src/modules/extra/m_sqlauth.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include <stdio.h>
  20 #include <string>
  21 #include <stdlib.h>
  22 #include <time.h>
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <sys/time.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <poll.h>
  31 #include "users.h"
  32 #include "channels.h"
  33 #include "modules.h"
  34 #include "inspircd.h"
  35 #include "helperfuncs.h"
  36 #include "m_sql.h"
  37
  38 /* $ModDesc: Allow/Deny connections based upon an arbitary SQL table */
  39
  40 Server *Srv;
  41
  42 class ModuleSQLAuth : public Module
  43 {
  44         ConfigReader* Conf;
  45         std::string usertable;
  46         std::string userfield;
  47         std::string passfield;
  48         std::string encryption;
  49         std::string killreason;
  50         std::string allowpattern;
  51         bool WallOperFail;
  52         unsigned long dbid;
  53         Module* SQLModule;
  54
  55  public:
  56         bool ReadConfig()
  57         {
  58                 Conf = new ConfigReader();
  59                 usertable = Conf->ReadValue("sqlauth","usertable",0);   // user table name
  60                 dbid = Conf->ReadInteger("sqlauth","dbid",0,true);      // database id of a database configured in m_sql (see m_sql config)
  61                 userfield = Conf->ReadValue("sqlauth","userfield",0);   // field name where username can be found
  62                 passfield = Conf->ReadValue("sqlauth","passfield",0);   // field name where password can be found
  63                 killreason = Conf->ReadValue("sqlauth","killreason",0); // reason to give when access is denied to a user (put your reg details here)
  64                 encryption = Conf->ReadValue("sqlauth","encryption",0); // name of sql function used to encrypt password, e.g. "md5" or "passwd".
  65                                                                         // define, but leave blank if no encryption is to be used.
  66                 WallOperFail = Conf->ReadFlag("sqlauth","verbose",0);   // set to 1 if failed connects should be reported to operators
  67                 allowpattern = Conf->ReadValue("sqlauth","allowpattern",0);     // allow nicks matching the pattern without requiring auth
  68                 delete Conf;
  69                 SQLModule = Srv->FindModule("m_sql.so");
  70                 if (!SQLModule)
  71                         Srv->Log(DEFAULT,"WARNING: m_sqlauth.so could not initialize because m_sql.so is not loaded. Load the module and rehash your server.");
  72                 return (SQLModule);
  73         }
  74
  75         ModuleSQLAuth(Server* Me)
  76                 : Module::Module(Me)
  77         {
  78                 Srv = Me;
  79                 ReadConfig();
  80         }
  81
  82         virtual void OnRehash(std::string parameter)
  83         {
  84                 ReadConfig();
  85         }
  86
  87         virtual void OnUserRegister(userrec* user)
  88         {
  89                 if ((allowpattern != "") && (Srv->MatchText(user->nick,allowpattern)))
  90                         return;
  91
  92                 if (!CheckCredentials(user->nick,user->password))
  93                 {
  94                         if (WallOperFail)
  95                                 WriteOpers("Forbidden connection from %s!%s@%s (invalid login/password)",user->nick,user->ident,user->host);
  96                         Srv->QuitUser(user,killreason);
  97                 }
  98         }
  99
 100         bool CheckCredentials(std::string username, std::string password)
 101         {
 102                 bool found = false;
 103
 104                 // is the sql module loaded? If not, we don't attempt to do anything.
 105                 if (!SQLModule)
 106                         return false;
 107
 108                 // sanitize the password (we dont want any mysql insertion exploits!)
 109                 std::string temp = "";
 110                 for (unsigned int q = 0; q < password.length(); q++)
 111                 {
 112                         if (password[q] == '\'')
 113                         {
 114                                 temp = temp + "\'";
 115                         }
 116                         else if (password[q] == '"')
 117                         {
 118                                 temp = temp + "\\\"";
 119                         }
 120                         else temp = temp + password[q];
 121                 }
 122                 password = temp;
 123
 124                 // Create a request containing the SQL query and send it to m_sql.so
 125                 SQLRequest* query = new SQLRequest(SQL_RESULT,dbid,"SELECT * FROM "+usertable+" WHERE "+userfield+"='"+username+"' AND "+passfield+"="+encryption+"('"+password+"')");
 126                 Request queryrequest((char*)query, this, SQLModule);
 127                 SQLResult* result = (SQLResult*)queryrequest.Send();
 128
 129                 // Did we get "OK" as a result?
 130                 if (result->GetType() == SQL_OK)
 131                 {
 132
 133                         // if we did, this means we may now request a row... there should be only one row for each user, so,
 134                         // we don't need to loop to fetch multiple rows.
 135                         SQLRequest* rowrequest = new SQLRequest(SQL_ROW,dbid,"");
 136                         Request rowquery((char*)rowrequest, this, SQLModule);
 137                         SQLResult* rowresult = (SQLResult*)rowquery.Send();
 138
 139                         // did we get a row? If we did, we can now do something with the fields
 140                         if (rowresult->GetType() == SQL_ROW)
 141                         {
 142                                 if (rowresult->GetField(userfield) == username)
 143                                 {
 144                                         // because the query directly asked for the password hash, we do not need to check it -
 145                                         // if it didnt match it wont be returned in the first place from the SELECT.
 146                                         // This just checks we didnt get an empty row by accident.
 147                                         found = true;
 148                                 }
 149                                 delete rowresult;
 150                         }
 151                         else
 152                         {
 153                                 // we didn't have a row.
 154                                 found = false;
 155                         }
 156                         delete rowrequest;
 157                         delete result;
 158                 }
 159                 else
 160                 {
 161                         // the query was bad
 162                         found = false;
 163                 }
 164                 query->SetQueryType(SQL_DONE);
 165                 query->SetConnID(dbid);
 166                 Request donerequest((char*)query, this, SQLModule);
 167                 donerequest.Send();
 168                 delete query;
 169                 return found;
 170         }
 171
 172         virtual ~ModuleSQLAuth()
 173         {
 174         }
 175
 176         virtual Version GetVersion()
 177         {
 178                 return Version(1,0,0,1,VF_VENDOR);
 179         }
 180
 181 };
 182
 183 class ModuleSQLAuthFactory : public ModuleFactory
 184 {
 185  public:
 186         ModuleSQLAuthFactory()
 187         {
 188         }
 189
 190         ~ModuleSQLAuthFactory()
 191         {
 192         }
 193
 194         virtual Module * CreateModule(Server* Me)
 195         {
 196                 return new ModuleSQLAuth(Me);
 197         }
 198
 199 };
 200
 201
 202 extern "C" void * init_module( void )
 203 {
 204         return new ModuleSQLAuthFactory;
 205 }
 206