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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* 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 "modules/hash.h"
#include "modules/ssl.h"
#include "main.h"
#include "link.h"
#include "treesocket.h"
const std::string& TreeSocket::GetOurChallenge()
{
return capab->ourchallenge;
}
void TreeSocket::SetOurChallenge(const std::string &c)
{
capab->ourchallenge = c;
}
const std::string& TreeSocket::GetTheirChallenge()
{
return capab->theirchallenge;
}
void TreeSocket::SetTheirChallenge(const std::string &c)
{
capab->theirchallenge = c;
}
std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
{
/* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
* suggesting the use of HMAC to secure the password against various attacks.
*
* Note: If an sha256 provider is not available, we MUST fall back to plaintext with no
* HMAC challenge/response.
*/
HashProvider* sha256 = ServerInstance->Modules->FindDataService<HashProvider>("hash/sha256");
if (sha256 && !challenge.empty())
return "AUTH:" + BinToBase64(sha256->hmac(password, challenge));
if (!challenge.empty() && !sha256)
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Not authenticating to server using SHA256/HMAC because we don't have an SHA256 provider (e.g. m_sha256) loaded!");
return password;
}
bool TreeSocket::ComparePass(const Link& link, const std::string &theirs)
{
capab->auth_fingerprint = !link.Fingerprint.empty();
capab->auth_challenge = !capab->ourchallenge.empty() && !capab->theirchallenge.empty();
std::string fp = SSLClientCert::GetFingerprint(this);
if (capab->auth_fingerprint)
{
/* Require fingerprint to exist and match */
if (link.Fingerprint != fp)
{
ServerInstance->SNO->WriteToSnoMask('l',"Invalid SSL certificate fingerprint on link %s: need \"%s\" got \"%s\"",
link.Name.c_str(), link.Fingerprint.c_str(), fp.c_str());
SendError("Invalid SSL certificate fingerprint " + fp + " - expected " + link.Fingerprint);
return false;
}
}
if (capab->auth_challenge)
{
std::string our_hmac = MakePass(link.RecvPass, capab->ourchallenge);
// Use the timing-safe compare function to compare the hashes
if (!InspIRCd::TimingSafeCompare(our_hmac, theirs))
return false;
}
else
{
// Use the timing-safe compare function to compare the passwords
if (!InspIRCd::TimingSafeCompare(link.RecvPass, theirs))
return false;
}
// Tell opers to set up fingerprint verification if it's not already set up and the SSL mod gave us a fingerprint
// this time
if ((!capab->auth_fingerprint) && (!fp.empty()))
{
ServerInstance->SNO->WriteToSnoMask('l', "SSL certificate fingerprint for link %s is \"%s\". "
"You can improve security by specifying this in <link:fingerprint>.", link.Name.c_str(), fp.c_str());
}
return true;
}
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