src/modules/m_sasl.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
   6  *
   7  * This file is part of InspIRCd.  InspIRCd is free software: you can
   8  * redistribute it and/or modify it under the terms of the GNU General Public
   9  * License as published by the Free Software Foundation, version 2.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14  * details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include "inspircd.h"
  22 #include "modules/cap.h"
  23 #include "modules/account.h"
  24 #include "modules/sasl.h"
  25 #include "modules/ssl.h"
  26
  27 enum SaslState { SASL_INIT, SASL_COMM, SASL_DONE };
  28 enum SaslResult { SASL_OK, SASL_FAIL, SASL_ABORT };
  29
  30 static std::string sasl_target = "*";
  31
  32 static void SendSASL(const parameterlist& params)
  33 {
  34         if (!ServerInstance->PI->SendEncapsulatedData(params))
  35         {
  36                 SASLFallback(NULL, params);
  37         }
  38 }
  39
  40 /**
  41  * Tracks SASL authentication state like charybdis does. --nenolod
  42  */
  43 class SaslAuthenticator
  44 {
  45  private:
  46         std::string agent;
  47         User *user;
  48         SaslState state;
  49         SaslResult result;
  50         bool state_announced;
  51
  52  public:
  53         SaslAuthenticator(User* user_, const std::string& method)
  54                 : user(user_), state(SASL_INIT), state_announced(false)
  55         {
  56                 parameterlist params;
  57                 params.push_back(sasl_target);
  58                 params.push_back("SASL");
  59                 params.push_back(user->uuid);
  60                 params.push_back("*");
  61                 params.push_back("S");
  62                 params.push_back(method);
  63
  64                 LocalUser* localuser = IS_LOCAL(user);
  65                 if (method == "EXTERNAL" && localuser)
  66                 {
  67                         std::string fp = SSLClientCert::GetFingerprint(&localuser->eh);
  68
  69                         if (fp.size())
  70                                 params.push_back(fp);
  71                 }
  72
  73                 SendSASL(params);
  74         }
  75
  76         SaslResult GetSaslResult(const std::string &result_)
  77         {
  78                 if (result_ == "F")
  79                         return SASL_FAIL;
  80
  81                 if (result_ == "A")
  82                         return SASL_ABORT;
  83
  84                 return SASL_OK;
  85         }
  86
  87         /* checks for and deals with a state change. */
  88         SaslState ProcessInboundMessage(const std::vector<std::string> &msg)
  89         {
  90                 switch (this->state)
  91                 {
  92                  case SASL_INIT:
  93                         this->agent = msg[0];
  94                         this->state = SASL_COMM;
  95                         /* fall through */
  96                  case SASL_COMM:
  97                         if (msg[0] != this->agent)
  98                                 return this->state;
  99
 100                         if (msg[2] == "C")
 101                                 this->user->Write("AUTHENTICATE %s", msg[3].c_str());
 102                         else if (msg[2] == "D")
 103                         {
 104                                 this->state = SASL_DONE;
 105                                 this->result = this->GetSaslResult(msg[3]);
 106                         }
 107                         else if (msg[2] == "M")
 108                                 this->user->WriteNumeric(908, "%s %s :are available SASL mechanisms", this->user->nick.c_str(), msg[3].c_str());
 109                         else
 110                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Services sent an unknown SASL message \"%s\" \"%s\"", msg[2].c_str(), msg[3].c_str());
 111
 112                         break;
 113                  case SASL_DONE:
 114                         break;
 115                  default:
 116                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "WTF: SaslState is not a known state (%d)", this->state);
 117                         break;
 118                 }
 119
 120                 return this->state;
 121         }
 122
 123         void Abort(void)
 124         {
 125                 this->state = SASL_DONE;
 126                 this->result = SASL_ABORT;
 127         }
 128
 129         bool SendClientMessage(const std::vector<std::string>& parameters)
 130         {
 131                 if (this->state != SASL_COMM)
 132                         return true;
 133
 134                 parameterlist params;
 135                 params.push_back(sasl_target);
 136                 params.push_back("SASL");
 137                 params.push_back(this->user->uuid);
 138                 params.push_back(this->agent);
 139                 params.push_back("C");
 140
 141                 params.insert(params.end(), parameters.begin(), parameters.end());
 142
 143                 SendSASL(params);
 144
 145                 if (parameters[0][0] == '*')
 146                 {
 147                         this->Abort();
 148                         return false;
 149                 }
 150
 151                 return true;
 152         }
 153
 154         void AnnounceState(void)
 155         {
 156                 if (this->state_announced)
 157                         return;
 158
 159                 switch (this->result)
 160                 {
 161                  case SASL_OK:
 162                         this->user->WriteNumeric(903, ":SASL authentication successful");
 163                         break;
 164                  case SASL_ABORT:
 165                         this->user->WriteNumeric(906, ":SASL authentication aborted");
 166                         break;
 167                  case SASL_FAIL:
 168                         this->user->WriteNumeric(904, ":SASL authentication failed");
 169                         break;
 170                  default:
 171                         break;
 172                 }
 173
 174                 this->state_announced = true;
 175         }
 176 };
 177
 178 class CommandAuthenticate : public Command
 179 {
 180  public:
 181         SimpleExtItem<SaslAuthenticator>& authExt;
 182         GenericCap& cap;
 183         CommandAuthenticate(Module* Creator, SimpleExtItem<SaslAuthenticator>& ext, GenericCap& Cap)
 184                 : Command(Creator, "AUTHENTICATE", 1), authExt(ext), cap(Cap)
 185         {
 186                 works_before_reg = true;
 187         }
 188
 189         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
 190         {
 191                 /* Only allow AUTHENTICATE on unregistered clients */
 192                 if (user->registered != REG_ALL)
 193                 {
 194                         if (!cap.ext.get(user))
 195                                 return CMD_FAILURE;
 196
 197                         SaslAuthenticator *sasl = authExt.get(user);
 198                         if (!sasl)
 199                                 authExt.set(user, new SaslAuthenticator(user, parameters[0]));
 200                         else if (sasl->SendClientMessage(parameters) == false)  // IAL abort extension --nenolod
 201                         {
 202                                 sasl->AnnounceState();
 203                                 authExt.unset(user);
 204                         }
 205                 }
 206                 return CMD_FAILURE;
 207         }
 208 };
 209
 210 class CommandSASL : public Command
 211 {
 212  public:
 213         SimpleExtItem<SaslAuthenticator>& authExt;
 214         CommandSASL(Module* Creator, SimpleExtItem<SaslAuthenticator>& ext) : Command(Creator, "SASL", 2), authExt(ext)
 215         {
 216                 this->flags_needed = FLAG_SERVERONLY; // should not be called by users
 217         }
 218
 219         CmdResult Handle(const std::vector<std::string>& parameters, User *user)
 220         {
 221                 User* target = ServerInstance->FindNick(parameters[1]);
 222                 if ((!target) || (IS_SERVER(target)))
 223                 {
 224                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "User not found in sasl ENCAP event: %s", parameters[1].c_str());
 225                         return CMD_FAILURE;
 226                 }
 227
 228                 SaslAuthenticator *sasl = authExt.get(target);
 229                 if (!sasl)
 230                         return CMD_FAILURE;
 231
 232                 SaslState state = sasl->ProcessInboundMessage(parameters);
 233                 if (state == SASL_DONE)
 234                 {
 235                         sasl->AnnounceState();
 236                         authExt.unset(target);
 237                 }
 238                 return CMD_SUCCESS;
 239         }
 240
 241         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 242         {
 243                 return ROUTE_BROADCAST;
 244         }
 245 };
 246
 247 class ModuleSASL : public Module
 248 {
 249         SimpleExtItem<SaslAuthenticator> authExt;
 250         GenericCap cap;
 251         CommandAuthenticate auth;
 252         CommandSASL sasl;
 253
 254  public:
 255         ModuleSASL()
 256                 : authExt("sasl_auth", this), cap(this, "sasl"), auth(this, authExt, cap), sasl(this, authExt)
 257         {
 258         }
 259
 260         void init() CXX11_OVERRIDE
 261         {
 262                 if (!ServerInstance->Modules->Find("m_services_account.so") || !ServerInstance->Modules->Find("m_cap.so"))
 263                         ServerInstance->Logs->Log(MODNAME, LOG_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!");
 264         }
 265
 266         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 267         {
 268                 sasl_target = ServerInstance->Config->ConfValue("sasl")->getString("target", "*");
 269         }
 270
 271         ModResult OnUserRegister(LocalUser *user) CXX11_OVERRIDE
 272         {
 273                 SaslAuthenticator *sasl_ = authExt.get(user);
 274                 if (sasl_)
 275                 {
 276                         sasl_->Abort();
 277                         authExt.unset(user);
 278                 }
 279
 280                 return MOD_RES_PASSTHRU;
 281         }
 282
 283         Version GetVersion() CXX11_OVERRIDE
 284         {
 285                 return Version("Provides support for IRC Authentication Layer (aka: atheme SASL) via AUTHENTICATE.",VF_VENDOR);
 286         }
 287
 288         void OnEvent(Event &ev) CXX11_OVERRIDE
 289         {
 290                 cap.HandleEvent(ev);
 291         }
 292 };
 293
 294 MODULE_INIT(ModuleSASL)