1 files changed, 76 insertions, 0 deletions
diff --git a/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.cpp b/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.cpp
new file mode 100644
index 0000000..39f2672
--- /dev/null
+++ b/src/modules/AuthBackendChallengeResponse/AuthBackendChallengeResponse.cpp
@@ -0,0 +1,76 @@
+/*
+ * AuthBackendChallengeResponse.cpp
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "AuthBackendChallengeResponse.h"
+
+#include <Common/Hash.h>
+
+namespace Mad {
+namespace Modules {
+namespace AuthBackendChallengeResponse {
+
+const std::string AuthBackendChallengeResponse::methodName = "Challenge-Response";
+
+AuthBackendChallengeResponse::AuthContextChallengeResponse::AuthContextChallengeResponse(AuthBackendChallengeResponse *backend) : authenticated(false) {
+  challenge.reserve(20);
+
+  for(int i = 0; i < 20; ++i)
+    challenge.push_back(backend->randomGenerator());
+}
+
+boost::shared_ptr<Common::AuthContext> AuthBackendChallengeResponse::authenticate(boost::shared_ptr<Common::AuthProvider> provider, const std::string &subMethod,
+    const std::string &user, const std::vector<boost::uint8_t> &data, std::vector<boost::uint8_t> &response,
+    boost::shared_ptr<Common::AuthContext> context) throw(Core::Exception) {
+  if(context && dynamic_cast<AuthContextChallengeResponse*>(context.get()) == 0)
+    throw(Core::Exception(Core::Exception::INVALID_INPUT));
+
+  std::vector<std::string> allowedMethods = getSubMethods(provider);
+  if(std::find(allowedMethods.begin(), allowedMethods.end(), subMethod) == allowedMethods.end())
+    throw(Core::Exception(Core::Exception::INVALID_INPUT));
+
+  if(!context) {
+    boost::shared_ptr<AuthContextChallengeResponse> contextCR(new AuthContextChallengeResponse(this));
+    context = contextCR;
+
+    response.insert(response.end(), contextCR->challenge.begin(), contextCR->challenge.end());
+  }
+  else {
+    boost::shared_ptr<AuthContextChallengeResponse> contextCR = boost::dynamic_pointer_cast<AuthContextChallengeResponse>(context);
+
+    std::vector<boost::uint8_t> password = provider->getPassword(user, subMethod);
+    if(password.empty())
+      throw Core::Exception(Core::Exception::AUTHENTICATION);
+
+    password.insert(password.end(), contextCR->challenge.begin(), contextCR->challenge.end());
+
+    password = Common::Hash::hash(password, subMethod);
+
+    if(password.size() != data.size() || !std::equal(password.begin(), password.end(), data.begin()))
+      throw Core::Exception(Core::Exception::AUTHENTICATION);
+
+    contextCR->authenticated = true;
+  }
+
+
+  return context;
+}
+
+}
+}
+}