commit e63d07bbd413c7558784898e2d9c1be3851cd65a
Author: Louis Burda <quent.burda@gmail.com>
Date: Fri, 10 May 2024 20:04:52 +0200
Add solution
Diffstat:
11 files changed, 1897 insertions(+), 0 deletions(-)
diff --git a/chall/Dockerfile b/chall/Dockerfile
@@ -0,0 +1,18 @@
+FROM node:18.10.0-slim
+
+ENV NODE_ENV=production
+
+RUN apt-get update && apt-get install -yq wget socat procps
+
+WORKDIR /app
+
+COPY ["package.json", "package-lock.json", "./"]
+
+# https://github.com/josephg/noisejs
+RUN wget https://raw.githubusercontent.com/josephg/noisejs/master/perlin.js
+
+RUN npm install --omit=dev
+
+COPY index.js .
+
+CMD socat -T 30 TCP-L:1337,fork,reuseaddr EXEC:"node index.js"
diff --git a/chall/docker-compose.yml b/chall/docker-compose.yml
@@ -0,0 +1,10 @@
+version: "3"
+
+services:
+ noise:
+ build: .
+ restart: always
+ environment:
+ - FLAG=SECCON{AAAAAAAAAAAAA}
+ ports:
+ - 1337:1337
diff --git a/chall/index.js b/chall/index.js
@@ -0,0 +1,98 @@
+const { noise } = require("./perlin.js");
+const sharp = require("sharp");
+const crypto = require("node:crypto");
+const readline = require("node:readline").promises;
+
+const FLAG = process.env.FLAG ?? console.log("No flag") ?? process.exit(1);
+const WIDTH = 256;
+const HEIGHT = 256;
+
+console.log(
+ ` _ _ _ ____ _
+ | \\ | | ___ (_)___ ___ / ___| ___ _ __ ___ _ __ __ _| |_ ___ _ __
+ | \\| |/ _ \\| / __|/ _ \\ | | _ / _ \\ '_ \\ / _ \\ '__/ _\` | __/ _ \\| '__|
+ | |\\ | (_) | \\__ \\ __/ | |_| | __/ | | | __/ | | (_| | || (_) | |
+ |_| \\_|\\___/|_|___/\\___| \\____|\\___|_| |_|\\___|_| \\__,_|\\__\\___/|_|
+ `
+);
+
+console.log(`Flag length: ${FLAG.length}`);
+console.log(`Image width: ${WIDTH}`);
+console.log(`Image height: ${HEIGHT}`);
+
+const paddedFlag = [
+ ...crypto.randomBytes(8), // random prefix
+ ...Buffer.from(FLAG),
+ ...crypto.randomBytes(8), // random suffix
+];
+
+// bytes_to_long
+let flagInt = 0n;
+for (const b of Buffer.from(paddedFlag)) {
+ flagInt = (flagInt << 8n) | BigInt(b);
+}
+
+const generateNoise = async (scaleX, scaleY) => {
+ const div = (x, y) => {
+ const p = 4;
+ return Number(BigInt.asUintN(32 + p, (x * BigInt(1 << p)) / y)) / (1 << p);
+ };
+
+ const offsetX = div(flagInt, scaleX);
+ const offsetY = div(flagInt, scaleY);
+
+ noise.seed(crypto.randomInt(65536));
+ const colors = [];
+ for (let y = 0; y < HEIGHT; y++) {
+ for (let x = 0; x < WIDTH; x++) {
+ let v = noise.perlin2(offsetX + x * 0.05, offsetY + y * 0.05);
+ v = (v + 1.0) * 0.5; // [-1, 1] -> [0, 1]
+ colors.push((v * 256) | 0);
+ }
+ }
+
+ const image = await sharp(Uint8Array.from(colors), {
+ raw: {
+ width: WIDTH,
+ height: HEIGHT,
+ channels: 1,
+ },
+ })
+ .webp({ lossless: true })
+ .toBuffer();
+ return image;
+};
+
+const main = async () => {
+ const rl = readline.createInterface({
+ input: process.stdin,
+ output: process.stdout,
+ terminal: false,
+ });
+
+ const toBigInt = (value) => {
+ if (value.length > 100) {
+ console.log(`Invalid value: ${value}`);
+ process.exit(1);
+ }
+ const result = BigInt(value);
+ if (result <= 0n) {
+ console.log(`Invalid value: ${value}`);
+ process.exit(1);
+ }
+ return result;
+ };
+
+ const query = async () => {
+ const scaleX = toBigInt(await rl.question("Scale x: "));
+ const scaleY = toBigInt(await rl.question("Scale y: "));
+
+ const image = await generateNoise(scaleX, scaleY);
+ console.log(image.toString("base64"));
+ };
+ await query();
+
+ rl.close();
+};
+
+main();
diff --git a/chall/package-lock.json b/chall/package-lock.json
@@ -0,0 +1,826 @@
+{
+ "name": "noise",
+ "version": "1.0.0",
+ "lockfileVersion": 2,
+ "requires": true,
+ "packages": {
+ "": {
+ "name": "noise",
+ "version": "1.0.0",
+ "dependencies": {
+ "sharp": "^0.31.1"
+ }
+ },
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+ "funding": [
+ {
+ "type": "github",
+ "url": "https://github.com/sponsors/feross"
+ },
+ {
+ "type": "patreon",
+ "url": "https://www.patreon.com/feross"
+ },
+ {
+ "type": "consulting",
+ "url": "https://feross.org/support"
+ }
+ ]
+ },
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+}
diff --git a/chall/package.json b/chall/package.json
@@ -0,0 +1,9 @@
+{
+ "name": "noiseccon",
+ "version": "1.0.0",
+ "main": "index.js",
+ "private": true,
+ "dependencies": {
+ "sharp": "^0.31.1"
+ }
+}
diff --git a/solve/findoff.js b/solve/findoff.js
@@ -0,0 +1,50 @@
+const { noise } = require("./perlin.js");
+const { argv } = require("process");
+const crypto = require("node:crypto");
+const sharp = require("sharp");
+const fs = require("fs");
+
+const WIDTH = 256;
+const HEIGHT = 256;
+
+const main = async() => {
+ var buffer = fs.readFileSync("tmp.webp")
+ const image = await sharp(buffer, {
+ webp: {
+ width: WIDTH,
+ height: HEIGHT,
+ channels: 1
+ }
+ }).raw().toBuffer()
+ var ivals = Uint8Array.from(image);
+ console.log(ivals.length, 256 * 256 * 3)
+
+ for (let seed = 0; seed < 65536; seed++) {
+ noise.seed(seed);
+ //let ox = parseInt(argv[2]);
+ for (let ox = 0; ox < 256; ox++) {
+ //let p = parseInt(argv[3]);
+ //console.log(p);
+ for (let p = 0; p < 16; p++) {
+ let match = true;
+ for (let y = 0; y < 40; y++) {
+ for (let x = 0; x < 40; x++) {
+ let v = noise.perlin2(ox + p * 0.0625 + x * 0.05, y * 0.05);
+ v = (v + 1.0) * 0.5;
+ v = (v * 256) | 0;
+ if (ivals[(y * 256 + x) * 3] != v) {
+ match = false;
+ break;
+ }
+ }
+ if (!match)
+ break;
+ }
+ if (match)
+ console.log("IDX", ox);
+ }
+ }
+ }
+}
+
+main();
diff --git a/solve/flag b/solve/flag
@@ -0,0 +1 @@
+SECCON{p3RLin_W0r1d!}
diff --git a/solve/notes b/solve/notes
@@ -0,0 +1,5 @@
+reverse perlin noise generation to get offsetX and offsetY
+set offsetX and offsetY so we can recover flag without padding (1 << 8, 1 << FLAGLEN-8)
+
+actually one request only reveals one byte since the grid repeats every 256..
+so using scaleX = (i + 1) << 8 and scaleY = (i + 2) << 8
diff --git a/solve/package-lock.json b/solve/package-lock.json
@@ -0,0 +1,826 @@
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+ }
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+ "funding": [
+ {
+ "type": "github",
+ "url": "https://github.com/sponsors/feross"
+ },
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+ "type": "patreon",
+ "url": "https://www.patreon.com/feross"
+ },
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+ "type": "consulting",
+ "url": "https://feross.org/support"
+ }
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+ "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+ "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+ }
+ }
+}
diff --git a/solve/package.json b/solve/package.json
@@ -0,0 +1,9 @@
+{
+ "name": "noiseccon",
+ "version": "1.0.0",
+ "main": "index.js",
+ "private": true,
+ "dependencies": {
+ "sharp": "^0.31.1"
+ }
+}
diff --git a/solve/solve.py b/solve/solve.py
@@ -0,0 +1,45 @@
+from pwn import *
+from base64 import b64decode
+import subprocess
+
+def extract_char(index):
+ io = remote("localhost", 1337)
+
+ scalex = 1 << (64 + index * 8)
+ scaley = "9" * 100
+
+ io.readuntil(b"Flag length: ")
+ flaglen = int(io.readline())
+
+ io.readuntil(b"Image width: ")
+ width = int(io.readline())
+
+ io.readuntil(b"Image height: ")
+ height = int(io.readline())
+
+ print(flaglen, width, height)
+
+ io.readuntil(b"Scale x: ")
+ io.sendline(str(scalex).encode())
+
+ io.readuntil(b"Scale y: ")
+ io.sendline(str(scaley).encode())
+
+ data = b64decode(io.readline().strip())
+ with open("tmp.webp", "wb+") as f:
+ f.write(data)
+ io.close()
+
+ output = subprocess.check_output(["node", "findoff.js"])
+ indexlines = [l for l in output.split(b"\n") if l.startswith(b"IDX ")]
+ indexes = set([int(l.split()[1]) for l in indexlines])
+ print(len(indexes), indexes)
+
+ return chr(list(indexes)[0])
+
+flag = ""
+for i in range(40):
+ if flag.startswith("SECCON"):
+ break
+ flag = extract_char(i) + flag
+print(flag)
