src/modules/m_sasl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "m_cap.h"
  16 #include "account.h"
  17
  18 /* $ModDesc: Provides support for IRC Authentication Layer (aka: atheme SASL) via AUTHENTICATE. */
  19
  20 enum SaslState { SASL_INIT, SASL_COMM, SASL_DONE };
  21 enum SaslResult { SASL_OK, SASL_FAIL, SASL_ABORT };
  22
  23 /**
  24  * Tracks SASL authentication state like charybdis does. --nenolod
  25  */
  26 class SaslAuthenticator : public classbase
  27 {
  28  private:
  29         InspIRCd *ServerInstance;
  30         Module *Creator;
  31         std::string agent;
  32         User *user;
  33         SaslState state;
  34         SaslResult result;
  35         bool state_announced;
  36
  37  public:
  38         SaslAuthenticator(User *user_, std::string method, InspIRCd *instance, Module *ctor)
  39                 : ServerInstance(instance), Creator(ctor), user(user_), state(SASL_INIT), state_announced(false)
  40         {
  41                 this->user->Extend("sasl_authenticator", this);
  42
  43                 std::deque<std::string> params;
  44                 params.push_back("*");
  45                 params.push_back("SASL");
  46                 params.push_back(user->uuid);
  47                 params.push_back("*");
  48                 params.push_back("S");
  49                 params.push_back(method);
  50
  51                 ServerInstance->PI->SendEncapsulatedData(params);
  52         }
  53
  54         SaslResult GetSaslResult(std::string &result_)
  55         {
  56                 if (result_ == "F")
  57                         return SASL_FAIL;
  58
  59                 if (result_ == "A")
  60                         return SASL_ABORT;
  61
  62                 return SASL_OK;
  63         }
  64
  65         /* checks for and deals with a state change. */
  66         SaslState ProcessInboundMessage(std::deque<std::string> &msg)
  67         {
  68                 switch (this->state)
  69                 {
  70                  case SASL_INIT:
  71                         this->agent = msg[2];
  72                         this->user->Write("AUTHENTICATE %s", msg[5].c_str());
  73                         this->state = SASL_COMM;
  74                         break;
  75                  case SASL_COMM:
  76                         if (msg[2] != this->agent)
  77                                 return this->state;
  78
  79                         if (msg[4] != "D")
  80                                 this->user->Write("AUTHENTICATE %s", msg[5].c_str());
  81                         else
  82                         {
  83                                 this->state = SASL_DONE;
  84                                 this->result = this->GetSaslResult(msg[5]);
  85                         }
  86
  87                         break;
  88                  case SASL_DONE:
  89                         break;
  90                  default:
  91                         ServerInstance->Logs->Log("m_sasl", DEFAULT, "WTF: SaslState is not a known state (%d)", this->state);
  92                         break;
  93                 }
  94
  95                 return this->state;
  96         }
  97
  98         void Abort(void)
  99         {
 100                 this->state = SASL_DONE;
 101                 this->result = SASL_ABORT;
 102         }
 103
 104         bool SendClientMessage(const std::vector<std::string>& parameters)
 105         {
 106                 if (this->state != SASL_COMM)
 107                         return true;
 108
 109                 std::deque<std::string> params;
 110                 params.push_back("*");
 111                 params.push_back("SASL");
 112                 params.push_back(this->user->uuid);
 113                 params.push_back(this->agent);
 114                 params.push_back("C");
 115
 116                 params.insert(params.end(), parameters.begin(), parameters.end());
 117
 118                 ServerInstance->PI->SendEncapsulatedData(params);
 119
 120                 if (parameters[0][0] == '*')
 121                 {
 122                         this->Abort();
 123                         return false;
 124                 }
 125
 126                 return true;
 127         }
 128
 129         void AnnounceState(void)
 130         {
 131                 if (this->state_announced)
 132                         return;
 133
 134                 switch (this->result)
 135                 {
 136                  case SASL_OK:
 137                         this->user->WriteNumeric(903, "%s :SASL authentication successful", this->user->nick.c_str());
 138                         break;
 139                  case SASL_ABORT:
 140                         this->user->WriteNumeric(906, "%s :SASL authentication aborted", this->user->nick.c_str());
 141                         break;
 142                  case SASL_FAIL:
 143                         this->user->WriteNumeric(904, "%s :SASL authentication failed", this->user->nick.c_str());
 144                         break;
 145                  default:
 146                         break;
 147                 }
 148
 149                 this->state_announced = true;
 150         }
 151
 152         ~SaslAuthenticator()
 153         {
 154                 this->user->Shrink("sasl_authenticator");
 155                 this->AnnounceState();
 156         }
 157 };
 158
 159 class CommandAuthenticate : public Command
 160 {
 161         Module* Creator;
 162  public:
 163         CommandAuthenticate (InspIRCd* Instance, Module* creator) : Command(Instance,"AUTHENTICATE", 0, 1, true), Creator(creator)
 164         {
 165                 this->source = "m_sasl.so";
 166         }
 167
 168         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
 169         {
 170                 /* Only allow AUTHENTICATE on unregistered clients */
 171                 if (user->registered != REG_ALL)
 172                 {
 173                         if (!user->GetExt("sasl"))
 174                                 return CMD_FAILURE;
 175
 176                         SaslAuthenticator *sasl;
 177                         if (!(user->GetExt("sasl_authenticator", sasl)))
 178                                 sasl = new SaslAuthenticator(user, parameters[0], ServerInstance, Creator);
 179                         else if (sasl->SendClientMessage(parameters) == false)  // IAL abort extension --nenolod
 180                                 delete sasl;
 181                 }
 182                 return CMD_FAILURE;
 183         }
 184 };
 185
 186
 187 class ModuleSASL : public Module
 188 {
 189         CommandAuthenticate sasl;
 190  public:
 191
 192         ModuleSASL(InspIRCd* Me)
 193                 : Module(Me), sasl(Me, this)
 194         {
 195                 Implementation eventlist[] = { I_OnEvent, I_OnUserRegister, I_OnPostConnect, I_OnUserDisconnect, I_OnCleanup };
 196                 ServerInstance->Modules->Attach(eventlist, this, 5);
 197
 198                 ServerInstance->AddCommand(&sasl);
 199
 200                 if (!ServerInstance->Modules->Find("m_services_account.so") || !ServerInstance->Modules->Find("m_cap.so"))
 201                         ServerInstance->Logs->Log("m_sasl", DEFAULT, "WARNING: m_services_account.so and m_cap.so are not loaded! m_sasl.so will NOT function correctly until these two modules are loaded!");
 202         }
 203
 204         virtual int OnUserRegister(User *user)
 205         {
 206                 SaslAuthenticator *sasl_;
 207                 if (user->GetExt("sasl_authenticator", sasl_))
 208                 {
 209                         sasl_->Abort();
 210                         delete sasl_;
 211                         user->Shrink("sasl_authenticator");
 212                 }
 213
 214                 return 0;
 215         }
 216
 217         virtual void OnCleanup(int target_type, void *item)
 218         {
 219                 if (target_type == TYPE_USER)
 220                         OnUserDisconnect((User*)item);
 221         }
 222
 223         virtual void OnUserDisconnect(User *user)
 224         {
 225                 SaslAuthenticator *sasl_;
 226                 if (user->GetExt("sasl_authenticator", sasl_))
 227                 {
 228                         delete sasl_;
 229                         user->Shrink("sasl_authenticator");
 230                 }
 231         }
 232
 233         virtual void OnPostConnect(User* user)
 234         {
 235                 if (!IS_LOCAL(user))
 236                         return;
 237
 238                 std::string* str = NULL;
 239
 240                 if (user->GetExt("accountname", str))
 241                         ServerInstance->PI->SendMetaData(user, TYPE_USER, "accountname", *str);
 242
 243                 return;
 244         }
 245
 246         virtual ~ModuleSASL()
 247         {
 248         }
 249
 250         virtual Version GetVersion()
 251         {
 252                 return Version("$Id$",VF_VENDOR,API_VERSION);
 253         }
 254
 255         virtual void OnEvent(Event *ev)
 256         {
 257                 GenericCapHandler(ev, "sasl", "sasl");
 258
 259                 if (ev->GetEventID() == "encap_received")
 260                 {
 261                         std::deque<std::string>* parameters = (std::deque<std::string>*)ev->GetData();
 262
 263                         if ((*parameters)[1] != "SASL")
 264                                 return;
 265
 266                         User* target = ServerInstance->FindNick((*parameters)[3]);
 267                         if (!target)
 268                         {
 269                                 ServerInstance->Logs->Log("m_sasl", DEBUG,"User not found in sasl ENCAP event: %s", (*parameters)[3].c_str());
 270                                 return;
 271                         }
 272
 273                         SaslAuthenticator *sasl_;
 274                         if (!target->GetExt("sasl_authenticator", sasl_))
 275                                 return;
 276
 277                         SaslState state = sasl_->ProcessInboundMessage(*parameters);
 278                         if (state == SASL_DONE)
 279                         {
 280                                 delete sasl_;
 281                                 target->Shrink("sasl");
 282                         }
 283                 }
 284         }
 285 };
 286
 287 MODULE_INIT(ModuleSASL)