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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
* Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
* Copyright (C) 2007 Carsten Valdemar Munk <carsten.munk+inspircd@gmail.com>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include <ldap.h>
#ifdef _WIN32
# pragma comment(lib, "ldap.lib")
# pragma comment(lib, "lber.lib")
#endif
/* $ModDesc: Adds the ability to authenticate opers via LDAP */
/* $LinkerFlags: -lldap */
// Duplicated code, also found in cmd_oper and m_sqloper
static bool OneOfMatches(const char* host, const char* ip, const std::string& hostlist)
{
std::stringstream hl(hostlist);
std::string xhost;
while (hl >> xhost)
{
if (InspIRCd::Match(host, xhost, ascii_case_insensitive_map) || InspIRCd::MatchCIDR(ip, xhost, ascii_case_insensitive_map))
{
return true;
}
}
return false;
}
struct RAIILDAPString
{
char *str;
RAIILDAPString(char *Str)
: str(Str)
{
}
~RAIILDAPString()
{
ldap_memfree(str);
}
operator char*()
{
return str;
}
operator std::string()
{
return str;
}
};
class ModuleLDAPAuth : public Module
{
std::string base;
std::string ldapserver;
std::string username;
std::string password;
std::string attribute;
int searchscope;
LDAP *conn;
bool HandleOper(LocalUser* user, const std::string& opername, const std::string& inputpass)
{
OperIndex::iterator it = ServerInstance->Config->oper_blocks.find(opername);
if (it == ServerInstance->Config->oper_blocks.end())
return false;
ConfigTag* tag = it->second->oper_block;
if (!tag)
return false;
std::string acceptedhosts = tag->getString("host");
std::string hostname = user->ident + "@" + user->host;
if (!OneOfMatches(hostname.c_str(), user->GetIPString().c_str(), acceptedhosts))
return false;
if (!LookupOper(opername, inputpass))
return false;
user->Oper(it->second);
return true;
}
public:
ModuleLDAPAuth()
: conn(NULL)
{
}
void init()
{
Implementation eventlist[] = { I_OnRehash, I_OnPreCommand };
ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
OnRehash(NULL);
}
virtual ~ModuleLDAPAuth()
{
if (conn)
ldap_unbind_ext(conn, NULL, NULL);
}
virtual void OnRehash(User* user)
{
ConfigTag* tag = ServerInstance->Config->ConfValue("ldapoper");
base = tag->getString("baserdn");
ldapserver = tag->getString("server");
std::string scope = tag->getString("searchscope");
username = tag->getString("binddn");
password = tag->getString("bindauth");
attribute = tag->getString("attribute");
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;
}
ModResult OnPreCommand(std::string& command, std::vector<std::string>& parameters, LocalUser* user, bool validated, const std::string& original_line)
{
if (validated && command == "OPER" && parameters.size() >= 2)
{
if (HandleOper(user, parameters[0], parameters[1]))
return MOD_RES_DENY;
}
return MOD_RES_PASSTHRU;
}
bool LookupOper(const std::string& opername, 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;
std::string what = attribute + "=" + opername;
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();
RAIILDAPString DN(ldap_get_dn(conn, entry));
if ((res = ldap_sasl_bind_s(conn, DN, 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("Adds the ability to authenticate opers via LDAP", VF_VENDOR);
}
};
MODULE_INIT(ModuleLDAPAuth)
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