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/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
#include <Swiften/SASL/DIGESTMD5ClientAuthenticator.h>
#include <cassert>
#include <Swiften/StringCodecs/MD5.h>
#include <Swiften/StringCodecs/Hexify.h>
#include <Swiften/Base/Concat.h>
#include <Swiften/Base/Algorithm.h>
namespace Swift {
DIGESTMD5ClientAuthenticator::DIGESTMD5ClientAuthenticator(const std::string& host, const std::string& nonce) : ClientAuthenticator("DIGEST-MD5"), step(Initial), host(host), cnonce(nonce) {
}
bool DIGESTMD5ClientAuthenticator::canBeUsed() {
return MD5::isAllowedForCrypto();
}
boost::optional<SafeByteArray> DIGESTMD5ClientAuthenticator::getResponse() const {
if (step == Initial) {
return boost::optional<SafeByteArray>();
}
else if (step == Response) {
std::string realm;
if (challenge.getValue("realm")) {
realm = *challenge.getValue("realm");
}
std::string qop = "auth";
std::string digestURI = "xmpp/" + host;
std::string nc = "00000001";
// Compute the response value
ByteArray A1 = concat(
MD5::getHash(
concat(createSafeByteArray(getAuthenticationID().c_str()), createSafeByteArray(":"), createSafeByteArray(realm.c_str()), createSafeByteArray(":"), getPassword())),
createByteArray(":"), createByteArray(*challenge.getValue("nonce")), createByteArray(":"), createByteArray(cnonce));
if (!getAuthorizationID().empty()) {
append(A1, createByteArray(":" + getAuthenticationID()));
}
ByteArray A2 = createByteArray("AUTHENTICATE:" + digestURI);
std::string responseValue = Hexify::hexify(MD5::getHash(createByteArray(
Hexify::hexify(MD5::getHash(A1)) + ":"
+ *challenge.getValue("nonce") + ":" + nc + ":" + cnonce + ":" + qop + ":"
+ Hexify::hexify(MD5::getHash(A2)))));
DIGESTMD5Properties response;
response.setValue("username", getAuthenticationID());
if (!realm.empty()) {
response.setValue("realm", realm);
}
response.setValue("nonce", *challenge.getValue("nonce"));
response.setValue("cnonce", cnonce);
response.setValue("nc", "00000001");
response.setValue("qop", qop);
response.setValue("digest-uri", digestURI);
response.setValue("charset", "utf-8");
response.setValue("response", responseValue);
if (!getAuthorizationID().empty()) {
response.setValue("authzid", getAuthorizationID());
}
return createSafeByteArray(response.serialize());
}
else {
return boost::optional<SafeByteArray>();
}
}
bool DIGESTMD5ClientAuthenticator::setChallenge(const boost::optional<ByteArray>& challengeData) {
if (step == Initial) {
if (!challengeData) {
return false;
}
challenge = DIGESTMD5Properties::parse(*challengeData);
// Sanity checks
if (!challenge.getValue("nonce")) {
return false;
}
if (!challenge.getValue("charset") || *challenge.getValue("charset") != "utf-8") {
return false;
}
step = Response;
return true;
}
else {
step = Final;
// TODO: Check RSPAuth
return true;
}
}
}
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Swift