SASL Authentication for Clients

modules/saslplain.cpp

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2004-2018 ZNC, see the NOTICE file for details.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <znc/User.h>
+#include <znc/znc.h>
+
+class CSASLMechanismPlain : public CModule {
+  public:
+    MODCONSTRUCTOR(CSASLMechanismPlain) { AddHelpCommand(); }
+
+    EModRet OnClientSaslAuthenticate(const CString& sMechanism,
+                                     const CString& sBuffer, CString& sUser,
+                                     CString& sMechanismResponse,
+                                     bool& bAuthenticationSuccess) override {
+        if (!sMechanism.Equals("PLAIN")) {
+            return CONTINUE;
+        }
+
+        bAuthenticationSuccess = false;
+
+        CString sNullSeparator = std::string("\0", 1);
+        auto sAuthzId = sBuffer.Token(0, false, sNullSeparator);
+        auto sAuthcId = sBuffer.Token(1, false, sNullSeparator);
+        auto sPassword = sBuffer.Token(2, false, sNullSeparator);
+
+        if (sAuthzId.empty()) sAuthzId = sAuthcId;
+
+		auto pUser = CZNC::Get().FindUser(sAuthcId);
+
+        if (!sAuthcId.empty() && !sPassword.empty()) {
+            if (pUser->CheckPass(sPassword)) {
+                bAuthenticationSuccess = true;
+				sUser = sAuthcId;
+			}
+        }
+
+		return HALTMODS;
+	}
+
+    void OnGetSaslMechanisms(SCString& ssMechanisms) override {
+        ssMechanisms.insert("PLAIN");
+	}
+};
+
+template <>
+void TModInfo<CSASLMechanismPlain>(CModInfo& Info) {
+    Info.SetWikiPage("saslplain");
+}
+
+GLOBALMODULEDEFS(
+    CSASLMechanismPlain,
+    t_s("Allows users to authenticate via the PLAIN SASL mechanism."))