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Avoid directly using memcpy to deserialize data

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This commit is contained in:
Nik Bougalis
2019-02-23 10:31:39 -08:00
parent b335adb674
commit e974c7d8a4
1 changed files with 14 additions and 19 deletions
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33
src/ripple/overlay/impl/PeerImp.cpp
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@@ -39,6 +39,7 @@
#include <ripple/overlay/predicates.h>
#include <ripple/protocol/digest.h>
#include <boost/algorithm/clamp.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string.hpp>
#include <algorithm>
@@ -1527,40 +1528,34 @@ PeerImp::onMessage (std::shared_ptr <protocol::TMProposeSet> const& m)
if (set.has_hops() && ! slot_->cluster())
set.set_hops(set.hops() + 1);
auto const type = publicKeyType(
makeSlice(set.nodepubkey()));
auto const sig = makeSlice(set.signature());
// VFALCO Magic numbers are bad
// Roll this into a validation function
if ((! type) ||
(set.currenttxhash ().size () != 32) ||
(set.signature ().size () < 56) ||
(set.signature ().size () > 128)
)
// Preliminary check for the validity of the signature: A DER encoded
// signature can't be longer than 72 bytes.
if ((boost::algorithm::clamp(sig.size(), 64, 72) != sig.size()) ||
(publicKeyType(makeSlice(set.nodepubkey())) != KeyType::secp256k1))
{
JLOG(p_journal_.warn()) << "Proposal: malformed";
fee_ = Resource::feeInvalidSignature;
return;
}
if (set.previousledger ().size () != 32)
if (set.currenttxhash().size() != 32 || set.previousledger().size() != 32)
{
JLOG(p_journal_.warn()) << "Proposal: malformed";
fee_ = Resource::feeInvalidRequest;
return;
}
PublicKey const publicKey (makeSlice(set.nodepubkey()));
auto const proposeHash = uint256::fromVoid(set.currenttxhash().data());
auto const prevLedger = uint256::fromVoid(set.previousledger().data());
PublicKey const publicKey {makeSlice(set.nodepubkey())};
NetClock::time_point const closeTime { NetClock::duration{set.closetime()} };
Slice signature (set.signature().data(), set.signature ().size());
uint256 proposeHash, prevLedger;
memcpy (proposeHash.begin (), set.currenttxhash ().data (), 32);
memcpy (prevLedger.begin (), set.previousledger ().data (), 32);
uint256 suppression = proposalUniqueId (
uint256 const suppression = proposalUniqueId (
proposeHash, prevLedger, set.proposeseq(),
closeTime, publicKey.slice(), signature);
closeTime, publicKey.slice(), sig);
if (! app_.getHashRouter ().addSuppressionPeer (suppression, id_))
{
@@ -1590,7 +1585,7 @@ PeerImp::onMessage (std::shared_ptr <protocol::TMProposeSet> const& m)
auto proposal = RCLCxPeerPos(
publicKey,
signature,
sig,
suppression,
RCLCxPeerPos::Proposal{
prevLedger,