src/modules/extra/m_ldapoper.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  * 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 ldapserver;
  38         std::string username;
  39         std::string password;
  40         int searchscope;
  41         LDAP *conn;
  42
  43 public:
  44         ModuleLDAPAuth()
  45                 {
  46                 conn = NULL;
  47                 Implementation eventlist[] = { I_OnRehash, I_OnPassCompare };
  48                 ServerInstance->Modules->Attach(eventlist, this, 2);
  49                 OnRehash(NULL);
  50         }
  51
  52         virtual ~ModuleLDAPAuth()
  53         {
  54                 if (conn)
  55                         ldap_unbind_ext(conn, NULL, NULL);
  56         }
  57
  58         virtual void OnRehash(User* user)
  59         {
  60                 ConfigReader Conf;
  61
  62                 base                    = Conf.ReadValue("ldapoper", "baserdn", 0);
  63                 ldapserver              = Conf.ReadValue("ldapoper", "server", 0);
  64                 std::string scope       = Conf.ReadValue("ldapoper", "searchscope", 0);
  65                 username                = Conf.ReadValue("ldapoper", "binddn", 0);
  66                 password                = Conf.ReadValue("ldapoper", "bindauth", 0);
  67
  68                 if (scope == "base")
  69                         searchscope = LDAP_SCOPE_BASE;
  70                 else if (scope == "onelevel")
  71                         searchscope = LDAP_SCOPE_ONELEVEL;
  72                 else searchscope = LDAP_SCOPE_SUBTREE;
  73
  74                 Connect();
  75         }
  76
  77         bool Connect()
  78         {
  79                 if (conn != NULL)
  80                         ldap_unbind_ext(conn, NULL, NULL);
  81                 int res, v = LDAP_VERSION3;
  82                 res = ldap_initialize(&conn, ldapserver.c_str());
  83                 if (res != LDAP_SUCCESS)
  84                 {
  85                         conn = NULL;
  86                         return false;
  87                 }
  88
  89                 res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
  90                 if (res != LDAP_SUCCESS)
  91                 {
  92                         ldap_unbind_ext(conn, NULL, NULL);
  93                         conn = NULL;
  94                         return false;
  95                 }
  96                 return true;
  97         }
  98
  99         virtual ModResult OnPassCompare(Extensible* ex, const std::string &data, const std::string &input, const std::string &hashtype)
 100         {
 101                 User* user = dynamic_cast<User*>(ex);
 102                 if (hashtype == "ldap")
 103                 {
 104                         if (LookupOper(user, data, input))
 105                         {
 106                                 /* This is an ldap oper and has been found, claim the OPER command */
 107                                 return MOD_RES_DENY;
 108                         }
 109                 }
 110                 /* We don't know this oper! */
 111                 return MOD_RES_PASSTHRU;
 112         }
 113
 114         bool LookupOper(User* user, const std::string &what, const std::string &opassword)
 115         {
 116                 if (conn == NULL)
 117                         if (!Connect())
 118                                 return false;
 119
 120                 int res;
 121                 char* authpass = strdup(password.c_str());
 122                 // bind anonymously if no bind DN and authentication are given in the config
 123                 struct berval cred;
 124                 cred.bv_val = authpass;
 125                 cred.bv_len = password.length();
 126
 127                 if ((res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS)
 128                 {
 129                         if (res == LDAP_SERVER_DOWN)
 130                         {
 131                                 // Attempt to reconnect if the connection dropped
 132                                 ServerInstance->SNO->WriteToSnoMask('a', "LDAP server has gone away - reconnecting...");
 133                                 Connect();
 134                                 res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
 135                         }
 136
 137                         if (res != LDAP_SUCCESS)
 138                         {
 139                                 free(authpass);
 140                                 ldap_unbind_ext(conn, NULL, NULL);
 141                                 conn = NULL;
 142                                 return false;
 143                         }
 144                 }
 145                 free(authpass);
 146
 147                 LDAPMessage *msg, *entry;
 148                 if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
 149                 {
 150                         return false;
 151                 }
 152                 if (ldap_count_entries(conn, msg) > 1)
 153                 {
 154                         ldap_msgfree(msg);
 155                         return false;
 156                 }
 157                 if ((entry = ldap_first_entry(conn, msg)) == NULL)
 158                 {
 159                         ldap_msgfree(msg);
 160                         return false;
 161                 }
 162                 authpass = strdup(opassword.c_str());
 163                 cred.bv_val = authpass;
 164                 cred.bv_len = opassword.length();
 165                 if ((res = ldap_sasl_bind_s(conn, ldap_get_dn(conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS)
 166                 {
 167                         free(authpass);
 168                         ldap_msgfree(msg);
 169                         return true;
 170                 }
 171                 else
 172                 {
 173                         free(authpass);
 174                         ldap_msgfree(msg);
 175                         return false;
 176                 }
 177         }
 178
 179         virtual Version GetVersion()
 180         {
 181                 return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR, API_VERSION);
 182         }
 183
 184 };
 185
 186 MODULE_INIT(ModuleLDAPAuth)