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wireguard_proto.cpp
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wireguard_proto.cpp
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// SPDX-License-Identifier: AGPL-1.0-only
// Copyright (C) 2018 Ludvig Strigeus <[email protected]>. All Rights Reserved.
#include "stdafx.h"
#include "wireguard_proto.h"
#include "crypto/chacha20poly1305.h"
#include "crypto/blake2s/blake2s.h"
#include "crypto/curve25519/curve25519-donna.h"
#include "crypto/aesgcm/aes.h"
#include "crypto/siphash/siphash.h"
#include "tunsafe_endian.h"
#include "util.h"
#include "crypto_ops.h"
#include "bit_ops.h"
#include "tunsafe_cpu.h"
#include <algorithm>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
enum {
kTunsafeExtensionClientID = ('T' | 'S' << 8)
};
static const uint8 kLabelCookie[] = {'c', 'o', 'o', 'k', 'i', 'e', '-', '-'};
static const uint8 kLabelMac1[] = {'m', 'a', 'c', '1', '-', '-', '-', '-'};
static const uint8 kWgInitHash[WG_HASH_LEN] = {0x22,0x11,0xb3,0x61,0x08,0x1a,0xc5,0x66,0x69,0x12,0x43,0xdb,0x45,0x8a,0xd5,0x32,0x2d,0x9c,0x6c,0x66,0x22,0x93,0xe8,0xb7,0x0e,0xe1,0x9c,0x65,0xba,0x07,0x9e,0xf3};
static const uint8 kWgInitChainingKey[WG_HASH_LEN] = {0x60,0xe2,0x6d,0xae,0xf3,0x27,0xef,0xc0,0x2e,0xc3,0x35,0xe2,0xa0,0x25,0xd2,0xd0,0x16,0xeb,0x42,0x06,0xf8,0x72,0x77,0xf5,0x2d,0x38,0xd1,0x98,0x8b,0x78,0xcd,0x36};
ReplayDetector::ReplayDetector() {
expected_seq_nr_ = 0;
memset(bitmap_, 0, sizeof(bitmap_));
}
ReplayDetector::~ReplayDetector() {
}
bool ReplayDetector::CheckReplay(uint64 seq_nr) {
uint64 slot = seq_nr / BITS_PER_ENTRY;
uint64 expected_seq_nr = expected_seq_nr_;
if (seq_nr >= expected_seq_nr) {
uint64 prev_slot = (expected_seq_nr + BITS_PER_ENTRY - 1) / BITS_PER_ENTRY - 1, n;
if ((n = slot - prev_slot) != 0) {
size_t nn = (size_t)std::min<uint64>(n, BITMAP_SIZE);
do {
bitmap_[(prev_slot + nn) & BITMAP_MASK] = 0;
} while (--nn);
}
expected_seq_nr_ = seq_nr + 1;
} else if (seq_nr + WINDOW_SIZE <= expected_seq_nr) {
return false;
}
uint32 mask = 1 << (seq_nr & (BITS_PER_ENTRY - 1)), prev;
prev = bitmap_[slot & BITMAP_MASK];
bitmap_[slot & BITMAP_MASK] = prev | mask;
return (prev & mask) == 0;
}
WgDevice::WgDevice() {
peers_ = NULL;
last_peer_ptr_ = &peers_;
plugin_ = NULL;
is_private_key_initialized_ = false;
next_rng_slot_ = 0;
main_thread_scheduled_ = NULL;
main_thread_scheduled_last_ = &main_thread_scheduled_;
low_resolution_timestamp_ = cookie_secret_timestamp_ = OsGetMilliseconds();
OsGetRandomBytes(cookie_secret_, sizeof(cookie_secret_));
OsGetRandomBytes((uint8*)random_number_input_, sizeof(random_number_input_));
main_thread_id_ = GetCurrentThreadId();
memset(s_priv_, 0, sizeof(s_priv_));
memset(s_pub_, 0, sizeof(s_pub_));
}
WgDevice::~WgDevice() {
assert(IsMainThread());
RemoveAllPeers();
}
void WgDevice::SecondLoop(uint64 now) {
assert(IsMainThread());
low_resolution_timestamp_ = now;
if (rate_limiter_.is_used()) {
uint32 k[5];
for (size_t i = 0; i < ARRAY_SIZE(k); i++)
k[i] = GetRandomNumber();
rate_limiter_.Periodic(k);
}
}
uint32 WgDevice::InsertInKeyIdLookup(WgPeer *peer, WgKeypair *kp) {
assert(IsMainThread());
assert(peer);
for (;;) {
uint32 v = GetRandomNumber();
if (v == 0)
continue;
// Take the exclusive lock since we're modifying it.
WG_SCOPED_RWLOCK_EXCLUSIVE(key_id_lookup_lock_);
std::pair<WgPeer*, WgKeypair*> &peer_and_keypair = key_id_lookup_[v];
if (peer_and_keypair.first == NULL) {
peer_and_keypair = std::make_pair(peer, kp);
uint32 &x = (kp ? kp->local_key_id : peer->local_key_id_during_hs_);
uint32 old = x;
x = v;
if (old)
key_id_lookup_.erase(old);
return v;
}
}
}
std::pair<WgPeer*, WgKeypair*> *WgDevice::LookupPeerInKeyIdLookup(uint32 key_id) {
// This function is only ever called by the main thread, so no need to lock,
// since the main thread is the only mutator.
assert(IsMainThread());
auto it = key_id_lookup_.find(key_id);
return (it != key_id_lookup_.end() && it->second.second == NULL) ? &it->second : NULL;
}
WgKeypair *WgDevice::LookupKeypairByKeyId(uint32 key_id) {
// This function can be called from any thread, so make sure to
// lock using the shared lock.
WG_SCOPED_RWLOCK_SHARED(key_id_lookup_lock_);
auto it = key_id_lookup_.find(key_id);
return (it != key_id_lookup_.end()) ? it->second.second : NULL;
}
uint32 WgDevice::GetRandomNumber() {
assert(IsMainThread());
size_t slot;
if ((slot = next_rng_slot_) == 0) {
blake2s(random_number_output_, sizeof(random_number_output_), random_number_input_, sizeof(random_number_input_), NULL, 0);
random_number_input_[0]++;
slot = BLAKE2S_OUTBYTES / 4;
}
next_rng_slot_ = (uint8) --slot;
return random_number_output_[slot];
}
static void BlakeX2(uint8 *dst, size_t dst_size, const uint8 *a, size_t a_size, const uint8 *b, size_t b_size) {
blake2s_state b2s;
blake2s_init(&b2s, dst_size);
blake2s_update(&b2s, a, a_size);
blake2s_update(&b2s, b, b_size);
blake2s_final(&b2s, dst, dst_size);
}
static inline void BlakeMix(uint8 dst[WG_HASH_LEN], const uint8 *a, size_t a_size) {
BlakeX2(dst, WG_HASH_LEN, dst, WG_HASH_LEN, a, a_size);
}
static inline void ComputeHKDF2DH(uint8 ci[WG_HASH_LEN], uint8 k[WG_SYMMETRIC_KEY_LEN], const uint8 priv[WG_PUBLIC_KEY_LEN], const uint8 pub[WG_PUBLIC_KEY_LEN]) {
uint8 dh[WG_PUBLIC_KEY_LEN];
curve25519_donna(dh, priv, pub);
blake2s_hkdf(ci, WG_HASH_LEN, k, WG_SYMMETRIC_KEY_LEN, NULL, 32, dh, sizeof(dh), ci, WG_HASH_LEN);
memzero_crypto(dh, sizeof(dh));
}
void WgDevice::SetPrivateKey(const uint8 private_key[WG_PUBLIC_KEY_LEN]) {
assert(IsMainThread());
// Derive the public key from the private key.
memcpy(s_priv_, private_key, sizeof(s_priv_));
curve25519_donna(s_pub_, s_priv_, kCurve25519Basepoint);
// Precompute: precomputed_cookie_label_hash_ := HASH(LABEL-COOKIE || Spub_m)
// precomputed_label_mac1_hash_ := HASH(MAC1-COOKIE || Spub_m)
BlakeX2(precomputed_cookie_key_, sizeof(precomputed_cookie_key_),
kLabelCookie, sizeof(kLabelCookie), s_pub_, sizeof(s_pub_));
BlakeX2(precomputed_mac1_key_, sizeof(precomputed_mac1_key_),
kLabelMac1, sizeof(kLabelMac1), s_pub_, sizeof(s_pub_));
is_private_key_initialized_ = true;
// Recompute peer data because it depends on my privkey
for (WgPeer *peer = peers_; peer; peer = peer->next_peer_)
peer->SetPublicKey(peer->s_remote_);
}
WgPeer *WgDevice::AddPeer() {
assert(IsMainThread());
WgPeer *peer = new WgPeer(this);
return peer;
}
void WgDevice::RemoveAllPeers() {
assert(IsMainThread());
while (peers_)
peers_->RemovePeer();
}
WgPeer *WgDevice::GetPeerFromPublicKey(const WgPublicKey &pubkey) {
assert(IsMainThread());
auto it = peer_id_lookup_.find(pubkey);
return (it != peer_id_lookup_.end()) ? it->second : NULL;
}
bool WgDevice::CheckCookieMac1(Packet *packet) {
assert(IsMainThread());
uint8 mac[WG_COOKIE_LEN];
const uint8 *data = packet->data;
size_t data_size = packet->size;
blake2s(mac, sizeof(mac), data, data_size - WG_COOKIE_LEN * 2, precomputed_mac1_key_, sizeof(precomputed_mac1_key_));
return !memcmp_crypto(mac, data + data_size - WG_COOKIE_LEN * 2, WG_COOKIE_LEN);
}
void WgDevice::MakeCookie(uint8 cookie[WG_COOKIE_LEN], Packet *packet) {
assert(IsMainThread());
blake2s_state b2s;
uint64 now = OsGetMilliseconds();
if (now - cookie_secret_timestamp_ >= COOKIE_SECRET_MAX_AGE_MS) {
cookie_secret_timestamp_ = now;
OsGetRandomBytes(cookie_secret_, sizeof(cookie_secret_));
}
blake2s_init_key(&b2s, WG_COOKIE_LEN, cookie_secret_, sizeof(cookie_secret_));
if (packet->addr.sin.sin_family == AF_INET)
blake2s_update(&b2s, &packet->addr.sin.sin_addr, 4);
else if (packet->addr.sin.sin_family == AF_INET6)
blake2s_update(&b2s, &packet->addr.sin6.sin6_addr, sizeof(packet->addr.sin6.sin6_addr));
blake2s_update(&b2s, &packet->addr.sin6.sin6_port, 2);
blake2s_final(&b2s, cookie, WG_COOKIE_LEN);
}
bool WgDevice::CheckCookieMac2(Packet *packet) {
assert(IsMainThread());
uint8 cookie[WG_COOKIE_LEN];
uint8 mac[WG_COOKIE_LEN];
MakeCookie(cookie, packet);
blake2s(mac, sizeof(mac), packet->data, packet->size - WG_COOKIE_LEN, cookie, sizeof(cookie));
return !memcmp_crypto(mac, packet->data + packet->size - WG_COOKIE_LEN, WG_COOKIE_LEN);
}
void WgDevice::CreateCookieMessage(MessageHandshakeCookie *dst, Packet *packet, uint32 remote_key_id) {
assert(IsMainThread());
dst->type = MESSAGE_HANDSHAKE_COOKIE;
dst->receiver_key_id = remote_key_id;
MakeCookie(dst->cookie_enc, packet);
OsGetRandomBytes(dst->nonce, sizeof(dst->nonce));
MessageMacs *mac = (MessageMacs *)(packet->data + packet->size - sizeof(MessageMacs));
xchacha20poly1305_encrypt(dst->cookie_enc, dst->cookie_enc, WG_COOKIE_LEN, mac->mac1, WG_COOKIE_LEN, dst->nonce, precomputed_cookie_key_);
}
void WgDevice::EraseKeypairAddrEntry_Locked(WgKeypair *kp) {
// todo: figure out how to make this multithread safe.
WgAddrEntry *ae = kp->addr_entry;
assert(ae->ref_count >= 1);
assert(ae->ref_count == !!ae->keys[0] + !!ae->keys[1] + !!ae->keys[2]);
assert(ae->keys[kp->addr_entry_slot - 1] == kp);
kp->addr_entry = NULL;
ae->keys[kp->addr_entry_slot - 1] = NULL;
kp->addr_entry_slot = 0;
if (ae->ref_count-- == 1) {
addr_entry_lookup_.erase(ae->addr_entry_id);
delete ae;
}
}
static WgAddrEntry::IpPort ConvertIpAddrToAddrX(const IpAddr &src) {
WgAddrEntry::IpPort r;
if (src.sin.sin_family == AF_INET) {
Write64(r.bytes, src.sin.sin_addr.s_addr);
Write64(r.bytes + 8, 0);
Write32(r.bytes + 16, src.sin.sin_port);
} else {
memcpy(r.bytes, &src.sin6.sin6_addr, 16);
Write32(r.bytes + 16, (AF_INET6 << 16) + src.sin6.sin6_port);
}
return r;
}
WgKeypair *WgDevice::LookupKeypairInAddrEntryMap(const IpAddr &addr, uint32 slot) {
// Convert IpAddr to WgAddrEntry::IpPort suitable for use in hash.
WgAddrEntry::IpPort addr_x = ConvertIpAddrToAddrX(addr);
WG_SCOPED_RWLOCK_SHARED(addr_entry_lookup_lock_);
auto it = addr_entry_lookup_.find(addr_x);
if (it == addr_entry_lookup_.end())
return NULL;
WgAddrEntry *addr_entry = (WgAddrEntry*)it->second;
return addr_entry->keys[slot];
}
void WgDevice::UpdateKeypairAddrEntry_Locked(const IpAddr &addr, WgKeypair *keypair) {
assert(keypair->peer->IsPeerLocked());
WgAddrEntry::IpPort addr_x = ConvertIpAddrToAddrX(addr);
{
WG_SCOPED_RWLOCK_SHARED(addr_entry_lookup_lock_);
if (keypair->addr_entry != NULL && keypair->addr_entry->addr_entry_id == addr_x) {
keypair->broadcast_short_key = 1;
return;
}
}
WG_SCOPED_RWLOCK_EXCLUSIVE(addr_entry_lookup_lock_);
if (keypair->addr_entry != NULL)
EraseKeypairAddrEntry_Locked(keypair);
WgAddrEntry **aep = (WgAddrEntry**)&addr_entry_lookup_[addr_x], *ae;
if ((ae = *aep) == NULL) {
*aep = ae = new WgAddrEntry(addr_x);
} else {
// Ensure we don't insert new things in this addr entry too often.
if (ae->time_of_last_insertion + 1000 * 60 > low_resolution_timestamp_)
return;
}
ae->time_of_last_insertion = low_resolution_timestamp_;
// Update slot #
uint32 next_slot = ae->next_slot;
ae->next_slot = (next_slot == 2) ? 0 : next_slot + 1;
WgKeypair *old_keypair = ae->keys[next_slot];
ae->keys[next_slot] = keypair;
keypair->addr_entry = ae;
keypair->addr_entry_slot = next_slot + 1;
if (old_keypair != NULL) {
old_keypair->addr_entry = NULL;
old_keypair->addr_entry_slot = 0;
} else {
ae->ref_count++;
}
assert(ae->ref_count == !!ae->keys[0] + !!ae->keys[1] + !!ae->keys[2]);
keypair->broadcast_short_key = 1;
}
WgPeer::WgPeer(WgDevice *dev) {
assert(dev->IsMainThread());
dev_ = dev;
endpoint_.sin.sin_family = 0;
data_endpoint_.sin.sin_family = 0;
endpoint_protocol_ = 0;
data_endpoint_protocol_ = 0;
next_peer_ = NULL;
peer_extra_data_ = NULL;
curr_keypair_ = next_keypair_ = prev_keypair_ = NULL;
expect_cookie_reply_ = false;
has_mac2_cookie_ = false;
pending_keepalive_ = false;
marked_for_delete_ = false;
allow_multicast_through_peer_ = false;
allow_endpoint_change_ = true;
local_key_id_during_hs_ = 0;
last_handshake_init_timestamp_ = -1000000ll;
last_handshake_init_recv_timestamp_ = 0;
last_complete_handskake_timestamp_ = 0;
persistent_keepalive_ms_ = 0;
keepalive_timeout_ms_ = KEEPALIVE_TIMEOUT_MS;
rx_bytes_ = 0;
tx_bytes_ = 0;
timers_ = 0;
first_queued_packet_ = NULL;
last_queued_packet_ptr_ = &first_queued_packet_;
num_queued_packets_ = 0;
handshake_attempts_ = 0;
total_handshake_attempts_ = 0;
num_ciphers_ = 0;
cipher_prio_ = 0;
main_thread_scheduled_ = 0;
memset(last_timestamp_, 0, sizeof(last_timestamp_));
ipv4_broadcast_addr_ = 0xffffffff;
memset(features_, 0, sizeof(features_));
memset(preshared_key_, 0, sizeof(preshared_key_));
memset(&s_remote_, 0, sizeof(s_remote_));
// Insert into the parent's linked list
*dev_->last_peer_ptr_ = this;
dev_->last_peer_ptr_ = &next_peer_;
}
WgPeer::~WgPeer() {
// do not delete this directly, instead call RemovePeer
assert(marked_for_delete_);
assert(dev_->IsMainThread());
assert(curr_keypair_ == NULL && next_keypair_ == NULL && prev_keypair_ == NULL);
assert(local_key_id_during_hs_ == 0);
assert(first_queued_packet_ == NULL);
if (peer_extra_data_)
peer_extra_data_->OnPeerDestroy();
}
void WgPeer::DelayedDelete(void *x) {
WgPeer *peer = (WgPeer*)x;
assert(peer->dev_->IsMainThread());
if (peer->main_thread_scheduled_ != 0) {
WG_ACQUIRE_LOCK(peer->dev_->main_thread_scheduled_lock_);
// Unlink myself from the main thread scheduled list
for (WgPeer **pp = &peer->dev_->main_thread_scheduled_; *pp; pp = &(*pp)->main_thread_scheduled_next_) {
if (*pp == peer) {
*pp = peer->main_thread_scheduled_next_;
break;
}
}
WG_RELEASE_LOCK(peer->dev_->main_thread_scheduled_lock_);
}
delete peer;
}
void WgPeer::RemovePeer() {
assert(dev_->IsMainThread());
assert(!marked_for_delete_);
// Find and unlink the peer from the parent's peer list
WgPeer **pp = &dev_->peers_;
while (*pp != this)
pp = &(*pp)->next_peer_;
if ((*pp = next_peer_) == NULL)
dev_->last_peer_ptr_ = pp;
RemoveAllIps();
dev_->peer_id_lookup_.erase(s_remote_);
WG_ACQUIRE_LOCK(mutex_);
marked_for_delete_ = true;
ClearKeys_Locked();
ClearHandshake_Locked();
ClearPacketQueue_Locked();
WG_RELEASE_LOCK(mutex_);
// The WgPeer instance may still be accessible from
// worker threads that already started processing a packet,
// so defer the actual delete of it.
dev_->delayed_delete_.Add(&WgPeer::DelayedDelete, this);
}
void WgPeer::ClearKeys_Locked() {
assert(dev_->IsMainThread() && IsPeerLocked());
DeleteKeypair(&curr_keypair_);
DeleteKeypair(&next_keypair_);
DeleteKeypair(&prev_keypair_);
}
void WgPeer::ClearHandshake_Locked() {
assert(dev_->IsMainThread() && IsPeerLocked());
uint32 v = local_key_id_during_hs_;
if (v != 0) {
local_key_id_during_hs_ = 0;
WG_SCOPED_RWLOCK_EXCLUSIVE(dev_->key_id_lookup_lock_);
dev_->key_id_lookup_.erase(v);
}
}
void WgPeer::ClearPacketQueue_Locked() {
assert(dev_->IsMainThread() && IsPeerLocked());
Packet *packet;
while ((packet = first_queued_packet_) != NULL) {
first_queued_packet_ = Packet_NEXT(packet);
FreePacket(packet);
}
last_queued_packet_ptr_ = &first_queued_packet_;
num_queued_packets_ = 0;
}
void WgPeer::AddPacketToPeerQueue_Locked(Packet *packet) {
assert(IsPeerLocked());
assert(!marked_for_delete_);
// Keep only the first MAX_QUEUED_PACKETS packets.
while (num_queued_packets_ >= MAX_QUEUED_PACKETS_PER_PEER) {
Packet *packet = first_queued_packet_;
first_queued_packet_ = Packet_NEXT(packet);
num_queued_packets_--;
FreePacket(packet);
}
// Add the packet to the out queue that will get sent once handshake completes
*last_queued_packet_ptr_ = packet;
last_queued_packet_ptr_ = &Packet_NEXT(packet);
Packet_NEXT(packet) = NULL;
num_queued_packets_++;
}
void WgPeer::SetPublicKey(const WgPublicKey &spub) {
assert(dev_->IsMainThread());
assert(IsOnlyZeros(s_remote_.bytes, sizeof(s_remote_.bytes)) ||
memcmp(s_remote_.bytes, spub.bytes, sizeof(s_remote_.bytes)) == 0);
s_remote_ = spub;
dev_->peer_id_lookup_[s_remote_] = this;
if (!dev_->is_private_key_initialized_)
return;
// Precompute: s_priv_pub_ := DH(sprivr, spubi)
curve25519_donna(s_priv_pub_, dev_->s_priv_, s_remote_.bytes);
// Precompute: precomputed_cookie_key_ := HASH(LABEL-COOKIE || Spub_m)
// precomputed_mac1_key_ := HASH(MAC1-COOKIE || Spub_m)
BlakeX2(precomputed_cookie_key_, sizeof(precomputed_cookie_key_),
kLabelCookie, sizeof(kLabelCookie), s_remote_.bytes, WG_PUBLIC_KEY_LEN);
BlakeX2(precomputed_mac1_key_, sizeof(precomputed_mac1_key_),
kLabelMac1, sizeof(kLabelMac1), s_remote_.bytes, WG_PUBLIC_KEY_LEN);
// Remove the peer's keys
WG_ACQUIRE_LOCK(mutex_);
ClearKeys_Locked();
ClearHandshake_Locked();
WG_RELEASE_LOCK(mutex_);
}
void WgPeer::SetPresharedKey(const uint8 preshared_key[WG_SYMMETRIC_KEY_LEN]) {
if (preshared_key)
memcpy(preshared_key_, preshared_key, sizeof(preshared_key_));
else
memset(preshared_key_, 0, sizeof(preshared_key_));
}
// run on the client
void WgPeer::CreateMessageHandshakeInitiation(Packet *packet) {
assert(dev_->IsMainThread());
uint8 k[WG_SYMMETRIC_KEY_LEN];
MessageHandshakeInitiation *dst = (MessageHandshakeInitiation *)packet->data;
// Ci := HASH(CONSTRUCTION)
memcpy(hs_.ci, kWgInitChainingKey, sizeof(hs_.ci));
// Hi := HASH(Ci || IDENTIFIER)
memcpy(hs_.hi, kWgInitHash, sizeof(hs_.hi));
// Hi := HASH(Hi || Spub_r)
BlakeMix(hs_.hi, s_remote_.bytes, sizeof(s_remote_));
// (Epriv_r, Epub_r) := DH-GENERATE()
// msg.ephemeral = Epub_r
OsGetRandomBytes(hs_.e_priv, sizeof(hs_.e_priv));
curve25519_normalize(hs_.e_priv);
curve25519_donna(dst->ephemeral, hs_.e_priv, kCurve25519Basepoint);
// Ci := KDF_1(Ci, msg.ephemeral)
blake2s_hkdf(hs_.ci, sizeof(hs_.ci), NULL, 32, NULL, 32, dst->ephemeral, sizeof(dst->ephemeral), hs_.ci, WG_HASH_LEN);
// Hi := HASH(Hi || msg.ephemeral)
BlakeMix(hs_.hi, dst->ephemeral, sizeof(dst->ephemeral));
// (Ci, K) := KDF2(Ci, DH(epriv, spub_r))
ComputeHKDF2DH(hs_.ci, k, hs_.e_priv, s_remote_.bytes);
// msg.static = AEAD(K, 0, Spub_i, Hi)
chacha20poly1305_encrypt(dst->static_enc, dev_->s_pub_, sizeof(dev_->s_pub_), hs_.hi, sizeof(hs_.hi), 0, k);
// Hi := HASH(Hi || msg.static)
BlakeMix(hs_.hi, dst->static_enc, sizeof(dst->static_enc));
// (Ci, K) := KDF2(Ci, DH(sprivr, spubi))
blake2s_hkdf(hs_.ci, sizeof(hs_.ci), k, sizeof(k), NULL, 32, s_priv_pub_, sizeof(s_priv_pub_), hs_.ci, WG_HASH_LEN);
// TAI64N
OsGetTimestampTAI64N(dst->timestamp_enc);
int extfield_size = 0;
if (WITH_HANDSHAKE_EXT) {
extfield_size = WriteHandshakeExtension(dst->timestamp_enc + WG_TIMESTAMP_LEN + 4, NULL);
if (dev_->plugin_) {
uint32 rv = dev_->plugin_->OnHandshake0(this, dst->timestamp_enc + WG_TIMESTAMP_LEN + 4 + extfield_size, MAX_SIZE_OF_HANDSHAKE_EXTENSION - 4 - extfield_size, dst->ephemeral);
assert(!(rv & WgPlugin::kHandshakeResponseFail));
extfield_size += rv;
}
if (extfield_size) {
WriteLE32(dst->timestamp_enc + WG_TIMESTAMP_LEN, kTunsafeExtensionClientID);
extfield_size += 4;
}
}
// msg.timestamp := AEAD(K, 0, timestamp, hi)
chacha20poly1305_encrypt(dst->timestamp_enc, dst->timestamp_enc, extfield_size + WG_TIMESTAMP_LEN, hs_.hi, sizeof(hs_.hi), 0, k);
// Hi := HASH(Hi || msg.timestamp)
BlakeMix(hs_.hi, dst->timestamp_enc, extfield_size + WG_TIMESTAMP_LEN + WG_MAC_LEN);
packet->size = (unsigned)(sizeof(MessageHandshakeInitiation) + extfield_size);
dst->sender_key_id = dev_->InsertInKeyIdLookup(this, NULL);
dst->type = MESSAGE_HANDSHAKE_INITIATION;
memzero_crypto(k, sizeof(k));
WriteMacToPacket((uint8*)dst, (MessageMacs*)((uint8*)&dst->mac + extfield_size));
}
// Parsed by server
WgPeer *WgPeer::ParseMessageHandshakeInitiation(WgDevice *dev, Packet *packet) { // const MessageHandshakeInitiation *src, MessageHandshakeResponse *dst) {
assert(dev->IsMainThread());
// Copy values into handshake once we've validated it all.
uint8 ci[WG_HASH_LEN];
uint8 hi[WG_HASH_LEN];
union {
uint8 k[WG_SYMMETRIC_KEY_LEN];
uint8 e_priv[WG_PUBLIC_KEY_LEN];
};
union {
WgPublicKey spubi;
uint8 e_remote[WG_PUBLIC_KEY_LEN];
uint8 hi2[WG_HASH_LEN];
};
uint8 t[WG_HASH_LEN];
WgPeer *peer;
WgKeypair *keypair = NULL;
uint32 remote_key_id;
uint64 now;
uint8 extbuf[MAX_SIZE_OF_HANDSHAKE_EXTENSION + WG_TIMESTAMP_LEN];
MessageHandshakeInitiation *src = (MessageHandshakeInitiation *)packet->data;
MessageHandshakeResponse *dst;
int extfield_size;
// Ci := HASH(CONSTRUCTION)
memcpy(ci, kWgInitChainingKey, sizeof(ci));
// Hi := HASH(Ci || IDENTIFIER)
memcpy(hi, kWgInitHash, sizeof(hi));
// Hi := HASH(Hi || Spub_r)
BlakeMix(hi, dev->s_pub_, sizeof(dev->s_pub_));
// Ci := KDF_1(Ci, msg.ephemeral)
blake2s_hkdf(ci, sizeof(ci), NULL, 32, NULL, 32, src->ephemeral, sizeof(src->ephemeral), ci, WG_HASH_LEN);
// Hi := HASH(Hi || msg.ephemeral)
BlakeMix(hi, src->ephemeral, sizeof(src->ephemeral));
// (Ci, K) := KDF2(Ci, DH(spriv, msg.ephemeral))
ComputeHKDF2DH(ci, k, dev->s_priv_, src->ephemeral);
// Spub_i = AEAD_DEC(K, 0, msg.static, Hi)
if (!chacha20poly1305_decrypt(spubi.bytes, src->static_enc, sizeof(src->static_enc), hi, sizeof(hi), 0, k))
goto getout;
// Hi := HASH(Hi || msg.static)
BlakeMix(hi, src->static_enc, sizeof(src->static_enc));
// Lookup the peer with this ID
while ((peer = dev->GetPeerFromPublicKey(spubi)) == NULL) {
if (dev->plugin_ == NULL || !dev->plugin_->HandleUnknownPeerId(spubi.bytes, packet))
goto getout;
}
// (Ci, K) := KDF2(Ci, DH(sprivr, spubi))
blake2s_hkdf(ci, sizeof(ci), k, sizeof(k), NULL, 32, peer->s_priv_pub_, sizeof(peer->s_priv_pub_), ci, WG_HASH_LEN);
// Hi2 := Hi
memcpy(hi2, hi, sizeof(hi2));
extfield_size = packet->size - sizeof(MessageHandshakeInitiation);
if ((uint32)extfield_size > MAX_SIZE_OF_HANDSHAKE_EXTENSION)
goto getout;
// Hi := HASH(Hi || msg.timestamp)
BlakeMix(hi, src->timestamp_enc, extfield_size + WG_TIMESTAMP_LEN + WG_MAC_LEN);
// TIMESTAMP := AEAD_DEC(K, 0, msg.timestamp, hi2)
if (!chacha20poly1305_decrypt(extbuf, src->timestamp_enc, extfield_size + WG_TIMESTAMP_LEN + WG_MAC_LEN, hi2, sizeof(hi2), 0, k))
goto getout;
// Replay attack?
if (memcmp(extbuf, peer->last_timestamp_, WG_TIMESTAMP_LEN) <= 0)
goto getout;
// Flood attack?
now = OsGetMilliseconds();
if (now < peer->last_handshake_init_recv_timestamp_ + MIN_HANDSHAKE_INTERVAL_MS)
goto getout;
// Remember all the information we need to produce a response cause we cannot touch src again
peer->last_handshake_init_recv_timestamp_ = now;
memcpy(peer->last_timestamp_, extbuf, sizeof(peer->last_timestamp_));
memcpy(e_remote, src->ephemeral, sizeof(e_remote));
remote_key_id = src->sender_key_id;
dst = (MessageHandshakeResponse *)src;
dst->receiver_key_id = remote_key_id;
// (Epriv_r, Epub_r) := DH-GENERATE()
// msg.ephemeral = Epub_r
OsGetRandomBytes(e_priv, sizeof(e_priv));
curve25519_normalize(e_priv);
curve25519_donna(dst->ephemeral, e_priv, kCurve25519Basepoint);
// Hr := HASH(Hr || msg.ephemeral)
BlakeMix(hi, dst->ephemeral, sizeof(dst->ephemeral));
// Ci := KDF_1(Ci, msg.ephemeral)
blake2s_hkdf(ci, sizeof(ci), NULL, 32, NULL, 32, dst->ephemeral, sizeof(dst->ephemeral), ci, WG_HASH_LEN);
// Ci : = KDF2(Ci, DH(epriv, epub))
ComputeHKDF2DH(ci, NULL, e_priv, e_remote);
// Ci : = KDF2(Ci, DH(epriv, spub))
ComputeHKDF2DH(ci, NULL, e_priv, peer->s_remote_.bytes);
// (Ci, T, K) := KDF3(Ci, Q)
blake2s_hkdf(ci, sizeof(ci), t, sizeof(t), k, sizeof(k), peer->preshared_key_, sizeof(preshared_key_), ci, WG_HASH_LEN);
// Hr := HASH(Hr || T)
BlakeMix(hi, t, sizeof(t));
keypair = WgPeer::CreateNewKeypair(false, ci, remote_key_id);
if (keypair) {
if (WITH_HANDSHAKE_EXT && !peer->ParseExtendedHandshake(keypair, extbuf + WG_TIMESTAMP_LEN, extfield_size))
goto getout;
int extfield_out_size = 0;
if (WITH_HANDSHAKE_EXT && extfield_size)
extfield_out_size = peer->WriteHandshakeExtension(dst->empty_enc + 4, keypair);
// Allow plugin to determine what to do with the packet,
// it can append new headers to the response, and decide what to do.
if (WITH_HANDSHAKE_EXT && dev->plugin_) {
uint32 rv = dev->plugin_->OnHandshake1(peer, extbuf + WG_TIMESTAMP_LEN, extfield_size, e_remote,
dst->empty_enc + 4 + extfield_out_size, MAX_SIZE_OF_HANDSHAKE_EXTENSION - 4 - extfield_out_size, dst->ephemeral);
if (rv == WgPlugin::kHandshakeResponseDrop)
goto getout;
if (rv & WgPlugin::kHandshakeResponseFail)
delete exch_null(keypair);
extfield_out_size += rv & ~WgPlugin::kHandshakeResponseFail;
}
if (extfield_out_size) {
WriteLE32(dst->empty_enc, kTunsafeExtensionClientID);
extfield_out_size += 4;
}
dst->sender_key_id = keypair ? dev->InsertInKeyIdLookup(peer, keypair) : 0;
WG_ACQUIRE_LOCK(peer->mutex_);
peer->rx_bytes_ += packet->size;
if (keypair != NULL) {
// The server side needs to remember the endpoint on incoming handshakes.
if (peer->allow_endpoint_change_ && keypair->enabled_features[WG_FEATURE_HYBRID_TCP]) {
peer->endpoint_ = packet->addr;
peer->endpoint_protocol_ = packet->protocol;
}
peer->InsertKeypairInPeer_Locked(keypair);
peer->OnHandshakeAuthComplete();
}
packet->size = (unsigned)(sizeof(MessageHandshakeResponse) + extfield_out_size);
peer->tx_bytes_ += packet->size;
WG_RELEASE_LOCK(peer->mutex_);
// msg.empty := AEAD(K, 0, "", Hr)
chacha20poly1305_encrypt(dst->empty_enc, dst->empty_enc, extfield_out_size, hi, sizeof(hi), 0, k);
// Hr := HASH(Hr || "")
//BlakeMix(hi, dst->empty_enc, extfield_out_size);
dst->type = MESSAGE_HANDSHAKE_RESPONSE;
peer->WriteMacToPacket((uint8*)dst, (MessageMacs*)((uint8*)&dst->mac + extfield_out_size));
} else {
getout:
delete keypair;
peer = NULL;
}
memzero_crypto(hi, sizeof(hi));
memzero_crypto(ci, sizeof(ci));
memzero_crypto(k, sizeof(k));
memzero_crypto(t, sizeof(t));
return peer;
}
WgPeer *WgPeer::ParseMessageHandshakeResponse(WgDevice *dev, const Packet *packet) {
assert(dev->IsMainThread());
MessageHandshakeResponse *src = (MessageHandshakeResponse *)packet->data;
uint8 t[WG_HASH_LEN];
uint8 k[WG_SYMMETRIC_KEY_LEN];
WgKeypair *keypair;
auto peer_and_keypair = dev->LookupPeerInKeyIdLookup(src->receiver_key_id);
if (peer_and_keypair == NULL)
return NULL;
WgPeer *peer = peer_and_keypair->first;
assert(src->receiver_key_id == peer->local_key_id_during_hs_);
HandshakeState hs = peer->hs_;
// Hr := HASH(Hr || msg.ephemeral)
BlakeMix(hs.hi, src->ephemeral, sizeof(src->ephemeral));
// Ci := KDF_1(Ci, msg.ephemeral)
blake2s_hkdf(hs.ci, sizeof(hs.ci), NULL, 32, NULL, 32, src->ephemeral, sizeof(src->ephemeral), hs.ci, sizeof(hs.ci));
// Ci : = KDF2(Ci, DH(epriv, epub))
ComputeHKDF2DH(hs.ci, NULL, hs.e_priv, src->ephemeral);
// Ci : = KDF2(Ci, DH(spriv, epub))
ComputeHKDF2DH(hs.ci, NULL, peer->dev_->s_priv_, src->ephemeral);
// (Ci, T, K) := KDF3(Ci, Q)
blake2s_hkdf(hs.ci, sizeof(hs.ci), t, sizeof(t), k, sizeof(k), peer->preshared_key_, sizeof(peer->preshared_key_), hs.ci, sizeof(hs.ci));
// Hr := HASH(Hr || T)
BlakeMix(hs.hi, t, sizeof(t));
int extfield_size = packet->size - sizeof(MessageHandshakeResponse);
if ((uint32)extfield_size > MAX_SIZE_OF_HANDSHAKE_EXTENSION)
goto getout;
// "" := AEAD_DEC(K, 0, msg.empty, Hr)
if (!chacha20poly1305_decrypt(src->empty_enc, src->empty_enc, extfield_size + sizeof(src->empty_enc), hs.hi, sizeof(hs.hi), 0, k))
goto getout;
keypair = WgPeer::CreateNewKeypair(true, hs.ci, src->sender_key_id);
if (!keypair)
goto getout;
if (WITH_HANDSHAKE_EXT && !peer->ParseExtendedHandshake(keypair, src->empty_enc, extfield_size)) {
delete keypair;
goto getout;
}
// Allow plugin to determine what to do with the packet,
// it can append new headers to the response, and decide what to do.
if (WITH_HANDSHAKE_EXT && dev->plugin_) {
uint32 rv = dev->plugin_->OnHandshake2(peer, src->empty_enc, extfield_size, src->ephemeral);
if (rv & WgPlugin::kHandshakeResponseFail) {
delete keypair;
goto getout;
}
}
// Re-map the entry in the id table so it points at this keypair instead.
keypair->local_key_id = peer->local_key_id_during_hs_;
peer->local_key_id_during_hs_ = 0;
peer_and_keypair->second = keypair;
WG_ACQUIRE_LOCK(peer->mutex_);
if (peer->allow_endpoint_change_) {
// TODO: Why is this needed, if we are able to get a response for the handshake init
// packet then we already know its endpoint?
peer->endpoint_protocol_ = packet->protocol;
peer->endpoint_ = packet->addr;
if (!keypair->enabled_features[WG_FEATURE_HYBRID_TCP] || !peer->IsTransientDataEndpointActive()) {
peer->data_endpoint_protocol_ = peer->endpoint_protocol_;
peer->data_endpoint_ = peer->endpoint_;
}
// If hybrid tcp mode was enabled for the connection, switch
// the data endpoint to the udp endpoint.
} else if (peer->endpoint_protocol_ == kPacketProtocolTcp) {
peer->data_endpoint_protocol_ = keypair->enabled_features[WG_FEATURE_HYBRID_TCP] ? kPacketProtocolUdp : kPacketProtocolTcp;
peer->data_endpoint_ = peer->endpoint_;
}
WG_EXTENSION_HOOKS::OnPeerIncomingUdp(peer, packet, packet->size);
peer->rx_bytes_ += packet->size;
peer->InsertKeypairInPeer_Locked(keypair);
WG_RELEASE_LOCK(peer->mutex_);
if (0) {
getout:
peer = NULL;
}
memzero_crypto(t, sizeof(t));
memzero_crypto(k, sizeof(k));
memzero_crypto(&hs, sizeof(hs));
return peer;
}
// This is parsed by the initiator, when it needs to re-send the handshake message with a better mac.
void WgPeer::ParseMessageHandshakeCookie(WgDevice *dev, const MessageHandshakeCookie *src) {
assert(dev->IsMainThread());
uint8 cookie[WG_COOKIE_LEN];
auto peer_and_keypair = dev->LookupPeerInKeyIdLookup(src->receiver_key_id);
if (!peer_and_keypair)
return;
WgPeer *peer = peer_and_keypair->first;
if (!peer->expect_cookie_reply_)
return;
if (!xchacha20poly1305_decrypt(cookie, src->cookie_enc, sizeof(src->cookie_enc),
peer->sent_mac1_, sizeof(peer->sent_mac1_), src->nonce, peer->precomputed_cookie_key_))
return;
WG_ACQUIRE_LOCK(peer->mutex_);
peer->rx_bytes_ += sizeof(MessageHandshakeCookie);
WG_RELEASE_LOCK(peer->mutex_);
peer->expect_cookie_reply_ = false;
peer->has_mac2_cookie_ = true;
peer->mac2_cookie_timestamp_ = OsGetMilliseconds();
memcpy(peer->mac2_cookie_, cookie, sizeof(peer->mac2_cookie_));
}
int WgPeer::WriteHandshakeExtension(uint8 *dst, WgKeypair *keypair) {
uint8 *dst_org = dst, *dst_end = dst + MAX_SIZE_OF_HANDSHAKE_EXTENSION;
if (WITH_HANDSHAKE_EXT) {
if (WITH_BOOLEAN_FEATURES) {
uint8 value = 0;
// Include the supported features extension
if (!IsOnlyZeros(features_, sizeof(features_))) {
*dst++ = kExtensionType_Booleans;
*dst++ = (WG_FEATURES_COUNT + 3) >> 2;
for (size_t i = 0; i != WG_FEATURES_COUNT; i++) {
if ((i & 3) == 0)
value = 0;
dst[i >> 2] = (value += (features_[i] << ((i * 2) & 7)));
}
// swap WG_FEATURE_ID_SKIP_KEYID_IN and WG_FEATURE_ID_SKIP_KEYID_OUT
dst[1] = (dst[1] & 0xF0) + ((dst[1] >> 2) & 0x03) + ((dst[1] << 2) & 0x0C);
dst += (WG_FEATURES_COUNT + 3) >> 2;
}
}
if (WITH_CIPHER_SUITES) {
// Ordered list of cipher suites
size_t ciphers = num_ciphers_;
if (ciphers) {
*dst++ = kExtensionType_CipherSuites + cipher_prio_;
if (keypair) {
*dst++ = 1;
*dst++ = keypair->cipher_suite;
} else {
*dst++ = (uint8)ciphers;
memcpy(dst, ciphers_, ciphers);
dst += ciphers;
}
}
}
}
return (int)(dst - dst_org);
}
static bool ResolveBooleanFeatureValue(uint8 other, uint8 self, bool *result) {
uint8 both = other * 4 + self;
*result = (0xfec0 >> both) & 1;
return (0xeff7 >> both) & 1;
}
static const uint8 cipher_strengths[EXT_CIPHER_SUITE_COUNT] = {4,2,3,1};
static uint32 ResolveCipherSuite(int tie, const uint8 *a, size_t a_size, const uint8 *b, size_t b_size) {
uint32 abits[8] = {0}, bbits[8] = {0}, found_a = 0, found_b = 0;
for (size_t i = 0; i < a_size; i++)
abits[a[i] >> 5] |= 1 << (a[i] & 31);
for (size_t i = 0; i < b_size; i++)
bbits[b[i] >> 5] |= 1 << (b[i] & 31);
for (size_t i = 0; i < a_size; i++)
if (bbits[a[i] >> 5] & (1 << (a[i] & 31))) {
found_a = a[i];
break;
}
for (size_t i = 0; i < b_size; i++)
if (abits[b[i] >> 5] & (1 << (b[i] & 31))) {
found_b = b[i];
break;
}
return (tie > 0 ||
(tie == 0 && cipher_strengths[found_a] > cipher_strengths[found_b])) ? found_a : found_b;
}
static void WgKeypairDelayedDelete(void *x) {
WgKeypair *t = (WgKeypair*)x;
if (t->aes_gcm128_context_)
free(t->aes_gcm128_context_);
delete t;
}
void WgPeer::DeleteKeypair(WgKeypair **kp) {
WgKeypair *t = *kp;
*kp = NULL;
if (t) {
assert(t->peer->IsPeerLocked());
WgDevice *dev = t->peer->dev_;
if (t->addr_entry) {
WG_SCOPED_RWLOCK_EXCLUSIVE(dev->addr_entry_lookup_lock_);
dev->EraseKeypairAddrEntry_Locked(t);
}
if (t->local_key_id) {
WG_SCOPED_RWLOCK_EXCLUSIVE(dev->key_id_lookup_lock_);
dev->key_id_lookup_.erase(t->local_key_id);
t->local_key_id = 0;
}
t->recv_key_state = WgKeypair::KEY_INVALID;
dev->delayed_delete_.Add(&WgKeypairDelayedDelete, t);
}
}
bool WgPeer::ParseExtendedHandshake(WgKeypair *kp, const uint8 *data, size_t data_size) {
// Empty handshake is always OK
if (data_size == 0)
return true;
// The first four bytes contain a client ID and major, minor version
if (data_size < 4 || (ReadLE32(data) & 0xFFFFFF) != kTunsafeExtensionClientID)
return false;
data += 4, data_size -= 4;
while (data_size >= 2) {
uint8 type = data[0], size = data[1];
data += 2, data_size -= 2;
if (size > data_size)
return false;
switch (type) {
case kExtensionType_CipherSuitesPrio:
case kExtensionType_CipherSuites:
if (WITH_CIPHER_SUITES) {
kp->cipher_suite = ResolveCipherSuite(cipher_prio_ - (type - kExtensionType_CipherSuites),
ciphers_, num_ciphers_, data, size);
}
break;
case kExtensionType_Booleans:
if (WITH_BOOLEAN_FEATURES) {
for (uint32 i = 0, j = std::max<uint32>(WG_FEATURES_COUNT, size * 4); i != j; i++) {
uint8 value = (i < (uint32)size * 4) ? (data[i >> 2] >> ((i * 2) & 7)) & 3 : 0;
if (i >= WG_FEATURES_COUNT ? (value == WG_BOOLEAN_FEATURE_ENFORCES) :
!ResolveBooleanFeatureValue(value, features_[i], &kp->enabled_features[i]))
return false;
}
}
break;
}
data += size, data_size -= size;
}
if (data_size != 0)
return false;
if (WITH_BOOLEAN_FEATURES && WITH_SHORT_MAC)
kp->auth_tag_length = (kp->enabled_features[WG_FEATURE_ID_SHORT_MAC] ? 8 : CHACHA20POLY1305_AUTHTAGLEN);
if (WITH_CIPHER_SUITES && kp->cipher_suite >= EXT_CIPHER_SUITE_AES128_GCM && kp->cipher_suite <= EXT_CIPHER_SUITE_AES256_GCM) {
#if WITH_AESGCM
kp->aes_gcm128_context_ = (AesGcm128StaticContext *)malloc(sizeof(*kp->aes_gcm128_context_) * 2);
if (!kp->aes_gcm128_context_)
return false;
int key_size = (kp->cipher_suite == EXT_CIPHER_SUITE_AES128_GCM) ? 128 : 256;
CRYPTO_gcm128_init(&kp->aes_gcm128_context_[0], kp->send_key, key_size);
CRYPTO_gcm128_init(&kp->aes_gcm128_context_[1], kp->recv_key, key_size);
#else // WITH_AESGCM
return false;
#endif // WITH_AESGCM
}
return true;
}
WgKeypair *WgPeer::CreateNewKeypair(bool is_initiator, const uint8 chaining_key[WG_HASH_LEN], uint32 remote_key_id) {
WgKeypair *kp = new WgKeypair;