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/*
* Copyright (c) 2015-2016 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/SASL/WindowsGSSAPIClientAuthenticator.h>
#include <Swiften/Base/Log.h>
#include <Swiften/SASL/WindowsAuthentication.h>
#include <Swiften/SASL/WindowsServicePrincipalName.h>
#define SECURITY_LAYER_NONE 1
namespace Swift {
WindowsGSSAPIClientAuthenticator::WindowsGSSAPIClientAuthenticator(const std::string& hostname, const std::string& domainname, int port) : ClientAuthenticator("GSSAPI"), step_(BuildingSecurityContext), error_(false), haveCredentialsHandle_(false), haveContextHandle_(false), haveCompleteContext_(false) {
WindowsServicePrincipalName servicePrincipalName(domainname);
servicePrincipalName.setInstanceName(hostname);
if ((port != -1) && (port != 5222)) {
servicePrincipalName.setInstancePort(port);
}
servicePrincipalNameString_ = servicePrincipalName.toString();
errorCode_ = acquireCredentialsHandle(&credentialsHandle_);
if (isError()) {
return;
}
else {
haveCredentialsHandle_ = true;
}
buildSecurityContext(boost::optional<ByteArray>());
}
WindowsGSSAPIClientAuthenticator::~WindowsGSSAPIClientAuthenticator() {
if (haveContextHandle_) {
deleteSecurityContext(&contextHandle_);
}
if (haveCredentialsHandle_) {
freeCredentialsHandle(&credentialsHandle_);
}
}
boost::optional<SafeByteArray> WindowsGSSAPIClientAuthenticator::getResponse() const {
SWIFT_LOG(debug) << "response_.size(): " << response_.size() << std::endl;
return response_;
}
bool WindowsGSSAPIClientAuthenticator::setChallenge(const boost::optional<ByteArray>& challengeData) {
/* Following http://tools.ietf.org/html/rfc4752, https://msdn.microsoft.com/en-us/library/windows/desktop/aa380496%28v=vs.85%29.aspx */
if (step_ == BuildingSecurityContext) {
buildSecurityContext(challengeData);
}
else if (step_ == SecurityLayerNegotiation) {
if (!challengeData) {
SWIFT_LOG(debug) << "Empty message received from the server" << std::endl;
error_ = true;
return false;
}
SafeByteArray challenge;
errorCode_ = decryptMessage(&contextHandle_, challengeData.get(), challenge);
if (isError()) {
return false;
}
if (challenge.size() != 4) {
SWIFT_LOG(debug) << "Token received from the server of incorrect length: " << challenge.size() << std::endl;
error_ = true;
return false;
}
unsigned char* challengePointer = vecptr(challenge);
unsigned char serverSecurityLayer = challengePointer[0];
if (serverSecurityLayer == 0) {
SWIFT_LOG(debug) << "Server supports unknown security layer, assuming no security layer" << std::endl;
serverSecurityLayer = SECURITY_LAYER_NONE;
}
else if (serverSecurityLayer == SECURITY_LAYER_NONE) {
SWIFT_LOG(debug) << "Server supports no security layer" << std::endl;
}
else {
SWIFT_LOG(debug) << "Server supports security layer" << std::endl;
}
unsigned int serverMaximumBuffer = (challengePointer[1] << 16) |
(challengePointer[2] << 8) |
(challengePointer[3] << 0);
if ((serverSecurityLayer == SECURITY_LAYER_NONE) && (serverMaximumBuffer != 0)) {
SWIFT_LOG(debug) << "Server supports no security layer but has maximum buffer size" << serverMaximumBuffer << std::endl;
error_ = true;
return false;
}
SafeByteArray message(4);
/* Commenting this out as streamSizes was not obtained before
if (message.size() > streamSizes_.cbMaximumMessage) {
error_ = true;
return false;
} */
unsigned char* messagePointer = vecptr(message);
messagePointer[0] = SECURITY_LAYER_NONE;
/* The next 3 bytes indicate the client's maximum size buffer which is set to 0 as we do not support a security layer */
messagePointer[1] = 0;
messagePointer[2] = 0;
messagePointer[3] = 0;
/* The authorization identity is omitted as it is the same as the authentication identity */
errorCode_ = encryptMessage(&contextHandle_, sizes_, message, response_);
if (isError()) {
return false;
}
step_ = ServerAuthenticated;
}
if (isError()) {
return false;
}
return true;
}
bool WindowsGSSAPIClientAuthenticator::isError() {
if (error_) {
return true;
}
if (!errorCode_) {
return false;
}
return true;
}
void WindowsGSSAPIClientAuthenticator::buildSecurityContext(const boost::optional<ByteArray>& inputToken) {
ULONG contextSupported;
/* An XMPP server may not support Kerberos encryption or SASL security layer so not requesting integrity or confidentiality */
errorCode_ = initializeSecurityContext(inputToken, servicePrincipalNameString_, &credentialsHandle_, haveContextHandle_, &contextHandle_, ISC_REQ_MUTUAL_AUTH, &contextSupported, &haveCompleteContext_, response_);
if (isError()) {
return;
}
haveContextHandle_ = true;
if (!haveCompleteContext_) {
return;
}
if (contextSupported & ISC_REQ_MUTUAL_AUTH == 0) {
SWIFT_LOG(debug) << "Mutual authentication not supported" << std::endl;
error_ = true;
return;
}
errorCode_ = queryContextAttributes(&contextHandle_, SECPKG_ATTR_SIZES, &sizes_);
if (isError()) {
return;
}
/* Commenting this out as it gives the error code 0x80090302: The function requested is not supported
errorCode_ = queryContextAttributes(&contextHandle_, SECPKG_ATTR_STREAM_SIZES, &streamSizes_);
if (isError()) {
return;
}*/
SecPkgContext_Names names;
errorCode_ = queryContextAttributes(&contextHandle_, SECPKG_ATTR_NAMES, &names);
if (isError()) {
return;
}
userName_ = names.sUserName;
SWIFT_LOG(debug) << "User name: " << userName_ << std::endl;
std::size_t position = userName_.find("\\");
clientName_ = userName_.substr(position + 1);
SWIFT_LOG(debug) << "Client name: " << clientName_ << std::endl;
serverName_ = userName_.substr(0, position);
SWIFT_LOG(debug) << "Server name: " << serverName_ << std::endl;
freeContextBuffer(names.sUserName);
step_ = SecurityLayerNegotiation;
}
}
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Swift