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jwcert.js
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jwcert.js
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is trusted.js; substantial portions derived
* from XAuth code originally produced by Meebo, Inc., and provided
* under the Apache License, Version 2.0; see http://github.com/xauth/xauth
*
* Contributor(s):
* Ben Adida <benadida@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
//
// certs based on JWS
//
// a sample JWCert:
//
// {
// iss: "example.com",
// exp: "1313971280961",
// iat: "1313971259361",
// public-key: {
// alg: "RS256",
// value: "-----BEGIN PUBLIC KEY-----MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIn8oZeKoif0us1CTj12zGveebf1FfEmlBW2Gh38kejVP2fSgjSWtMuHzzCcQuWwxCe3M5L5My9BgOtcsyQCzpECAwEAAQ==-----END PUBLIC KEY-----"
// },
// principal: {
// email: "john@example.com"
// }
// }
//
//
// for intermediate certificates, fake subdomains of the issuer can be used,
// with a different type of principal
//
// {
// iss: "example.com",
// exp: "1313971280961",
// iat: "1313971259361",
// public-key: {
// alg: "RS",
// value: "-----BEGIN PUBLIC KEY-----MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIn8oZeKoif0us1CTj12zGveebf1FfEmlBW2Gh38kejVP2fSgjSWtMuHzzCcQuWwxCe3M5L5My9BgOtcsyQCzpECAwEAAQ==-----END PUBLIC KEY-----"
// },
// principal: {
// host: "intermediate1.example.com"
// }
// }
var libs = require("./libs/all"),
utils = require("./utils"),
jwk = require("./jwk"),
jws = require("./jws"),
und = require("./underscore.js");
function JWCert(issuer, expires, issued_at, pk, principal) {
this.init(issuer, expires, issued_at, pk, principal);
};
JWCert.prototype = new jws.JWS();
// add some methods
JWCert.prototype.init = function(issuer, expires, issued_at, pk, principal) {
this.issuer = issuer;
this.expires = expires;
this.issued_at = issued_at;
this.pk = pk;
this.principal = principal;
};
JWCert.prototype.serializePayload = function() {
return JSON.stringify({
iss: this.issuer,
exp: this.expires ? this.expires.valueOf() : null,
iat: this.issued_at ? this.issued_at.valueOf() : null,
"public-key": this.pk.toSimpleObject(),
principal: this.principal
});
};
// this is called automatically by JWS
// after verification
JWCert.prototype.deserializePayload = function(payload) {
var obj = JSON.parse(payload);
var exp = new Date();
exp.setTime(obj.exp);
var iat = null;
if (obj.iat) {
iat = new Date();
iat.setTime(obj.iat);
}
var pk = jwk.PublicKey.fromSimpleObject(obj['public-key']);
this.init(obj.iss, exp, iat, pk, obj.principal);
};
// a utility function to verify a chain of certificates
// where each certificate is serialized
// rootCB is a callback function that fetches the necessary
// root PK given the issuer domain. It is given a continuation parameter
//
// if the chain verifies, the last public key is returned
// if the chain does not verify, null is returned (FIXME: throw an exception?)
JWCert.verifyChain = function(listOfSerializedCert, validUntil, rootCB, successCB, errorCB) {
// parse all the certs
var certs = und.map(listOfSerializedCert, function(serializedCert) {
var c = new JWCert();
c.parse(serializedCert);
return c;
});
// figure out issuer of first cert
var root_issuer = certs[0].issuer;
// fetch the root pk and continue
rootCB(root_issuer, function(root_pk) {
// if no root pk, stop now
if (!root_pk)
return errorCB("no root PK found");
var current_pk = root_pk;
var current_principal = null;
var goodsig = true;
var fresh = true;
// loop through certs
und.each(certs, function(cert) {
// is the cert expired?
if (cert.expires < validUntil) {
fresh = false;
} else {
// verify the cert only if it's valid
if (!cert.verify(current_pk))
goodsig = false;
}
// next pk to check
current_pk = cert.pk;
current_principal = cert.principal;
});
if (!goodsig)
return errorCB("bad signature in chain");
if (!fresh)
return errorCB("expired cert in chain");
// return last certified public key
successCB(current_pk, current_principal);
});
};
exports.JWCert = JWCert;