From 642f3e2e5f1ad32d697c093d42267d1a5738617a Mon Sep 17 00:00:00 2001
From: Julian Rother <julianr@fsmpi.rwth-aachen.de>
Date: Fri, 2 Oct 2020 22:21:00 +0200
Subject: [PATCH] added webauthn support
Code is mostly based on python-fido2's example code. Note that webauthn
requires the website to be delivered via HTTPS. Flask's development server
automatically sets up a self-signed ssl cert with the `ssl_context="adhoc"`
option.
---
README.md | 1 +
uffd/mfa/models.py | 24 +-
uffd/mfa/templates/auth.html | 68 ++++-
uffd/mfa/templates/setup.html | 13 +-
uffd/mfa/templates/setup_webauthn.html | 65 ++++
uffd/mfa/views.py | 112 ++++++-
uffd/static/cbor.js | 406 +++++++++++++++++++++++++
7 files changed, 679 insertions(+), 10 deletions(-)
create mode 100644 uffd/mfa/templates/setup_webauthn.html
create mode 100644 uffd/static/cbor.js
diff --git a/README.md b/README.md
index 2ca0bf7a..810a27b7 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ A web service to manage LDAP users, groups and permissions.
- python3-flask
- python3-flask-sqlalchemy
- python3-qrcode
+- python3-fido2
- git (cli utility, musst be in path)
## development
diff --git a/uffd/mfa/models.py b/uffd/mfa/models.py
index d30338b5..547ae579 100644
--- a/uffd/mfa/models.py
+++ b/uffd/mfa/models.py
@@ -3,13 +3,16 @@ import datetime
import secrets, time, struct, hmac, hashlib, base64, urllib.parse
from flask import request, current_app
-from sqlalchemy import Column, Integer, Enum, Boolean, String, DateTime
+from sqlalchemy import Column, Integer, Enum, Boolean, String, DateTime, Text
+
+from fido2.ctap2 import AuthenticatorData
from uffd.database import db
from uffd.user.models import User
class MFAType(enum.Enum):
TOTP = 1
+ WEBAUTHN = 2
class MFAMethod(db.Model):
__tablename__ = 'mfa_method'
@@ -91,3 +94,22 @@ class TOTPMethod(MFAMethod):
return True
return False
+class WebauthnMethod(MFAMethod):
+ _cred = Column('webauthn_cred', Text())
+
+ __mapper_args__ = {
+ 'polymorphic_identity': MFAType.WEBAUTHN
+ }
+
+ def __init__(self, user, cred_data, name=None):
+ super().__init__(user, name)
+ self.cred_data = cred_data
+
+ @property
+ def cred_data(self):
+ return AuthenticatorData(base64.b64decode(self._cred))
+
+ @cred_data.setter
+ def cred_data(self, d):
+ self._cred = base64.b64encode(bytes(d))
+
diff --git a/uffd/mfa/templates/auth.html b/uffd/mfa/templates/auth.html
index 176bff26..d5d9a652 100644
--- a/uffd/mfa/templates/auth.html
+++ b/uffd/mfa/templates/auth.html
@@ -1,6 +1,7 @@
{% extends 'base.html' %}
{% block body %}
+
<form action="{{ url_for("mfa.auth_finish", ref=ref) }}" method="POST">
<div class="row mt-2 justify-content-center">
<div class="col-lg-6 col-md-10" style="background: #f7f7f7; box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.3); padding: 30px;">
@@ -10,8 +11,20 @@
<div class="col-12">
<h2 class="text-center">Two-Factor Authentication</h2>
</div>
+ {% if webauthn_methods %}
+ <div class="form-group col-12 d-none webauthn-group">
+ <div id="webauthn-alert" class="alert alert-warning d-none" role="alert">
+ </div>
+ <label for="webauthn-btn">FIDO token</label>
+ <button type="button" id="webauthn-btn" class="btn btn-primary btn-block">
+ <span id="webauthn-spinner" class="spinner-border spinner-border-sm d-none" role="status" aria-hidden="true"></span>
+ <span id="webauthn-btn-text">Authenticate with FIDO token</span>
+ </button>
+ </div>
+ <div class="text-center text-muted d-none webauthn-group">- or -</div>
+ {% endif %}
<div class="form-group col-12">
- <label for="mfa-code">Two-factor authentication code</label>
+ <label for="mfa-code">Authentication code</label>
<input type="text" class="form-control" id="mfa-code" name="code" required="required" tabindex="1">
</div>
<div class="form-group col-12">
@@ -20,4 +33,57 @@
</div>
</div>
</form>
+
+{% if webauthn_methods %}
+<script src="{{ url_for('static', filename="cbor.js") }}"></script>
+<script>
+function begin_webauthn() {
+ $('#webauthn-alert').addClass('d-none');
+ $('#webauthn-spinner').removeClass('d-none');
+ $('#webauthn-btn-text').text('Fetching credential data');
+ $('#webauthn-btn').prop('disabled', true);
+ fetch({{ url_for('mfa.auth_webauthn_begin')|tojson }}, {
+ method: 'POST',
+ }).then(function(response) {
+ if(response.ok) return response.arrayBuffer();
+ throw new Error('No credential available to authenticate!');
+ }).then(CBOR.decode).then(function(options) {
+ $('#webauthn-btn-text').text('Waiting for response from your device');
+ return navigator.credentials.get(options);
+ }).then(function(assertion) {
+ $('#webauthn-btn-text').text('Verifing response');
+ return fetch({{ url_for('mfa.auth_webauthn_begin')|tojson }}, {
+ method: 'POST',
+ headers: {'Content-Type': 'application/cbor'},
+ body: CBOR.encode({
+ "credentialId": new Uint8Array(assertion.rawId),
+ "authenticatorData": new Uint8Array(assertion.response.authenticatorData),
+ "clientDataJSON": new Uint8Array(assertion.response.clientDataJSON),
+ "signature": new Uint8Array(assertion.response.signature)
+ })
+ })
+ }).then(function(response) {
+ if (response.ok) {
+ $('#webauthn-spinner').addClass('d-none');
+ $('#webauthn-btn-text').text('Success, redirecting');
+ window.location = {{ (ref or url_for('index'))|tojson }};
+ } else {
+ throw new Error('Response from authenticator rejected');
+ }
+ }, function(reason) {
+ $('#webauthn-alert').text('Authentication with your FIDO token failed!');
+ $('#webauthn-alert').removeClass('d-none');
+ $('#webauthn-spinner').addClass('d-none');
+ $('#webauthn-btn-text').text('Try FIDO token again');
+ $('#webauthn-btn').prop('disabled', false);
+ });
+}
+
+$('#webauthn-btn').on('click', begin_webauthn);
+if (typeof(PublicKeyCredential) != "undefined") {
+ $('.webauthn-group').removeClass('d-none');
+}
+</script>
+{% endif %}
+
{% endblock %}
diff --git a/uffd/mfa/templates/setup.html b/uffd/mfa/templates/setup.html
index f7f47241..b09bd47d 100644
--- a/uffd/mfa/templates/setup.html
+++ b/uffd/mfa/templates/setup.html
@@ -4,9 +4,10 @@
<div class="btn-toolbar">
<a class="btn btn-primary mb-2 ml-auto" href="{{ url_for('mfa.setup_totp') }}">Setup TOTP</a>
+ <a class="btn btn-primary mb-2 ml-2" href="{{ url_for('mfa.setup_webauthn') }}">Setup FIDO</a>
</div>
-{% if methods %}
+{% if totp_methods or webauthn_methods %}
<table class="table">
<thead>
<tr>
@@ -16,7 +17,7 @@
</tr>
</thead>
<tbody>
- {% for method in methods %}
+ {% for method in totp_methods %}
<tr>
<td style="width: 0.5em;"><i class="fas fa-mobile-alt"></i></td>
<td>{{ method.name }}</td>
@@ -24,6 +25,14 @@
<td><a class="btn btn-sm btn-danger float-right" href="{{ url_for('mfa.delete_totp', id=method.id) }}">Delete</a></td>
</tr>
{% endfor %}
+ {% for method in webauthn_methods %}
+ <tr>
+ <td style="width: 0.5em;"><i class="fab fa-usb"></i></td>
+ <td>{{ method.name }}</td>
+ <td>{{ method.created }}</td>
+ <td><a class="btn btn-sm btn-danger float-right" href="{{ url_for('mfa.delete_webauthn', id=method.id) }}">Delete</a></td>
+ </tr>
+ {% endfor %}
</tbody>
</table>
{% else %}
diff --git a/uffd/mfa/templates/setup_webauthn.html b/uffd/mfa/templates/setup_webauthn.html
new file mode 100644
index 00000000..3a143156
--- /dev/null
+++ b/uffd/mfa/templates/setup_webauthn.html
@@ -0,0 +1,65 @@
+{% extends 'base.html' %}
+
+{% block body %}
+
+<div id="register-alert" class="alert alert-warning d-none" role="alert"></div>
+
+<form action="{{ url_for('mfa.setup_webauthn') }}" method="POST" class="form">
+<div class="form-group">
+ <label for="name">Authenticator Name</label>
+ <input name="name" type="text" id="method-name" class="form-control" required="required">
+</div>
+<div class="form-group">
+ <button type="submit" id="register-btn" class="btn btn-primary btn-block">
+ <span id="register-spinner" class="spinner-border spinner-border-sm d-none" role="status" aria-hidden="true"></span>
+ <span id="register-btn-text">Register token</span>
+ </button>
+</div>
+</form>
+
+<script src="{{ url_for('static', filename="cbor.js") }}"></script>
+<script>
+
+$('form').on('submit', function(e) {
+ $('#register-alert').addClass('d-none');
+ $('#register-spinner').removeClass('d-none');
+ $('#register-btn-text').text('Contacting server');
+ $('#register-btn').prop('disabled', true);
+ fetch({{ url_for('mfa.setup_webauthn_begin')|tojson }}, {
+ method: 'POST',
+ }).then(function(response) {
+ if(response.ok) return response.arrayBuffer();
+ throw new Error('Error getting registration data!');
+ }).then(CBOR.decode).then(function(options) {
+ $('#register-btn-text').text('Waiting for response from your device');
+ return navigator.credentials.create(options);
+ }).then(function(attestation) {
+ return fetch({{ url_for('mfa.setup_webauthn_complete')|tojson }}, {
+ method: 'POST',
+ headers: {'Content-Type': 'application/cbor'},
+ body: CBOR.encode({
+ "attestationObject": new Uint8Array(attestation.response.attestationObject),
+ "clientDataJSON": new Uint8Array(attestation.response.clientDataJSON),
+ "name": $('#method-name').val()
+ })
+ });
+ }).then(function(response) {
+ if (response.ok) {
+ $('#register-spinner').addClass('d-none');
+ $('#register-btn-text').text('Success');
+ window.location = {{ url_for('mfa.setup')|tojson }};
+ } else {
+ throw new Error('Server rejected authenticator response');
+ }
+ }, function(reason) {
+ $('#register-alert').text('Registration failed!');
+ $('#register-alert').removeClass('d-none');
+ $('#register-spinner').addClass('d-none');
+ $('#register-btn-text').text('Retry registration');
+ $('#register-btn').prop('disabled', false);
+ });
+ return false;
+});
+</script>
+
+{% endblock %}
diff --git a/uffd/mfa/views.py b/uffd/mfa/views.py
index be8febd3..3baebf11 100644
--- a/uffd/mfa/views.py
+++ b/uffd/mfa/views.py
@@ -1,18 +1,25 @@
from flask import Blueprint, render_template, session, request, redirect, url_for, flash
+import urllib.parse
+
+from fido2.webauthn import PublicKeyCredentialRpEntity, UserVerificationRequirement
+from fido2.client import ClientData
+from fido2.server import Fido2Server
+from fido2.ctap2 import AttestationObject, AuthenticatorData
+from fido2 import cbor
from uffd.database import db
-from uffd.mfa.models import TOTPMethod
+from uffd.mfa.models import TOTPMethod, WebauthnMethod
from uffd.session.views import get_current_user, login_required
bp = Blueprint('mfa', __name__, template_folder='templates', url_prefix='/mfa/')
-
@bp.route('/', methods=['GET'])
@login_required()
def setup():
user = get_current_user()
- methods = TOTPMethod.query.filter_by(dn=user.dn).all()
- return render_template('setup.html', methods=methods)
+ totp_methods = TOTPMethod.query.filter_by(dn=user.dn).all()
+ webauthn_methods = WebauthnMethod.query.filter_by(dn=user.dn).all()
+ return render_template('setup.html', totp_methods=totp_methods, webauthn_methods=webauthn_methods)
@bp.route('/setup/totp', methods=['GET'])
@login_required()
@@ -44,12 +51,105 @@ def delete_totp(id):
db.session.commit()
return redirect(url_for('mfa.setup'))
+@bp.route('/setup/webauthn', methods=['GET'])
+@login_required()
+def setup_webauthn():
+ user = get_current_user()
+ return render_template('setup_webauthn.html')
+
+def get_webauthn_server():
+ return Fido2Server(PublicKeyCredentialRpEntity(urllib.parse.urlsplit(request.url).hostname, "uffd"))
+
+@bp.route('/setup/webauthn/begin', methods=['POST'])
+@login_required()
+def setup_webauthn_begin():
+ user = get_current_user()
+ server = get_webauthn_server()
+ registration_data, state = server.register_begin(
+ {
+ "id": user.loginname.encode(),
+ "name": user.loginname,
+ "displayName": user.displayname,
+ "icon": "https://example.com/image.png",
+ },
+ [],
+ user_verification=UserVerificationRequirement.DISCOURAGED,
+ authenticator_attachment="cross-platform",
+ )
+ session["state"] = state
+ return cbor.encode(registration_data)
+
+@bp.route('/setup/webauthn/complete', methods=['POST'])
+@login_required()
+def setup_webauthn_complete():
+ user = get_current_user()
+ server = get_webauthn_server()
+ data = cbor.decode(request.get_data())
+ client_data = ClientData(data["clientDataJSON"])
+ att_obj = AttestationObject(data["attestationObject"])
+ auth_data = server.register_complete(session["state"], client_data, att_obj)
+ method = WebauthnMethod(user, auth_data, name=data['name'])
+ db.session.add(method)
+ db.session.commit()
+ print("REGISTERED CREDENTIAL:", auth_data.credential_data)
+ return cbor.encode({"status": "OK"})
+
+@bp.route('/setup/webauthn/<int:id>/delete')
+@login_required()
+def delete_webauthn(id):
+ user = get_current_user()
+ method = WebauthnMethod.query.filter_by(dn=user.dn, id=id).first_or_404()
+ db.session.delete(method)
+ db.session.commit()
+ return redirect(url_for('mfa.setup'))
+
+@bp.route("/auth/webauthn/begin", methods=["POST"])
+def auth_webauthn_begin():
+ user = get_current_user()
+ server = get_webauthn_server()
+ methods = WebauthnMethod.query.filter_by(dn=user.dn).all()
+ creds = [method.cred_data.credential_data for method in methods]
+ print(creds)
+ if not creds:
+ abort(404)
+ auth_data, state = server.authenticate_begin(creds, user_verification=UserVerificationRequirement.DISCOURAGED)
+ session["state"] = state
+ return cbor.encode(auth_data)
+
+@bp.route("/auth/webauthn/complete", methods=["POST"])
+def auth_webauthn_complete():
+ user = get_current_user()
+ server = get_webauthn_server()
+ methods = WebauthnMethod.query.filter_by(dn=user.dn).all()
+ creds = [method.cred_data.credential_data for method in methods]
+ if not creds:
+ abort(404)
+ data = cbor.decode(request.get_data())
+ credential_id = data["credentialId"]
+ client_data = ClientData(data["clientDataJSON"])
+ auth_data = AuthenticatorData(data["authenticatorData"])
+ signature = data["signature"]
+ print("clientData", client_data)
+ print("AuthenticatorData", auth_data)
+ server.authenticate_complete(
+ session.pop("state"),
+ creds,
+ credential_id,
+ client_data,
+ auth_data,
+ signature,
+ )
+ print("ASSERTION OK")
+ return cbor.encode({"status": "OK"})
+
@bp.route('/auth', methods=['GET'])
@login_required()
def auth():
user = get_current_user()
- methods = TOTPMethod.query.filter_by(dn=user.dn).all()
- return render_template('auth.html', ref=request.values.get('ref'), methods=methods)
+ totp_methods = TOTPMethod.query.filter_by(dn=user.dn).all()
+ webauthn_methods = WebauthnMethod.query.filter_by(dn=user.dn).all()
+ return render_template('auth.html', ref=request.values.get('ref'), totp_methods=totp_methods,
+ webauthn_methods=webauthn_methods)
@bp.route('/auth', methods=['POST'])
@login_required()
diff --git a/uffd/static/cbor.js b/uffd/static/cbor.js
new file mode 100644
index 00000000..3e1f300d
--- /dev/null
+++ b/uffd/static/cbor.js
@@ -0,0 +1,406 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014-2016 Patrick Gansterer <paroga@paroga.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+(function(global, undefined) { "use strict";
+var POW_2_24 = 5.960464477539063e-8,
+ POW_2_32 = 4294967296,
+ POW_2_53 = 9007199254740992;
+
+function encode(value) {
+ var data = new ArrayBuffer(256);
+ var dataView = new DataView(data);
+ var lastLength;
+ var offset = 0;
+
+ function prepareWrite(length) {
+ var newByteLength = data.byteLength;
+ var requiredLength = offset + length;
+ while (newByteLength < requiredLength)
+ newByteLength <<= 1;
+ if (newByteLength !== data.byteLength) {
+ var oldDataView = dataView;
+ data = new ArrayBuffer(newByteLength);
+ dataView = new DataView(data);
+ var uint32count = (offset + 3) >> 2;
+ for (var i = 0; i < uint32count; ++i)
+ dataView.setUint32(i << 2, oldDataView.getUint32(i << 2));
+ }
+
+ lastLength = length;
+ return dataView;
+ }
+ function commitWrite() {
+ offset += lastLength;
+ }
+ function writeFloat64(value) {
+ commitWrite(prepareWrite(8).setFloat64(offset, value));
+ }
+ function writeUint8(value) {
+ commitWrite(prepareWrite(1).setUint8(offset, value));
+ }
+ function writeUint8Array(value) {
+ var dataView = prepareWrite(value.length);
+ for (var i = 0; i < value.length; ++i)
+ dataView.setUint8(offset + i, value[i]);
+ commitWrite();
+ }
+ function writeUint16(value) {
+ commitWrite(prepareWrite(2).setUint16(offset, value));
+ }
+ function writeUint32(value) {
+ commitWrite(prepareWrite(4).setUint32(offset, value));
+ }
+ function writeUint64(value) {
+ var low = value % POW_2_32;
+ var high = (value - low) / POW_2_32;
+ var dataView = prepareWrite(8);
+ dataView.setUint32(offset, high);
+ dataView.setUint32(offset + 4, low);
+ commitWrite();
+ }
+ function writeTypeAndLength(type, length) {
+ if (length < 24) {
+ writeUint8(type << 5 | length);
+ } else if (length < 0x100) {
+ writeUint8(type << 5 | 24);
+ writeUint8(length);
+ } else if (length < 0x10000) {
+ writeUint8(type << 5 | 25);
+ writeUint16(length);
+ } else if (length < 0x100000000) {
+ writeUint8(type << 5 | 26);
+ writeUint32(length);
+ } else {
+ writeUint8(type << 5 | 27);
+ writeUint64(length);
+ }
+ }
+
+ function encodeItem(value) {
+ var i;
+
+ if (value === false)
+ return writeUint8(0xf4);
+ if (value === true)
+ return writeUint8(0xf5);
+ if (value === null)
+ return writeUint8(0xf6);
+ if (value === undefined)
+ return writeUint8(0xf7);
+
+ switch (typeof value) {
+ case "number":
+ if (Math.floor(value) === value) {
+ if (0 <= value && value <= POW_2_53)
+ return writeTypeAndLength(0, value);
+ if (-POW_2_53 <= value && value < 0)
+ return writeTypeAndLength(1, -(value + 1));
+ }
+ writeUint8(0xfb);
+ return writeFloat64(value);
+
+ case "string":
+ var utf8data = [];
+ for (i = 0; i < value.length; ++i) {
+ var charCode = value.charCodeAt(i);
+ if (charCode < 0x80) {
+ utf8data.push(charCode);
+ } else if (charCode < 0x800) {
+ utf8data.push(0xc0 | charCode >> 6);
+ utf8data.push(0x80 | charCode & 0x3f);
+ } else if (charCode < 0xd800) {
+ utf8data.push(0xe0 | charCode >> 12);
+ utf8data.push(0x80 | (charCode >> 6) & 0x3f);
+ utf8data.push(0x80 | charCode & 0x3f);
+ } else {
+ charCode = (charCode & 0x3ff) << 10;
+ charCode |= value.charCodeAt(++i) & 0x3ff;
+ charCode += 0x10000;
+
+ utf8data.push(0xf0 | charCode >> 18);
+ utf8data.push(0x80 | (charCode >> 12) & 0x3f);
+ utf8data.push(0x80 | (charCode >> 6) & 0x3f);
+ utf8data.push(0x80 | charCode & 0x3f);
+ }
+ }
+
+ writeTypeAndLength(3, utf8data.length);
+ return writeUint8Array(utf8data);
+
+ default:
+ var length;
+ if (Array.isArray(value)) {
+ length = value.length;
+ writeTypeAndLength(4, length);
+ for (i = 0; i < length; ++i)
+ encodeItem(value[i]);
+ } else if (value instanceof Uint8Array) {
+ writeTypeAndLength(2, value.length);
+ writeUint8Array(value);
+ } else {
+ var keys = Object.keys(value);
+ length = keys.length;
+ writeTypeAndLength(5, length);
+ for (i = 0; i < length; ++i) {
+ var key = keys[i];
+ encodeItem(key);
+ encodeItem(value[key]);
+ }
+ }
+ }
+ }
+
+ encodeItem(value);
+
+ if ("slice" in data)
+ return data.slice(0, offset);
+
+ var ret = new ArrayBuffer(offset);
+ var retView = new DataView(ret);
+ for (var i = 0; i < offset; ++i)
+ retView.setUint8(i, dataView.getUint8(i));
+ return ret;
+}
+
+function decode(data, tagger, simpleValue) {
+ var dataView = new DataView(data);
+ var offset = 0;
+
+ if (typeof tagger !== "function")
+ tagger = function(value) { return value; };
+ if (typeof simpleValue !== "function")
+ simpleValue = function() { return undefined; };
+
+ function commitRead(length, value) {
+ offset += length;
+ return value;
+ }
+ function readArrayBuffer(length) {
+ return commitRead(length, new Uint8Array(data, offset, length));
+ }
+ function readFloat16() {
+ var tempArrayBuffer = new ArrayBuffer(4);
+ var tempDataView = new DataView(tempArrayBuffer);
+ var value = readUint16();
+
+ var sign = value & 0x8000;
+ var exponent = value & 0x7c00;
+ var fraction = value & 0x03ff;
+
+ if (exponent === 0x7c00)
+ exponent = 0xff << 10;
+ else if (exponent !== 0)
+ exponent += (127 - 15) << 10;
+ else if (fraction !== 0)
+ return (sign ? -1 : 1) * fraction * POW_2_24;
+
+ tempDataView.setUint32(0, sign << 16 | exponent << 13 | fraction << 13);
+ return tempDataView.getFloat32(0);
+ }
+ function readFloat32() {
+ return commitRead(4, dataView.getFloat32(offset));
+ }
+ function readFloat64() {
+ return commitRead(8, dataView.getFloat64(offset));
+ }
+ function readUint8() {
+ return commitRead(1, dataView.getUint8(offset));
+ }
+ function readUint16() {
+ return commitRead(2, dataView.getUint16(offset));
+ }
+ function readUint32() {
+ return commitRead(4, dataView.getUint32(offset));
+ }
+ function readUint64() {
+ return readUint32() * POW_2_32 + readUint32();
+ }
+ function readBreak() {
+ if (dataView.getUint8(offset) !== 0xff)
+ return false;
+ offset += 1;
+ return true;
+ }
+ function readLength(additionalInformation) {
+ if (additionalInformation < 24)
+ return additionalInformation;
+ if (additionalInformation === 24)
+ return readUint8();
+ if (additionalInformation === 25)
+ return readUint16();
+ if (additionalInformation === 26)
+ return readUint32();
+ if (additionalInformation === 27)
+ return readUint64();
+ if (additionalInformation === 31)
+ return -1;
+ throw "Invalid length encoding";
+ }
+ function readIndefiniteStringLength(majorType) {
+ var initialByte = readUint8();
+ if (initialByte === 0xff)
+ return -1;
+ var length = readLength(initialByte & 0x1f);
+ if (length < 0 || (initialByte >> 5) !== majorType)
+ throw "Invalid indefinite length element";
+ return length;
+ }
+
+ function appendUtf16Data(utf16data, length) {
+ for (var i = 0; i < length; ++i) {
+ var value = readUint8();
+ if (value & 0x80) {
+ if (value < 0xe0) {
+ value = (value & 0x1f) << 6
+ | (readUint8() & 0x3f);
+ length -= 1;
+ } else if (value < 0xf0) {
+ value = (value & 0x0f) << 12
+ | (readUint8() & 0x3f) << 6
+ | (readUint8() & 0x3f);
+ length -= 2;
+ } else {
+ value = (value & 0x0f) << 18
+ | (readUint8() & 0x3f) << 12
+ | (readUint8() & 0x3f) << 6
+ | (readUint8() & 0x3f);
+ length -= 3;
+ }
+ }
+
+ if (value < 0x10000) {
+ utf16data.push(value);
+ } else {
+ value -= 0x10000;
+ utf16data.push(0xd800 | (value >> 10));
+ utf16data.push(0xdc00 | (value & 0x3ff));
+ }
+ }
+ }
+
+ function decodeItem() {
+ var initialByte = readUint8();
+ var majorType = initialByte >> 5;
+ var additionalInformation = initialByte & 0x1f;
+ var i;
+ var length;
+
+ if (majorType === 7) {
+ switch (additionalInformation) {
+ case 25:
+ return readFloat16();
+ case 26:
+ return readFloat32();
+ case 27:
+ return readFloat64();
+ }
+ }
+
+ length = readLength(additionalInformation);
+ if (length < 0 && (majorType < 2 || 6 < majorType))
+ throw "Invalid length";
+
+ switch (majorType) {
+ case 0:
+ return length;
+ case 1:
+ return -1 - length;
+ case 2:
+ if (length < 0) {
+ var elements = [];
+ var fullArrayLength = 0;
+ while ((length = readIndefiniteStringLength(majorType)) >= 0) {
+ fullArrayLength += length;
+ elements.push(readArrayBuffer(length));
+ }
+ var fullArray = new Uint8Array(fullArrayLength);
+ var fullArrayOffset = 0;
+ for (i = 0; i < elements.length; ++i) {
+ fullArray.set(elements[i], fullArrayOffset);
+ fullArrayOffset += elements[i].length;
+ }
+ return fullArray;
+ }
+ return readArrayBuffer(length);
+ case 3:
+ var utf16data = [];
+ if (length < 0) {
+ while ((length = readIndefiniteStringLength(majorType)) >= 0)
+ appendUtf16Data(utf16data, length);
+ } else
+ appendUtf16Data(utf16data, length);
+ return String.fromCharCode.apply(null, utf16data);
+ case 4:
+ var retArray;
+ if (length < 0) {
+ retArray = [];
+ while (!readBreak())
+ retArray.push(decodeItem());
+ } else {
+ retArray = new Array(length);
+ for (i = 0; i < length; ++i)
+ retArray[i] = decodeItem();
+ }
+ return retArray;
+ case 5:
+ var retObject = {};
+ for (i = 0; i < length || length < 0 && !readBreak(); ++i) {
+ var key = decodeItem();
+ retObject[key] = decodeItem();
+ }
+ return retObject;
+ case 6:
+ return tagger(decodeItem(), length);
+ case 7:
+ switch (length) {
+ case 20:
+ return false;
+ case 21:
+ return true;
+ case 22:
+ return null;
+ case 23:
+ return undefined;
+ default:
+ return simpleValue(length);
+ }
+ }
+ }
+
+ var ret = decodeItem();
+ if (offset !== data.byteLength)
+ throw "Remaining bytes";
+ return ret;
+}
+
+var obj = { encode: encode, decode: decode };
+
+if (typeof define === "function" && define.amd)
+ define("cbor/cbor", obj);
+else if (typeof module !== "undefined" && module.exports)
+ module.exports = obj;
+else if (!global.CBOR)
+ global.CBOR = obj;
+
+})(this);
--
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