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STS.js

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// http://lists.w3.org/Archives/Public/www-archive/2009Sep/att-0051/draft-hodges-strict-transport-sec-05.plain.html

const STS = {

enabled: false,

get db() {

delete this.db;

return this.initPersistentDB();

},

initPersistentDB: function() {

return this.db = new STSDB(STSPersistence);

},

processRequest: function(chan) {

if (this.enabled) {

var uri = chan.URI;

if (uri.schemeIs("https")) {

try {

this.db.processHeader(uri.asciiHost, chan.getResponseHeader("Strict-Transport-Security"));

} catch (e) {}

}

}

},

isSTSURI: function(uri) {

return this.enabled && this.db.matches(uri.asciiHost);

},

enterPrivateBrowsing: function() {

try {

this.db.save();

} catch(e) {}

this.db = new STSDB(this.db);

},

exitPrivateBrowsing: function() {

this.initPersistentDB();

},

eraseDB: function() {

this.db.reset();

STSPersistence.save(this.db);

},

patchErrorPage: function(docShell, errorURI) {

// see #errors-in-secure-transport-establishment

if (!this.enabled) return;

if (!(/^about:certerror?/.test(errorURI.spec) &&

this.isSTSURI(docShell.currentURI))

) return;

Thread.delay(function() {

docShell.document.getElementById("expertContent").style.display = "none";

}, 100);

},

dispose: function() {

this.db.save();

}

};

function STSDB(source) {

this._entries = {};

if (source && source._entries) { // clone

var entries = source._entries;

for (var p in entries) {

this._entries[p] = entries[p];

}

} else {

if (source && source.load) {

this._persistence = source;

this.load();

}

}

}

STSDB.prototype = {

_persistence: null,

_dirty: false,

_saveTimer: null,

processHeader: function(host, header) {

if (DNS.isIP(host)) return;

var m = header.match(/^\s*max-age\s*=\s*(\d+)\s*(;\s*includeSubDomains)?/i);

if (!m) return;

var maxAge = parseInt(m[1]);

var includeSubDomains = !!m[2];

var expiration = Math.round(Date.now() / 1000) + maxAge;

if (host in this._entries) {

var e = this._entries[host];

if (e.expiration == expiration && e.includeSubDomains == includeSubDomains)

return;

e.expiration = expiration;

e.includeSubDomains = includeSubDomains;

} else {

this.add(new STSEntry(host, expiration, includeSubDomains));

}

this.saveDeferred();

},

add: function(entry) {

this._entries[entry.host] = entry;

},

matches: function(host, asSuperDomain) {

if (host in this._entries) {

var e = this._entries[host];

if (e.expiration >= Date.now() / 1000) {

if ((!asSuperDomain || e.includeSubDomains))

return true;

} else {

delete this._entries[host];

}

}

var dotPos = host.indexOf(".");

var lastDotPos = host.lastIndexOf(".");

if (dotPos == lastDotPos)

return false;

return this.matches(host.substring(dotPos + 1), true);

},

serialize: function() {

var lines = [], ee = this._entries;

var e;

for (var h in ee) {

e = ee[h];

lines.push([e.host, e.expiration, e.includeSubDomains ? "*" : ""].join(";"));

}

return lines.join("\n");

},

restore: function(s) {

s.split(/\s+/).forEach(function(line) {

if (line) {

var args = line.split(";");

if (args.length > 1)

this.add(new STSEntry(args[0], parseInt(args[1]), !!args[2]));

}

}, this);

},

load: function() {

if (this._persistence) {

this._persistence.load(this);

this.purgeExpired();

}

},

save: function() {

if (this._dirty && this._persistence) {

this.purgeExpired();

this._persistence.save(this);

this._dirty = false;

}

},

saveDeferred: function() {

if (this._dirty || !this._persistence) return;

this._dirty = true;

if (!this._timer) this._timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);

this._timer.initWithCallback(this, 10000, Ci.nsITimer.TYPE_ONE_SHOT);

},

notify: function(timer) {

this.save();

},

purgeExpired: function() {

var now = Math.round(Date.now() / 1000);

for (var h in this._entries) {

if (this._entries[h].expiration < now) delete this._entries[h];

}

},

reset: function() {

this._entries = {};

this._dirty = false;

}

};

function STSEntry(host, expiration, includeSubDomains) {

this.host = host;

this.expiration = expiration;

if (includeSubDomains) this.includeSubDomains = includeSubDomains;

}

STSEntry.prototype = {

includeSubDomains: false

};

const STSPersistence = {

get _file() {

delete this._file;

var f = Cc["@mozilla.org/file/directory_service;1"].getService(

Ci.nsIProperties).get("ProfD", Ci.nsIFile);

f.append("NoScriptSTS.db");

return this._file = f;

},

load: function(db) {

var f = this._file;

try {

if (f.exists()) db.restore(IO.readFile(f));

} catch (e) {

dump("STS: Error loading db from " + f.path + "!" + e + "\n");

return false;

}

return true;

},

save: function(db) {

var f = this._file;

try {

IO.safeWriteFile(f, db.serialize());

} catch(e) {

dump("STS: Error saving db to " + f.path + "!" + e + "\n");

return false;

}

return true;

}

};