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711 lines
25 KiB
C++
711 lines
25 KiB
C++
#include <openssl/rand.h>
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#include <openssl/sha.h>
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#include <openssl/hmac.h>
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#include <stdlib.h>
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#include <vector>
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#include "Log.h"
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#include "I2PEndian.h"
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#include "Crypto.h"
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#include "Ed25519.h"
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#include "Siphash.h"
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#include "RouterContext.h"
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#include "NTCP2.h"
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namespace i2p
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{
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namespace transport
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{
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NTCP2Establisher::NTCP2Establisher ()
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{
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m_Ctx = BN_CTX_new ();
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CreateEphemeralKey ();
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}
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NTCP2Establisher::~NTCP2Establisher ()
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{
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BN_CTX_free (m_Ctx);
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}
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void NTCP2Establisher::MixKey (const uint8_t * inputKeyMaterial, uint8_t * derived)
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{
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// temp_key = HMAC-SHA256(ck, input_key_material)
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uint8_t tempKey[32]; unsigned int len;
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HMAC(EVP_sha256(), m_CK, 32, inputKeyMaterial, 32, tempKey, &len);
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// ck = HMAC-SHA256(temp_key, byte(0x01))
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static uint8_t one[1] = { 1 };
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HMAC(EVP_sha256(), tempKey, 32, one, 1, m_CK, &len);
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// derived = HMAC-SHA256(temp_key, ck || byte(0x02))
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m_CK[32] = 2;
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HMAC(EVP_sha256(), tempKey, 32, m_CK, 33, derived, &len);
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}
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void NTCP2Establisher::KeyDerivationFunction1 (const uint8_t * rs, const uint8_t * priv, const uint8_t * pub)
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{
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static const uint8_t protocolNameHash[] =
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{
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0x72, 0xe8, 0x42, 0xc5, 0x45, 0xe1, 0x80, 0x80, 0xd3, 0x9c, 0x44, 0x93, 0xbb, 0x91, 0xd7, 0xed,
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0xf2, 0x28, 0x98, 0x17, 0x71, 0x21, 0x8c, 0x1f, 0x62, 0x4e, 0x20, 0x6f, 0x28, 0xd3, 0x2f, 0x71
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}; // SHA256 ("Noise_XKaesobfse+hs2+hs3_25519_ChaChaPoly_SHA256")
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static uint8_t h[64] =
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{
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0x49, 0xff, 0x48, 0x3f, 0xc4, 0x04, 0xb9, 0xb2, 0x6b, 0x11, 0x94, 0x36, 0x72, 0xff, 0x05, 0xb5,
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0x61, 0x27, 0x03, 0x31, 0xba, 0x89, 0xb8, 0xfc, 0x33, 0x15, 0x93, 0x87, 0x57, 0xdd, 0x3d, 0x1e
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}; // SHA256 (protocolNameHash)
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memcpy (m_CK, protocolNameHash, 32);
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// h = SHA256(h || rs)
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memcpy (h + 32, rs, 32);
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SHA256 (h, 64, h);
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// h = SHA256(h || pub)
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memcpy (h + 32, pub, 32);
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SHA256 (h, 64, m_H);
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// x25519 between rs and priv
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uint8_t inputKeyMaterial[32];
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i2p::crypto::GetEd25519 ()->ScalarMul (rs, priv, inputKeyMaterial, m_Ctx); // rs*priv
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MixKey (inputKeyMaterial, m_K);
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}
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void NTCP2Establisher::KDF1Alice ()
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{
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KeyDerivationFunction1 (m_RemoteStaticKey, GetPriv (), GetPub ());
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}
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void NTCP2Establisher::KDF1Bob ()
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{
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KeyDerivationFunction1 (GetRemotePub (), i2p::context.GetNTCP2StaticPrivateKey (), GetRemotePub ());
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}
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void NTCP2Establisher::KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen)
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{
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uint8_t h[64];
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memcpy (h, m_H, 32);
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memcpy (h + 32, sessionRequest + 32, 32); // encrypted payload
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SHA256 (h, 64, h);
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int paddingLength = sessionRequestLen - 64;
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if (paddingLength > 0)
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{
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SHA256_CTX ctx;
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SHA256_Init (&ctx);
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SHA256_Update (&ctx, h, 32);
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SHA256_Update (&ctx, sessionRequest + 64, paddingLength);
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SHA256_Final (h, &ctx);
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}
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memcpy (h + 32, GetRemotePub (), 32);
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SHA256 (h, 64, m_H);
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// x25519 between remote pub and priv
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uint8_t inputKeyMaterial[32];
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i2p::crypto::GetEd25519 ()->ScalarMul (GetRemotePub (), GetPriv (), inputKeyMaterial, m_Ctx);
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MixKey (inputKeyMaterial, m_K);
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}
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void NTCP2Establisher::KDF3Alice ()
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{
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uint8_t inputKeyMaterial[32];
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i2p::crypto::GetEd25519 ()->ScalarMul (GetRemotePub (), i2p::context.GetNTCP2StaticPrivateKey (), inputKeyMaterial, m_Ctx);
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MixKey (inputKeyMaterial, m_K);
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}
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void NTCP2Establisher::KDF3Bob ()
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{
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uint8_t inputKeyMaterial[32];
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i2p::crypto::GetEd25519 ()->ScalarMul (m_RemoteStaticKey, m_EphemeralPrivateKey, inputKeyMaterial, m_Ctx);
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MixKey (inputKeyMaterial, m_K);
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}
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void NTCP2Establisher::CreateEphemeralKey ()
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{
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RAND_bytes (m_EphemeralPrivateKey, 32);
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i2p::crypto::GetEd25519 ()->ScalarMulB (m_EphemeralPrivateKey, m_EphemeralPublicKey, m_Ctx);
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}
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NTCP2Session::NTCP2Session (NTCP2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter):
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TransportSession (in_RemoteRouter, 30),
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m_Server (server), m_Socket (m_Server.GetService ()),
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m_IsEstablished (false), m_IsTerminated (false),
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m_SessionRequestBuffer (nullptr), m_SessionCreatedBuffer (nullptr), m_SessionConfirmedBuffer (nullptr),
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m_NextReceivedBuffer (nullptr), m_NextSendBuffer (nullptr),
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m_ReceiveSequenceNumber (0), m_SendSequenceNumber (0)
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{
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m_Establisher.reset (new NTCP2Establisher);
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auto addr = in_RemoteRouter->GetNTCPAddress ();
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if (addr->ntcp2)
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{
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memcpy (m_Establisher->m_RemoteStaticKey, addr->ntcp2->staticKey, 32);
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memcpy (m_Establisher->m_IV, addr->ntcp2->iv, 16);
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}
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else
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LogPrint (eLogWarning, "NTCP2: Missing NTCP2 parameters");
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}
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NTCP2Session::~NTCP2Session ()
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{
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delete[] m_SessionRequestBuffer;
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delete[] m_SessionCreatedBuffer;
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delete[] m_SessionConfirmedBuffer;
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delete[] m_NextReceivedBuffer;
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delete[] m_NextSendBuffer;
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}
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void NTCP2Session::Terminate ()
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{
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if (!m_IsTerminated)
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{
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m_IsTerminated = true;
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m_IsEstablished = false;
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m_Socket.close ();
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LogPrint (eLogDebug, "NTCP2: session terminated");
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}
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}
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void NTCP2Session::Done ()
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{
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m_Server.GetService ().post (std::bind (&NTCP2Session::Terminate, shared_from_this ()));
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}
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void NTCP2Session::CreateNonce (uint64_t seqn, uint8_t * nonce)
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{
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memset (nonce, 0, 4);
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htole64buf (nonce + 4, seqn);
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}
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void NTCP2Session::KeyDerivationFunctionDataPhase ()
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{
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uint8_t tempKey[32]; unsigned int len;
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HMAC(EVP_sha256(), m_Establisher->GetCK (), 32, nullptr, 0, tempKey, &len); // temp_key = HMAC-SHA256(ck, zerolen)
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static uint8_t one[1] = { 1 };
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HMAC(EVP_sha256(), tempKey, 32, one, 1, m_Kab, &len); // k_ab = HMAC-SHA256(temp_key, byte(0x01)).
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m_Kab[32] = 2;
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HMAC(EVP_sha256(), tempKey, 32, m_Kab, 33, m_Kba, &len); // k_ba = HMAC-SHA256(temp_key, k_ab || byte(0x02))
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static uint8_t ask[4] = { 'a', 's', 'k', 1 }, master[32];
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HMAC(EVP_sha256(), tempKey, 32, ask, 4, master, &len); // ask_master = HMAC-SHA256(temp_key, "ask" || byte(0x01))
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uint8_t h[39];
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memcpy (h, m_Establisher->GetH (), 32);
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memcpy (h + 32, "siphash", 7);
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HMAC(EVP_sha256(), master, 32, h, 39, tempKey, &len); // temp_key = HMAC-SHA256(ask_master, h || "siphash")
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HMAC(EVP_sha256(), tempKey, 32, one, 1, master, &len); // sip_master = HMAC-SHA256(temp_key, byte(0x01))
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HMAC(EVP_sha256(), master, 32, nullptr, 0, tempKey, &len); // temp_key = HMAC-SHA256(sip_master, zerolen)
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HMAC(EVP_sha256(), tempKey, 32, one, 1, m_Sipkeysab, &len); // sipkeys_ab = HMAC-SHA256(temp_key, byte(0x01)).
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m_Sipkeysab[32] = 2;
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HMAC(EVP_sha256(), tempKey, 32, m_Sipkeysab, 33, m_Sipkeysba, &len); // sipkeys_ba = HMAC-SHA256(temp_key, sipkeys_ab || byte(0x02))
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}
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void NTCP2Session::SendSessionRequest ()
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{
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// create buffer and fill padding
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auto paddingLength = rand () % (287 - 64); // message length doesn't exceed 287 bytes
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m_SessionRequestBufferLen = paddingLength + 64;
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m_SessionRequestBuffer = new uint8_t[m_SessionRequestBufferLen];
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RAND_bytes (m_SessionRequestBuffer + 64, paddingLength);
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// encrypt X
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i2p::crypto::CBCEncryption encryption;
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encryption.SetKey (GetRemoteIdentity ()->GetIdentHash ());
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encryption.SetIV (m_Establisher->m_IV);
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encryption.Encrypt (m_Establisher->GetPub (), 32, m_SessionRequestBuffer); // X
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encryption.GetIV (m_Establisher->m_IV); // save IV for SessionCreated
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// encryption key for next block
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m_Establisher->KDF1Alice ();
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// fill options
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uint8_t options[32]; // actual options size is 16 bytes
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memset (options, 0, 16);
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options[1] = 2; // ver
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htobe16buf (options + 2, paddingLength); // padLen
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m_Establisher->m3p2Len = i2p::context.GetRouterInfo ().GetBufferLen () + 20; // (RI header + RI + MAC for now) TODO: implement options
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htobe16buf (options + 4, m_Establisher->m3p2Len);
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// 2 bytes reserved
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htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsA
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// 4 bytes reserved
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// sign and encrypt options, use m_H as AD
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uint8_t nonce[12];
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memset (nonce, 0, 12); // set nonce to zero
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i2p::crypto::AEADChaCha20Poly1305 (options, 16, m_Establisher->GetH (), 32, m_Establisher->GetK (), nonce, m_SessionRequestBuffer + 32, 32, true); // encrypt
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// send message
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boost::asio::async_write (m_Socket, boost::asio::buffer (m_SessionRequestBuffer, m_SessionRequestBufferLen), boost::asio::transfer_all (),
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std::bind(&NTCP2Session::HandleSessionRequestSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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void NTCP2Session::HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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(void) bytes_transferred;
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if (ecode)
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{
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LogPrint (eLogWarning, "NTCP2: couldn't send SessionRequest message: ", ecode.message ());
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Terminate ();
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}
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else
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{
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m_SessionCreatedBuffer = new uint8_t[287]; // TODO: determine actual max size
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// we receive first 64 bytes (32 Y, and 32 ChaCha/Poly frame) first
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boost::asio::async_read (m_Socket, boost::asio::buffer(m_SessionCreatedBuffer, 64), boost::asio::transfer_all (),
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std::bind(&NTCP2Session::HandleSessionCreatedReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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}
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void NTCP2Session::HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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(void) bytes_transferred;
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if (ecode)
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{
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LogPrint (eLogWarning, "NTCP2: SessionRequest read error: ", ecode.message ());
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Terminate ();
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}
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else
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{
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// decrypt X
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i2p::crypto::CBCDecryption decryption;
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decryption.SetKey (i2p::context.GetIdentHash ());
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decryption.SetIV (i2p::context.GetNTCP2IV ());
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decryption.Decrypt (m_SessionRequestBuffer, 32, m_Establisher->GetRemotePub ());
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decryption.GetIV (m_Establisher->m_IV); // save IV for SessionCreated
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// decryption key for next block
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m_Establisher->KDF1Bob ();
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// verify MAC and decrypt options block (32 bytes), use m_H as AD
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uint8_t nonce[12], options[16];
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memset (nonce, 0, 12); // set nonce to zero
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if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionRequestBuffer + 32, 16, m_Establisher->GetH (), 32, m_Establisher->GetK (), nonce, options, 16, false)) // decrypt
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{
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if (options[1] == 2)
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{
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uint16_t paddingLen = bufbe16toh (options + 2);
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m_SessionRequestBufferLen = paddingLen + 64;
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m_Establisher->m3p2Len = bufbe16toh (options + 4);
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// TODO: check tsA
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if (paddingLen > 0)
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boost::asio::async_read (m_Socket, boost::asio::buffer(m_SessionRequestBuffer + 64, paddingLen), boost::asio::transfer_all (),
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std::bind(&NTCP2Session::HandleSessionRequestPaddingReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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else
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SendSessionCreated ();
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}
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else
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{
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LogPrint (eLogWarning, "NTCP2: SessionRequest version mismatch ", (int)options[1]);
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Terminate ();
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}
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}
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else
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{
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LogPrint (eLogWarning, "NTCP2: SessionRequest AEAD verification failed ");
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Terminate ();
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}
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}
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}
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void NTCP2Session::HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint (eLogWarning, "NTCP2: SessionRequest padding read error: ", ecode.message ());
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Terminate ();
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}
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else
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SendSessionCreated ();
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}
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void NTCP2Session::SendSessionCreated ()
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{
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m_SessionCreatedBuffer = new uint8_t[287]; // TODO: determine actual max size
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// encrypt Y
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i2p::crypto::CBCEncryption encryption;
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encryption.SetKey (i2p::context.GetIdentHash ());
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encryption.SetIV (m_Establisher->m_IV);
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encryption.Encrypt (m_Establisher->GetPub (), 32, m_SessionCreatedBuffer); // Y
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// encryption key for next block (m_K)
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m_Establisher->KeyDerivationFunction2 (m_SessionRequestBuffer, m_SessionRequestBufferLen);
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auto paddingLen = rand () % (287 - 64);
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uint8_t options[16];
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memset (options, 0, 16);
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htobe16buf (options + 2, paddingLen); // padLen
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htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsB
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// sign and encrypt options, use m_H as AD
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uint8_t nonce[12];
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memset (nonce, 0, 12); // set nonce to zero
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i2p::crypto::AEADChaCha20Poly1305 (options, 16, m_Establisher->GetH (), 32, m_Establisher->GetK (), nonce, m_SessionCreatedBuffer + 32, 32, true); // encrypt
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// fill padding
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RAND_bytes (m_SessionCreatedBuffer + 56, paddingLen);
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// send message
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m_SessionCreatedBufferLen = paddingLen + 64;
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boost::asio::async_write (m_Socket, boost::asio::buffer (m_SessionCreatedBuffer, m_SessionCreatedBufferLen), boost::asio::transfer_all (),
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std::bind(&NTCP2Session::HandleSessionCreatedSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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void NTCP2Session::HandleSessionCreatedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint (eLogWarning, "NTCP2: SessionCreated read error: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint (eLogDebug, "NTCP2: SessionCreated received ", bytes_transferred);
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m_SessionCreatedBufferLen = 64;
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// decrypt Y
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i2p::crypto::CBCDecryption decryption;
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decryption.SetKey (GetRemoteIdentity ()->GetIdentHash ());
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decryption.SetIV (m_Establisher->m_IV);
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decryption.Decrypt (m_SessionCreatedBuffer, 32, m_Establisher->GetRemotePub ());
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// decryption key for next block (m_K)
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m_Establisher->KeyDerivationFunction2 (m_SessionRequestBuffer, m_SessionRequestBufferLen);
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// decrypt and verify MAC
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uint8_t payload[16];
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uint8_t nonce[12];
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memset (nonce, 0, 12); // set nonce to zero
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if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionCreatedBuffer + 32, 16, m_Establisher->GetH (), 32, m_Establisher->GetK (), nonce, payload, 16, false)) // decrypt
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{
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uint16_t paddingLen = bufbe16toh(payload + 2);
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LogPrint (eLogDebug, "NTCP2: padding length ", paddingLen);
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// TODO: check tsB
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if (paddingLen > 0)
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{
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boost::asio::async_read (m_Socket, boost::asio::buffer(m_SessionCreatedBuffer + 64, paddingLen), boost::asio::transfer_all (),
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std::bind(&NTCP2Session::HandleSessionCreatedPaddingReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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else
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SendSessionConfirmed ();
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}
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else
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{
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LogPrint (eLogWarning, "NTCP2: SessionCreated MAC verification failed ");
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Terminate ();
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}
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}
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}
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void NTCP2Session::HandleSessionCreatedPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint (eLogWarning, "NTCP2: SessionCreated padding read error: ", ecode.message ());
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Terminate ();
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}
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else
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{
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m_SessionCreatedBufferLen += bytes_transferred;
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SendSessionConfirmed ();
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}
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}
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void NTCP2Session::SendSessionConfirmed ()
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{
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// update AD
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uint8_t h[80];
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memcpy (h, m_Establisher->GetH (), 32);
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memcpy (h + 32, m_SessionCreatedBuffer + 32, 32); // encrypted payload
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SHA256 (h, 64, h);
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int paddingLength = m_SessionCreatedBufferLen - 64;
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if (paddingLength > 0)
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{
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SHA256_CTX ctx;
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SHA256_Init (&ctx);
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SHA256_Update (&ctx, h, 32);
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SHA256_Update (&ctx, m_SessionCreatedBuffer + 64, paddingLength);
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SHA256_Final (h, &ctx);
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}
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// part1 48 bytes
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m_SessionConfirmedBuffer = new uint8_t[2048]; // TODO: actual size
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uint8_t nonce[12];
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CreateNonce (1, nonce);
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i2p::crypto::AEADChaCha20Poly1305 (i2p::context.GetNTCP2StaticPublicKey (), 32, h, 32, m_Establisher->GetK (), nonce, m_SessionConfirmedBuffer, 48, true); // encrypt
|
|
// part 2
|
|
// update AD again
|
|
memcpy (h + 32, m_SessionConfirmedBuffer, 48);
|
|
SHA256 (h, 80, m_Establisher->m_H);
|
|
|
|
std::vector<uint8_t> buf(m_Establisher->m3p2Len - 16); // -MAC
|
|
buf[0] = 2; // block
|
|
htobe16buf (buf.data () + 1, i2p::context.GetRouterInfo ().GetBufferLen () + 1); // flag + RI
|
|
buf[3] = 0; // flag
|
|
memcpy (buf.data () + 4, i2p::context.GetRouterInfo ().GetBuffer (), i2p::context.GetRouterInfo ().GetBufferLen ());
|
|
m_Establisher->KDF3Alice ();
|
|
memset (nonce, 0, 12); // set nonce to 0 again
|
|
i2p::crypto::AEADChaCha20Poly1305 (buf.data (), m_Establisher->m3p2Len - 16, m_Establisher->GetH (), 32, m_Establisher->GetK (), nonce, m_SessionConfirmedBuffer + 48, m_Establisher->m3p2Len, true); // encrypt
|
|
uint8_t tmp[48];
|
|
memcpy (tmp, m_SessionConfirmedBuffer, 48);
|
|
memcpy (m_SessionConfirmedBuffer + 16, m_Establisher->GetH (), 32); // h || ciphertext
|
|
SHA256 (m_SessionConfirmedBuffer + 16, m_Establisher->m3p2Len + 32, m_Establisher->m_H); //h = SHA256(h || ciphertext);
|
|
memcpy (m_SessionConfirmedBuffer, tmp, 48);
|
|
|
|
// send message
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (m_SessionConfirmedBuffer, m_Establisher->m3p2Len + 48), boost::asio::transfer_all (),
|
|
std::bind(&NTCP2Session::HandleSessionConfirmedSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCP2Session::HandleSessionConfirmedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
LogPrint (eLogDebug, "NTCP2: SessionConfirmed sent");
|
|
KeyDerivationFunctionDataPhase ();
|
|
// Alice
|
|
m_SendKey = m_Kab;
|
|
m_ReceiveKey = m_Kba;
|
|
m_SendSipKey = m_Sipkeysab;
|
|
m_ReceiveSipKey = m_Sipkeysba;
|
|
memcpy (m_ReceiveIV, m_Sipkeysba + 16, 8);
|
|
memcpy (m_SendIV, m_Sipkeysab + 16, 8);
|
|
ReceiveLength ();
|
|
|
|
// TODO: remove
|
|
uint8_t pad[1024];
|
|
auto paddingLength = rand () % 1000;
|
|
RAND_bytes (pad + 3, paddingLength);
|
|
pad[0] = 254;
|
|
htobe16buf (pad + 1, paddingLength);
|
|
SendNextFrame (pad, paddingLength + 3);
|
|
}
|
|
|
|
void NTCP2Session::HandleSessionCreatedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP2: couldn't send SessionCreated message: ", ecode.message ());
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogDebug, "NTCP2: SessionCreated sent");
|
|
m_SessionConfirmedBuffer = new uint8_t[m_Establisher->m3p2Len + 48];
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(m_SessionConfirmedBuffer, m_Establisher->m3p2Len + 48), boost::asio::transfer_all (),
|
|
std::bind(&NTCP2Session::HandleSessionConfirmedReceived , shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
}
|
|
|
|
void NTCP2Session::HandleSessionConfirmedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP2: SessionConfirmed Part 1 read error: ", ecode.message ());
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogDebug, "NTCP2: SessionConfirmed Part 1 received");
|
|
// update AD
|
|
uint8_t h[80];
|
|
memcpy (h, m_Establisher->GetH (), 32);
|
|
memcpy (h + 32, m_SessionCreatedBuffer + 32, 32); // encrypted payload
|
|
SHA256 (h, 64, h);
|
|
int paddingLength = m_SessionCreatedBufferLen - 64;
|
|
if (paddingLength > 0)
|
|
{
|
|
SHA256_CTX ctx;
|
|
SHA256_Init (&ctx);
|
|
SHA256_Update (&ctx, h, 32);
|
|
SHA256_Update (&ctx, m_SessionCreatedBuffer + 64, paddingLength);
|
|
SHA256_Final (h, &ctx);
|
|
}
|
|
// part 1
|
|
uint8_t nonce[12];
|
|
CreateNonce (1, nonce);
|
|
i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer, 48, h, 32, m_Establisher->GetK (), nonce, m_Establisher->m_RemoteStaticKey, 32, false); // decrypt S
|
|
// part 2
|
|
// update AD again
|
|
memcpy (h + 32, m_SessionConfirmedBuffer, 48);
|
|
SHA256 (h, 80, m_Establisher->m_H);
|
|
|
|
std::vector<uint8_t> buf(m_Establisher->m3p2Len - 16); // -MAC
|
|
m_Establisher->KDF3Bob ();
|
|
memset (nonce, 0, 12); // set nonce to 0 again
|
|
i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer + 48, m_Establisher->m3p2Len, m_Establisher->GetH (), 32, m_Establisher->GetK (), nonce, buf.data (), m_Establisher->m3p2Len - 16, false); // decrypt
|
|
// TODO: process RI and options
|
|
// caclulate new h again for KDF data
|
|
memcpy (m_SessionConfirmedBuffer + 16, m_Establisher->GetH (), 32); // h || ciphertext
|
|
SHA256 (m_SessionConfirmedBuffer + 16, m_Establisher->m3p2Len + 32, m_Establisher->m_H); //h = SHA256(h || ciphertext);
|
|
KeyDerivationFunctionDataPhase ();
|
|
// Bob
|
|
m_SendKey = m_Kba;
|
|
m_ReceiveKey = m_Kab;
|
|
m_SendSipKey = m_Sipkeysba;
|
|
m_ReceiveSipKey = m_Sipkeysab;
|
|
memcpy (m_ReceiveIV, m_Sipkeysab + 16, 8);
|
|
memcpy (m_SendIV, m_Sipkeysba + 16, 8);
|
|
ReceiveLength ();
|
|
}
|
|
}
|
|
|
|
void NTCP2Session::ClientLogin ()
|
|
{
|
|
SendSessionRequest ();
|
|
}
|
|
|
|
void NTCP2Session::ServerLogin ()
|
|
{
|
|
m_SessionRequestBuffer = new uint8_t[287]; // 287 bytes max for now
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(m_SessionRequestBuffer, 64), boost::asio::transfer_all (),
|
|
std::bind(&NTCP2Session::HandleSessionRequestReceived, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCP2Session::ReceiveLength ()
|
|
{
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(&m_NextReceivedLen, 2), boost::asio::transfer_all (),
|
|
std::bind(&NTCP2Session::HandleReceivedLength, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCP2Session::HandleReceivedLength (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP2: receive length read error: ", ecode.message ());
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
i2p::crypto::Siphash<8> (m_ReceiveIV, m_ReceiveIV, 8, m_ReceiveSipKey);
|
|
m_NextReceivedLen = be16toh (m_NextReceivedLen ^ bufbe16toh(m_ReceiveIV));
|
|
LogPrint (eLogDebug, "NTCP2: received length ", m_NextReceivedLen);
|
|
delete[] m_NextReceivedBuffer;
|
|
m_NextReceivedBuffer = new uint8_t[m_NextReceivedLen];
|
|
Receive ();
|
|
}
|
|
}
|
|
|
|
void NTCP2Session::Receive ()
|
|
{
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(m_NextReceivedBuffer, m_NextReceivedLen), boost::asio::transfer_all (),
|
|
std::bind(&NTCP2Session::HandleReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCP2Session::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP2: receive read error: ", ecode.message ());
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
uint8_t nonce[12];
|
|
CreateNonce (m_ReceiveSequenceNumber, nonce); m_ReceiveSequenceNumber++;
|
|
uint8_t * decrypted = new uint8_t[m_NextReceivedLen];
|
|
if (i2p::crypto::AEADChaCha20Poly1305 (m_NextReceivedBuffer, m_NextReceivedLen-16, nullptr, 0, m_ReceiveKey, nonce, decrypted, m_NextReceivedLen, false))
|
|
{
|
|
LogPrint (eLogInfo, "NTCP2: received message decrypted");
|
|
ProcessNextFrame (decrypted, m_NextReceivedLen-16);
|
|
ReceiveLength ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogWarning, "NTCP2: Received MAC verification failed ");
|
|
Terminate ();
|
|
}
|
|
delete[] decrypted;
|
|
}
|
|
}
|
|
|
|
void NTCP2Session::ProcessNextFrame (const uint8_t * frame, size_t len)
|
|
{
|
|
size_t offset = 0;
|
|
while (offset < len)
|
|
{
|
|
uint8_t blk = frame[offset];
|
|
offset++;
|
|
auto size = bufbe16toh (frame + offset);
|
|
offset += 2;
|
|
LogPrint (eLogDebug, "NTCP2: Block type ", (int)blk, " of size ", size);
|
|
if (size > len)
|
|
{
|
|
LogPrint (eLogError, "NTCP2: Unexpected block length ", size);
|
|
break;
|
|
}
|
|
offset += size;
|
|
}
|
|
}
|
|
|
|
void NTCP2Session::SendNextFrame (const uint8_t * payload, size_t len)
|
|
{
|
|
uint8_t nonce[12];
|
|
CreateNonce (m_SendSequenceNumber, nonce); m_SendSequenceNumber++;
|
|
m_NextSendBuffer = new uint8_t[len + 16 + 2];
|
|
i2p::crypto::AEADChaCha20Poly1305 (payload, len, nullptr, 0, m_SendKey, nonce, m_NextSendBuffer + 2, len + 16, true);
|
|
i2p::crypto::Siphash<8> (m_SendIV, m_SendIV, 8, m_SendSipKey);
|
|
htobuf16 (m_NextSendBuffer, bufbe16toh (m_SendIV) ^ htobe16(len + 16));
|
|
LogPrint (eLogDebug, "NTCP2: sent length ", len + 16);
|
|
|
|
// send message
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (m_NextSendBuffer, len + 16 + 2), boost::asio::transfer_all (),
|
|
std::bind(&NTCP2Session::HandleNextFrameSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCP2Session::HandleNextFrameSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
delete[] m_NextSendBuffer; m_NextSendBuffer = nullptr;
|
|
LogPrint (eLogDebug, "NTCP2: Next frame sent");
|
|
}
|
|
|
|
NTCP2Server::NTCP2Server ():
|
|
m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service)
|
|
{
|
|
}
|
|
|
|
NTCP2Server::~NTCP2Server ()
|
|
{
|
|
Stop ();
|
|
}
|
|
|
|
void NTCP2Server::Start ()
|
|
{
|
|
if (!m_IsRunning)
|
|
{
|
|
m_IsRunning = true;
|
|
m_Thread = new std::thread (std::bind (&NTCP2Server::Run, this));
|
|
}
|
|
}
|
|
|
|
void NTCP2Server::Stop ()
|
|
{
|
|
if (m_IsRunning)
|
|
{
|
|
m_IsRunning = false;
|
|
m_Service.stop ();
|
|
if (m_Thread)
|
|
{
|
|
m_Thread->join ();
|
|
delete m_Thread;
|
|
m_Thread = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
void NTCP2Server::Run ()
|
|
{
|
|
while (m_IsRunning)
|
|
{
|
|
try
|
|
{
|
|
m_Service.run ();
|
|
}
|
|
catch (std::exception& ex)
|
|
{
|
|
LogPrint (eLogError, "NTCP2: runtime exception: ", ex.what ());
|
|
}
|
|
}
|
|
}
|
|
|
|
void NTCP2Server::Connect(const boost::asio::ip::address & address, uint16_t port, std::shared_ptr<NTCP2Session> conn)
|
|
{
|
|
LogPrint (eLogDebug, "NTCP2: Connecting to ", address ,":", port);
|
|
m_Service.post([this, address, port, conn]()
|
|
{
|
|
conn->GetSocket ().async_connect (boost::asio::ip::tcp::endpoint (address, port), std::bind (&NTCP2Server::HandleConnect, this, std::placeholders::_1, conn));
|
|
});
|
|
}
|
|
|
|
void NTCP2Server::HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCP2Session> conn)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP2: Connect error ", ecode.message ());
|
|
conn->Terminate ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogDebug, "NTCP2: Connected to ", conn->GetSocket ().remote_endpoint ());
|
|
conn->ClientLogin ();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|