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/* -*- indent-tabs-mode: nil; js-indent-level: 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
import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
import { PrivateBrowsingUtils } from "resource://gre/modules/PrivateBrowsingUtils.sys.mjs";
import { TelemetryController } from "resource://gre/modules/TelemetryController.sys.mjs";
const PREF_SSL_IMPACT_ROOTS = [
"security.tls.version.",
"security.ssl3.",
"security.tls13.",
];
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
BrowserUtils: "resource://gre/modules/BrowserUtils.sys.mjs",
HomePage: "resource:///modules/HomePage.sys.mjs",
});
class CaptivePortalObserver {
constructor(actor) {
this.actor = actor;
Services.obs.addObserver(this, "captive-portal-login-abort");
Services.obs.addObserver(this, "captive-portal-login-success");
}
stop() {
Services.obs.removeObserver(this, "captive-portal-login-abort");
Services.obs.removeObserver(this, "captive-portal-login-success");
}
observe(aSubject, aTopic) {
switch (aTopic) {
case "captive-portal-login-abort":
case "captive-portal-login-success":
// Send a message to the content when a captive portal is freed
// so that error pages can refresh themselves.
this.actor.sendAsyncMessage("AboutNetErrorCaptivePortalFreed");
break;
}
}
}
export class NetErrorParent extends JSWindowActorParent {
constructor() {
super();
this.captivePortalObserver = new CaptivePortalObserver(this);
}
didDestroy() {
if (this.captivePortalObserver) {
this.captivePortalObserver.stop();
}
}
get browser() {
return this.browsingContext.top.embedderElement;
}
hasChangedCertPrefs() {
let prefSSLImpact = PREF_SSL_IMPACT_ROOTS.reduce((prefs, root) => {
return prefs.concat(Services.prefs.getChildList(root));
}, []);
for (let prefName of prefSSLImpact) {
if (Services.prefs.prefHasUserValue(prefName)) {
return true;
}
}
return false;
}
async ReportBlockingError(bcID, scheme, host, port, path, xfoAndCspInfo) {
// For reporting X-Frame-Options error and CSP: frame-ancestors errors, We
// are collecting 4 pieces of information.
// 1. The X-Frame-Options in the response header.
// 2. The CSP: frame-ancestors in the response header.
// 3. The URI of the frame who triggers this error.
// 4. The top-level URI which loads the frame.
//
// We will exclude the query strings from the reporting URIs.
//
// More details about the data we send can be found in
//
let topBC = BrowsingContext.get(bcID).top;
let topURI = topBC.currentWindowGlobal.documentURI;
// Get the URLs without query strings.
let frame_uri = `${scheme}://${host}${port == -1 ? "" : ":" + port}${path}`;
let top_uri = `${topURI.scheme}://${topURI.hostPort}${topURI.filePath}`;
TelemetryController.submitExternalPing(
"xfocsp-error-report",
{
...xfoAndCspInfo,
frame_hostname: host,
top_hostname: topURI.host,
frame_uri,
top_uri,
},
{ addClientId: false, addEnvironment: false }
);
}
/**
* Return the default start page for the cases when the user's own homepage is
* infected, so we can get them somewhere safe.
*/
getDefaultHomePage(win) {
let url;
if (
!PrivateBrowsingUtils.isWindowPrivate(win) &&
AppConstants.MOZ_BUILD_APP == "browser"
) {
url = lazy.HomePage.getDefault();
}
url ||= win.BROWSER_NEW_TAB_URL || "about:blank";
// If url is a pipe-delimited set of pages, just take the first one.
if (url.includes("|")) {
url = url.split("|")[0];
}
return url;
}
/**
* Re-direct the browser to the previous page or a known-safe page if no
* previous page is found in history. This function is used when the user
* browses to a secure page with certificate issues and is presented with
* about:certerror. The "Go Back" button should take the user to the previous
* or a default start page so that even when their own homepage is on a server
* that has certificate errors, we can get them somewhere safe.
*/
goBackFromErrorPage(browser) {
if (!browser.canGoBack) {
// If the unsafe page is the first or the only one in history, go to the
// start page.
browser.fixupAndLoadURIString(
this.getDefaultHomePage(browser.ownerGlobal),
{
triggeringPrincipal:
Services.scriptSecurityManager.getSystemPrincipal(),
}
);
} else {
browser.goBack();
}
}
/**
* This function does a canary request to a reliable, maintained endpoint, in
* order to help network code detect a system-wide man-in-the-middle.
*/
primeMitm(browser) {
// If we already have a mitm canary issuer stored, then don't bother with the
// extra request. This will be cleared on every update ping.
if (Services.prefs.getStringPref("security.pki.mitm_canary_issuer", null)) {
return;
}
let url = Services.prefs.getStringPref(
"security.certerrors.mitm.priming.endpoint"
);
let request = new XMLHttpRequest({ mozAnon: true });
request.open("HEAD", url);
request.channel.loadFlags |= Ci.nsIRequest.LOAD_BYPASS_CACHE;
request.channel.loadFlags |= Ci.nsIRequest.INHIBIT_CACHING;
request.addEventListener("error", () => {
// Make sure the user is still on the cert error page.
if (!browser.documentURI.spec.startsWith("about:certerror")) {
return;
}
let secInfo = request.channel.securityInfo;
if (secInfo.errorCodeString != "SEC_ERROR_UNKNOWN_ISSUER") {
return;
}
// When we get to this point there's already something deeply wrong, it's very likely
// that there is indeed a system-wide MitM.
if (secInfo.serverCert && secInfo.serverCert.issuerName) {
// Grab the issuer of the certificate used in the exchange and store it so that our
// network-level MitM detection code has a comparison baseline.
Services.prefs.setStringPref(
"security.pki.mitm_canary_issuer",
secInfo.serverCert.issuerName
);
// MitM issues are sometimes caused by software not registering their root certs in the
// Firefox root store. We might opt for using third party roots from the system root store.
if (
Services.prefs.getBoolPref(
"security.certerrors.mitm.auto_enable_enterprise_roots"
)
) {
if (
!Services.prefs.getBoolPref("security.enterprise_roots.enabled")
) {
// Loading enterprise roots happens on a background thread, so wait for import to finish.
lazy.BrowserUtils.promiseObserved(
"psm:enterprise-certs-imported"
).then(() => {
if (browser.documentURI.spec.startsWith("about:certerror")) {
browser.reload();
}
});
Services.prefs.setBoolPref(
"security.enterprise_roots.enabled",
true
);
// Record that this pref was automatically set.
Services.prefs.setBoolPref(
"security.enterprise_roots.auto-enabled",
true
);
}
} else {
// Need to reload the page to make sure network code picks up the canary issuer pref.
browser.reload();
}
}
});
request.send(null);
}
displayOfflineSupportPage(supportPageSlug) {
const AVAILABLE_PAGES = ["connection-not-secure", "time-errors"];
if (!AVAILABLE_PAGES.includes(supportPageSlug)) {
console.log(
`[Not supported] Offline support is not yet available for ${supportPageSlug} errors.`
);
return;
}
let triggeringPrincipal =
Services.scriptSecurityManager.getSystemPrincipal();
this.browser.loadURI(Services.io.newURI(offlinePagePath), {
triggeringPrincipal,
});
}
receiveMessage(message) {
switch (message.name) {
case "Browser:EnableOnlineMode":
// Reset network state and refresh the page.
Services.io.offline = false;
this.browser.reload();
break;
case "Browser:OpenCaptivePortalPage":
this.browser.ownerGlobal.CaptivePortalWatcher.ensureCaptivePortalTab();
break;
case "Browser:PrimeMitm":
this.primeMitm(this.browser);
break;
case "Browser:ResetEnterpriseRootsPref":
Services.prefs.clearUserPref("security.enterprise_roots.enabled");
Services.prefs.clearUserPref("security.enterprise_roots.auto-enabled");
break;
case "Browser:ResetSSLPreferences":
let prefSSLImpact = PREF_SSL_IMPACT_ROOTS.reduce((prefs, root) => {
return prefs.concat(Services.prefs.getChildList(root));
}, []);
for (let prefName of prefSSLImpact) {
Services.prefs.clearUserPref(prefName);
}
this.browser.reload();
break;
case "Browser:SSLErrorGoBack":
this.goBackFromErrorPage(this.browser);
break;
case "GetChangedCertPrefs":
let hasChangedCertPrefs = this.hasChangedCertPrefs();
this.sendAsyncMessage("HasChangedCertPrefs", {
hasChangedCertPrefs,
});
break;
case "ReportBlockingError":
this.ReportBlockingError(
this.browsingContext.id,
message.data.scheme,
message.data.host,
message.data.port,
message.data.path,
message.data.xfoAndCspInfo
);
break;
case "DisplayOfflineSupportPage":
this.displayOfflineSupportPage(message.data.supportPageSlug);
break;
case "Browser:CertExceptionError":
switch (message.data.elementId) {
case "viewCertificate": {
let certs = message.data.failedCertChain.map(certBase64 =>
encodeURIComponent(certBase64)
);
let certsStringURL = certs.map(elem => `cert=${elem}`);
certsStringURL = certsStringURL.join("&");
let url = `about:certificate?${certsStringURL}`;
let window = this.browser.ownerGlobal;
if (AppConstants.MOZ_BUILD_APP === "browser") {
window.switchToTabHavingURI(url, true, {});
} else {
window.open(url, "_blank");
}
break;
}
}
break;
case "Browser:AddTRRExcludedDomain":
let domain = message.data.hostname;
let excludedDomains = Services.prefs.getStringPref(
"network.trr.excluded-domains"
);
excludedDomains += `, ${domain}`;
Services.prefs.setStringPref(
"network.trr.excluded-domains",
excludedDomains
);
break;
case "OpenTRRPreferences":
let browser = this.browsingContext.top.embedderElement;
if (!browser) {
break;
}
let win = browser.ownerGlobal;
win.openPreferences("privacy-doh");
break;
}
}
}