gecko-dev/security/manager/tools/genHPKPStaticPins.js

586 lines
20 KiB
JavaScript

/* 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/. */
// How to run this file:
// 1. [obtain firefox source code]
// 2. [build/obtain firefox binaries]
// 3. run `[path to]/run-mozilla.sh [path to]/xpcshell \
// [path to]/genHPKPStaticpins.js \
// [absolute path to]/PreloadedHPKPins.json \
// [absolute path to]/default-ee.der \
// [absolute path to]/StaticHPKPins.h
if (arguments.length != 3) {
throw "Usage: genHPKPStaticPins.js " +
"<absolute path to PreloadedHPKPins.json> " +
"<absolute path to default-ee.der> " +
"<absolute path to StaticHPKPins.h>";
}
const { 'classes': Cc, 'interfaces': Ci, 'utils': Cu, 'results': Cr } = Components;
let { NetUtil } = Cu.import("resource://gre/modules/NetUtil.jsm", {});
let { FileUtils } = Cu.import("resource://gre/modules/FileUtils.jsm", {});
let { Services } = Cu.import("resource://gre/modules/Services.jsm", {});
let gCertDB = Cc["@mozilla.org/security/x509certdb;1"]
.getService(Ci.nsIX509CertDB);
const BUILT_IN_NICK_PREFIX = "Builtin Object Token:";
const SHA1_PREFIX = "sha1/";
const SHA256_PREFIX = "sha256/";
const GOOGLE_PIN_PREFIX = "GOOGLE_PIN_";
// Pins expire in 14 weeks (6 weeks on Beta + 8 weeks on stable)
const PINNING_MINIMUM_REQUIRED_MAX_AGE = 60 * 60 * 24 * 7 * 14;
const FILE_HEADER = "/* This Source Code Form is subject to the terms of the Mozilla Public\n" +
" * License, v. 2.0. If a copy of the MPL was not distributed with this\n" +
" * file, You can obtain one at http://mozilla.org/MPL/2.0/. */\n" +
"\n" +
"/*****************************************************************************/\n" +
"/* This is an automatically generated file. If you're not */\n" +
"/* PublicKeyPinningService.cpp, you shouldn't be #including it. */\n" +
"/*****************************************************************************/\n" +
"#include <stdint.h>" +
"\n";
const DOMAINHEADER = "/* Domainlist */\n" +
"struct TransportSecurityPreload {\n" +
" const char* mHost;\n" +
" const bool mIncludeSubdomains;\n" +
" const bool mTestMode;\n" +
" const bool mIsMoz;\n" +
" const int32_t mId;\n" +
" const StaticPinset *pinset;\n" +
"};\n\n";
const PINSETDEF = "/* Pinsets are each an ordered list by the actual value of the fingerprint */\n" +
"struct StaticFingerprints {\n" +
" const size_t size;\n" +
" const char* const* data;\n" +
"};\n\n" +
"struct StaticPinset {\n" +
" const StaticFingerprints* sha1;\n" +
" const StaticFingerprints* sha256;\n" +
"};\n\n";
// Command-line arguments
var gStaticPins = parseJson(arguments[0]);
var gTestCertFile = arguments[1];
// Open the output file.
let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
file.initWithPath(arguments[2]);
let gFileOutputStream = FileUtils.openSafeFileOutputStream(file);
function writeString(string) {
gFileOutputStream.write(string, string.length);
}
function readFileToString(filename) {
let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
file.initWithPath(filename);
let stream = Cc["@mozilla.org/network/file-input-stream;1"]
.createInstance(Ci.nsIFileInputStream);
stream.init(file, -1, 0, 0);
let buf = NetUtil.readInputStreamToString(stream, stream.available());
return buf;
}
function stripComments(buf) {
var lines = buf.split("\n");
let entryRegex = /^\s*\/\//;
let data = "";
for (let i = 0; i < lines.length; ++i) {
let match = entryRegex.exec(lines[i]);
if (!match) {
data = data + lines[i];
}
}
return data;
}
function isBuiltinToken(tokenName) {
return tokenName == "Builtin Object Token";
}
function isCertBuiltIn(cert) {
let tokenNames = cert.getAllTokenNames({});
if (!tokenNames) {
return false;
}
if (tokenNames.some(isBuiltinToken)) {
return true;
}
return false;
}
function download(filename) {
var req = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
.createInstance(Ci.nsIXMLHttpRequest);
req.open("GET", filename, false); // doing the request synchronously
try {
req.send();
}
catch (e) {
throw "ERROR: problem downloading '" + filename + "': " + e;
}
if (req.status != 200) {
throw("ERROR: problem downloading '" + filename + "': status " +
req.status);
}
var resultDecoded;
try {
resultDecoded = atob(req.responseText);
}
catch (e) {
throw "ERROR: could not decode data as base64 from '" + filename + "': " + e;
}
return resultDecoded;
}
function downloadAsJson(filename) {
// we have to filter out '//' comments
var result = download(filename).replace(/\/\/[^\n]*\n/g, "");
var data = null;
try {
data = JSON.parse(result);
}
catch (e) {
throw "ERROR: could not parse data from '" + filename + "': " + e;
}
return data;
}
// Returns a Subject Public Key Digest from the given pem, if it exists.
function getSKDFromPem(pem) {
let cert = gCertDB.constructX509FromBase64(pem, pem.length);
return cert.sha256SubjectPublicKeyInfoDigest;
}
// Downloads the static certs file and tries to map Google Chrome nicknames
// to Mozilla nicknames, as well as storing any hashes for pins for which we
// don't have root PEMs. Each entry consists of a line containing the name of
// the pin followed either by a hash in the format "sha1/" + base64(hash), or
// a PEM encoded certificate. For certificates that we have in our database,
// return a map of Google's nickname to ours. For ones that aren't return a
// map of Google's nickname to sha1 values. This code is modeled after agl's
// https://github.com/agl/transport-security-state-generate, which doesn't
// live in the Chromium repo because go is not an official language in
// Chromium.
// For all of the entries in this file:
// - If the entry has a hash format, find the Mozilla pin name (cert nickname)
// and stick the hash into certSKDToName
// - If the entry has a PEM format, parse the PEM, find the Mozilla pin name
// and stick the hash in certSKDToName
// We MUST be able to find a corresponding cert nickname for the Chrome names,
// otherwise we skip all pinsets referring to that Chrome name.
function downloadAndParseChromeCerts(filename, certSKDToName) {
// Prefixes that we care about.
const BEGIN_CERT = "-----BEGIN CERTIFICATE-----";
const END_CERT = "-----END CERTIFICATE-----";
// Parsing states.
const PRE_NAME = 0;
const POST_NAME = 1;
const IN_CERT = 2;
let state = PRE_NAME;
let lines = download(filename).split("\n");
let name = "";
let pemCert = "";
let hash = "";
let chromeNameToHash = {};
let chromeNameToMozName = {}
for (let i = 0; i < lines.length; ++i) {
let line = lines[i];
// Skip comments and newlines.
if (line.length == 0 || line[0] == '#') {
continue;
}
switch(state) {
case PRE_NAME:
chromeName = line;
state = POST_NAME;
break;
case POST_NAME:
if (line.startsWith(SHA1_PREFIX) ||
line.startsWith(SHA256_PREFIX)) {
if (line.startsWith(SHA1_PREFIX)) {
hash = line.substring(SHA1_PREFIX.length);
} else if (line.startsWith(SHA256_PREFIX)) {
hash = line.substring(SHA256_PREFIX);
}
// Store the entire prefixed hash, so we can disambiguate sha1 from
// sha256 later.
chromeNameToHash[chromeName] = line;
certNameToSKD[chromeName] = hash;
certSKDToName[hash] = chromeName;
state = PRE_NAME;
} else if (line.startsWith(BEGIN_CERT)) {
state = IN_CERT;
} else {
throw "ERROR: couldn't parse Chrome certificate file " + line;
}
break;
case IN_CERT:
if (line.startsWith(END_CERT)) {
state = PRE_NAME;
hash = getSKDFromPem(pemCert);
pemCert = "";
if (hash in certSKDToName) {
mozName = certSKDToName[hash];
} else {
// Not one of our built-in certs. Prefix the name with
// GOOGLE_PIN_.
mozName = GOOGLE_PIN_PREFIX + chromeName;
dump("Can't find hash in builtin certs for Chrome nickname " +
chromeName + ", inserting " + mozName + "\n");
certSKDToName[hash] = mozName;
certNameToSKD[mozName] = hash;
}
chromeNameToMozName[chromeName] = mozName;
} else {
pemCert += line;
}
break;
default:
throw "ERROR: couldn't parse Chrome certificate file " + line;
}
}
return [ chromeNameToHash, chromeNameToMozName ];
}
// We can only import pinsets from chrome if for every name in the pinset:
// - We have a hash from Chrome's static certificate file
// - We have a builtin cert
// If the pinset meets these requirements, we store a map array of pinset
// objects:
// {
// pinset_name : {
// // Array of names with entries in certNameToSKD
// sha1_hashes: [],
// sha256_hashes: []
// }
// }
// and an array of imported pinset entries:
// { name: string, include_subdomains: boolean, test_mode: boolean,
// pins: pinset_name }
function downloadAndParseChromePins(filename,
chromeNameToHash,
chromeNameToMozName,
certNameToSKD,
certSKDToName) {
let chromePreloads = downloadAsJson(filename);
let chromePins = chromePreloads.pinsets;
let chromeImportedPinsets = {};
let chromeImportedEntries = [];
chromePins.forEach(function(pin) {
let valid = true;
let pinset = { name: pin.name, sha1_hashes: [], sha256_hashes: [] };
// Translate the Chrome pinset format to ours
pin.static_spki_hashes.forEach(function(name) {
if (name in chromeNameToHash) {
let hash = chromeNameToHash[name];
if (hash.startsWith(SHA1_PREFIX)) {
hash = hash.substring(SHA1_PREFIX.length);
pinset.sha1_hashes.push(certSKDToName[hash]);
} else if (hash.startsWith(SHA256_PREFIX)) {
hash = hash.substring(SHA256_PREFIX.length);
pinset.sha256_hashes.push(certSKDToName[hash]);
} else {
throw("Unsupported hash type: " + chromeNameToHash[name]);
}
// We should have already added hashes for all of these when we
// imported the certificate file.
if (!certNameToSKD[name]) {
throw("No hash for name: " + name);
}
} else if (name in chromeNameToMozName) {
pinset.sha256_hashes.push(chromeNameToMozName[name]);
} else {
dump("Skipping Chrome pinset " + pinset.name + ", couldn't find " +
"builtin " + name + " from cert file\n");
valid = false;
}
});
if (valid) {
chromeImportedPinsets[pinset.name] = pinset;
}
});
// Grab the domain entry lists. Chrome's entry format is similar to
// ours, except theirs includes a HSTS mode.
const cData = gStaticPins.chromium_data;
let entries = chromePreloads.entries;
entries.forEach(function(entry) {
let pinsetName = cData.substitute_pinsets[entry.pins];
if (!pinsetName) {
pinsetName = entry.pins;
}
let isProductionDomain =
(cData.production_domains.indexOf(entry.name) != -1);
let isProductionPinset =
(cData.production_pinsets.indexOf(pinsetName) != -1);
let excludeDomain =
(cData.exclude_domains.indexOf(entry.name) != -1);
let isTestMode = !isProductionPinset && !isProductionDomain;
if (entry.pins && !excludeDomain && chromeImportedPinsets[entry.pins]) {
chromeImportedEntries.push({
name: entry.name,
include_subdomains: entry.include_subdomains,
test_mode: isTestMode,
is_moz: false,
pins: pinsetName });
}
});
return [ chromeImportedPinsets, chromeImportedEntries ];
}
// Returns a pair of maps [certNameToSKD, certSKDToName] between cert
// nicknames and digests of the SPKInfo for the mozilla trust store
function loadNSSCertinfo(derTestFile, extraCertificates) {
let allCerts = gCertDB.getCerts();
let enumerator = allCerts.getEnumerator();
let certNameToSKD = {};
let certSKDToName = {};
while (enumerator.hasMoreElements()) {
let cert = enumerator.getNext().QueryInterface(Ci.nsIX509Cert);
if (!isCertBuiltIn(cert)) {
continue;
}
let name = cert.nickname.substr(BUILT_IN_NICK_PREFIX.length);
let SKD = cert.sha256SubjectPublicKeyInfoDigest;
certNameToSKD[name] = SKD;
certSKDToName[SKD] = name;
}
for (let cert of extraCertificates) {
let name = cert.commonName;
let SKD = cert.sha256SubjectPublicKeyInfoDigest;
certNameToSKD[name] = SKD;
certSKDToName[SKD] = name;
}
{
// A certificate for *.example.com.
let der = readFileToString(derTestFile);
let testCert = gCertDB.constructX509(der, der.length);
// We can't include this cert in the previous loop, because it skips
// non-builtin certs and the nickname is not built-in to the cert.
let name = "End Entity Test Cert";
let SKD = testCert.sha256SubjectPublicKeyInfoDigest;
certNameToSKD[name] = SKD;
certSKDToName[SKD] = name;
}
return [certNameToSKD, certSKDToName];
}
function parseJson(filename) {
let json = stripComments(readFileToString(filename));
return JSON.parse(json);
}
function nameToAlias(certName) {
// change the name to a string valid as a c identifier
// remove non-ascii characters
certName = certName.replace( /[^[:ascii:]]/g, "_");
// replace non word characters
certName = certName.replace(/[^A-Za-z0-9]/g ,"_");
return "k" + certName + "Fingerprint";
}
function compareByName (a, b) {
return a.name.localeCompare(b.name);
}
function genExpirationTime() {
let now = new Date();
let nowMillis = now.getTime();
let expirationMillis = nowMillis + (PINNING_MINIMUM_REQUIRED_MAX_AGE * 1000);
let expirationMicros = expirationMillis * 1000;
return "static const PRTime kPreloadPKPinsExpirationTime = INT64_C(" +
expirationMicros +");\n";
}
function writeFullPinset(certNameToSKD, certSKDToName, pinset) {
// We aren't guaranteed to have sha1 hashes in our own imported pins.
let prefix = "kPinset_" + pinset.name;
let sha1Name = "nullptr";
let sha256Name = "nullptr";
if (pinset.sha1_hashes && pinset.sha1_hashes.length > 0) {
writeFingerprints(certNameToSKD, certSKDToName, pinset.name,
pinset.sha1_hashes, "sha1");
sha1Name = "&" + prefix + "_sha1";
}
if (pinset.sha256_hashes && pinset.sha256_hashes.length > 0) {
writeFingerprints(certNameToSKD, certSKDToName, pinset.name,
pinset.sha256_hashes, "sha256");
sha256Name = "&" + prefix + "_sha256";
}
writeString("static const StaticPinset " + prefix + " = {\n" +
" " + sha1Name + ",\n " + sha256Name + "\n};\n\n");
}
function writeFingerprints(certNameToSKD, certSKDToName, name, hashes, type) {
let varPrefix = "kPinset_" + name + "_" + type;
writeString("static const char* " + varPrefix + "_Data[] = {\n");
let SKDList = [];
for (let certName of hashes) {
if (!(certName in certNameToSKD)) {
throw "Can't find " + certName + " in certNameToSKD";
}
SKDList.push(certNameToSKD[certName]);
}
for (let skd of SKDList.sort()) {
writeString(" " + nameToAlias(certSKDToName[skd]) + ",\n");
}
if (hashes.length == 0) {
// ANSI C requires that an initialiser list be non-empty.
writeString(" 0\n");
}
writeString("};\n");
writeString("static const StaticFingerprints " + varPrefix + " = {\n " +
"sizeof(" + varPrefix + "_Data) / sizeof(const char*),\n " + varPrefix +
"_Data\n};\n\n");
}
function writeEntry(entry) {
let printVal = " { \"" + entry.name + "\",\ ";
if (entry.include_subdomains) {
printVal += "true, ";
} else {
printVal += "false, ";
}
// Default to test mode if not specified.
let testMode = true;
if (entry.hasOwnProperty("test_mode")) {
testMode = entry.test_mode;
}
if (testMode) {
printVal += "true, ";
} else {
printVal += "false, ";
}
if (entry.is_moz || (entry.pins.indexOf("mozilla") != -1 &&
entry.pins != "mozilla_test")) {
printVal += "true, ";
} else {
printVal += "false, ";
}
if (entry.id >= 256) {
throw("Not enough buckets in histogram");
}
if (entry.id >= 0) {
printVal += entry.id + ", ";
} else {
printVal += "-1, ";
}
printVal += "&kPinset_" + entry.pins;
printVal += " },\n";
writeString(printVal);
}
function writeDomainList(chromeImportedEntries) {
writeString("/* Sort hostnames for binary search. */\n");
writeString("static const TransportSecurityPreload " +
"kPublicKeyPinningPreloadList[] = {\n");
let count = 0;
let sortedEntries = gStaticPins.entries;
sortedEntries.push.apply(sortedEntries, chromeImportedEntries);
for (let entry of sortedEntries.sort(compareByName)) {
count++;
writeEntry(entry);
}
writeString("};\n");
writeString("\n// Pinning Preload List Length = " + count + ";\n");
writeString("\nstatic const int32_t kUnknownId = -1;\n");
}
function writeFile(certNameToSKD, certSKDToName,
chromeImportedPinsets, chromeImportedEntries) {
// Compute used pins from both Chrome's and our pinsets, so we can output
// them later.
usedFingerprints = {};
gStaticPins.pinsets.forEach(function(pinset) {
// We aren't guaranteed to have sha1_hashes in our own JSON.
if (pinset.sha1_hashes) {
pinset.sha1_hashes.forEach(function(name) {
usedFingerprints[name] = true;
});
}
if (pinset.sha256_hashes) {
pinset.sha256_hashes.forEach(function(name) {
usedFingerprints[name] = true;
});
}
});
for (let key in chromeImportedPinsets) {
let pinset = chromeImportedPinsets[key];
pinset.sha1_hashes.forEach(function(name) {
usedFingerprints[name] = true;
});
pinset.sha256_hashes.forEach(function(name) {
usedFingerprints[name] = true;
});
}
writeString(FILE_HEADER);
// Write actual fingerprints.
Object.keys(usedFingerprints).sort().forEach(function(certName) {
if (certName) {
writeString("/* " + certName + " */\n");
writeString("static const char " + nameToAlias(certName) + "[] =\n");
writeString(" \"" + certNameToSKD[certName] + "\";\n");
writeString("\n");
}
});
// Write the pinsets
writeString(PINSETDEF);
writeString("/* PreloadedHPKPins.json pinsets */\n");
gStaticPins.pinsets.sort(compareByName).forEach(function(pinset) {
writeFullPinset(certNameToSKD, certSKDToName, pinset);
});
writeString("/* Chrome static pinsets */\n");
for (let key in chromeImportedPinsets) {
writeFullPinset(certNameToSKD, certSKDToName, chromeImportedPinsets[key]);
}
// Write the domainlist entries.
writeString(DOMAINHEADER);
writeDomainList(chromeImportedEntries);
writeString("\n");
writeString(genExpirationTime());
}
function loadExtraCertificates(certStringList) {
let constructedCerts = [];
for (let certString of certStringList) {
constructedCerts.push(gCertDB.constructX509FromBase64(certString));
}
return constructedCerts;
}
let extraCertificates = loadExtraCertificates(gStaticPins.extra_certificates);
let [ certNameToSKD, certSKDToName ] = loadNSSCertinfo(gTestCertFile,
extraCertificates);
let [ chromeNameToHash, chromeNameToMozName ] = downloadAndParseChromeCerts(
gStaticPins.chromium_data.cert_file_url, certSKDToName);
let [ chromeImportedPinsets, chromeImportedEntries ] =
downloadAndParseChromePins(gStaticPins.chromium_data.json_file_url,
chromeNameToHash, chromeNameToMozName, certNameToSKD, certSKDToName);
writeFile(certNameToSKD, certSKDToName, chromeImportedPinsets,
chromeImportedEntries);
FileUtils.closeSafeFileOutputStream(gFileOutputStream);