mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-10 00:00:29 +03:00
1070 lines
37 KiB
C++
1070 lines
37 KiB
C++
/*
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* Copyright (c) 2013-2024, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#include <string.h>
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#include "I2PEndian.h"
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#include "Crypto.h"
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#include "Log.h"
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#include "Tag.h"
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#include "Timestamp.h"
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#include "NetDb.hpp"
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#include "Tunnel.h"
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#include "LeaseSet.h"
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namespace i2p
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{
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namespace data
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{
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LeaseSet::LeaseSet (bool storeLeases):
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m_IsValid (false), m_StoreLeases (storeLeases), m_ExpirationTime (0), m_EncryptionKey (nullptr),
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m_Buffer (nullptr), m_BufferLen (0)
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{
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}
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LeaseSet::LeaseSet (const uint8_t * buf, size_t len, bool storeLeases):
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m_IsValid (true), m_StoreLeases (storeLeases), m_ExpirationTime (0), m_EncryptionKey (nullptr)
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{
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m_Buffer = new uint8_t[len];
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memcpy (m_Buffer, buf, len);
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m_BufferLen = len;
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ReadFromBuffer ();
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}
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void LeaseSet::Update (const uint8_t * buf, size_t len, bool verifySignature)
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{
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SetBuffer (buf, len);
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ReadFromBuffer (false, verifySignature);
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}
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void LeaseSet::PopulateLeases ()
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{
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m_StoreLeases = true;
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ReadFromBuffer (false);
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}
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void LeaseSet::ReadFromBuffer (bool readIdentity, bool verifySignature)
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{
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if (readIdentity || !m_Identity)
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m_Identity = netdb.NewIdentity (m_Buffer, m_BufferLen);
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size_t size = m_Identity->GetFullLen ();
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if (size + 256 > m_BufferLen)
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{
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LogPrint (eLogError, "LeaseSet: Identity length ", int(size), " exceeds buffer size ", int(m_BufferLen));
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m_IsValid = false;
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return;
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}
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if (m_StoreLeases)
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{
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if (!m_EncryptionKey) m_EncryptionKey = new uint8_t[256];
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memcpy (m_EncryptionKey, m_Buffer + size, 256);
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}
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size += 256; // encryption key
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size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
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if (size + 1 > m_BufferLen)
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{
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LogPrint (eLogError, "LeaseSet: ", int(size), " exceeds buffer size ", int(m_BufferLen));
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m_IsValid = false;
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return;
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}
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uint8_t num = m_Buffer[size];
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size++; // num
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LogPrint (eLogDebug, "LeaseSet: Read num=", (int)num);
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if (!num || num > MAX_NUM_LEASES)
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{
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LogPrint (eLogError, "LeaseSet: Incorrect number of leases", (int)num);
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m_IsValid = false;
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return;
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}
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if (size + num*LEASE_SIZE > m_BufferLen)
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{
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LogPrint (eLogError, "LeaseSet: ", int(size), " exceeds buffer size ", int(m_BufferLen));
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m_IsValid = false;
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return;
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}
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UpdateLeasesBegin ();
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// process leases
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m_ExpirationTime = 0;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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const uint8_t * leases = m_Buffer + size;
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for (int i = 0; i < num; i++)
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{
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Lease lease;
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lease.tunnelGateway = leases;
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leases += 32; // gateway
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lease.tunnelID = bufbe32toh (leases);
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leases += 4; // tunnel ID
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lease.endDate = bufbe64toh (leases);
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leases += 8; // end date
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UpdateLease (lease, ts);
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}
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if (!m_ExpirationTime)
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{
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LogPrint (eLogWarning, "LeaseSet: All leases are expired. Dropped");
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m_IsValid = false;
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return;
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}
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m_ExpirationTime += LEASE_ENDDATE_THRESHOLD;
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UpdateLeasesEnd ();
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// verify
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if (verifySignature)
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{
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auto signedSize = leases - m_Buffer;
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if (signedSize + m_Identity->GetSignatureLen () > m_BufferLen)
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{
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LogPrint (eLogError, "LeaseSet: Signature exceeds buffer size ", int(m_BufferLen));
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m_IsValid = false;
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}
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else if (!m_Identity->Verify (m_Buffer, signedSize, leases))
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{
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LogPrint (eLogWarning, "LeaseSet: Verification failed");
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m_IsValid = false;
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}
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}
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}
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void LeaseSet::UpdateLeasesBegin ()
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{
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// reset existing leases
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if (m_StoreLeases)
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for (auto& it: m_Leases)
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it->isUpdated = false;
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else
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m_Leases.clear ();
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}
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void LeaseSet::UpdateLeasesEnd ()
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{
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// delete old leases
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if (m_StoreLeases)
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{
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for (auto it = m_Leases.begin (); it != m_Leases.end ();)
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{
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if (!(*it)->isUpdated)
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{
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(*it)->endDate = 0; // somebody might still hold it
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m_Leases.erase (it++);
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}
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else
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++it;
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}
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}
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}
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void LeaseSet::UpdateLease (const Lease& lease, uint64_t ts)
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{
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if (ts < lease.endDate + LEASE_ENDDATE_THRESHOLD)
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{
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if (lease.endDate > m_ExpirationTime)
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m_ExpirationTime = lease.endDate;
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if (m_StoreLeases)
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{
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auto ret = m_Leases.insert (i2p::data::netdb.NewLease (lease));
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if (!ret.second) (*ret.first)->endDate = lease.endDate; // update existing
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(*ret.first)->isUpdated = true;
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}
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}
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else
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LogPrint (eLogWarning, "LeaseSet: Lease is expired already");
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}
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uint64_t LeaseSet::ExtractExpirationTimestamp (const uint8_t * buf, size_t len) const
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{
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if (!m_Identity) return 0;
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size_t size = m_Identity->GetFullLen ();
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if (size > len) return 0;
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size += 256; // encryption key
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size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
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if (size > len) return 0;
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uint8_t num = buf[size];
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size++; // num
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if (size + num*LEASE_SIZE > len) return 0;
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uint64_t timestamp= 0 ;
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for (int i = 0; i < num; i++)
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{
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size += 36; // gateway (32) + tunnelId(4)
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auto endDate = bufbe64toh (buf + size);
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size += 8; // end date
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if (!timestamp || endDate < timestamp)
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timestamp = endDate;
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}
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return timestamp;
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}
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bool LeaseSet::IsNewer (const uint8_t * buf, size_t len) const
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{
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return ExtractExpirationTimestamp (buf, len) > ExtractExpirationTimestamp (m_Buffer, m_BufferLen);
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}
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bool LeaseSet::ExpiresSoon(const uint64_t dlt, const uint64_t fudge) const
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{
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auto now = i2p::util::GetMillisecondsSinceEpoch ();
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if (fudge) now += rand() % fudge;
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if (now >= m_ExpirationTime) return true;
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return m_ExpirationTime - now <= dlt;
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}
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const std::vector<std::shared_ptr<const Lease> > LeaseSet::GetNonExpiredLeases (bool withThreshold) const
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{
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return GetNonExpiredLeasesExcluding( [] (const Lease & l) -> bool { return false; }, withThreshold);
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}
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const std::vector<std::shared_ptr<const Lease> > LeaseSet::GetNonExpiredLeasesExcluding (LeaseInspectFunc exclude, bool withThreshold) const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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std::vector<std::shared_ptr<const Lease> > leases;
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for (const auto& it: m_Leases)
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{
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auto endDate = it->endDate;
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if (withThreshold)
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endDate += LEASE_ENDDATE_THRESHOLD;
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else
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endDate -= LEASE_ENDDATE_THRESHOLD;
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if (ts < endDate && !exclude(*it))
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leases.push_back (it);
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}
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return leases;
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}
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bool LeaseSet::HasExpiredLeases () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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for (const auto& it: m_Leases)
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if (ts >= it->endDate) return true;
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return false;
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}
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bool LeaseSet::IsExpired () const
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{
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if (m_StoreLeases && IsEmpty ()) return true;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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return ts > m_ExpirationTime;
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}
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void LeaseSet::Encrypt (const uint8_t * data, uint8_t * encrypted) const
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{
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if (!m_EncryptionKey) return;
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auto encryptor = m_Identity->CreateEncryptor (m_EncryptionKey);
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if (encryptor)
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encryptor->Encrypt (data, encrypted);
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}
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void LeaseSet::SetBuffer (const uint8_t * buf, size_t len)
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{
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if (len > MAX_LS_BUFFER_SIZE)
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{
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LogPrint (eLogError, "LeaseSet: Buffer is too long ", len);
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len = MAX_LS_BUFFER_SIZE;
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}
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if (m_Buffer && len > m_BufferLen)
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{
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delete[] m_Buffer;
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m_Buffer = nullptr;
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}
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if (!m_Buffer)
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m_Buffer = new uint8_t[len];
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m_BufferLen = len;
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memcpy (m_Buffer, buf, len);
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}
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void LeaseSet::SetBufferLen (size_t len)
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{
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if (len <= m_BufferLen) m_BufferLen = len;
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else
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LogPrint (eLogError, "LeaseSet2: Actual buffer size ", int(len) , " exceeds full buffer size ", int(m_BufferLen));
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}
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LeaseSet2::LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases, CryptoKeyType preferredCrypto):
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LeaseSet (storeLeases), m_StoreType (storeType), m_EncryptionType (preferredCrypto)
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{
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SetBuffer (buf, len);
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if (storeType == NETDB_STORE_TYPE_ENCRYPTED_LEASESET2)
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ReadFromBufferEncrypted (buf, len, nullptr, nullptr);
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else
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ReadFromBuffer (buf, len);
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}
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LeaseSet2::LeaseSet2 (const uint8_t * buf, size_t len, std::shared_ptr<const BlindedPublicKey> key,
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const uint8_t * secret, CryptoKeyType preferredCrypto):
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LeaseSet (true), m_StoreType (NETDB_STORE_TYPE_ENCRYPTED_LEASESET2), m_EncryptionType (preferredCrypto)
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{
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ReadFromBufferEncrypted (buf, len, key, secret);
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}
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void LeaseSet2::Update (const uint8_t * buf, size_t len, bool verifySignature)
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{
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SetBuffer (buf, len);
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if (GetStoreType () != NETDB_STORE_TYPE_ENCRYPTED_LEASESET2)
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ReadFromBuffer (buf, len, false, verifySignature);
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// TODO: implement encrypted
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}
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bool LeaseSet2::IsNewer (const uint8_t * buf, size_t len) const
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{
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uint64_t expiration;
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return ExtractPublishedTimestamp (buf, len, expiration) > m_PublishedTimestamp;
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}
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void LeaseSet2::ReadFromBuffer (const uint8_t * buf, size_t len, bool readIdentity, bool verifySignature)
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{
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// standard LS2 header
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std::shared_ptr<const IdentityEx> identity;
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if (readIdentity || !GetIdentity ())
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{
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identity = netdb.NewIdentity (buf, len);
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SetIdentity (identity);
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}
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else
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identity = GetIdentity ();
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size_t offset = identity->GetFullLen ();
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if (offset + 8 > len) return;
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m_PublishedTimestamp = bufbe32toh (buf + offset); offset += 4; // published timestamp (seconds)
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uint16_t expires = bufbe16toh (buf + offset); offset += 2; // expires (seconds)
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SetExpirationTime ((m_PublishedTimestamp + expires)*1000LL); // in milliseconds
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uint16_t flags = bufbe16toh (buf + offset); offset += 2; // flags
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if (flags & LEASESET2_FLAG_OFFLINE_KEYS)
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{
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// transient key
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m_TransientVerifier = ProcessOfflineSignature (identity, buf, len, offset);
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if (!m_TransientVerifier)
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{
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LogPrint (eLogError, "LeaseSet2: Offline signature failed");
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return;
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}
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}
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if (flags & LEASESET2_FLAG_UNPUBLISHED_LEASESET) m_IsPublic = false;
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if (flags & LEASESET2_FLAG_PUBLISHED_ENCRYPTED)
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{
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m_IsPublishedEncrypted = true;
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m_IsPublic = true;
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}
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// type specific part
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size_t s = 0;
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switch (m_StoreType)
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{
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case NETDB_STORE_TYPE_STANDARD_LEASESET2:
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s = ReadStandardLS2TypeSpecificPart (buf + offset, len - offset);
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break;
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case NETDB_STORE_TYPE_META_LEASESET2:
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s = ReadMetaLS2TypeSpecificPart (buf + offset, len - offset);
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break;
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default:
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LogPrint (eLogWarning, "LeaseSet2: Unexpected store type ", (int)m_StoreType);
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}
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if (!s) return;
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offset += s;
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if (verifySignature || m_TransientVerifier)
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{
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// verify signature
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bool verified = m_TransientVerifier ? VerifySignature (m_TransientVerifier, buf, len, offset) :
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VerifySignature (identity, buf, len, offset);
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SetIsValid (verified);
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}
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else
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SetIsValid (true);
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offset += m_TransientVerifier ? m_TransientVerifier->GetSignatureLen () : identity->GetSignatureLen ();
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if (offset > len) {
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LogPrint (eLogWarning, "LeaseSet2: short buffer: wanted ", int(offset), "bytes, have ", int(len));
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return;
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}
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SetBufferLen (offset);
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}
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template<typename Verifier>
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bool LeaseSet2::VerifySignature (Verifier& verifier, const uint8_t * buf, size_t len, size_t signatureOffset)
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{
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if (signatureOffset + verifier->GetSignatureLen () > len) return false;
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// we assume buf inside DatabaseStore message, so buf[-1] is valid memory
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// change it for signature verification, and restore back
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uint8_t c = buf[-1];
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const_cast<uint8_t *>(buf)[-1] = m_StoreType;
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bool verified = verifier->Verify (buf - 1, signatureOffset + 1, buf + signatureOffset);
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const_cast<uint8_t *>(buf)[-1] = c;
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if (!verified)
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LogPrint (eLogWarning, "LeaseSet2: Verification failed");
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return verified;
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}
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size_t LeaseSet2::ReadStandardLS2TypeSpecificPart (const uint8_t * buf, size_t len)
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{
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size_t offset = 0;
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// properties
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uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
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offset += propertiesLen; // skip for now. TODO: implement properties
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// key sections
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CryptoKeyType preferredKeyType = m_EncryptionType;
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bool preferredKeyFound = false;
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if (offset + 1 > len) return 0;
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int numKeySections = buf[offset]; offset++;
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for (int i = 0; i < numKeySections; i++)
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{
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if (offset + 4 > len) return 0;
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uint16_t keyType = bufbe16toh (buf + offset); offset += 2; // encryption key type
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uint16_t encryptionKeyLen = bufbe16toh (buf + offset); offset += 2;
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if (offset + encryptionKeyLen > len) return 0;
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if (IsStoreLeases () && !preferredKeyFound) // create encryptor with leases only
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{
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// we pick first valid key if preferred not found
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auto encryptor = i2p::data::IdentityEx::CreateEncryptor (keyType, buf + offset);
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if (encryptor && (!m_Encryptor || keyType == preferredKeyType))
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{
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m_Encryptor = encryptor; // TODO: atomic
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m_EncryptionType = keyType;
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if (keyType == preferredKeyType) preferredKeyFound = true;
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}
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}
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offset += encryptionKeyLen;
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}
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// leases
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if (offset + 1 > len) return 0;
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int numLeases = buf[offset]; offset++;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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if (IsStoreLeases ())
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{
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UpdateLeasesBegin ();
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for (int i = 0; i < numLeases; i++)
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{
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if (offset + LEASE2_SIZE > len) return 0;
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Lease lease;
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lease.tunnelGateway = buf + offset; offset += 32; // gateway
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lease.tunnelID = bufbe32toh (buf + offset); offset += 4; // tunnel ID
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lease.endDate = bufbe32toh (buf + offset)*1000LL; offset += 4; // end date
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UpdateLease (lease, ts);
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}
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UpdateLeasesEnd ();
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}
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else
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offset += numLeases*LEASE2_SIZE; // 40 bytes per lease
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return (offset > len ? 0 : offset);
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}
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size_t LeaseSet2::ReadMetaLS2TypeSpecificPart (const uint8_t * buf, size_t len)
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{
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size_t offset = 0;
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// properties
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uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
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offset += propertiesLen; // skip for now. TODO: implement properties
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// entries
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if (offset + 1 > len) return 0;
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int numEntries = buf[offset]; offset++;
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for (int i = 0; i < numEntries; i++)
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{
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if (offset + LEASE2_SIZE > len) return 0;
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offset += 32; // hash
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offset += 3; // flags
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offset += 1; // cost
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offset += 4; // expires
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}
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// revocations
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if (offset + 1 > len) return 0;
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int numRevocations = buf[offset]; offset++;
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for (int i = 0; i < numRevocations; i++)
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{
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if (offset + 32 > len) return 0;
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offset += 32; // hash
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}
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return offset;
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}
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void LeaseSet2::ReadFromBufferEncrypted (const uint8_t * buf, size_t len, std::shared_ptr<const BlindedPublicKey> key, const uint8_t * secret)
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{
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size_t offset = 0;
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// blinded key
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if (len < 2) return;
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const uint8_t * stA1 = buf + offset; // stA1 = blinded signature type, 2 bytes big endian
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uint16_t blindedKeyType = bufbe16toh (stA1); offset += 2;
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std::unique_ptr<i2p::crypto::Verifier> blindedVerifier (i2p::data::IdentityEx::CreateVerifier (blindedKeyType));
|
|
if (!blindedVerifier) return;
|
|
auto blindedKeyLen = blindedVerifier->GetPublicKeyLen ();
|
|
if (offset + blindedKeyLen >= len) return;
|
|
const uint8_t * blindedPublicKey = buf + offset;
|
|
blindedVerifier->SetPublicKey (blindedPublicKey); offset += blindedKeyLen;
|
|
// expiration
|
|
if (offset + 8 >= len) return;
|
|
const uint8_t * publishedTimestamp = buf + offset;
|
|
m_PublishedTimestamp = bufbe32toh (publishedTimestamp); offset += 4; // published timestamp (seconds)
|
|
uint16_t expires = bufbe16toh (buf + offset); offset += 2; // expires (seconds)
|
|
SetExpirationTime ((m_PublishedTimestamp + expires)*1000LL); // in milliseconds
|
|
uint16_t flags = bufbe16toh (buf + offset); offset += 2; // flags
|
|
if (flags & LEASESET2_FLAG_OFFLINE_KEYS)
|
|
{
|
|
// transient key
|
|
m_TransientVerifier = ProcessOfflineSignature (blindedVerifier, buf, len, offset);
|
|
if (!m_TransientVerifier)
|
|
{
|
|
LogPrint (eLogError, "LeaseSet2: Offline signature failed");
|
|
return;
|
|
}
|
|
}
|
|
// outer ciphertext
|
|
if (offset + 2 > len) return;
|
|
uint16_t lenOuterCiphertext = bufbe16toh (buf + offset); offset += 2;
|
|
const uint8_t * outerCiphertext = buf + offset;
|
|
offset += lenOuterCiphertext;
|
|
// verify signature
|
|
bool verified = m_TransientVerifier ? VerifySignature (m_TransientVerifier, buf, len, offset) :
|
|
VerifySignature (blindedVerifier, buf, len, offset);
|
|
SetIsValid (verified);
|
|
// handle ciphertext
|
|
if (verified && key && lenOuterCiphertext >= 32)
|
|
{
|
|
SetIsValid (false); // we must verify it again in Layer 2
|
|
if (blindedKeyType == key->GetBlindedSigType ())
|
|
{
|
|
// verify blinding
|
|
char date[9];
|
|
i2p::util::GetDateString (m_PublishedTimestamp, date);
|
|
std::vector<uint8_t> blinded (blindedKeyLen);
|
|
key->GetBlindedKey (date, blinded.data ());
|
|
if (memcmp (blindedPublicKey, blinded.data (), blindedKeyLen))
|
|
{
|
|
LogPrint (eLogError, "LeaseSet2: Blinded public key doesn't match");
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogError, "LeaseSet2: Unexpected blinded key type ", blindedKeyType, " instead ", key->GetBlindedSigType ());
|
|
return;
|
|
}
|
|
// outer key
|
|
// outerInput = subcredential || publishedTimestamp
|
|
uint8_t subcredential[36];
|
|
key->GetSubcredential (blindedPublicKey, blindedKeyLen, subcredential);
|
|
memcpy (subcredential + 32, publishedTimestamp, 4);
|
|
// outerSalt = outerCiphertext[0:32]
|
|
// keys = HKDF(outerSalt, outerInput, "ELS2_L1K", 44)
|
|
uint8_t keys[64]; // 44 bytes actual data
|
|
i2p::crypto::HKDF (outerCiphertext, subcredential, 36, "ELS2_L1K", keys);
|
|
// decrypt Layer 1
|
|
// outerKey = keys[0:31]
|
|
// outerIV = keys[32:43]
|
|
size_t lenOuterPlaintext = lenOuterCiphertext - 32;
|
|
std::vector<uint8_t> outerPlainText (lenOuterPlaintext);
|
|
i2p::crypto::ChaCha20 (outerCiphertext + 32, lenOuterPlaintext, keys, keys + 32, outerPlainText.data ());
|
|
// inner key
|
|
// innerInput = authCookie || subcredential || publishedTimestamp
|
|
// innerSalt = innerCiphertext[0:32]
|
|
// keys = HKDF(innerSalt, innerInput, "ELS2_L2K", 44)
|
|
uint8_t innerInput[68];
|
|
size_t authDataLen = ExtractClientAuthData (outerPlainText.data (), lenOuterPlaintext, secret, subcredential, innerInput);
|
|
if (authDataLen > 0)
|
|
{
|
|
memcpy (innerInput + 32, subcredential, 36);
|
|
i2p::crypto::HKDF (outerPlainText.data () + 1 + authDataLen, innerInput, 68, "ELS2_L2K", keys);
|
|
}
|
|
else
|
|
// no authData presented, innerInput = subcredential || publishedTimestamp
|
|
// skip 1 byte flags
|
|
i2p::crypto::HKDF (outerPlainText.data () + 1, subcredential, 36, "ELS2_L2K", keys); // no authCookie
|
|
// decrypt Layer 2
|
|
// innerKey = keys[0:31]
|
|
// innerIV = keys[32:43]
|
|
size_t lenInnerPlaintext = lenOuterPlaintext - 32 - 1 - authDataLen;
|
|
std::vector<uint8_t> innerPlainText (lenInnerPlaintext);
|
|
i2p::crypto::ChaCha20 (outerPlainText.data () + 32 + 1 + authDataLen, lenInnerPlaintext, keys, keys + 32, innerPlainText.data ());
|
|
if (innerPlainText[0] == NETDB_STORE_TYPE_STANDARD_LEASESET2 || innerPlainText[0] == NETDB_STORE_TYPE_META_LEASESET2)
|
|
{
|
|
// override store type and buffer
|
|
m_StoreType = innerPlainText[0];
|
|
SetBuffer (innerPlainText.data () + 1, lenInnerPlaintext - 1);
|
|
// parse and verify Layer 2
|
|
ReadFromBuffer (innerPlainText.data () + 1, lenInnerPlaintext - 1);
|
|
}
|
|
else
|
|
LogPrint (eLogError, "LeaseSet2: Unexpected LeaseSet type ", (int)innerPlainText[0], " inside encrypted LeaseSet");
|
|
}
|
|
else
|
|
{
|
|
// we set actual length of encrypted buffer
|
|
offset += m_TransientVerifier ? m_TransientVerifier->GetSignatureLen () : blindedVerifier->GetSignatureLen ();
|
|
SetBufferLen (offset);
|
|
}
|
|
}
|
|
|
|
// helper for ExtractClientAuthData
|
|
static inline bool GetAuthCookie (const uint8_t * authClients, int numClients, const uint8_t * okm, uint8_t * authCookie)
|
|
{
|
|
// try to find clientCookie_i for clientID_i = okm[44:51]
|
|
for (int i = 0; i < numClients; i++)
|
|
{
|
|
if (!memcmp (okm + 44, authClients + i*40, 8)) // clientID_i
|
|
{
|
|
// clientKey_i = okm[0:31]
|
|
// clientIV_i = okm[32:43]
|
|
i2p::crypto::ChaCha20 (authClients + i*40 + 8, 32, okm, okm + 32, authCookie); // clientCookie_i
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
size_t LeaseSet2::ExtractClientAuthData (const uint8_t * buf, size_t len, const uint8_t * secret, const uint8_t * subcredential, uint8_t * authCookie) const
|
|
{
|
|
size_t offset = 0;
|
|
uint8_t flag = buf[offset]; offset++; // flag
|
|
if (flag & 0x01) // client auth
|
|
{
|
|
if (!(flag & 0x0E)) // DH, bit 1-3 all zeroes
|
|
{
|
|
const uint8_t * ephemeralPublicKey = buf + offset; offset += 32; // ephemeralPublicKey
|
|
uint16_t numClients = bufbe16toh (buf + offset); offset += 2; // clients
|
|
const uint8_t * authClients = buf + offset; offset += numClients*40; // authClients
|
|
if (offset > len)
|
|
{
|
|
LogPrint (eLogError, "LeaseSet2: Too many clients ", numClients, " in DH auth data");
|
|
return 0;
|
|
}
|
|
// calculate authCookie
|
|
if (secret)
|
|
{
|
|
i2p::crypto::X25519Keys ck (secret, nullptr); // derive cpk_i from csk_i
|
|
uint8_t authInput[100];
|
|
ck.Agree (ephemeralPublicKey, authInput); // sharedSecret is first 32 bytes of authInput
|
|
memcpy (authInput + 32, ck.GetPublicKey (), 32); // cpk_i
|
|
memcpy (authInput + 64, subcredential, 36);
|
|
uint8_t okm[64]; // 52 actual data
|
|
i2p::crypto::HKDF (ephemeralPublicKey, authInput, 100, "ELS2_XCA", okm);
|
|
if (!GetAuthCookie (authClients, numClients, okm, authCookie))
|
|
LogPrint (eLogError, "LeaseSet2: Client cookie DH not found");
|
|
}
|
|
else
|
|
LogPrint (eLogError, "LeaseSet2: Can't calculate authCookie: csk_i is not provided");
|
|
}
|
|
else if (flag & 0x02) // PSK, bit 1 is set to 1
|
|
{
|
|
const uint8_t * authSalt = buf + offset; offset += 32; // authSalt
|
|
uint16_t numClients = bufbe16toh (buf + offset); offset += 2; // clients
|
|
const uint8_t * authClients = buf + offset; offset += numClients*40; // authClients
|
|
if (offset > len)
|
|
{
|
|
LogPrint (eLogError, "LeaseSet2: Too many clients ", numClients, " in PSK auth data");
|
|
return 0;
|
|
}
|
|
// calculate authCookie
|
|
if (secret)
|
|
{
|
|
uint8_t authInput[68];
|
|
memcpy (authInput, secret, 32);
|
|
memcpy (authInput + 32, subcredential, 36);
|
|
uint8_t okm[64]; // 52 actual data
|
|
i2p::crypto::HKDF (authSalt, authInput, 68, "ELS2PSKA", okm);
|
|
if (!GetAuthCookie (authClients, numClients, okm, authCookie))
|
|
LogPrint (eLogError, "LeaseSet2: Client cookie PSK not found");
|
|
}
|
|
else
|
|
LogPrint (eLogError, "LeaseSet2: Can't calculate authCookie: psk_i is not provided");
|
|
}
|
|
else
|
|
LogPrint (eLogError, "LeaseSet2: Unknown client auth type ", (int)flag);
|
|
}
|
|
return offset - 1;
|
|
}
|
|
|
|
void LeaseSet2::Encrypt (const uint8_t * data, uint8_t * encrypted) const
|
|
{
|
|
auto encryptor = m_Encryptor; // TODO: atomic
|
|
if (encryptor)
|
|
encryptor->Encrypt (data, encrypted);
|
|
}
|
|
|
|
uint64_t LeaseSet2::ExtractExpirationTimestamp (const uint8_t * buf, size_t len) const
|
|
{
|
|
uint64_t expiration = 0;
|
|
ExtractPublishedTimestamp (buf, len, expiration);
|
|
return expiration;
|
|
}
|
|
|
|
uint64_t LeaseSet2::ExtractPublishedTimestamp (const uint8_t * buf, size_t len, uint64_t& expiration) const
|
|
{
|
|
if (len < 8) return 0;
|
|
if (m_StoreType == NETDB_STORE_TYPE_ENCRYPTED_LEASESET2)
|
|
{
|
|
// encrypted LS2
|
|
size_t offset = 0;
|
|
uint16_t blindedKeyType = bufbe16toh (buf + offset); offset += 2;
|
|
std::unique_ptr<i2p::crypto::Verifier> blindedVerifier (i2p::data::IdentityEx::CreateVerifier (blindedKeyType));
|
|
if (!blindedVerifier) return 0 ;
|
|
auto blindedKeyLen = blindedVerifier->GetPublicKeyLen ();
|
|
if (offset + blindedKeyLen + 6 >= len) return 0;
|
|
offset += blindedKeyLen;
|
|
uint32_t timestamp = bufbe32toh (buf + offset); offset += 4;
|
|
uint16_t expires = bufbe16toh (buf + offset); offset += 2;
|
|
expiration = (timestamp + expires)* 1000LL;
|
|
return timestamp;
|
|
}
|
|
else
|
|
{
|
|
auto identity = GetIdentity ();
|
|
if (!identity) return 0;
|
|
size_t offset = identity->GetFullLen ();
|
|
if (offset + 6 >= len) return 0;
|
|
uint32_t timestamp = bufbe32toh (buf + offset); offset += 4;
|
|
uint16_t expires = bufbe16toh (buf + offset); offset += 2;
|
|
expiration = (timestamp + expires)* 1000LL;
|
|
return timestamp;
|
|
}
|
|
}
|
|
|
|
LocalLeaseSet::LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * encryptionPublicKey, std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels):
|
|
m_ExpirationTime (0), m_Identity (identity)
|
|
{
|
|
int num = tunnels.size ();
|
|
if (num > MAX_NUM_LEASES) num = MAX_NUM_LEASES;
|
|
// identity
|
|
auto signingKeyLen = m_Identity->GetSigningPublicKeyLen ();
|
|
m_BufferLen = m_Identity->GetFullLen () + 256 + signingKeyLen + 1 + num*LEASE_SIZE + m_Identity->GetSignatureLen ();
|
|
m_Buffer = new uint8_t[m_BufferLen];
|
|
auto offset = m_Identity->ToBuffer (m_Buffer, m_BufferLen);
|
|
memcpy (m_Buffer + offset, encryptionPublicKey, 256);
|
|
offset += 256;
|
|
memset (m_Buffer + offset, 0, signingKeyLen);
|
|
offset += signingKeyLen;
|
|
// num leases
|
|
auto numLeasesPos = offset;
|
|
m_Buffer[offset] = num;
|
|
offset++;
|
|
// leases
|
|
m_Leases = m_Buffer + offset;
|
|
auto currentTime = i2p::util::GetMillisecondsSinceEpoch ();
|
|
int skipped = 0;
|
|
for (int i = 0; i < num; i++)
|
|
{
|
|
uint64_t ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // 1 minute before expiration
|
|
ts *= 1000; // in milliseconds
|
|
if (ts <= currentTime)
|
|
{
|
|
// already expired, skip
|
|
skipped++;
|
|
continue;
|
|
}
|
|
if (ts > m_ExpirationTime) m_ExpirationTime = ts;
|
|
// make sure leaseset is newer than previous, but adding some time to expiration date
|
|
ts += (currentTime - tunnels[i]->GetCreationTime ()*1000LL)*2/i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT; // up to 2 secs
|
|
memcpy (m_Buffer + offset, tunnels[i]->GetNextIdentHash (), 32);
|
|
offset += 32; // gateway id
|
|
htobe32buf (m_Buffer + offset, tunnels[i]->GetNextTunnelID ());
|
|
offset += 4; // tunnel id
|
|
htobe64buf (m_Buffer + offset, ts);
|
|
offset += 8; // end date
|
|
}
|
|
if (skipped > 0)
|
|
{
|
|
// adjust num leases
|
|
if (skipped > num) skipped = num;
|
|
num -= skipped;
|
|
m_BufferLen -= skipped*LEASE_SIZE;
|
|
m_Buffer[numLeasesPos] = num;
|
|
}
|
|
// we don't sign it yet. must be signed later on
|
|
}
|
|
|
|
LocalLeaseSet::LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len):
|
|
m_ExpirationTime (0), m_Identity (identity)
|
|
{
|
|
if (buf)
|
|
{
|
|
m_BufferLen = len;
|
|
m_Buffer = new uint8_t[m_BufferLen];
|
|
memcpy (m_Buffer, buf, len);
|
|
}
|
|
else
|
|
{
|
|
m_Buffer = nullptr;
|
|
m_BufferLen = 0;
|
|
}
|
|
}
|
|
|
|
bool LocalLeaseSet::IsExpired () const
|
|
{
|
|
auto ts = i2p::util::GetMillisecondsSinceEpoch ();
|
|
return ts > m_ExpirationTime;
|
|
}
|
|
|
|
bool LeaseSetBufferValidate(const uint8_t * ptr, size_t sz, uint64_t & expires)
|
|
{
|
|
IdentityEx ident(ptr, sz);
|
|
size_t size = ident.GetFullLen ();
|
|
if (size > sz)
|
|
{
|
|
LogPrint (eLogError, "LeaseSet: Identity length ", size, " exceeds buffer size ", sz);
|
|
return false;
|
|
}
|
|
// encryption key
|
|
size += 256;
|
|
// signing key (unused)
|
|
size += ident.GetSigningPublicKeyLen ();
|
|
uint8_t numLeases = ptr[size];
|
|
++size;
|
|
if (!numLeases || numLeases > MAX_NUM_LEASES)
|
|
{
|
|
LogPrint (eLogError, "LeaseSet: Incorrect number of leases", (int)numLeases);
|
|
return false;
|
|
}
|
|
const uint8_t * leases = ptr + size;
|
|
expires = 0;
|
|
/** find lease with the max expiration timestamp */
|
|
for (int i = 0; i < numLeases; i++)
|
|
{
|
|
leases += 36; // gateway + tunnel ID
|
|
uint64_t endDate = bufbe64toh (leases);
|
|
leases += 8; // end date
|
|
if(endDate > expires)
|
|
expires = endDate;
|
|
}
|
|
return ident.Verify(ptr, leases - ptr, leases);
|
|
}
|
|
|
|
LocalLeaseSet2::LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys,
|
|
const KeySections& encryptionKeys, const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels,
|
|
bool isPublic, uint64_t publishedTimestamp, bool isPublishedEncrypted):
|
|
LocalLeaseSet (keys.GetPublic (), nullptr, 0)
|
|
{
|
|
auto identity = keys.GetPublic ();
|
|
// assume standard LS2
|
|
int num = tunnels.size ();
|
|
if (num > MAX_NUM_LEASES) num = MAX_NUM_LEASES;
|
|
size_t keySectionsLen = 0;
|
|
for (const auto& it: encryptionKeys)
|
|
keySectionsLen += 2/*key type*/ + 2/*key len*/ + it.keyLen/*key*/;
|
|
m_BufferLen = identity->GetFullLen () + 4/*published*/ + 2/*expires*/ + 2/*flag*/ + 2/*properties len*/ +
|
|
1/*num keys*/ + keySectionsLen + 1/*num leases*/ + num*LEASE2_SIZE + keys.GetSignatureLen ();
|
|
uint16_t flags = 0;
|
|
if (keys.IsOfflineSignature ())
|
|
{
|
|
flags |= LEASESET2_FLAG_OFFLINE_KEYS;
|
|
m_BufferLen += keys.GetOfflineSignature ().size ();
|
|
}
|
|
if (isPublishedEncrypted)
|
|
{
|
|
flags |= LEASESET2_FLAG_PUBLISHED_ENCRYPTED;
|
|
isPublic = true;
|
|
}
|
|
if (!isPublic) flags |= LEASESET2_FLAG_UNPUBLISHED_LEASESET;
|
|
|
|
m_Buffer = new uint8_t[m_BufferLen + 1];
|
|
m_Buffer[0] = storeType;
|
|
// LS2 header
|
|
auto offset = identity->ToBuffer (m_Buffer + 1, m_BufferLen) + 1;
|
|
htobe32buf (m_Buffer + offset, publishedTimestamp); offset += 4; // published timestamp (seconds)
|
|
uint8_t * expiresBuf = m_Buffer + offset; offset += 2; // expires, fill later
|
|
htobe16buf (m_Buffer + offset, flags); offset += 2; // flags
|
|
if (keys.IsOfflineSignature ())
|
|
{
|
|
// offline signature
|
|
const auto& offlineSignature = keys.GetOfflineSignature ();
|
|
memcpy (m_Buffer + offset, offlineSignature.data (), offlineSignature.size ());
|
|
offset += offlineSignature.size ();
|
|
}
|
|
htobe16buf (m_Buffer + offset, 0); offset += 2; // properties len
|
|
// keys
|
|
m_Buffer[offset] = encryptionKeys.size (); offset++; // 1 key
|
|
for (const auto& it: encryptionKeys)
|
|
{
|
|
htobe16buf (m_Buffer + offset, it.keyType); offset += 2; // key type
|
|
htobe16buf (m_Buffer + offset, it.keyLen); offset += 2; // key len
|
|
memcpy (m_Buffer + offset, it.encryptionPublicKey, it.keyLen); offset += it.keyLen; // key
|
|
}
|
|
// leases
|
|
uint32_t expirationTime = 0; // in seconds
|
|
int skipped = 0; auto numLeasesPos = offset;
|
|
m_Buffer[offset] = num; offset++; // num leases
|
|
for (int i = 0; i < num; i++)
|
|
{
|
|
auto ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // in seconds, 1 minute before expiration
|
|
if (ts <= publishedTimestamp)
|
|
{
|
|
// already expired, skip
|
|
skipped++;
|
|
continue;
|
|
}
|
|
if (ts > expirationTime) expirationTime = ts;
|
|
memcpy (m_Buffer + offset, tunnels[i]->GetNextIdentHash (), 32);
|
|
offset += 32; // gateway id
|
|
htobe32buf (m_Buffer + offset, tunnels[i]->GetNextTunnelID ());
|
|
offset += 4; // tunnel id
|
|
htobe32buf (m_Buffer + offset, ts);
|
|
offset += 4; // end date
|
|
}
|
|
if (skipped > 0)
|
|
{
|
|
// adjust num leases
|
|
if (skipped > num) skipped = num;
|
|
num -= skipped;
|
|
m_BufferLen -= skipped*LEASE2_SIZE;
|
|
m_Buffer[numLeasesPos] = num;
|
|
}
|
|
// update expiration
|
|
if (expirationTime)
|
|
{
|
|
SetExpirationTime (expirationTime*1000LL);
|
|
auto expires = (int)expirationTime - publishedTimestamp;
|
|
htobe16buf (expiresBuf, expires > 0 ? expires : 0);
|
|
}
|
|
else
|
|
{
|
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// no tunnels or withdraw
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SetExpirationTime (publishedTimestamp*1000LL);
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memset (expiresBuf, 0, 2); // expires immeditely
|
|
}
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|
// sign
|
|
keys.Sign (m_Buffer, offset, m_Buffer + offset); // LS + leading store type
|
|
}
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|
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|
LocalLeaseSet2::LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len):
|
|
LocalLeaseSet (identity, nullptr, 0)
|
|
{
|
|
m_BufferLen = len;
|
|
m_Buffer = new uint8_t[m_BufferLen + 1];
|
|
memcpy (m_Buffer + 1, buf, len);
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|
m_Buffer[0] = storeType;
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|
}
|
|
|
|
LocalEncryptedLeaseSet2::LocalEncryptedLeaseSet2 (std::shared_ptr<const LocalLeaseSet2> ls, const i2p::data::PrivateKeys& keys,
|
|
int authType, std::shared_ptr<std::vector<AuthPublicKey> > authKeys):
|
|
LocalLeaseSet2 (ls->GetIdentity ()), m_InnerLeaseSet (ls)
|
|
{
|
|
size_t lenInnerPlaintext = ls->GetBufferLen () + 1, lenOuterPlaintext = lenInnerPlaintext + 32 + 1;
|
|
uint8_t layer1Flags = 0;
|
|
if (authKeys)
|
|
{
|
|
if (authType == ENCRYPTED_LEASESET_AUTH_TYPE_DH) layer1Flags |= 0x01; // DH, authentication scheme 0, auth bit 1
|
|
else if (authType == ENCRYPTED_LEASESET_AUTH_TYPE_PSK) layer1Flags |= 0x03; // PSK, authentication scheme 1, auth bit 1
|
|
if (layer1Flags)
|
|
lenOuterPlaintext += 32 + 2 + authKeys->size ()*40; // auth data len
|
|
}
|
|
size_t lenOuterCiphertext = lenOuterPlaintext + 32;
|
|
|
|
m_BufferLen = 2/*blinded sig type*/ + 32/*blinded pub key*/ + 4/*published*/ + 2/*expires*/ + 2/*flags*/ + 2/*lenOuterCiphertext*/ + lenOuterCiphertext + 64/*signature*/;
|
|
m_Buffer = new uint8_t[m_BufferLen + 1];
|
|
m_Buffer[0] = NETDB_STORE_TYPE_ENCRYPTED_LEASESET2;
|
|
BlindedPublicKey blindedKey (ls->GetIdentity ());
|
|
auto timestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
char date[9];
|
|
i2p::util::GetDateString (timestamp, date);
|
|
uint8_t blindedPriv[64], blindedPub[128]; // 64 and 128 max
|
|
size_t publicKeyLen = blindedKey.BlindPrivateKey (keys.GetSigningPrivateKey (), date, blindedPriv, blindedPub);
|
|
std::unique_ptr<i2p::crypto::Signer> blindedSigner (i2p::data::PrivateKeys::CreateSigner (blindedKey.GetBlindedSigType (), blindedPriv));
|
|
if (!blindedSigner)
|
|
{
|
|
LogPrint (eLogError, "LeaseSet2: Can't create blinded signer for signature type ", blindedKey.GetSigType ());
|
|
return;
|
|
}
|
|
auto offset = 1;
|
|
htobe16buf (m_Buffer + offset, blindedKey.GetBlindedSigType ()); offset += 2; // Blinded Public Key Sig Type
|
|
memcpy (m_Buffer + offset, blindedPub, publicKeyLen); offset += publicKeyLen; // Blinded Public Key
|
|
htobe32buf (m_Buffer + offset, timestamp); offset += 4; // published timestamp (seconds)
|
|
auto nextMidnight = (timestamp/86400LL + 1)*86400LL; // 86400 = 24*3600 seconds
|
|
auto expirationTime = ls->GetExpirationTime ()/1000LL;
|
|
if (expirationTime > nextMidnight) expirationTime = nextMidnight;
|
|
SetExpirationTime (expirationTime*1000LL);
|
|
htobe16buf (m_Buffer + offset, expirationTime > timestamp ? expirationTime - timestamp : 0); offset += 2; // expires
|
|
uint16_t flags = 0;
|
|
htobe16buf (m_Buffer + offset, flags); offset += 2; // flags
|
|
htobe16buf (m_Buffer + offset, lenOuterCiphertext); offset += 2; // lenOuterCiphertext
|
|
// outerChipherText
|
|
// Layer 1
|
|
uint8_t subcredential[36];
|
|
blindedKey.GetSubcredential (blindedPub, 32, subcredential);
|
|
htobe32buf (subcredential + 32, timestamp); // outerInput = subcredential || publishedTimestamp
|
|
// keys = HKDF(outerSalt, outerInput, "ELS2_L1K", 44)
|
|
uint8_t keys1[64]; // 44 bytes actual data
|
|
RAND_bytes (m_Buffer + offset, 32); // outerSalt = CSRNG(32)
|
|
i2p::crypto::HKDF (m_Buffer + offset, subcredential, 36, "ELS2_L1K", keys1);
|
|
offset += 32; // outerSalt
|
|
uint8_t * outerPlainText = m_Buffer + offset;
|
|
m_Buffer[offset] = layer1Flags; offset++; // layer 1 flags
|
|
// auth data
|
|
uint8_t innerInput[68]; // authCookie || subcredential || publishedTimestamp
|
|
if (layer1Flags)
|
|
{
|
|
RAND_bytes (innerInput, 32); // authCookie
|
|
CreateClientAuthData (subcredential, authType, authKeys, innerInput, m_Buffer + offset);
|
|
offset += 32 + 2 + authKeys->size ()*40; // auth clients
|
|
}
|
|
// Layer 2
|
|
// keys = HKDF(outerSalt, outerInput, "ELS2_L2K", 44)
|
|
uint8_t keys2[64]; // 44 bytes actual data
|
|
RAND_bytes (m_Buffer + offset, 32); // innerSalt = CSRNG(32)
|
|
if (layer1Flags)
|
|
{
|
|
memcpy (innerInput + 32, subcredential, 36); // + subcredential || publishedTimestamp
|
|
i2p::crypto::HKDF (m_Buffer + offset, innerInput, 68, "ELS2_L2K", keys2);
|
|
}
|
|
else
|
|
i2p::crypto::HKDF (m_Buffer + offset, subcredential, 36, "ELS2_L2K", keys2); // no authCookie
|
|
offset += 32; // innerSalt
|
|
m_Buffer[offset] = ls->GetStoreType ();
|
|
memcpy (m_Buffer + offset + 1, ls->GetBuffer (), ls->GetBufferLen ());
|
|
i2p::crypto::ChaCha20 (m_Buffer + offset, lenInnerPlaintext, keys2, keys2 + 32, m_Buffer + offset); // encrypt Layer 2
|
|
offset += lenInnerPlaintext;
|
|
i2p::crypto::ChaCha20 (outerPlainText, lenOuterPlaintext, keys1, keys1 + 32, outerPlainText); // encrypt Layer 1
|
|
// signature
|
|
blindedSigner->Sign (m_Buffer, offset, m_Buffer + offset);
|
|
// store hash
|
|
m_StoreHash = blindedKey.GetStoreHash (date);
|
|
}
|
|
|
|
LocalEncryptedLeaseSet2::LocalEncryptedLeaseSet2 (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len):
|
|
LocalLeaseSet2 (NETDB_STORE_TYPE_ENCRYPTED_LEASESET2, identity, buf, len)
|
|
{
|
|
// fill inner LeaseSet2
|
|
auto blindedKey = std::make_shared<BlindedPublicKey>(identity);
|
|
i2p::data::LeaseSet2 ls (buf, len, blindedKey); // inner layer
|
|
if (ls.IsValid ())
|
|
{
|
|
m_InnerLeaseSet = std::make_shared<LocalLeaseSet2>(ls.GetStoreType (), identity, ls.GetBuffer (), ls.GetBufferLen ());
|
|
m_StoreHash = blindedKey->GetStoreHash ();
|
|
}
|
|
else
|
|
LogPrint (eLogError, "LeaseSet2: Couldn't extract inner layer");
|
|
}
|
|
|
|
void LocalEncryptedLeaseSet2::CreateClientAuthData (const uint8_t * subcredential, int authType, std::shared_ptr<std::vector<AuthPublicKey> > authKeys, const uint8_t * authCookie, uint8_t * authData) const
|
|
{
|
|
if (authType == ENCRYPTED_LEASESET_AUTH_TYPE_DH)
|
|
{
|
|
i2p::crypto::X25519Keys ek;
|
|
ek.GenerateKeys (); // esk and epk
|
|
memcpy (authData, ek.GetPublicKey (), 32); authData += 32; // epk
|
|
htobe16buf (authData, authKeys->size ()); authData += 2; // num clients
|
|
uint8_t authInput[100]; // sharedSecret || cpk_i || subcredential || publishedTimestamp
|
|
memcpy (authInput + 64, subcredential, 36);
|
|
for (auto& it: *authKeys)
|
|
{
|
|
ek.Agree (it, authInput); // sharedSecret = DH(esk, cpk_i)
|
|
memcpy (authInput + 32, it, 32);
|
|
uint8_t okm[64]; // 52 actual data
|
|
i2p::crypto::HKDF (ek.GetPublicKey (), authInput, 100, "ELS2_XCA", okm);
|
|
memcpy (authData, okm + 44, 8); authData += 8; // clientID_i
|
|
i2p::crypto::ChaCha20 (authCookie, 32, okm, okm + 32, authData); authData += 32; // clientCookie_i
|
|
}
|
|
}
|
|
else // assume PSK
|
|
{
|
|
uint8_t authSalt[32];
|
|
RAND_bytes (authSalt, 32);
|
|
memcpy (authData, authSalt, 32); authData += 32; // authSalt
|
|
htobe16buf (authData, authKeys->size ()); authData += 2; // num clients
|
|
uint8_t authInput[68]; // authInput = psk_i || subcredential || publishedTimestamp
|
|
memcpy (authInput + 32, subcredential, 36);
|
|
for (auto& it: *authKeys)
|
|
{
|
|
memcpy (authInput, it, 32);
|
|
uint8_t okm[64]; // 52 actual data
|
|
i2p::crypto::HKDF (authSalt, authInput, 68, "ELS2PSKA", okm);
|
|
memcpy (authData, okm + 44, 8); authData += 8; // clientID_i
|
|
i2p::crypto::ChaCha20 (authCookie, 32, okm, okm + 32, authData); authData += 32; // clientCookie_i
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|