+/* $ModDesc: Provides support for IRC Authentication Layer (aka: atheme SASL) via AUTHENTICATE. */
+
+enum SaslState { SASL_INIT, SASL_COMM, SASL_DONE };
+enum SaslResult { SASL_OK, SASL_FAIL, SASL_ABORT };
+
+/**
+ * Tracks SASL authentication state like charybdis does. --nenolod
+ */
+class SaslAuthenticator : public classbase
+{
+ private:
+ InspIRCd *ServerInstance;
+ Module *Creator;
+ std::string agent;
+ User *user;
+ SaslState state;
+ SaslResult result;
+ bool state_announced;
+
+ public:
+ SaslAuthenticator(User *user_, std::string method, InspIRCd *instance, Module *ctor)
+ : ServerInstance(instance), Creator(ctor), user(user_), state(SASL_INIT), state_announced(false)
+ {
+ this->user->Extend("sasl_authenticator", this);
+
+ std::deque<std::string> params;
+ params.push_back("*");
+ params.push_back("SASL");
+ params.push_back(user->uuid);
+ params.push_back("*");
+ params.push_back("S");
+ params.push_back(method);
+
+ ServerInstance->PI->SendEncapsulatedData(params);
+ }
+
+ SaslResult GetSaslResult(std::string &result_)
+ {
+ if (result_ == "F")
+ return SASL_FAIL;
+
+ if (result_ == "A")
+ return SASL_ABORT;
+
+ return SASL_OK;
+ }
+
+ /* checks for and deals with a state change. */
+ SaslState ProcessInboundMessage(std::deque<std::string> &msg)
+ {
+ switch (this->state)
+ {
+ case SASL_INIT:
+ this->agent = msg[2];
+ this->user->Write("AUTHENTICATE %s", msg[5].c_str());
+ this->state = SASL_COMM;
+ break;
+ case SASL_COMM:
+ if (msg[2] != this->agent)
+ return this->state;
+
+ if (msg[4] != "D")
+ this->user->Write("AUTHENTICATE %s", msg[5].c_str());
+ else
+ {
+ this->state = SASL_DONE;
+ this->result = this->GetSaslResult(msg[5]);
+ }
+
+ break;
+ case SASL_DONE:
+ break;
+ default:
+ ServerInstance->Logs->Log("m_sasl", DEFAULT, "WTF: SaslState is not a known state (%d)", this->state);
+ break;
+ }
+
+ return this->state;
+ }
+
+ void Abort(void)
+ {
+ this->state = SASL_DONE;
+ this->result = SASL_ABORT;
+ }
+
+ bool SendClientMessage(const std::vector<std::string>& parameters)
+ {
+ if (this->state != SASL_COMM)
+ return true;
+
+ std::deque<std::string> params;
+ params.push_back("*");
+ params.push_back("SASL");
+ params.push_back(this->user->uuid);
+ params.push_back(this->agent);
+ params.push_back("C");
+
+ params.insert(params.end(), parameters.begin(), parameters.end());
+
+ ServerInstance->PI->SendEncapsulatedData(params);
+
+ if (parameters[0][0] == '*')
+ {
+ this->Abort();
+ return false;
+ }
+
+ return true;
+ }
+
+ void AnnounceState(void)
+ {
+ if (this->state_announced)
+ return;
+
+ switch (this->result)
+ {
+ case SASL_OK:
+ this->user->WriteNumeric(903, "%s :SASL authentication successful", this->user->nick.c_str());
+ break;
+ case SASL_ABORT:
+ this->user->WriteNumeric(906, "%s :SASL authentication aborted", this->user->nick.c_str());
+ break;
+ case SASL_FAIL:
+ this->user->WriteNumeric(904, "%s :SASL authentication failed", this->user->nick.c_str());
+ break;
+ default:
+ break;
+ }
+
+ this->state_announced = true;
+ }
+
+ ~SaslAuthenticator()
+ {
+ this->user->Shrink("sasl_authenticator");
+ this->AnnounceState();
+ }
+};