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4 Commits
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2d477bb77e
| Author | SHA1 | Date |
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 Jacob Kiers
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2d477bb77e | |
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Jacob Kiers
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4b117a4743 | |
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Jacob Kiers
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74619915ca | |
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Jacob Kiers
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727f2c671e |
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@ -73,7 +73,7 @@ In short: just because I could. It was one of those ideas I was wondering idly a
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### Has it any practical use?
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It is not intended to have any. Since DNS records are fairly small, serving images or something would quickly start
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consuming 100s of requests per second. I wouldn't want to do that to Cloudflare 😉
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consuming 100s of requests per second. I wouldn't want to do that to Cloudflare.
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It would be an interesting experiment to see how feasible that is.
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@ -0,0 +1,21 @@
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class Verifier {
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/***
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* @param content Content
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*/
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async verify(content) {
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if (!window.isSecureContext) return;
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if (typeof TextEncoder === "undefined") return;
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if (typeof crypto === "undefined") return;
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const encoder = new TextEncoder();
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const digestBuffer = await crypto.subtle.digest(content.index.hashAlgorithm, encoder.encode(content.content));
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const hashArray = Array.from(new Uint8Array(digestBuffer)); // convert buffer to byte array
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const digest = hashArray.map(b => b.toString(16).padStart(2, '0')).join(''); // convert bytes to hex string
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if (content.index.hash === digest) {
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document.getElementById("verification").innerHTML =
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"The hash of the content is verified to correspond with the hash" +
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" in the metadata. You are now reading exactly what was intended.";
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}
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}
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}
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79
index.html
79
index.html
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@ -1,8 +1,8 @@
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<!DOCTYPE html charset="UTF-8">
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<html>
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Blog over DNS</title>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.2.0/build/styles/default.min.css">
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<script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.2.0/build/highlight.min.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
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@ -10,13 +10,20 @@
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class Content {
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content = "";
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type = "";
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metaData = {}
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metaData = {};
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index;
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constructor(content, type, metaData = {})
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/***
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* @param content string
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* @param type string
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* @param index Index
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*/
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constructor(content, type, index)
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{
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this.content = content;
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this.type = type;
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this.metaData = metaData;
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this.index = index;
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this.metaData = index.metaData;
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}
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}
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@ -24,13 +31,15 @@ class Index
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{
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mimeType = "";
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chunks = 0;
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hashAlgorithm = "";
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hash = "";
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metaData = {};
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constructor(mimeType, chunks, hash, metaData = {})
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constructor(mimeType, chunks, hash, hashAlgorithm, metaData = {})
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{
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this.mimeType = mimeType;
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this.chunks = chunks;
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this.hashAlgorithm = hashAlgorithm;
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this.hash = hash;
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this.metaData = metaData
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}
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@ -40,7 +49,7 @@ const dohServer = "https://cloudflare-dns.com/dns-query?ct=application/dns-json&
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const baseDomain = "hod.experiments.jacobkiers.net";
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async function readUrl(domain) {
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var index = await fetchIndex(`${dohServer}${domain}.${baseDomain}`);
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var index = await fetchIndex(`${domain}.${baseDomain}`);
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var chunk_promises = [];
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for(i = 0; i < index.chunks; i++)
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@ -48,28 +57,31 @@ async function readUrl(domain) {
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chunk_promises[i] = fetchChunk(i, index.hash);
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}
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var chunks = await Promise.all(chunk_promises);
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var content = chunks.reduce((built, current) => built += current);
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const chunks = await Promise.all(chunk_promises);
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const base64 = chunks.reduce((built, current) => built += current);
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return handleContent(new Content(atob(content), index.mimeType, index.metaData));
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const content = atob(base64);
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return handleContent(new Content(content, index.mimeType, index));
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}
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async function fetchChunk(id, hash)
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{
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var domain = `${id}.${hash}.${baseDomain}`;
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const json = await fetch(`${dohServer}${domain}`)
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const domain = `${id}.${hash}.${baseDomain}`;
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return await fetchData(domain);
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}
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async function fetchData(domain)
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{
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const json = await fetch(`${dohServer}${domain}`)
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.then(response => response.json());
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const data = json.Answer[0].data.slice(1, -1);
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const raw_data = json.Answer[0].data;
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const data = raw_data.replaceAll(/[\s\"]/g, '');
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return data;
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}
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async function fetchIndex(domain)
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{
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const response = await fetch(`${dohServer}.${domain}`);
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const json = await response.json();
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const index = json.Answer[0].data.slice(1, -1);
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const index = await fetchData(domain);
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let ret = {};
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let items = index.split(';');
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@ -82,7 +94,7 @@ async function fetchIndex(domain)
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});
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const metadata = JSON.parse(atob(ret["m"]));
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return new Index(ret["t"], ret["c"], ret["h"], metadata);
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return new Index(ret["t"], ret["c"], ret["h"], ret["ha"], metadata);
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}
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function handleContent(content)
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@ -108,7 +120,12 @@ function handleContent(content)
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function handleJavascript(content)
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{
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console.log("Got some javascript!", content.content);
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console.log("Got some javascript!");
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const scripts = document.getElementById("scripts");
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const new_script = document.createElement("script");
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new_script.text = content.content;
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scripts.appendChild(new_script);
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}
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async function handleMarkdown(content)
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@ -126,20 +143,28 @@ async function handleMarkdown(content)
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let title = document.createElement("h1");
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title.innerHTML = content.metaData.title;
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document.getElementById("post").prepend(title)
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document.getElementById("nojs").style.visibility = "hidden";
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document.getElementById("nojs").remove();
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if (typeof Verifier !== "undefined") {
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await (new Verifier()).verify(content);
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}
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}
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</script>
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</head>
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<body>
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<script>
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readUrl("posts-2021-08-17-serving-blog-content-over-dns-md");
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</script>
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<div id="post"></div>
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<div id="post"></div>
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<div id="verification"></div>
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<div id="nojs">
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<h1>HTML over DNS</h1>
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<p>The content of this page is fetched using DNS over HTTP. Since that requires Javascript, please enable that to see the content.</p>
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</div>
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<div id="scripts">
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<script>
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readUrl("scripts-verifier-js").then(
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() => readUrl("posts-2021-08-17-serving-blog-content-over-dns-md")
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);
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</script>
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</div>
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</body>
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</html>
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@ -1,7 +1,7 @@
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;
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$TTL 5m ; Default TTL
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@ IN SOA home.kie.rs. postmaster.kie.rs. (
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2021081611 ; serial
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@ IN SOA experiments.jacobkiers.net. postmaster.kie.rs. (
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2021082004 ; serial
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1h ; slave refresh interval
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15m ; slave retry interval
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1w ; slave copy expire time
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@ -13,7 +13,7 @@ $ORIGIN hod.experiments.jacobkiers.net.
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;
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; domain name servers
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;
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@ IN NS home.kie.rs.
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@ IN NS experiments.jacobkiers.net.
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;; START BLOG RECORDS
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