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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/auth_util.h"
#include "base/base64.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "crypto/hmac.h"
#include "crypto/sha2.h"
#include "net/base/net_errors.h"
#include "net/socket/ssl_socket.h"
namespace remoting {
namespace protocol {
const char kClientAuthSslExporterLabel[] =
"EXPORTER-remoting-channel-auth-client";
const char kHostAuthSslExporterLabel[] =
"EXPORTER-remoting-channel-auth-host";
const char kSslFakeHostName[] = "chromoting";
std::string GenerateSupportAuthToken(const std::string& jid,
const std::string& access_code) {
std::string sha256 = crypto::SHA256HashString(jid + " " + access_code);
std::string sha256_base64;
if (!base::Base64Encode(sha256, &sha256_base64)) {
LOG(FATAL) << "Failed to encode auth token";
}
return sha256_base64;
}
bool VerifySupportAuthToken(const std::string& jid,
const std::string& access_code,
const std::string& auth_token) {
std::string expected_token =
GenerateSupportAuthToken(jid, access_code);
return expected_token == auth_token;
}
// static
std::string GetAuthBytes(net::SSLSocket* socket,
const base::StringPiece& label,
const base::StringPiece& shared_secret) {
// Get keying material from SSL.
unsigned char key_material[kAuthDigestLength];
int export_result = socket->ExportKeyingMaterial(
label, false, "", key_material, kAuthDigestLength);
if (export_result != net::OK) {
LOG(ERROR) << "Error fetching keying material: " << export_result;
return std::string();
}
// Generate auth digest based on the keying material and shared secret.
crypto::HMAC response(crypto::HMAC::SHA256);
if (!response.Init(key_material, kAuthDigestLength)) {
NOTREACHED() << "HMAC::Init failed";
return std::string();
}
unsigned char out_bytes[kAuthDigestLength];
if (!response.Sign(shared_secret, out_bytes, kAuthDigestLength)) {
NOTREACHED() << "HMAC::Sign failed";
return std::string();
}
return std::string(out_bytes, out_bytes + kAuthDigestLength);
}
} // namespace protocol
} // namespace remoting
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