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/*
Copyright (C) 2012-24 Miranda NG team (https://miranda-ng.org)
This program 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
of the License.
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 "stdafx.h"
void Hi(const EVP_MD *hashMethod, uint8_t *res, char *passw, size_t passwLen, char *salt, size_t saltLen, int iterations);
struct TScramTask : public TUpgradeTask
{
const EVP_MD *hashMethod;
TScramTask(ThreadData *info, const char *pszMech, const EVP_MD *pMethod, int iPriority) :
TUpgradeTask(info, pszMech),
hashMethod(pMethod)
{
priority = iPriority;
}
~TScramTask() {}
bool perform(const TiXmlElement *src, TiXmlElement *dest) override
{
auto *salt = XmlGetChildByTag(src, "salt", "xmlns", "urn:xmpp:scram-upgrade:0");
if (!salt || !mir_strlen(szInitData))
return false;
int iterations = salt->IntAttribute("iterations");
auto *pszSalt = salt->GetText();
if (!mir_strlen(pszSalt) || !iterations)
return false;
size_t cbNonce, cbSalt;
ptrA szInit((char *)mir_base64_decode(szInitData, &cbNonce));
ptrA szNonce((char*)mir_base64_decode(szInit.get() + 2, &cbNonce));
ptrA szSalt((char *)mir_base64_decode(pszSalt, &cbSalt));
ptrA cbd(mir_base64_encode("n,,", 3)), chl(mir_strdup("")), msg1(mir_strdup(""));
int hashSize = EVP_MD_size(hashMethod);
uint8_t saltedPassw[EVP_MAX_MD_SIZE];
Hi(hashMethod, saltedPassw, info->conn.password, mir_strlen(info->conn.password), szSalt, cbSalt, iterations);
uint8_t clientKey[EVP_MAX_MD_SIZE];
unsigned int len;
HMAC(hashMethod, saltedPassw, hashSize, (uint8_t *)"Client Key", 10, clientKey, &len);
uint8_t storedKey[EVP_MAX_MD_SIZE];
{
EVP_MD_CTX *pctx = EVP_MD_CTX_new();
EVP_DigestInit(pctx, hashMethod);
EVP_DigestUpdate(pctx, clientKey, hashSize);
EVP_DigestFinal(pctx, storedKey, &len);
EVP_MD_CTX_free(pctx);
}
uint8_t clientSig[EVP_MAX_MD_SIZE];
CMStringA authmsg(FORMAT, "%s,%s,c=%s,r=%s", msg1, chl.get(), cbd.get(), szNonce.get());
HMAC(hashMethod, storedKey, hashSize, (uint8_t *)authmsg.c_str(), authmsg.GetLength(), clientSig, &len);
uint8_t clientProof[EVP_MAX_MD_SIZE];
for (int j = 0; j < hashSize; j++)
clientProof[j] = clientKey[j] ^ clientSig[j];
ptrA szEncoded(mir_base64_encode(clientProof, hashSize));
auto *pHash = dest << XCHILD("hash", szEncoded);
pHash << XATTR("xmlns", "urn:xmpp:scram-upgrade:0");
return true;
}
};
/////////////////////////////////////////////////////////////////////////////////////////
// SASL2: common tasks processing methods
void CJabberProto::OnProcessUpgrade(const TiXmlElement *n, ThreadData *info)
{
TUpgradeTask *pTask;
auto *szMechanism = n->GetText();
if (!mir_strcmp(szMechanism, "UPGR-SCRAM-SHA-1"))
pTask = new TScramTask(info, szMechanism, EVP_sha1(), 500);
else if (!mir_strcmp(szMechanism, "UPGR-SCRAM-SHA-256"))
pTask = new TScramTask(info, szMechanism, EVP_sha256(), 520);
else if (!mir_strcmp(szMechanism, "UPGR-SCRAM-SHA-384"))
pTask = new TScramTask(info, szMechanism, EVP_sha384(), 530);
else if (!mir_strcmp(szMechanism, "UPGR-SCRAM-SHA-512"))
pTask = new TScramTask(info, szMechanism, EVP_sha512(), 540);
else {
debugLogA("Unsupported mechanism for upgrade: %s, skipping", szMechanism);
return;
}
m_arSaslUpgrade.insert(pTask);
}
void CJabberProto::OnProcessContinue(const TiXmlElement *node, ThreadData *info)
{
if (!node->Attribute("xmlns", JABBER_FEAT_SASL2)) {
debugLogA("Missing xmlns for continue, ignoring");
return;
}
TUpgradeTask *pTask = nullptr;
for (auto *task : TiXmlFilter(node->FirstChildElement("tasks"), "task"))
for (auto &it : m_arSaslUpgrade)
if (!mir_strcmp(it->getName(), task->GetText())) {
pTask = it;
break;
}
if (!pTask) {
debugLogA("Unsupported task type, ignoring");
info->send("</stream:stream>"); // bye-bye
return;
}
pTask->setInitData(XmlGetChildText(node, "additional-data"));
info->m_saslUpgrade = pTask;
XmlNode next("next");
next << XATTR("xmlns", JABBER_FEAT_SASL2) << XATTR("task", pTask->getName());
info->send(next);
}
void CJabberProto::OnProcessTaskData(const TiXmlElement *node, ThreadData *info)
{
if (!info->m_saslUpgrade)
return;
XmlNode reply("task-data");
reply << XATTR("xmlns", JABBER_FEAT_SASL2);
if (info->m_saslUpgrade->perform(node, reply))
info->send(reply);
else
info->send("</stream:stream>"); // bye-bye
}
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