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|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2009 InspIRCd Development Team
* See: http://wiki.inspircd.org/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*
* Taken from the UnrealIRCd 4.0 SVN version, based on
* InspIRCd 1.1.x.
*
* UnrealIRCd 4.0 (C) 2007 Carsten Valdemar Munk
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
* Heavily based on SQLauth
*/
#include "inspircd.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include <ldap.h>
/* $ModDesc: Allow/Deny connections based upon answer from LDAP server */
/* $LinkerFlags: -lldap */
class ModuleLDAPAuth : public Module
{
std::string base;
std::string ldapserver;
std::string username;
std::string password;
int searchscope;
LDAP *conn;
public:
ModuleLDAPAuth(InspIRCd* Me)
: Module(Me)
{
conn = NULL;
Implementation eventlist[] = { I_OnRehash, I_OnPassCompare };
ServerInstance->Modules->Attach(eventlist, this, 2);
OnRehash(NULL);
}
virtual ~ModuleLDAPAuth()
{
if (conn)
ldap_unbind_ext(conn, NULL, NULL);
}
virtual void OnRehash(User* user)
{
ConfigReader Conf(ServerInstance);
base = Conf.ReadValue("ldapoper", "baserdn", 0);
ldapserver = Conf.ReadValue("ldapoper", "server", 0);
std::string scope = Conf.ReadValue("ldapoper", "searchscope", 0);
username = Conf.ReadValue("ldapoper", "binddn", 0);
password = Conf.ReadValue("ldapoper", "bindauth", 0);
if (scope == "base")
searchscope = LDAP_SCOPE_BASE;
else if (scope == "onelevel")
searchscope = LDAP_SCOPE_ONELEVEL;
else searchscope = LDAP_SCOPE_SUBTREE;
Connect();
}
bool Connect()
{
if (conn != NULL)
ldap_unbind_ext(conn, NULL, NULL);
int res, v = LDAP_VERSION3;
res = ldap_initialize(&conn, ldapserver.c_str());
if (res != LDAP_SUCCESS)
{
conn = NULL;
return false;
}
res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
if (res != LDAP_SUCCESS)
{
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
return true;
}
virtual ModResult OnPassCompare(Extensible* ex, const std::string &data, const std::string &input, const std::string &hashtype)
{
User* user = dynamic_cast<User*>(ex);
if (hashtype == "ldap")
{
if (LookupOper(user, data, input))
{
/* This is an ldap oper and has been found, claim the OPER command */
return MOD_RES_DENY;
}
}
/* We don't know this oper! */
return MOD_RES_PASSTHRU;
}
bool LookupOper(User* user, const std::string &what, const std::string &opassword)
{
if (conn == NULL)
if (!Connect())
return false;
int res;
char* authpass = strdup(password.c_str());
// bind anonymously if no bind DN and authentication are given in the config
struct berval cred;
cred.bv_val = authpass;
cred.bv_len = password.length();
if ((res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) != LDAP_SUCCESS)
{
if (res == LDAP_SERVER_DOWN)
{
// Attempt to reconnect if the connection dropped
ServerInstance->SNO->WriteToSnoMask('a', "LDAP server has gone away - reconnecting...");
Connect();
res = ldap_sasl_bind_s(conn, username.c_str(), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
}
if (res != LDAP_SUCCESS)
{
free(authpass);
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
}
free(authpass);
LDAPMessage *msg, *entry;
if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
{
return false;
}
if (ldap_count_entries(conn, msg) > 1)
{
ldap_msgfree(msg);
return false;
}
if ((entry = ldap_first_entry(conn, msg)) == NULL)
{
ldap_msgfree(msg);
return false;
}
authpass = strdup(opassword.c_str());
cred.bv_val = authpass;
cred.bv_len = opassword.length();
if ((res = ldap_sasl_bind_s(conn, ldap_get_dn(conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS)
{
free(authpass);
ldap_msgfree(msg);
return true;
}
else
{
free(authpass);
ldap_msgfree(msg);
return false;
}
}
virtual Version GetVersion()
{
return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR, API_VERSION);
}
};
MODULE_INIT(ModuleLDAPAuth)
|
