src/modules/extra/m_ldapauth.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  *
  13  * Taken from the UnrealIRCd 4.0 SVN version, based on
  14  * InspIRCd 1.1.x.
  15  *
  16  * UnrealIRCd 4.0 (C) 2007 Carsten Valdemar Munk
  17  * This program is free but copyrighted software; see
  18  *          the file COPYING for details.
  19  *
  20  * ---------------------------------------------------
  21  * Heavily based on SQLauth
  22  */
  23
  24 #include "inspircd.h"
  25 #include "users.h"
  26 #include "channels.h"
  27 #include "modules.h"
  28
  29 #include <ldap.h>
  30
  31 /* $ModDesc: Allow/Deny connections based upon answer from LDAP server */
  32 /* $LinkerFlags: -lldap */
  33
  34 class ModuleLDAPAuth : public Module
  35 {
  36         std::string base;
  37         std::string attribute;
  38         std::string ldapserver;
  39         std::string allowpattern;
  40         std::string killreason;
  41         std::string username;
  42         std::string password;
  43         int searchscope;
  44         bool verbose;
  45         LDAP *conn;
  46
  47 public:
  48         ModuleLDAPAuth(InspIRCd* Me)
  49         : Module::Module(Me)
  50         {
  51                 conn = NULL;
  52                 Implementation eventlist[] = { I_OnUserDisconnect, I_OnCheckReady, I_OnRehash, I_OnUserRegister };
  53                 ServerInstance->Modules->Attach(eventlist, this, 4);
  54                 OnRehash(NULL,"");
  55         }
  56
  57         virtual ~ModuleLDAPAuth()
  58         {
  59                 if (conn)
  60                         ldap_unbind_ext(conn, NULL, NULL);
  61         }
  62
  63         virtual void OnRehash(User* user, const std::string &parameter)
  64         {
  65                 ConfigReader Conf(ServerInstance);
  66
  67                 base                    = Conf.ReadValue("ldapauth", "baserdn", 0);
  68                 attribute               = Conf.ReadValue("ldapauth", "attribute", 0);
  69                 ldapserver              = Conf.ReadValue("ldapauth", "server", 0);
  70                 allowpattern            = Conf.ReadValue("ldapauth", "allowpattern", 0);
  71                 killreason              = Conf.ReadValue("ldapauth", "killreason", 0);
  72                 std::string scope       = Conf.ReadValue("ldapauth", "searchscope", 0);
  73                 username                = Conf.ReadValue("ldapauth", "binddn", 0);
  74                 password                = Conf.ReadValue("ldapauth", "bindauth", 0);
  75                 verbose                 = Conf.ReadFlag("ldapauth", "verbose", 0);              /* Set to true if failed connects should be reported to operators */
  76
  77                 if (scope == "base")
  78                         searchscope = LDAP_SCOPE_BASE;
  79                 else if (scope == "onelevel")
  80                         searchscope = LDAP_SCOPE_ONELEVEL;
  81                 else searchscope = LDAP_SCOPE_SUBTREE;
  82
  83                 Connect();
  84         }
  85
  86         bool Connect()
  87         {
  88                 if (conn != NULL)
  89                         ldap_unbind_ext(conn, NULL, NULL);
  90                 int res, v = LDAP_VERSION3;
  91                 res = ldap_initialize(&conn, ldapserver.c_str());
  92                 if (res != LDAP_SUCCESS)
  93                 {
  94                         if (verbose)
  95                                 ServerInstance->SNO->WriteToSnoMask('A', "LDAP connection failed: %s", ldap_err2string(res));
  96                         conn = NULL;
  97                         return false;
  98                 }
  99
 100                 res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
 101                 if (res != LDAP_SUCCESS)
 102                 {
 103                         if (verbose)
 104                                 ServerInstance->SNO->WriteToSnoMask('A', "LDAP set protocol to v3 failed: %s", ldap_err2string(res));
 105                         ldap_unbind_ext(conn, NULL, NULL);
 106                         conn = NULL;
 107                         return false;
 108                 }
 109                 return true;
 110         }
 111
 112         virtual int OnUserRegister(User* user)
 113         {
 114                 if ((!allowpattern.empty()) && (ServerInstance->MatchText(user->nick,allowpattern)))
 115                 {
 116                         user->Extend("ldapauthed");
 117                         return 0;
 118                 }
 119
 120                 if (!CheckCredentials(user))
 121                 {
 122                         User::QuitUser(ServerInstance,user,killreason);
 123                         return 1;
 124                 }
 125                 return 0;
 126         }
 127
 128         bool CheckCredentials(User* user)
 129         {
 130                 if (conn == NULL)
 131                         if (!Connect())
 132                                 return false;
 133
 134                 int res;
 135                 char* authpass = strdup(password.c_str());
 136                 // bind anonymously if no bind DN and authentication are given in the config
 137                 struct berval cred;
 138                 cred.bv_val = authpass;
 139                 cred.bv_len = password.length();
 140
 141                 if ((res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS)
 142                 {
 143                         free(authpass);
 144                         if (verbose)
 145                                 ServerInstance->SNO->WriteToSnoMask('A', "Forbidden connection from %s!%s@%s (LDAP bind failed: %s)", user->nick, user->ident, user->host, ldap_err2string(res));
 146                         ldap_unbind_ext(conn, NULL, NULL);
 147                         conn = NULL;
 148                         return false;
 149                 }
 150                 free(authpass);
 151
 152                 LDAPMessage *msg, *entry;
 153                 std::string what = (attribute + "=" + user->nick);
 154                 if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
 155                 {
 156                         if (verbose)
 157                                 ServerInstance->SNO->WriteToSnoMask('A', "Forbidden connection from %s!%s@%s (LDAP search failed: %s)", user->nick, user->ident, user->host, ldap_err2string(res));
 158                         return false;
 159                 }
 160                 if (ldap_count_entries(conn, msg) > 1)
 161                 {
 162                         if (verbose)
 163                                 ServerInstance->SNO->WriteToSnoMask('A', "Forbidden connection from %s!%s@%s (LDAP search returned more than one result: %s)", user->nick, user->ident, user->host, ldap_err2string(res));
 164                         ldap_msgfree(msg);
 165                         return false;
 166                 }
 167                 if ((entry = ldap_first_entry(conn, msg)) == NULL)
 168                 {
 169                         if (verbose)
 170                                 ServerInstance->SNO->WriteToSnoMask('A', "Forbidden connection from %s!%s@%s (LDAP search returned no results: %s)", user->nick, user->ident, user->host, ldap_err2string(res));
 171                         ldap_msgfree(msg);
 172                         return false;
 173                 }
 174                 cred.bv_val = user->password;
 175                 cred.bv_len = strlen(user->password);
 176                 if ((res = ldap_sasl_bind_s(conn, ldap_get_dn(conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS)
 177                 {
 178                         ldap_msgfree(msg);
 179                         user->Extend("ldapauthed");
 180                         return true;
 181                 }
 182                 else
 183                 {
 184                         if (verbose)
 185                                 ServerInstance->SNO->WriteToSnoMask('A', "Forbidden connection from %s!%s@%s (%s)", user->nick, user->ident, user->host, ldap_err2string(res));
 186                         ldap_msgfree(msg);
 187                         user->Extend("ldapauth_failed");
 188                         return false;
 189                 }
 190         }
 191
 192
 193         virtual void OnUserDisconnect(User* user)
 194         {
 195                 user->Shrink("ldapauthed");
 196                 user->Shrink("ldapauth_failed");
 197         }
 198
 199         virtual bool OnCheckReady(User* user)
 200         {
 201                 return user->GetExt("ldapauthed");
 202         }
 203
 204         virtual Version GetVersion()
 205         {
 206                 return Version(1,2,0,0,VF_VENDOR,API_VERSION);
 207         }
 208
 209 };
 210
 211 MODULE_INIT(ModuleLDAPAuth)