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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
{
LocalIntExt ldapAuthed;
std::string base;
std::string attribute;
std::string ldapserver;
std::string allowpattern;
std::string killreason;
std::string username;
std::string password;
int searchscope;
bool verbose;
bool useusername;
LDAP *conn;
public:
ModuleLDAPAuth() : ldapAuthed("ldapauth", this)
{
conn = NULL;
Implementation eventlist[] = { I_OnCheckReady, I_OnRehash, I_OnUserRegister };
ServerInstance->Modules->Attach(eventlist, this, 4);
OnRehash(NULL);
}
~ModuleLDAPAuth()
{
if (conn)
ldap_unbind_ext(conn, NULL, NULL);
}
void OnRehash(User* user)
{
ConfigReader Conf;
base = Conf.ReadValue("ldapauth", "baserdn", 0);
attribute = Conf.ReadValue("ldapauth", "attribute", 0);
ldapserver = Conf.ReadValue("ldapauth", "server", 0);
allowpattern = Conf.ReadValue("ldapauth", "allowpattern", 0);
killreason = Conf.ReadValue("ldapauth", "killreason", 0);
std::string scope = Conf.ReadValue("ldapauth", "searchscope", 0);
username = Conf.ReadValue("ldapauth", "binddn", 0);
password = Conf.ReadValue("ldapauth", "bindauth", 0);
verbose = Conf.ReadFlag("ldapauth", "verbose", 0); /* Set to true if failed connects should be reported to operators */
useusername = Conf.ReadFlag("ldapauth", "userfield", 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)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "LDAP connection failed: %s", ldap_err2string(res));
conn = NULL;
return false;
}
res = ldap_set_option(conn, LDAP_OPT_PROTOCOL_VERSION, (void *)&v);
if (res != LDAP_SUCCESS)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "LDAP set protocol to v3 failed: %s", ldap_err2string(res));
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
return true;
}
ModResult OnUserRegister(User* user)
{
if ((!allowpattern.empty()) && (InspIRCd::Match(user->nick,allowpattern)))
{
ldapAuthed.set(user,1);
return MOD_RES_PASSTHRU;
}
if (!CheckCredentials(user))
{
ServerInstance->Users->QuitUser(user, killreason);
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
bool CheckCredentials(User* user)
{
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
if (verbose)
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)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP bind failed: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
free(authpass);
ldap_unbind_ext(conn, NULL, NULL);
conn = NULL;
return false;
}
}
free(authpass);
LDAPMessage *msg, *entry;
std::string what = (attribute + "=" + (useusername ? user->ident : user->nick));
if ((res = ldap_search_ext_s(conn, base.c_str(), searchscope, what.c_str(), NULL, 0, NULL, NULL, NULL, 0, &msg)) != LDAP_SUCCESS)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search failed: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
return false;
}
if (ldap_count_entries(conn, msg) > 1)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search returned more than one result: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_msgfree(msg);
return false;
}
if ((entry = ldap_first_entry(conn, msg)) == NULL)
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (LDAP search returned no results: %s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_msgfree(msg);
return false;
}
if (user->password.empty())
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (No password provided)", user->nick.c_str(), user->ident.c_str(), user->host.c_str());
return false;
}
cred.bv_val = (char*)user->password.data();
cred.bv_len = user->password.length();
if ((res = ldap_sasl_bind_s(conn, ldap_get_dn(conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL)) == LDAP_SUCCESS)
{
ldap_msgfree(msg);
ldapAuthed.set(user,1);
return true;
}
else
{
if (verbose)
ServerInstance->SNO->WriteToSnoMask('c', "Forbidden connection from %s!%s@%s (%s)", user->nick.c_str(), user->ident.c_str(), user->host.c_str(), ldap_err2string(res));
ldap_msgfree(msg);
return false;
}
}
ModResult OnCheckReady(User* user)
{
return ldapAuthed.get(user) ? MOD_RES_PASSTHRU : MOD_RES_DENY;
}
Version GetVersion()
{
return Version("Allow/Deny connections based upon answer from LDAP server", VF_VENDOR, API_VERSION);
}
};
MODULE_INIT(ModuleLDAPAuth)
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