCLtUjuuRuZo+fjqhx/qtq/1itJ0C2ejDxltZVFg==" crossorigin="anonymous"></script>
<script>
var pumpkin = [ 124, 112, 59, 73, 167, 100, 105, 75, 59, 23, 16, 181, 165, 104, 43, 49, 118, 71, 112, 169, 43, 53 ];
var counter = 0;
var pie = 1;
function make() {
if (0 < counter && counter <= 1000) {
$('#jack-nose').css('opacity', (counter) + '%');
}
else if (1000 < counter && counter <= 3000) {
$('#jack-left').css('opacity', (counter - 1000) / 2 + '%');
}
else if (3000 < counter && counter <= 5000) {
$('#jack-right').css('opacity', (counter - 3000) / 2 + '%');
}
else if (5000 < counter && counter <= 10000) {
$('#jack-mouth').css('opacity', (counter - 5000) / 5 + '%');
}
if (10000 < counter) {
$('#jack-target').addClass('tada');
var ctx = document.querySelector("canvas").getContext("2d"),
dashLen = 220, dashOffset = dashLen, speed = 20,
txt = pumpkin.map(x=>String.fromCharCode(x)).join(''), x = 30, i = 0;
ctx.font = "50px Comic Sans MS, cursive, TSCu_Comic, sans-serif";
ctx.lineWidth = 5; ctx.lineJoin = "round"; ctx.globalAlpha = 2/3;
ctx.strokeStyle = ctx.fillStyle = "#1f2f90";
(function loop() {
ctx.clearRect(x, 0, 60, 150);
ctx.setLineDash([dashLen - dashOffset, dashOffset - speed]); // create a long dash mask
dashOffset -= speed; // reduce dash length
ctx.strokeText(txt[i], x, 90); // stroke letter
if (dashOffset > 0) requestAnimationFrame(loop); // animate
else {
ctx.fillText(txt[i], x, 90); // fill final letter
dashOffset = dashLen; // prep next char
x += ctx.measureText(txt[i++]).width + ctx.lineWidth * Math.random();
ctx.setTransform(1, 0, 0, 1, 0, 3 * Math.random()); // random y-delta
ctx.rotate(Math.random() * 0.005); // random rotation
if (i < txt.length) requestAnimationFrame(loop);
}
})();
}
else {
$('#clicks').text(10000 - counter);
}
}
$(function() {
$('#jack-target').click(function () {
counter += 1;
if (counter <= 10000 && counter % 100 == 0) {
for (var i = 0; i < pumpkin.length; i++) {
pumpkin[i] ^= pie;
pie = ((pie ^ 0xff) + (i * 10)) & 0xff;
}
}
make();
});
});
</script>
</body>
</html>
코드를 봤을 때 일정 횟수 클릭 시 마다 호박의 디자인이 추가되며,
실제로 10000번의 click trigger가 발생되야만 FLAG가 출력되는것을 확인할 수 있다.
나는 크롬 드라이버 (개발자도구)의 console 기능을 사용하여 반복문을 처리하는 방법을 선택했다.
html 파일에서 확인한 호박 식별자, click method를 활용해 간단한 for문을 작성했다.
for(i=1; i<=9999; i++){
$('#jack-target').trigger("click")}
이 코드를 console에서 실행하면, 호박은 9999번의 클릭이 진행된 상태로 바뀌고,
실제로는 단 1번의 클릭만 하면 된다.
남은 1번의 click을 진행하니 FLAG를 획득할 수 있었다.
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