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[Server] Store a scrypt verifier when an admin resets a password (#7679)

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The temporary password was written as a legacy salt+hash row, which makes the
next login look like an authentication downgrade. A client holding a saved
verifier refuses that downgrade, so the reset locked the account out of every
modern client.

Store the verifier and, where security/legacy_backup_key is configured, keep a
sealed legacy hash of the same temporary password as the downgrade backup, so
pre-challenge clients keep the credential path the reset used to provide.

Without the key no row shape serves both: the verifier and the legacy hash
cannot share one column, so those clients have no path at all. Warn at reset
time that the new password has no pre-challenge path, and say so in
servatrice.ini.example instead of promising that a reset gets them back in.

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
This commit is contained in:
BruebachL 2026-11-02 07:00:48 +01:00 • committed by GitHub
parent e08402ac94
commit ef4574d2b9
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4 changed files with 91 additions and 16 deletions
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81
servatrice/src/servatrice_database_interface.cpp
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@ -755,6 +755,20 @@ QString Servatrice_DatabaseInterface::getUserPasswordData(const QString &user)
return query->value(0).toString();
}
QString Servatrice_DatabaseInterface::sealLegacyBackup(const QString &storedName, const QString &credential)
{
const QByteArray key = server->getLegacyBackupKey();
if (key.isEmpty()) {
return {};
}
const QByteArray aad = storedName.simplified().toUtf8();
const QString sealed = CryptoUtil::encryptSecret(credential.toUtf8(), key, aad);
if (sealed.isEmpty() || sealed.length() > MAX_LEGACY_BACKUP_LENGTH) {
return {};
}
return sealed;
}
bool Servatrice_DatabaseInterface::submitPasswordVerifier(const QString &user, const QString &passwordVerifier)
{
if (server->getAuthenticationMethod() != Servatrice::AuthenticationSql) {
@ -779,18 +793,13 @@ bool Servatrice_DatabaseInterface::submitPasswordVerifier(const QString &user, c
QString sealedBackup;
QDateTime backupUsedAt;
if (PasswordHasher::isLegacyFormat(currentCredential)) {
const QByteArray key = server->getLegacyBackupKey();
if (!key.isEmpty()) {
const QByteArray aad = storedName.simplified().toUtf8();
sealedBackup = CryptoUtil::encryptSecret(currentCredential.toUtf8(), key, aad);
if (sealedBackup.isEmpty() || sealedBackup.length() > MAX_LEGACY_BACKUP_LENGTH) {
qCWarning(DatabaseInterfaceLog)
<< "Failed to seal legacy backup for user" << user << "- account migrates without a downgrade path";
sealedBackup.clear();
} else {
backupUsedAt = QDateTime::currentDateTimeUtc();
}
if (PasswordHasher::isLegacyFormat(currentCredential) && !server->getLegacyBackupKey().isEmpty()) {
sealedBackup = sealLegacyBackup(storedName, currentCredential);
if (sealedBackup.isEmpty()) {
qCWarning(DatabaseInterfaceLog)
<< "Failed to seal legacy backup for user" << user << "- account migrates without a downgrade path";
} else {
backupUsedAt = QDateTime::currentDateTimeUtc();
}
}
@ -1644,6 +1653,54 @@ bool Servatrice_DatabaseInterface::changeUserPassword(const QString &user,
return passwordQuery->numRowsAffected() > 0;
}
bool Servatrice_DatabaseInterface::changeUserPasswordWithLegacyBackup(const QString &user,
const QString &passwordVerifier,
const QString &legacyCredential)
{
if (server->getAuthenticationMethod() != Servatrice::AuthenticationSql) {
return false;
}
if (!checkSql()) {
return false;
}
// Seal against the stored row name, not the caller-supplied one: the name column is
// case-insensitive, so a differently-cased name would fail the tag check on open.
QSqlQuery *nameQuery = prepareQuery("SELECT name FROM {prefix}_users WHERE name = :name");
nameQuery->bindValue(":name", user);
if (!execSqlQuery(nameQuery) || !nameQuery->next()) {
return false;
}
const QString storedName = nameQuery->value(0).toString();
const QString sealedBackup = sealLegacyBackup(storedName, legacyCredential);
const QDateTime backupUsedAt = sealedBackup.isEmpty() ? QDateTime() : QDateTime::currentDateTimeUtc();
if (sealedBackup.isEmpty()) {
// Without a backup a pre-challenge client has nothing to authenticate against: the
// row holds a verifier and the legacy hash it would send cannot match it. Say so,
// because the symptom - the temporary password appearing not to work - shows up on
// a different machine from the one that reset it.
qCWarning(DatabaseInterfaceLog) << "Stored a verifier without a legacy backup for user" << user
<< "- pre-challenge clients cannot use this password"
<< "- check security/legacy_backup_key";
}
QSqlQuery *query = prepareQuery("update {prefix}_users set password_sha512=:password, "
"password_legacy_backup=:backup, password_legacy_backup_used_at=:used_at, "
"passwordLastChangedDate = NOW() where name = :name");
query->bindValue(":password", passwordVerifier);
query->bindValue(":backup", sealedBackup);
query->bindValue(":used_at", backupUsedAt.isValid()
? QVariant(backupUsedAt.toString(QStringLiteral("yyyy-MM-dd HH:mm:ss")))
: QVariant());
query->bindValue(":name", storedName);
if (!execSqlQuery(query)) {
return false;
}
return query->numRowsAffected() > 0;
}
void Servatrice_DatabaseInterface::setForcePasswordChange(const QString &user, bool force)
{
if (!checkSql()) {