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ovpn2onc.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>OpenVPN to ONC</title>
<meta
name="description"
content="Convert OpenVPN config files to ONC files"
/>
<style>
body {
background-color: #000;
color: #0f0;
font-family: "Courier New", Courier, monospace;
}
#output {
background-color: #ddd;
}
#log {
width: 40em;
min-height: 7em;
border: 1px solid black;
overflow-x: auto;
background-color: #eee;
}
#log > p {
margin: 0px;
}
.btn {
color: #0f0;
background: #000;
font-family: 'Courier New', Courier, monospace;
outline: none;
}
.collapse-toggle {
border: none;
outline: none;
cursor: pointer;
width: 100%;
background-color: #222;
color: #0f0;
font-family: 'Courier New', Courier, monospace;
}
.advanced-collapse {
display: none;
background-color: #444;
flex-direction: column;
}
#loudErrLog {
color: #f00;
}
#log {
color: #000
}
</style>
<script>
/**
* Print loud errors.
*/
let err = (error) => {
document.getElementById("loudErrLog").innerText += error + "\n";
return error;
}
/**
* Register the function `handler` to be called when the `Convert` button is
* pressed.
*/
function setHandler() {
let convertButton = document.getElementById("convertbutton");
convertButton.addEventListener("click", handler, false);
}
/**
* Read parameters and pass them to the `main` function. This function is
* called when the `Convert` button is clicked.
*/
function handler() {
document.getElementById("inputopenvpn").files[0] ?
selectedFile = document.getElementById("inputopenvpn").files[0] : err("Please upload a file.");
let certificates = document.getElementById("inputcertificates").files;
let connName = document.getElementById("connname").value ?
document.getElementById("connname").value : selectedFile.name;
let output = document.getElementById("output");
main(connName, selectedFile, certificates, output);
}
let savePrompt = (name, content) => {
let tempA = document.createElement("a");
let blob = new Blob([content], { type: "text/plain" });
tempA.setAttribute("href", URL.createObjectURL(blob));
tempA.setAttribute("download", `${name}.onc`);
tempA.click();
URL.revokeObjectURL(tempA.href);
};
/**
* Return a function that logs text to the log output.
*/
function getLogger() {
let logOutput = document.getElementById("log");
let logger = function (text) {
logOutput.innerHTML += `<p>${text}</p>`;
};
return logger;
}
/**
* Read, convert and print result. This function calls other functions
* to first read everything, then convert it and finally print the result.
*
* The function is `async` because it uses `await` when reading files.
*
* @param {String} connName Name of the connection
* @param {File} ovpnFile File object for the ovpn file
* @param {Array} certificateFiles List of file objects for the certificates
* @param {Object} output HTML element where the output should go
*/
async function main(connName, ovpnFile, certificateFiles, output) {
log = getLogger();
if (connName === "") {
log("connName is empty");
err("Please specify a name for the connection.");
return;
}
log(`Size of OVPN file: ${ovpnFile.size} bytes`);
let ovpnContent = await readFile(ovpnFile);
let ovpn;
let keys;
try {
[ovpn, keys] = parseOvpn(ovpnContent);
} catch (err) {
log(err);
return;
}
log("Parsed config:");
log(JSON.stringify(ovpn));
for (const certificateFile of certificateFiles) {
keys[certificateFile.name] = await readFile(certificateFile);
}
let onc;
try {
onc = constructOnc(connName, ovpn, keys);
} catch (err) {
log(err);
return;
}
let out = JSON.stringify(onc, null, 2);
output.value = out;
savePrompt(connName, out);
log("All done!");
}
/**
* Return a promise to read a file as text.
*
* @param {File} file A file object
*
* @return {Promise} A promise with the contents of the file
*/
function readFile(file) {
return new Promise((resolve) => {
let reader = new FileReader();
reader.onload = (e) => {
// callback and remove windows-style newlines
resolve(e.target.result.replace(/\r/g, ""));
};
// start reading
reader.readAsText(file);
});
}
/**
* Parse an OVPN file. Extract all the key-value pairs and keys
* that are written inside XML tags.
*
* The key-value pairs are written into an object. The keys are also
* written into an object with the the XML tag name as the key.
*
* @param {String} str The contents of the ovpn file as a string.
*
* @return {Array} An array that contains the key-value pairs and
* the keys.
*/
function parseOvpn(str) {
log = getLogger();
let ovpn = {};
let keys = {};
// define regexes for properties, opening xml tag and closing xml tag
const reProperty = /^([^ ]+)( (.*))?$/i;
const reXmlOpen = /^<([^\/].*)>$/i;
const reXmlClose = /^<\/(.*)>$/i;
// temporary variables for handling xml tags
let xmlTag = "";
let inXml = false;
let xmlContent = "";
let lines = str.split(/[\r\n]+/g);
for (let line of lines) {
// skip line if it is empty or begins with '#' or ';'
if (!line || line.match(/^\s*[;#]/)) {
log(`Skipped line: "${line}"`);
continue;
}
if (inXml) {
// an XML tag was opened and hasn't been closed yet
const xmlMatch = line.match(reXmlClose);
if (!xmlMatch) {
// no closing tag -> add content to `xmlContent`
xmlContent += line + "\n";
continue;
}
const tag = xmlMatch[1];
if (tag !== xmlTag) {
err("Cannot parse ovpn file: bad xml tag");
throw "bad xml tag";
}
// closing tag was found
// make sure the tag name and the contents are safe
const name = makeSafe(xmlTag);
const value = xmlContent;
// store everything and reset the xml variables
keys[name] = value;
ovpn[name] = name;
xmlContent = "";
inXml = false;
continue;
}
const xmlMatch = line.match(reXmlOpen);
if (xmlMatch) {
// an xml tag was opened
inXml = true;
xmlTag = xmlMatch[1];
log(`XML tag was opened: "${xmlTag}"`);
continue;
}
// check if the line contains a property
const match = line.match(reProperty);
if (!match) continue;
// make sure everything is safe and then store it
const key = makeSafe(match[1]);
const value = match[2] ? match[3] || "" : true;
ovpn[key] = value;
log(`Found: ${key} = ${value}`);
}
log("Finished parsing");
return [ovpn, keys];
}
/**
* Check if string is quoted
*/
function isQuoted(val) {
return (
(val.charAt(0) === '"' && val.slice(-1) === '"') ||
(val.charAt(0) === "'" && val.slice(-1) === "'")
);
}
/**
* This function is supposed to prevent any exploits via the object keys
*
* It's probably complete overkill.
*/
function makeSafe(val, doUnesc) {
val = (val || "").trim();
if (isQuoted(val)) {
// remove the single quotes before calling JSON.parse
if (val.charAt(0) === "'") {
val = val.substr(1, val.length - 2);
}
try {
val = JSON.parse(val);
} catch (_) { }
} else {
// walk the val to find the first not-escaped ; character
var esc = false;
var unesc = "";
for (var i = 0, l = val.length; i < l; i++) {
var c = val.charAt(i);
if (esc) {
if ("\\;#".indexOf(c) !== -1) {
unesc += c;
} else {
unesc += "\\" + c;
}
esc = false;
} else if (";#".indexOf(c) !== -1) {
break;
} else if (c === "\\") {
esc = true;
} else {
unesc += c;
}
}
if (esc) {
unesc += "\\";
}
return unesc;
}
return val;
}
/**
* Convert the keys from the parsed OVPN file into ONC keys
*
* @param {Object} keys Strings with keys, indexed by key name
* @param {Object} keynames Object with the key names
* @return {Object} ONC parameters and a list of converted certificates
*/
function convertKeys(keys, keyNames) {
let params = {};
// Add certificates
let certs = [];
// Server certificate
// TODO: confirm that the type should be 'Authority'
let [cas, caGuids] = constructCerts(
keys,
keyNames.certificateAuthorities,
"Authority"
);
params["ServerCARefs"] = caGuids;
certs = certs.concat(cas);
// Client certificate
if (keyNames.clientCertificates) {
// TODO: handle other types of client certificates
let [clientCerts, clientCertGuids] = constructCerts(
keys,
keyNames.clientCertificates,
"Authority"
);
params["ClientCertType"] = "Pattern";
params["ClientCertPattern"] = {
IssuerCARef: clientCertGuids,
};
certs = certs.concat(clientCerts);
} else {
params["ClientCertType"] = "None";
}
// TLS auth
if (keyNames.tlsAuth) {
let authKey = keyNames.tlsAuth.split(" ");
let keyString = keys[authKey[0]];
if (!keyString) {
err(
`Please provide the file '${authKey[0]}' in 'Certificates and keys'`
);
throw `Couldn't find the key for ${authKey[0]}`;
}
params["TLSAuthContents"] = convertKey(keyString);
if (authKey[1]) params["KeyDirection"] = authKey[1];
}
return [params, certs];
}
/**
* Convert the parsed ovpn file into the ONC structure
*
* @param {Object} ovpn The parsed OVPN file
* @return {Array} An array with the host and an object with the parameters
*/
function convertToOnc(ovpn) {
if (!ovpn.client) {
console.warn("Is this a server file?");
}
let params = {};
// Add parameters
let remote = ovpn.remote.split(" ");
const host = remote[0];
if (remote[1]) params["Port"] = Number(remote[1]);
if (ovpn["auth-user-pass"])
params["UserAuthenticationType"] = "Password";
if (ovpn["comp-lzo"] && ovpn["comp-lzo"] !== "no") {
params["CompLZO"] = "true";
} else {
params["CompLZO"] = "false";
}
if (ovpn["persist-key"]) params["SaveCredentials"] = true;
if (ovpn["verify-x509-name"]) {
const x509String = ovpn["verify-x509-name"];
let x509 = {};
if (x509String.includes("'")) {
// the name is quoted with '
const parts = x509String.split("'");
x509["Name"] = parts[1];
if (parts[2]) {
x509["Type"] = parts[2].trim();
}
} else {
const parts = x509String.split(" ");
x509["Name"] = parts[0];
if (parts[1]) {
x509["Type"] = parts[1];
}
}
params["VerifyX509"] = x509;
}
// set parameters if they exist in the ovpn config
let conditionalSet = (ovpnName, oncName, type = "str") => {
if (ovpn[ovpnName]) {
const raw = ovpn[ovpnName];
let value;
switch (type) {
case "int":
value = Number(raw);
break;
default:
value = raw;
}
params[oncName] = value;
} else {
log(`Value for '${ovpnName}' not specified.`);
}
};
conditionalSet("port", "Port", "int");
conditionalSet("proto", "Proto");
conditionalSet("key-direction", "KeyDirection");
conditionalSet("remote-cert-tls", "RemoteCertTLS");
conditionalSet("cipher", "Cipher");
conditionalSet("auth", "Auth");
conditionalSet("auth-retry", "AuthRetry");
conditionalSet("reneg-sec", "RenegSec", "int");
const keyNames = {
certificateAuthorities: ovpn["ca"],
clientCertificates: ovpn["cert"],
tlsAuth: ovpn["tls-auth"],
};
return [host, params, keyNames];
}
/**
* Construct the ONC structure from the name, the parsed ovpn file and the keys
*
* @param {string} name Name of the connection
* @param {Object} ovpn The parsed OVPN file
* @param {Object} keys Strings with keys, indexed by key name
* @return {Object} The converted ONC structure
*/
function constructOnc(name, ovpn, keys) {
let [host, params, keyNames] = convertToOnc(ovpn);
let [certParams, certificates] = convertKeys(keys, keyNames);
// merge parameters
params = Object.assign({}, params, certParams);
// Put together network configuration
let networkConfiguration = {
GUID: `{${uuidv4()}}`,
Name: name,
Type: "VPN",
VPN: {
Type: "OpenVPN",
Host: host,
OpenVPN: params,
},
};
// Put everything together
return {
Type: "UnencryptedConfiguration",
Certificates: certificates,
NetworkConfigurations: [networkConfiguration],
};
}
/**
* Create UUID (from Stackoverflow).
*/
function uuidv4() {
return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, (c) =>
(
c ^
(crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
).toString(16)
);
}
/**
* Replace newlines with explicit `\n` and filter out comments
*/
function convertKey(key) {
let lines = key.split(/\n/g);
let out = "";
for (let line of lines) {
// filter out empty lines and lines with comments
if (!line || line.match(/^\s*[;#]/)) continue;
out += line + "\n";
}
return out;
}
/**
* Find all certificates in a string and extract them
*/
function extractCas(str) {
log = getLogger();
let splits = str
.replace(/\n/g, "")
.split("-----BEGIN CERTIFICATE-----");
let cas = [];
for (const s of splits) {
if (s.includes("-----END CERTIFICATE-----")) {
let extractedCa = s.split("-----END CERTIFICATE-----")[0];
log("Extracted CA:");
log(extractedCa);
cas.push(extractedCa);
}
}
return cas;
}
/**
* Construct certificates in the ONC format
*
* @param {Object} keys Strings with keys, indexed by key name
* @param {string} certName The index for the keys object
* @param {string} certType Type of the certificate: 'Authority', 'Client' or
* 'Server'
* @return {Array} An array of certificates and an array of corresponding IDs
*/
function constructCerts(keys, certName, certType) {
let certs = [];
let certGuids = [];
if (certName) {
let cert = keys[certName];
if (!cert) {
err(
`Please provide the file '${certName}' in 'Certificates and keys'`
);
throw `Couldn't find a certificate for ${certName}`;
}
let rawCerts = extractCas(cert);
const format = certType === "Authority" ? "X509" : "PKCS12";
for (const cert of rawCerts) {
const guid = `{${uuidv4()}}`;
certGuids.push(guid);
let oncCert = {
GUID: guid,
Type: certType,
};
oncCert[format] = cert;
certs.push(oncCert);
}
}
return [certs, certGuids];
}
</script>
</head>
<body onload="setHandler()">
<div>
<h1>ovpn2onc</h1>
<p>
<label for="inputopenvpn">OpenVPN config file (*.ovpn):</label>
<input class="btn" type="file" id="inputopenvpn" />
</p>
<button class="btn" id="convertbutton" type="button">Convert</button>
<p id="loudErrLog"> </p>
<button id="advanced" class="collapse-toggle">Advanced [+]</button>
<div class="advanced-collapse">
<div>
<label for="connname">Name your VPN: </label>
<input type="text" id="connname" />
</div>
<br />
<div>
<label for="inputcertificates"
>Certificates and keys (can be multiple files):</label
>
<input class="btn" type="file" id="inputcertificates" multiple />
</div>
<h2>raw output</h2>
<div>
<textarea
readonly
id="output"
wrap="off"
rows="40"
cols="100"
></textarea>
</div>
<h2>logging info</h2>
<div>
<div id="log"></div>
</div>
</div>
</div>
<script>
/**
* Handle the collapse Advanced menu.
*/
document.getElementById("advanced").addEventListener("click", () => {
if (
document.getElementsByClassName("advanced-collapse")[0].style
.display === "flex"
) {
document.getElementsByClassName(
"advanced-collapse"
)[0].style.display = "none";
} else {
document.getElementsByClassName(
"advanced-collapse"
)[0].style.display = "flex";
}
});
</script>
</body>
</html>