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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
this.EXPORTED_SYMBOLS = [ "BadCertHandler", "checkCert", "readCertPrefs", "validateCert" ];
const Ce = Components.Exception;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;
Components.utils.import("resource://gre/modules/Services.jsm");
/**
* Reads a set of expected certificate attributes from preferences. The returned
* array can be passed to validateCert or checkCert to validate that a
* certificate matches the expected attributes. The preferences should look like
* this:
* prefix.1.attribute1
* prefix.1.attribute2
* prefix.2.attribute1
* etc.
* Each numeric branch contains a set of required attributes for a single
* certificate. Having multiple numeric branches means that multiple
* certificates would be accepted by validateCert.
*
* @param aPrefBranch
* The prefix for all preferences, should end with a ".".
* @return An array of JS objects with names / values corresponding to the
* expected certificate's attribute names / values.
*/
this.readCertPrefs =
function readCertPrefs(aPrefBranch) {
if (Services.prefs.getBranch(aPrefBranch).getChildList("").length == 0)
return null;
let certs = [];
let counter = 1;
while (true) {
let prefBranchCert = Services.prefs.getBranch(aPrefBranch + counter + ".");
let prefCertAttrs = prefBranchCert.getChildList("");
if (prefCertAttrs.length == 0)
break;
let certAttrs = {};
for (let prefCertAttr of prefCertAttrs)
certAttrs[prefCertAttr] = prefBranchCert.getCharPref(prefCertAttr);
certs.push(certAttrs);
counter++;
}
return certs;
}
/**
* Verifies that an nsIX509Cert matches the expected certificate attribute
* values.
*
* @param aCertificate
* The nsIX509Cert to compare to the expected attributes.
* @param aCerts
* An array of JS objects with names / values corresponding to the
* expected certificate's attribute names / values. If this is null or
* an empty array then no checks are performed.
* @throws NS_ERROR_ILLEGAL_VALUE if a certificate attribute name from the
* aCerts param does not exist or the value for a certificate attribute
* from the aCerts param is different than the expected value or
* aCertificate wasn't specified and aCerts is not null or an empty
* array.
*/
this.validateCert =
function validateCert(aCertificate, aCerts) {
// If there are no certificate requirements then just exit
if (!aCerts || aCerts.length == 0)
return;
if (!aCertificate) {
const missingCertErr = "A required certificate was not present.";
Cu.reportError(missingCertErr);
throw new Ce(missingCertErr, Cr.NS_ERROR_ILLEGAL_VALUE);
}
var errors = [];
for (var i = 0; i < aCerts.length; ++i) {
var error = false;
var certAttrs = aCerts[i];
for (var name in certAttrs) {
if (!(name in aCertificate)) {
error = true;
errors.push("Expected attribute '" + name + "' not present in " +
"certificate.");
break;
}
if (aCertificate[name] != certAttrs[name]) {
error = true;
errors.push("Expected certificate attribute '" + name + "' " +
"value incorrect, expected: '" + certAttrs[name] +
"', got: '" + aCertificate[name] + "'.");
break;
}
}
if (!error)
break;
}
if (error) {
errors.forEach(Cu.reportError.bind(Cu));
const certCheckErr = "Certificate checks failed. See previous errors " +
"for details.";
Cu.reportError(certCheckErr);
throw new Ce(certCheckErr, Cr.NS_ERROR_ILLEGAL_VALUE);
}
}
/**
* Checks if the connection must be HTTPS and if so, only allows built-in
* certificates and validates application specified certificate attribute
* values.
* See bug 340198 and bug 544442.
*
* @param aChannel
* The nsIChannel that will have its certificate checked.
* @param aAllowNonBuiltInCerts (optional)
* When true certificates that aren't builtin are allowed. When false
* or not specified the certificate must be a builtin certificate.
* @param aCerts (optional)
* An array of JS objects with names / values corresponding to the
* channel's expected certificate's attribute names / values. If it
* isn't null or not specified the the scheme for the channel's
* originalURI must be https.
* @throws NS_ERROR_UNEXPECTED if a certificate is expected and the URI scheme
* is not https.
* NS_ERROR_ILLEGAL_VALUE if a certificate attribute name from the
* aCerts param does not exist or the value for a certificate attribute
* from the aCerts param is different than the expected value.
* NS_ERROR_ABORT if the certificate issuer is not built-in.
*/
this.checkCert =
function checkCert(aChannel, aAllowNonBuiltInCerts, aCerts) {
if (!aChannel.originalURI.schemeIs("https")) {
// Require https if there are certificate values to verify
if (aCerts) {
throw new Ce("SSL is required and URI scheme is not https.",
Cr.NS_ERROR_UNEXPECTED);
}
return;
}
var cert =
aChannel.securityInfo.QueryInterface(Ci.nsISSLStatusProvider).
SSLStatus.QueryInterface(Ci.nsISSLStatus).serverCert;
validateCert(cert, aCerts);
if (aAllowNonBuiltInCerts === true)
return;
var issuerCert = cert;
while (issuerCert.issuer && !issuerCert.issuer.equals(issuerCert))
issuerCert = issuerCert.issuer;
const certNotBuiltInErr = "Certificate issuer is not built-in.";
if (!issuerCert)
throw new Ce(certNotBuiltInErr, Cr.NS_ERROR_ABORT);
var tokenNames = issuerCert.getAllTokenNames({});
if (!tokenNames || !tokenNames.some(isBuiltinToken))
throw new Ce(certNotBuiltInErr, Cr.NS_ERROR_ABORT);
}
function isBuiltinToken(tokenName) {
return tokenName == "Builtin Object Token";
}
/**
* This class implements nsIBadCertListener. Its job is to prevent "bad cert"
* security dialogs from being shown to the user. It is better to simply fail
* if the certificate is bad. See bug 304286.
*
* @param aAllowNonBuiltInCerts (optional)
* When true certificates that aren't builtin are allowed. When false
* or not specified the certificate must be a builtin certificate.
*/
this.BadCertHandler =
function BadCertHandler(aAllowNonBuiltInCerts) {
this.allowNonBuiltInCerts = aAllowNonBuiltInCerts;
}
BadCertHandler.prototype = {
// nsIChannelEventSink
asyncOnChannelRedirect: function(oldChannel, newChannel, flags, callback) {
if (this.allowNonBuiltInCerts) {
callback.onRedirectVerifyCallback(Components.results.NS_OK);
return;
}
// make sure the certificate of the old channel checks out before we follow
// a redirect from it. See bug 340198.
// Don't call checkCert for internal redirects. See bug 569648.
if (!(flags & Ci.nsIChannelEventSink.REDIRECT_INTERNAL))
checkCert(oldChannel);
callback.onRedirectVerifyCallback(Components.results.NS_OK);
},
// nsIInterfaceRequestor
getInterface: function(iid) {
return this.QueryInterface(iid);
},
// nsISupports
QueryInterface: function(iid) {
if (!iid.equals(Ci.nsIChannelEventSink) &&
!iid.equals(Ci.nsIInterfaceRequestor) &&
!iid.equals(Ci.nsISupports))
throw Cr.NS_ERROR_NO_INTERFACE;
return this;
}
};
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