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Patch fast/teleport vulnerability when attached to an entity (#10340)

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Elias Fleckenstein 2020-09-26 18:41:44 +02:00 committed by GitHub
parent 917e357bca
commit 65c15e137f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 24 additions and 1 deletions
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25
src/server/player_sao.cpp
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@ -558,11 +558,34 @@ void PlayerSAO::setMaxSpeedOverride(const v3f &vel)
bool PlayerSAO::checkMovementCheat() bool PlayerSAO::checkMovementCheat()
{ {
if (isAttached() || m_is_singleplayer || if (m_is_singleplayer ||
g_settings->getBool("disable_anticheat")) { g_settings->getBool("disable_anticheat")) {
m_last_good_position = m_base_position; m_last_good_position = m_base_position;
return false; return false;
} }
if (UnitSAO *parent = dynamic_cast<UnitSAO *>(getParent())) {
v3f attachment_pos;
{
int parent_id;
std::string bone;
v3f attachment_rot;
getAttachment(&parent_id, &bone, &attachment_pos, &attachment_rot);
}
v3f parent_pos = parent->getBasePosition();
f32 diff = m_base_position.getDistanceFromSQ(parent_pos) - attachment_pos.getLengthSQ();
const f32 maxdiff = 4.0f * BS; // fair trade-off value for various latencies
if (diff > maxdiff * maxdiff) {
setBasePosition(parent_pos);
actionstream << "Server: " << m_player->getName()
<< " moved away from parent; diff=" << sqrtf(diff) / BS
<< " resetting position." << std::endl;
return true;
}
// Player movement is locked to the entity. Skip further checks
return false;
}
bool cheated = false; bool cheated = false;
/* /*