2021-09-28 11:30:14 +00:00
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let page s b =
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Printf.sprintf {|
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<html>
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<head>
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<title>WebAuthn Demo</title>
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<script type="text/javascript" src="/static/base64.js"></script>
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<script>
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function bufferEncode(value) {
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return base64js.fromByteArray(value)
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.replace(/\+/g, "-")
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.replace(/\//g, "_")
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.replace(/=/g, "");
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}
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</script>
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<script>%s</script>
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</head><body>%s</body></html>|} s b
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let overview notes authenticated_as users =
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let authenticated_as =
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match authenticated_as with
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| None -> "<h2>Not authenticated</h2>"
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| Some user -> Printf.sprintf {|<h2>Authenticated as %s</h2>
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<form action="/logout" method="post"><input type="submit" value="Log out"/></form>
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|} user
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and links =
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{|<h2>Register</h2><ul>
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<li><a href="/register">register</a></li>
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</ul>
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|}
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and users =
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String.concat ""
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("<h2>Users</h2><ul>" ::
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Hashtbl.fold (fun name keys acc ->
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let handles = List.map (fun (_, h, _) -> h) keys in
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(Printf.sprintf "<li>%s [<a href=/authenticate/%s>authenticate</a>] (%s)</li>" name name (String.concat ", " handles)) :: acc)
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users [] @ [ "</ul>" ])
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in
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page "" (String.concat "" (notes @ [authenticated_as;links;users]))
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2021-09-29 14:34:09 +00:00
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let register_view origin user challenge userid =
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2021-09-28 11:30:14 +00:00
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let script = Printf.sprintf {|
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var publicKey = {
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challenge: Uint8Array.from(window.atob("%s"), c=>c.charCodeAt(0)),
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rp: {
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2021-09-29 14:34:09 +00:00
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id: "%s",
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2021-09-28 11:30:14 +00:00
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name: "WebAuthn Demo from robur.coop"
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},
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user: {
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id: Uint8Array.from(window.atob("%s"), c=>c.charCodeAt(0)),
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displayName: "%s",
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name: "%s"
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},
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pubKeyCredParams: [
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{
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type: "public-key",
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alg: -7
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}
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2021-09-29 14:34:09 +00:00
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],
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attestation: "direct"
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2021-09-28 11:30:14 +00:00
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};
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navigator.credentials.create({ publicKey })
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.then(function (credential) {
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// send attestation response and client extensions
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// to the server to proceed with the registration
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// of the credential
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console.log(credential);
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// Move data into Arrays incase it is super long
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let response = credential.response;
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let attestationObject = new Uint8Array(response.attestationObject);
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let clientDataJSON = new Uint8Array(response.clientDataJSON);
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let rawId = new Uint8Array(credential.rawId);
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var body =
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JSON.stringify({
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id: credential.id,
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rawId: bufferEncode(rawId),
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type: credential.type,
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response: {
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attestationObject: bufferEncode(attestationObject),
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clientDataJSON: bufferEncode(clientDataJSON),
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},
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});
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console.log(body);
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let headers = {'Content-type': "application/json; charset=utf-8"};
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let request = new Request('/register_finish', { method: 'POST', body: body, headers: headers } );
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fetch(request)
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.then(function (response) {
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console.log(response);
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if (!response.ok) {
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console.log("bad response: " + response.status);
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};
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});
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}).catch(function (err) {
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console.error(err);
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});
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2021-09-29 14:34:09 +00:00
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|} challenge origin userid user user
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2021-09-28 11:30:14 +00:00
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and body =
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Printf.sprintf {|
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<p>Welcome %s.</p>
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|} user
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in
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page script body
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2021-09-29 14:34:09 +00:00
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let authenticate_view challenge credentials user =
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2021-09-28 11:30:14 +00:00
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let script =
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Printf.sprintf {|
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2021-09-29 14:34:09 +00:00
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var request_options = {
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challenge: Uint8Array.from(window.atob("%s"), c=>c.charCodeAt(0)),
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allowCredentials: %s.map(x => { x.id = Uint8Array.from(window.atob(x.id), c=>c.charCodeAt(0)); return x }),
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};
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navigator.credentials.get({ publicKey: request_options })
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.then(function (assertion) {
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console.log(assertion);
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let response = assertion.response;
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let rawId = new Uint8Array(assertion.rawId);
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let authenticatorData = new Uint8Array(assertion.response.authenticatorData);
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let clientDataJSON = new Uint8Array(assertion.response.clientDataJSON);
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let signature = new Uint8Array(assertion.response.signature);
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let userHandle = assertion.response.userHandle ? new Uint8Array(assertion.response.userHandle) : null;
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var body =
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JSON.stringify({
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id: assertion.id,
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rawId: bufferEncode(rawId),
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type: assertion.type,
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response: {
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authenticatorData: bufferEncode(authenticatorData),
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clientDataJSON: bufferEncode(clientDataJSON),
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signature: bufferEncode(signature),
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userHandle: userHandle ? bufferEncode(userHandle) : null,
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2021-09-28 11:30:14 +00:00
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}
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2021-09-29 14:34:09 +00:00
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});
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console.log(body);
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let headers = {'Content-type': "application/json; charset=utf-8"};
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let request = new Request('/authenticate_finish', { method: 'POST', body: body, headers: headers } );
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fetch(request)
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.then(function (response) {
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console.log(response);
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if (!response.ok) {
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console.log("bad response: " + response.status);
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};
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});
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}).catch(function (err) {
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console.error(err);
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});
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|} challenge
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(Yojson.to_string (`List
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(List.map (fun credential_id ->
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(`Assoc ["id", `String credential_id; "type", `String "public-key"]))
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credentials)))
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2021-09-28 11:30:14 +00:00
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and body =
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Printf.sprintf {|
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2021-09-29 14:34:09 +00:00
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<p>Touch your token to authenticate as %S.</p>
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2021-09-28 11:30:14 +00:00
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|} user
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in
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page script body
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