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HTTPSRules.js
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893 lines (800 loc) · 30.9 KB
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// Compilation of RegExps is now delayed until they are first used...
function Rule(from, to) {
this.to = to;
this.from_c = from; // This will become a RegExp after compilation
}
function Exclusion(pattern) {
this.pattern_c = pattern; // Will become a RegExp after compilation
}
function CookieRule(host, cookiename) {
this.host = host;
this.name = cookiename;
// These will be made during compilation:
//this.host_c = new RegExp(host);
//this.name_c = new RegExp(cookiename);
}
function RuleSet(id, name, xmlName, match_rule, default_off, platform) {
if(xmlName == "WordPress.xml" || xmlName == "Github.xml") {
this.log(NOTE, "RuleSet( name="+name+", xmlName="+xmlName+", match_rule="+match_rule+", default_off="+default_off+", platform="+platform+" )");
}
this.id=id;
this.on_by_default = true;
this.compiled = false;
this.name = name;
this.xmlName = xmlName;
this.notes = "";
if (match_rule) this.ruleset_match_c = new RegExp(match_rule);
else this.ruleset_match_c = null;
if (default_off) {
// Perhaps problematically, this currently ignores the actual content of
// the default_off XML attribute. Ideally we'd like this attribute to be
// "valueless"
this.notes = default_off;
this.on_by_default = false;
}
if (platform)
if (platform.search(HTTPSRules.localPlatformRegexp) == -1) {
this.on_by_default = false;
this.notes = "Only for " + platform;
}
this.rules = [];
this.exclusions = [];
this.cookierules = [];
this.rule_toggle_prefs = HTTPSEverywhere.instance.rule_toggle_prefs;
try {
// if this pref exists, use it
this.active = this.rule_toggle_prefs.getBoolPref(name);
} catch(e) {
// if not, use the default
this.active = this.on_by_default;
}
}
var dom_parser = Cc["@mozilla.org/xmlextras/domparser;1"].createInstance(Ci.nsIDOMParser);
RuleSet.prototype = {
ensureCompiled: function() {
// Postpone compilation of exclusions, rules and cookies until now, to accelerate
// browser load time.
// NOTE: Since rulesets are now lazy-loaded in FF, this will be called immediately
// after the ruleset is loaded, and doesn't give much startup benefit. We
// may want to switch these back so patterns are compiled immediately on
// ruleset load, for simplicity.
if (this.compiled) return;
var i;
for (i = 0; i < this.exclusions.length; ++i) {
this.exclusions[i].pattern_c = new RegExp(this.exclusions[i].pattern_c);
}
for (i = 0; i < this.rules.length; ++i) {
this.rules[i].from_c = new RegExp(this.rules[i].from_c);
}
for (i = 0; i < this.cookierules.length; i++) {
var cr = this.cookierules[i];
cr.host_c = new RegExp(cr.host);
cr.name_c = new RegExp(cr.name);
}
this.compiled = true;
},
apply: function(urispec) {
// return null if it does not apply
// and the new url if it does apply
var i;
var returl = null;
this.ensureCompiled();
// If a rulset has a match_rule and it fails, go no further
if (this.ruleset_match_c && !this.ruleset_match_c.test(urispec)) {
this.log(VERB, "ruleset_match_c excluded " + urispec);
return null;
}
// Even so, if we're covered by an exclusion, go home
for (i = 0; i < this.exclusions.length; ++i) {
if (this.exclusions[i].pattern_c.test(urispec)) {
this.log(DBUG,"excluded uri " + urispec);
return null;
}
}
// Okay, now find the first rule that triggers
for (i = 0; i < this.rules.length; ++i) {
// This is just for displaying inactive rules
returl = urispec.replace(this.rules[i].from_c, this.rules[i].to);
if (returl != urispec) {
// we rewrote the uri
this.log(DBUG, "Rewrote " + urispec + " -> " + returl + " using " + this.xmlName + ": " + this.rules[i].from_c + " -> " + this.rules[i].to);
return returl;
}
}
return null;
},
log: function(level, msg) {
https_everywhereLog(level, msg);
},
wouldMatch: function(hypothetical_uri, alist) {
// return true if this ruleset would match the uri, assuming it were http
// used for judging moot / inactive rulesets
// alist is optional
// if the ruleset is already somewhere in this applicable list, we don't
// care about hypothetical wouldMatch questions
if (alist && (this.name in alist.all)) return false;
this.log(DBUG,"Would " +this.name + " match " +hypothetical_uri.spec +
"? serial " + (alist && alist.serial));
var uri = hypothetical_uri.clone();
if (uri.scheme == "https") uri.scheme = "http";
var urispec = uri.spec;
this.ensureCompiled();
if (this.ruleset_match_c && !this.ruleset_match_c.test(urispec))
return false;
for (var i = 0; i < this.exclusions.length; ++i)
if (this.exclusions[i].pattern_c.test(urispec)) return false;
for (var i = 0; i < this.rules.length; ++i)
if (this.rules[i].from_c.test(urispec)) return true;
return false;
},
transformURI: function(uri) {
// If no rule applies, return null; if a rule would have applied but was
// inactive, return 0; otherwise, return a fresh uri instance
// for the target
var newurl = this.apply(uri.spec);
if (null == newurl)
return null;
var newuri = Components.classes["@mozilla.org/network/standard-url;1"].
createInstance(CI.nsIStandardURL);
newuri.init(CI.nsIStandardURL.URLTYPE_STANDARD, 80,
newurl, uri.originCharset, null);
newuri = newuri.QueryInterface(CI.nsIURI);
return newuri;
},
enable: function() {
// Enable us.
this.rule_toggle_prefs.setBoolPref(this.name, true);
this.active = true;
},
disable: function() {
// Disable us.
this.rule_toggle_prefs.setBoolPref(this.name, false);
this.active = false;
},
toggle: function() {
this.active = !this.active;
this.rule_toggle_prefs.setBoolPref(this.name, this.active);
},
clear: function() {
try {
this.rule_toggle_prefs.clearUserPref(this.name);
} catch(e) {
// this ruleset has never been toggled
}
this.active = this.on_by_default;
}
};
const RuleWriter = {
getCustomRuleDir: function() {
var loc = "ProfD"; // profile directory
var file =
CC["@mozilla.org/file/directory_service;1"]
.getService(CI.nsIProperties)
.get(loc, CI.nsILocalFile)
.clone();
file.append("HTTPSEverywhereUserRules");
// Check for existence, if not, create.
if (!file.exists()) {
file.create(CI.nsIFile.DIRECTORY_TYPE, 0700);
}
if (!file.isDirectory()) {
// XXX: Arg, death!
}
return file;
},
chromeToPath: function (aPath) {
if (!aPath || !(/^chrome:/.test(aPath)))
return; //not a chrome url
var ios =
CC['@mozilla.org/network/io-service;1']
.getService(CI.nsIIOService);
var uri = ios.newURI(aPath, "UTF-8", null);
var cr =
CC['@mozilla.org/chrome/chrome-registry;1']
.getService(CI.nsIChromeRegistry);
var rv = cr.convertChromeURL(uri).spec;
if (/^file:/.test(rv))
rv = this.urlToPath(rv);
else
rv = this.urlToPath("file://"+rv);
return rv;
},
urlToPath: function (aPath) {
if (!aPath || !/^file:/.test(aPath))
return ;
var ph =
CC["@mozilla.org/network/protocol;1?name=file"]
.createInstance(CI.nsIFileProtocolHandler);
var rv = ph.getFileFromURLSpec(aPath).path;
return rv;
},
read: function(file) {
if (!file.exists())
return null;
var data = "";
var fstream = CC["@mozilla.org/network/file-input-stream;1"]
.createInstance(CI.nsIFileInputStream);
var sstream = CC["@mozilla.org/scriptableinputstream;1"]
.createInstance(CI.nsIScriptableInputStream);
fstream.init(file, -1, 0, 0);
sstream.init(fstream);
var str = sstream.read(4096);
while (str.length > 0) {
data += str;
str = sstream.read(4096);
}
sstream.close();
fstream.close();
return data;
},
write: function(file, data) {
//if (!file.exists())
// return null;
this.log(DBUG, "Opening " + file.path + " for writing");
var fstream = CC["@mozilla.org/network/file-output-stream;1"]
.createInstance(CI.nsIFileOutputStream);
fstream.init(file, -1, -1, 0);
var retval = fstream.write(data, data.length);
this.log(DBUG, "Got retval " + retval);
fstream.close();
return data;
},
rulesetFromFile: function(file, rule_store, ruleset_id) {
if ((rule_store.targets == null) && (rule_store.targets != {}))
this.log(WARN, "TARGETS IS NULL");
var data = this.read(file);
if (!data) return null;
return this.readFromString(data, rule_store, ruleset_id);
},
readFromString: function(data, rule_store, ruleset_id) {
try {
var xmlruleset = dom_parser.parseFromString(data, "text/xml");
} catch(e) { // file has been corrupted; XXX: handle error differently
this.log(WARN,"Error in XML data: " + e + "\n" + data);
return null;
}
this.parseOneRuleset(xmlruleset.documentElement, rule_store, ruleset_id);
},
parseOneRuleset: function(xmlruleset, rule_store, ruleset_id) {
// Extract an xmlruleset into the rulestore
if (!xmlruleset.getAttribute("name")) {
this.log(WARN, "This blob: '" + xmlruleset + "' is not a ruleset\n");
return null;
}
this.log(DBUG, "Parsing " + xmlruleset.getAttribute("name"));
var match_rl = xmlruleset.getAttribute("match_rule");
var dflt_off = xmlruleset.getAttribute("default_off");
var platform = xmlruleset.getAttribute("platform");
var rs = new RuleSet(ruleset_id, xmlruleset.getAttribute("name"), xmlruleset.getAttribute("f"), match_rl, dflt_off, platform);
// see if this ruleset has the same name as an existing ruleset;
// if so, this ruleset is ignored; DON'T add or return it.
if (rs.name in rule_store.rulesetsByName) {
this.log(WARN, "Error: found duplicate rule name " + rs.name);
return null;
}
// Add this ruleset id into HTTPSRules.targets if it's not already there.
// This should only happen for custom user rules. Built-in rules get
// their ids preloaded into the targets map, and have their <target>
// tags stripped when the sqlite database is built.
var targets = xmlruleset.getElementsByTagName("target");
for (var i = 0; i < targets.length; i++) {
var host = targets[i].getAttribute("host");
if (!host) {
this.log(WARN, "<target> missing host in " + xmlruleset.getAttribute("name"));
return null;
}
if (! rule_store.targets[host])
rule_store.targets[host] = [];
this.log(DBUG, "Adding " + host + " to targets, pointing at " + ruleset_id);
rule_store.targets[host].push(ruleset_id);
}
var exclusions = xmlruleset.getElementsByTagName("exclusion");
for (var i = 0; i < exclusions.length; i++) {
var exclusion = new Exclusion(exclusions[i].getAttribute("pattern"));
rs.exclusions.push(exclusion);
}
var rules = xmlruleset.getElementsByTagName("rule");
for (var i = 0; i < rules.length; i++) {
var rule = new Rule(rules[i].getAttribute("from"),
rules[i].getAttribute("to"));
rs.rules.push(rule);
}
var securecookies = xmlruleset.getElementsByTagName("securecookie");
for (var i = 0; i < securecookies.length; i++) {
var c_rule = new CookieRule(securecookies[i].getAttribute("host"),
securecookies[i].getAttribute("name"));
rs.cookierules.push(c_rule);
this.log(DBUG,"Cookie rule "+ c_rule.host+ " " +c_rule.name);
}
rule_store.rulesets.push(rs);
rule_store.rulesetsByID[rs.id] = rs;
rule_store.rulesetsByName[rs.name] = rs;
},
enumerate: function(dir) {
// file is the given directory (nsIFile)
var entries = dir.directoryEntries;
var ret = [];
while(entries.hasMoreElements()) {
var entry = entries.getNext();
entry.QueryInterface(Components.interfaces.nsIFile);
ret.push(entry);
}
return ret;
},
};
const HTTPSRules = {
init: function() {
try {
this.rulesets = [];
this.targets = {}; // dict mapping target host pattern -> list of
// applicable ruleset ids
this.rulesetsByID = {};
this.rulesetsByName = {};
this.targetsLoaded = false;
this.targetsLoadingCallbacks = [];
this.checkMixedContentHandling();
var rulefiles = RuleWriter.enumerate(RuleWriter.getCustomRuleDir());
this.scanRulefiles(rulefiles);
// Initialize database connection.
var dbFile = new FileUtils.File(RuleWriter.chromeToPath("chrome://https-everywhere/content/rulesets.sqlite"));
this.rulesetDBConn = Services.storage.openDatabase(dbFile);
} catch(e) {
this.log(DBUG,"Rules Failed: "+e);
}
return;
},
loadTargets: function(callback) {
if (this.targetsLoaded) {
callback();
return;
}
// loadTargets can be called multiple times before it resolves. We store a
// list of callbacks to call when done, and make sure we only actually do
// the query once.
this.targetsLoadingCallbacks.push(callback);
if (this.targetsLoadingCallbacks.length > 1) {
this.log(DBUG, "Skipping loadTargets, a query is already in progress.");
}
// Load the mapping of hostname target -> ruleset ID from DB.
// This is a little slow (287 ms on a Core2 Duo @ 2.2GHz with SSD),
// but is faster than loading all of the rulesets. If this becomes a
// bottleneck, change it to load in a background webworker, or load
// a smaller bloom filter instead.
var t1 = new Date().getTime();
var query = this.rulesetDBConn.createStatement("select host, ruleset_id from targets");
var that = this;
var count = 0;
this.log(INFO, "Querying targets");
// TODO: Store "this is pending" and resolve all pending once the whole
// thing is loaded.
query.executeAsync({
handleResult: function(aResultSet) {
try {
for (let row = aResultSet.getNextRow();
row;
row = aResultSet.getNextRow()) {
var host = row.getResultByName("host");
var id = row.getResultByName("ruleset_id");
count ++;
if (!that.targets[host]) {
that.targets[host] = [id];
} else {
that.targets[host].push(id);
}
}
} catch (e) {
that.log(WARN, "ERROR " + e);
}
},
handleError: function(aError) {
that.log(WARN, "SQLite error loading targets: " + aError.message);
callback();
},
handleCompletion: function(aReason) {
if (aReason != Components.interfaces.mozIStorageStatementCallback.REASON_FINISHED) {
that.log(WARN, "SQLite query canceled or aborted!");
} else {
var t2 = new Date().getTime();
that.log(NOTE, "Loading " + count + " targets took " + (t2 - t1) / 1000.0 + " seconds");
that.targetsLoadingCallbacks.forEach(function(callback) {
callback();
});
that.targetsLoadingCallbacks = [];
that.targetsLoaded = true;
}
}
});
},
checkMixedContentHandling: function() {
// Firefox 23+ blocks mixed content by default, so rulesets that create
// mixed content situations should be disabled there
var appInfo = CC["@mozilla.org/xre/app-info;1"].getService(CI.nsIXULAppInfo);
var platformVer = appInfo.platformVersion;
var versionChecker = CC["@mozilla.org/xpcom/version-comparator;1"]
.getService(CI.nsIVersionComparator);
var prefs = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefService).getBranch("");
// If mixed content is present and enabled, and the user hasn't opted to enable
// mixed content triggering rules, leave them out. Otherwise add them in.
if(versionChecker.compare(appInfo.version, "23.0a1") >= 0
&& prefs.getBoolPref("security.mixed_content.block_active_content")
&& !prefs.getBoolPref("extensions.https_everywhere.enable_mixed_rulesets")) {
this.log(INFO, "Not activating rules that trigger mixed content errors.");
this.localPlatformRegexp = new RegExp("firefox");
} else {
this.log(INFO, "Activating rules that would normally trigger mixed content");
this.localPlatformRegexp = new RegExp("(firefox|mixedcontent)");
}
},
scanRulefiles: function(rulefiles) {
var i = 0;
var r = null;
for(i = 0; i < rulefiles.length; ++i) {
try {
this.log(DBUG,"Loading ruleset file: "+rulefiles[i].path);
var ruleset_id = "custom_" + i;
RuleWriter.rulesetFromFile(rulefiles[i], this, ruleset_id);
} catch(e) {
this.log(WARN, "Error in ruleset file: " + e);
if (e.lineNumber)
this.log(WARN, "(line number: " + e.lineNumber + ")");
}
}
},
resetRulesetsToDefaults: function() {
// Callable from within the prefs UI and also for cleaning up buggy
// configurations...
for (var i in this.rulesets) {
this.rulesets[i].clear();
}
},
// return true iff callback has been called already, false if callback will be
// called asynchronously
rewrittenURI: function(alist, input_uri, callback) {
// This function oversees the task of working out if a uri should be
// rewritten, what it should be rewritten to, and recordkeeping of which
// applicable rulesets are and aren't active. Previously this returned
// the new uri if there was a rewrite. Now it returns a JS object with a
// newuri attribute and an applied_ruleset attribute (or null if there's
// no rewrite).
var i = 0;
userpass_present = false; // Global so that sanitiseURI can tweak it.
// Why does JS have no tuples, again?
var blob = {}; blob.newuri = null;
if (!alist) this.log(DBUG, "No applicable list rewriting " + input_uri.spec);
this.log(DBUG, "Processing " + input_uri.spec);
// Get the list of rulesets that target this host
try {
var host = input_uri.host
} catch(e) {
// NS_ERROR_FAILURE is normal for accessing uri.host. It just means that
// host is not applicable for the URI scheme, e.g. about: URIs.
// If that happens we quietly return null. If another exception happens
// we noisily return null.
if (e.name != "NS_ERROR_FAILURE") {
this.log(WARN, 'Could not get host from ' + input_uri.spec + ': ' + e);
}
callback(null);
return true;
}
var that = this;
return this.potentiallyApplicableRulesets(host, function(rs) {
var uri = that.sanitiseURI(input_uri);
// ponder each potentially applicable ruleset, working out if it applies
// and recording it as active/inactive/moot/breaking in the applicable list
for (i = 0; i < rs.length; ++i) {
if (!rs[i].active) {
if (alist && rs[i].wouldMatch(uri, alist))
alist.inactive_rule(rs[i]);
continue;
}
blob.newuri = rs[i].transformURI(uri);
if (blob.newuri) {
if (alist) {
if (uri.spec in https_everywhere_blacklist) {
alist.breaking_rule(rs[i]);
} else {
alist.active_rule(rs[i]);
}
}
if (userpass_present) blob.newuri.userPass = input_uri.userPass;
blob.applied_ruleset = rs[i];
callback(blob);
return
}
if (uri.scheme == "https" && alist) {
// we didn't rewrite but the rule applies to this domain and the
// requests are going over https
if (rs[i].wouldMatch(uri, alist)) alist.moot_rule(rs[i]);
continue;
}
}
callback(null);
return;
});
},
sanitiseURI: function(input_uri) {
// Rulesets shouldn't try to parse usernames and passwords. If we find
// those, apply the ruleset without them (and then add them back later).
// When .userPass is absent, sometimes it is false and sometimes trying
// to read it raises an exception (probably depending on the URI type).
var uri = input_uri;
try {
if (input_uri.userPass) {
uri = input_uri.clone();
userpass_present = true; // tweaking a global in our caller :(
uri.userPass = null;
}
} catch(e) {}
// example.com. is equivalent to example.com
// example.com.. is invalid, but firefox would load it anyway
try {
if (uri.host)
try {
var h = uri.host;
if (h.charAt(h.length - 1) == ".") {
while (h.charAt(h.length - 1) == ".")
h = h.slice(0,-1);
uri = uri.clone();
uri.host = h;
}
} catch(e) {
this.log(WARN, "Failed to normalise domain: ");
try {this.log(WARN, input_uri.host);}
catch(e2) {this.log(WARN, "bang" + e + " & " + e2 + " & "+ input_uri);}
}
} catch(e3) {
this.log(INFO, "uri.host is explosive!");
try { this.log(INFO, "(" + uri.spec + ")"); } // happens for about: uris and so forth
catch(e4) { this.log(WARN, "(and unprintable!!!!!!)"); }
}
return uri;
},
setInsert: function(intoList, fromList) {
// Insert any elements from fromList into intoList, if they are not
// already there. fromList may be null.
if (!fromList) return;
for (var i = 0; i < fromList.length; i++)
if (intoList.indexOf(fromList[i]) == -1)
intoList.push(fromList[i]);
},
// Load a ruleset by numeric id, e.g. 234
loadRulesetById: function(ruleset_id, callback) {
var query = this.rulesetDBConn.createStatement(
"select contents from rulesets where id = :id");
query.params.id = ruleset_id;
var that = this;
query.executeAsync({
handleResult: function(aResultSet) {
for (let row = aResultSet.getNextRow();
row;
row = aResultSet.getNextRow()) {
let value = row.getResultByName("contents");
RuleWriter.readFromString(value, that, ruleset_id);
}
},
handleError: function(aError) {
that.log(WARN, "SQLite error: " + aError.message);
callback();
},
handleCompletion: function(aReason) {
if (aReason != Components.interfaces.mozIStorageStatementCallback.REASON_FINISHED) {
that.log(WARN, "SQLite query canceled or aborted!");
}
callback();
}
});
},
// Get all rulesets matching a given target, lazy-loading from DB as necessary.
// Returns true if callback was called immediately: i.e., didn't have to go async.
rulesetsByTargets: function(targets, callback) {
// If the array of target hosts is not already loaded, load it
// (asynchronously). This should only happen once.
if (!this.targetsLoaded) {
this.log(INFO, "Loading targets");
this.loadTargets(this.rulesetsByTargets.bind(this, targets, callback));
return false;
} else {
this.log(INFO, "Targets are loaded " + this.targets["www.eff.org"]);
}
var foundIds = [];
var neededIds = [];
var that = this;
targets.forEach(function(target) {
var rulesetIds = that.targets[target] || [];
rulesetIds.forEach(function(id) {
foundIds.push(id);
if (!that.rulesetsByID[id]) {
neededIds.push(id);
}
});
});
this.log(DBUG, "For targets " + targets.join(' ') +
", found ids " + foundIds + ", need to load: " + neededIds);
var callbackImmediate = true;
function loadOne(done) {
if (neededIds.length !== 0) {
callbackImmediate = false;
that.loadRulesetById(neededIds.pop(), loadOne.bind(null, done));
} else {
done();
}
}
loadOne(function() {
output = foundIds.map(function(id) {
return that.rulesetsByID[id];
})
that.log(DBUG, "Callback from rulesetsByTargets output = " + output);
callback(output);
});
that.log(DBUG, "Returning from rulesetsByTargets callbackImmediate = " + callbackImmediate);
return callbackImmediate;
},
/**
* Return a list of rulesets that declare targets matching a given hostname.
* The returned rulesets include those that are disabled for various reasons.
* This function is only defined for fully-qualified hostnames. Wildcards and
* cookie-style domain attributes with a leading dot are not permitted.
* @param host {string}
* @return true iff we didn't have to go async to load rules
*/
potentiallyApplicableRulesets: function(host, callback) {
if (!callback) {
this.log(WARN, 'Bad problem: potentiallyApplicableRulesets called without callback.');
return false;
}
var i, tmp, t;
var targetsToTry = [host];
// replace each portion of the domain with a * in turn
var segmented = host.split(".");
for (i = 0; i < segmented.length; ++i) {
tmp = segmented[i];
if (tmp.length === 0) {
this.log(WARN,"Malformed host passed to potentiallyApplicableRulesets: " + host);
return false;
}
segmented[i] = "*";
t = segmented.join(".");
segmented[i] = tmp;
targetsToTry.push(t);
}
// now eat away from the left, with *, so that for x.y.z.google.com we
// check *.z.google.com and *.google.com (we did *.y.z.google.com above)
for (i = 2; i <= segmented.length - 2; ++i) {
t = "*." + segmented.slice(i,segmented.length).join(".");
targetsToTry.push(t)
}
var that = this;
return this.rulesetsByTargets(targetsToTry, function(rulesets) {
that.log(DBUG,"Potentially applicable rules for " + host + ":");
for (i = 0; i < rulesets.length; ++i)
that.log(DBUG, " " + rulesets[i].name);
callback(rulesets);
});
},
/**
* If a cookie's domain attribute has a leading dot to indicate it should be
* sent for all subdomains (".example.com"), return the actual host part (the
* part after the dot).
*
* @param cookieDomain {string} A cookie domain to strip a leading dot from.
* @return {string} a fully qualified hostname.
*/
hostFromCookieDomain: function(cookieDomain) {
if (cookieDomain.length > 0 && cookieDomain[0] == ".") {
return cookieDomain.slice(1);
} else {
return cookieDomain;
}
},
/**
* Check to see if the Cookie object c meets any of our cookierule criteria
* for being marked as secure.
*
* @param applicable_list {ApplicableList} an ApplicableList for record keeping
* @param c {nsICookie2} The cookie we might secure.
* @param known_https {boolean} True if the cookie appeared in an HTTPS request and
* so we know it is okay to mark it secure (assuming a cookierule matches it.
* TODO(jsha): Double-check that the code calling this actually does that.
* @return {boolean} True if the cookie in question should have the 'secure'
* flag set to true.
*/
shouldSecureCookie: function(applicable_list, c, known_https) {
this.log(DBUG," rawhost: " + c.rawHost + " name: " + c.name + " host" + c.host);
var i,j;
// potentiallyApplicableRulesets is defined on hostnames not cookie-style
// "domain" attributes, so we strip a leading dot before calling.
var host = this.hostFromCookieDomain(c.host);
// When checking for potentially applicable rulesets, we have to wait for a
// callback, because we may need to load the rulesets from disk. However, in
// practice this callback will always be run immediately, because the
// ruleset for the necessary host will have been loaded already for the HTTP
// request.
var result;
var callbackedImmediate = this.potentiallyApplicableRulesets(host, function(rs) {
result = this.shouldSecureCookieWithRulesets(applicable_list, c, known_https, rs);
}.bind(this));
if (callbackedImmediate) {
return result;
} else {
this.log(WARN, "Shouldn't happen: rulesets were not already loaded for host " + host)
// Default to securing cookies if we aren't sure.
return true
}
},
shouldSecureCookieWithRulesets: function(applicable_list, c, known_https, rs) {
for (i = 0; i < rs.length; ++i) {
var ruleset = rs[i];
if (ruleset.active) {
ruleset.ensureCompiled();
// Never secure a cookie if this page might be HTTP
if (!(known_https || this.safeToSecureCookie(c.rawHost, rs))) {
continue;
}
for (j = 0; j < ruleset.cookierules.length; j++) {
var cr = ruleset.cookierules[j];
if (cr.host_c.test(c.host) && cr.name_c.test(c.name)) {
if (applicable_list) applicable_list.active_rule(ruleset);
this.log(INFO,"Active cookie rule " + ruleset.name);
return true;
}
}
if (ruleset.cookierules.length > 0 && applicable_list) {
applicable_list.moot_rule(ruleset);
}
} else if (ruleset.cookierules.length > 0) {
if (applicable_list) {
applicable_list.inactive_rule(ruleset);
}
this.log(INFO,"Inactive cookie rule " + ruleset.name);
}
}
return false;
},
/**
* Check if the domain might be being served over HTTP. If so, it isn't
* safe to secure a cookie! We can't always know this for sure because
* observing cookie-changed doesn't give us enough context to know the
* full origin URI. In particular, if cookies are set from Javascript (as
* opposed to HTTP/HTTPS responses), we don't know what page context that
* Javascript ran in.
* First, if there are any redirect loops on this domain, don't secure
* cookies. XXX This is not a very satisfactory heuristic. Sometimes we
* would want to secure the cookie anyway, because the URLs that loop are
* not authenticated or not important. Also by the time the loop has been
* observed and the domain blacklisted, a cookie might already have been
* flagged as secure.
*
* @param domain {string} The cookie's 'domain' attribute.
* @param rs {Array.<Ruleset>} A list of potentially applicable rulesets.
* @return {boolean} True if it's safe to secure a cookie on that domain.
*/
safeToSecureCookie: function(domain, rs) {
if (domain in https_blacklist_domains) {
this.log(INFO, "cookies for " + domain + "blacklisted");
return false;
}
// If we passed that test, make up a random URL on the domain, and see if
// we would HTTPSify that.
try {
var nonce_path = "/" + Math.random().toString();
nonce_path = nonce_path + nonce_path;
var test_uri = "http://" + domain + nonce_path;
} catch (e) {
this.log(WARN, "explosion in safeToSecureCookie for " + domain + "\n"
+ "(" + e + ")");
return false;
}
this.log(DBUG, "Testing securecookie applicability with " + test_uri);
for (var i = 0; i < rs.length; ++i) {
if (!rs[i].active) continue;
var rewrite = rs[i].apply(test_uri);
if (rewrite) {
this.log(DBUG, "Safe to secure cookie for " + test_uri + ": " + rewrite);
return true;
}
}
this.log(DBUG, "Unsafe to secure cookie for " + test_uri);
return false;
}
};