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I2P: End-to-End encrypted and anonymous Internet
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310 lines
12 KiB
310 lines
12 KiB
/* |
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* Copyright (c) 2013-2023, 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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#ifndef LEASE_SET_H__ |
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#define LEASE_SET_H__ |
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#include <inttypes.h> |
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#include <string.h> |
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#include <vector> |
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#include <set> |
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#include <memory> |
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#include "Identity.h" |
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#include "Timestamp.h" |
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#include "I2PEndian.h" |
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#include "Blinding.h" |
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namespace i2p |
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{ |
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namespace tunnel |
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{ |
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class InboundTunnel; |
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} |
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namespace data |
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{ |
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const int LEASE_ENDDATE_THRESHOLD = 51000; // in milliseconds |
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struct Lease |
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{ |
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IdentHash tunnelGateway; |
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uint32_t tunnelID; |
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uint64_t endDate; // 0 means invalid |
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bool isUpdated; // transient |
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/* return true if this lease expires within t millisecond + fudge factor */ |
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bool ExpiresWithin( const uint64_t t, const uint64_t fudge = 1000 ) const { |
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auto expire = i2p::util::GetMillisecondsSinceEpoch (); |
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if(fudge) expire += rand() % fudge; |
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if (endDate < expire) return true; |
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return (endDate - expire) < t; |
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} |
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}; |
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struct LeaseCmp |
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{ |
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bool operator() (std::shared_ptr<const Lease> l1, std::shared_ptr<const Lease> l2) const |
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{ |
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if (l1->tunnelID != l2->tunnelID) |
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return l1->tunnelID < l2->tunnelID; |
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else |
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return l1->tunnelGateway < l2->tunnelGateway; |
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}; |
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}; |
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typedef std::function<bool(const Lease & l)> LeaseInspectFunc; |
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const size_t MAX_LS_BUFFER_SIZE = 3072; |
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const size_t LEASE_SIZE = 44; // 32 + 4 + 8 |
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const size_t LEASE2_SIZE = 40; // 32 + 4 + 4 |
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const uint8_t MAX_NUM_LEASES = 16; |
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const uint8_t NETDB_STORE_TYPE_LEASESET = 1; |
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class LeaseSet: public RoutingDestination |
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{ |
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public: |
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LeaseSet (const uint8_t * buf, size_t len, bool storeLeases = true); |
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virtual ~LeaseSet () { delete[] m_EncryptionKey; delete[] m_Buffer; }; |
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virtual void Update (const uint8_t * buf, size_t len, bool verifySignature = true); |
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virtual bool IsNewer (const uint8_t * buf, size_t len) const; |
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void PopulateLeases (); // from buffer |
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const uint8_t * GetBuffer () const { return m_Buffer; }; |
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size_t GetBufferLen () const { return m_BufferLen; }; |
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bool IsValid () const { return m_IsValid; }; |
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const std::vector<std::shared_ptr<const Lease> > GetNonExpiredLeases (bool withThreshold = true) const; |
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const std::vector<std::shared_ptr<const Lease> > GetNonExpiredLeasesExcluding (LeaseInspectFunc exclude, bool withThreshold = true) const; |
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bool HasExpiredLeases () const; |
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bool IsExpired () const; |
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bool IsEmpty () const { return m_Leases.empty (); }; |
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uint64_t GetExpirationTime () const { return m_ExpirationTime; }; |
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bool ExpiresSoon(const uint64_t dlt=1000 * 5, const uint64_t fudge = 0) const ; |
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bool operator== (const LeaseSet& other) const |
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{ return m_BufferLen == other.m_BufferLen && !memcmp (m_Buffer, other.m_Buffer, m_BufferLen); }; |
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virtual uint8_t GetStoreType () const { return NETDB_STORE_TYPE_LEASESET; }; |
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virtual uint32_t GetPublishedTimestamp () const { return 0; }; // should be set for LeaseSet2 only |
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virtual std::shared_ptr<const i2p::crypto::Verifier> GetTransientVerifier () const { return nullptr; }; |
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virtual bool IsPublishedEncrypted () const { return false; }; |
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// implements RoutingDestination |
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std::shared_ptr<const IdentityEx> GetIdentity () const { return m_Identity; }; |
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void Encrypt (const uint8_t * data, uint8_t * encrypted) const; |
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bool IsDestination () const { return true; }; |
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// used in webconsole |
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void ExpireLease () { m_ExpirationTime = i2p::util::GetSecondsSinceEpoch (); }; |
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protected: |
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void UpdateLeasesBegin (); |
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void UpdateLeasesEnd (); |
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void UpdateLease (const Lease& lease, uint64_t ts); |
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// called from LeaseSet2 |
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LeaseSet (bool storeLeases); |
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void SetBuffer (const uint8_t * buf, size_t len); |
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void SetBufferLen (size_t len); |
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void SetIdentity (std::shared_ptr<const IdentityEx> identity) { m_Identity = identity; }; |
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void SetExpirationTime (uint64_t t) { m_ExpirationTime = t; }; |
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void SetIsValid (bool isValid) { m_IsValid = isValid; }; |
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bool IsStoreLeases () const { return m_StoreLeases; }; |
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private: |
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void ReadFromBuffer (bool readIdentity = true, bool verifySignature = true); |
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virtual uint64_t ExtractExpirationTimestamp (const uint8_t * buf, size_t len) const; // returns max expiration time |
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private: |
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bool m_IsValid, m_StoreLeases; // we don't need to store leases for floodfill |
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std::set<std::shared_ptr<Lease>, LeaseCmp> m_Leases; |
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uint64_t m_ExpirationTime; // in milliseconds |
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std::shared_ptr<const IdentityEx> m_Identity; |
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uint8_t * m_EncryptionKey; |
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uint8_t * m_Buffer; |
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size_t m_BufferLen; |
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}; |
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/** |
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* validate lease set buffer signature and extract expiration timestamp |
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* @returns true if the leaseset is well formed and signature is valid |
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*/ |
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bool LeaseSetBufferValidate(const uint8_t * ptr, size_t sz, uint64_t & expires); |
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const uint8_t NETDB_STORE_TYPE_STANDARD_LEASESET2 = 3; |
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const uint8_t NETDB_STORE_TYPE_ENCRYPTED_LEASESET2 = 5; |
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const uint8_t NETDB_STORE_TYPE_META_LEASESET2 = 7; |
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const uint16_t LEASESET2_FLAG_OFFLINE_KEYS = 0x0001; |
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const uint16_t LEASESET2_FLAG_UNPUBLISHED_LEASESET = 0x0002; |
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const uint16_t LEASESET2_FLAG_PUBLISHED_ENCRYPTED = 0x0004; |
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class LeaseSet2: public LeaseSet |
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{ |
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public: |
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LeaseSet2 (uint8_t storeType): LeaseSet (true), m_StoreType (storeType) {}; // for update |
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LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases = true, CryptoKeyType preferredCrypto = CRYPTO_KEY_TYPE_ELGAMAL); |
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LeaseSet2 (const uint8_t * buf, size_t len, std::shared_ptr<const BlindedPublicKey> key, const uint8_t * secret = nullptr, CryptoKeyType preferredCrypto = CRYPTO_KEY_TYPE_ELGAMAL); // store type 5, called from local netdb only |
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uint8_t GetStoreType () const { return m_StoreType; }; |
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uint32_t GetPublishedTimestamp () const { return m_PublishedTimestamp; }; |
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bool IsPublic () const { return m_IsPublic; }; |
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bool IsPublishedEncrypted () const { return m_IsPublishedEncrypted; }; |
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std::shared_ptr<const i2p::crypto::Verifier> GetTransientVerifier () const { return m_TransientVerifier; }; |
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void Update (const uint8_t * buf, size_t len, bool verifySignature); |
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bool IsNewer (const uint8_t * buf, size_t len) const; |
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// implements RoutingDestination |
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void Encrypt (const uint8_t * data, uint8_t * encrypted) const; |
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CryptoKeyType GetEncryptionType () const { return m_EncryptionType; }; |
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private: |
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void ReadFromBuffer (const uint8_t * buf, size_t len, bool readIdentity = true, bool verifySignature = true); |
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void ReadFromBufferEncrypted (const uint8_t * buf, size_t len, std::shared_ptr<const BlindedPublicKey> key, const uint8_t * secret); |
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size_t ReadStandardLS2TypeSpecificPart (const uint8_t * buf, size_t len); |
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size_t ReadMetaLS2TypeSpecificPart (const uint8_t * buf, size_t len); |
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template<typename Verifier> |
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bool VerifySignature (Verifier& verifier, const uint8_t * buf, size_t len, size_t signatureOffset); |
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uint64_t ExtractExpirationTimestamp (const uint8_t * buf, size_t len) const; |
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uint64_t ExtractPublishedTimestamp (const uint8_t * buf, size_t len, uint64_t& expiration) const; |
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size_t ExtractClientAuthData (const uint8_t * buf, size_t len, const uint8_t * secret, const uint8_t * subcredential, uint8_t * authCookie) const; // subcredential is subcredential + timestamp, return length of autData without flag |
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private: |
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uint8_t m_StoreType; |
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uint32_t m_PublishedTimestamp = 0; |
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bool m_IsPublic = true, m_IsPublishedEncrypted = false; |
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std::shared_ptr<i2p::crypto::Verifier> m_TransientVerifier; |
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CryptoKeyType m_EncryptionType; |
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std::shared_ptr<i2p::crypto::CryptoKeyEncryptor> m_Encryptor; // for standardLS2 |
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}; |
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// also called from Streaming.cpp |
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template<typename Verifier> |
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std::shared_ptr<i2p::crypto::Verifier> ProcessOfflineSignature (const Verifier& verifier, const uint8_t * buf, size_t len, size_t& offset) |
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{ |
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if (offset + 6 >= len) return nullptr; |
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const uint8_t * signedData = buf + offset; |
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uint32_t expiresTimestamp = bufbe32toh (buf + offset); offset += 4; // expires timestamp |
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if (expiresTimestamp < i2p::util::GetSecondsSinceEpoch ()) return nullptr; |
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uint16_t keyType = bufbe16toh (buf + offset); offset += 2; |
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std::shared_ptr<i2p::crypto::Verifier> transientVerifier (i2p::data::IdentityEx::CreateVerifier (keyType)); |
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if (!transientVerifier) return nullptr; |
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auto keyLen = transientVerifier->GetPublicKeyLen (); |
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if (offset + keyLen >= len) return nullptr; |
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transientVerifier->SetPublicKey (buf + offset); offset += keyLen; |
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if (offset + verifier->GetSignatureLen () >= len) return nullptr; |
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if (!verifier->Verify (signedData, keyLen + 6, buf + offset)) return nullptr; |
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offset += verifier->GetSignatureLen (); |
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return transientVerifier; |
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} |
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//------------------------------------------------------------------------------------ |
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class LocalLeaseSet |
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{ |
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public: |
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LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * encryptionPublicKey, std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels); |
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LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len); |
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virtual ~LocalLeaseSet () { delete[] m_Buffer; }; |
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virtual uint8_t * GetBuffer () const { return m_Buffer; }; |
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uint8_t * GetSignature () { return GetBuffer () + GetBufferLen () - GetSignatureLen (); }; |
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virtual size_t GetBufferLen () const { return m_BufferLen; }; |
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size_t GetSignatureLen () const { return m_Identity->GetSignatureLen (); }; |
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uint8_t * GetLeases () { return m_Leases; }; |
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const IdentHash& GetIdentHash () const { return m_Identity->GetIdentHash (); }; |
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std::shared_ptr<const IdentityEx> GetIdentity () const { return m_Identity; }; |
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bool IsExpired () const; |
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uint64_t GetExpirationTime () const { return m_ExpirationTime; }; |
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void SetExpirationTime (uint64_t expirationTime) { m_ExpirationTime = expirationTime; }; |
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bool operator== (const LeaseSet& other) const |
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{ return GetBufferLen () == other.GetBufferLen () && !memcmp (GetBuffer (), other.GetBuffer (), GetBufferLen ()); }; |
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virtual uint8_t GetStoreType () const { return NETDB_STORE_TYPE_LEASESET; }; |
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virtual const IdentHash& GetStoreHash () const { return GetIdentHash (); }; // differ from ident hash for encrypted LeaseSet2 |
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virtual std::shared_ptr<const LocalLeaseSet> GetInnerLeaseSet () const { return nullptr; }; // non-null for encrypted LeaseSet2 |
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private: |
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uint64_t m_ExpirationTime; // in milliseconds |
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std::shared_ptr<const IdentityEx> m_Identity; |
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uint8_t * m_Buffer, * m_Leases; |
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size_t m_BufferLen; |
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}; |
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class LocalLeaseSet2: public LocalLeaseSet |
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{ |
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public: |
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struct KeySection |
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{ |
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uint16_t keyType, keyLen; |
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const uint8_t * encryptionPublicKey; |
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}; |
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typedef std::vector<KeySection> KeySections; |
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LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys, |
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const KeySections& encryptionKeys, |
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const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels, |
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bool isPublic, bool isPublishedEncrypted = false); |
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LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len); // from I2CP |
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virtual ~LocalLeaseSet2 () { delete[] m_Buffer; }; |
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uint8_t * GetBuffer () const { return m_Buffer + 1; }; |
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size_t GetBufferLen () const { return m_BufferLen; }; |
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uint8_t GetStoreType () const { return m_Buffer[0]; }; |
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protected: |
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LocalLeaseSet2 (std::shared_ptr<const IdentityEx> identity): LocalLeaseSet (identity, nullptr, 0), m_Buffer (nullptr), m_BufferLen(0) {}; // called from LocalEncryptedLeaseSet2 |
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protected: |
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uint8_t * m_Buffer; // 1 byte store type + actual buffer |
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size_t m_BufferLen; |
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}; |
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const int ENCRYPTED_LEASESET_AUTH_TYPE_NONE = 0; |
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const int ENCRYPTED_LEASESET_AUTH_TYPE_DH = 1; |
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const int ENCRYPTED_LEASESET_AUTH_TYPE_PSK = 2; |
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typedef i2p::data::Tag<32> AuthPublicKey; |
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class LocalEncryptedLeaseSet2: public LocalLeaseSet2 |
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{ |
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public: |
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LocalEncryptedLeaseSet2 (std::shared_ptr<const LocalLeaseSet2> ls, const i2p::data::PrivateKeys& keys, int authType = ENCRYPTED_LEASESET_AUTH_TYPE_NONE, std::shared_ptr<std::vector<AuthPublicKey> > authKeys = nullptr); |
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LocalEncryptedLeaseSet2 (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len); // from I2CP |
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const IdentHash& GetStoreHash () const { return m_StoreHash; }; |
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std::shared_ptr<const LocalLeaseSet> GetInnerLeaseSet () const { return m_InnerLeaseSet; }; |
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private: |
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void CreateClientAuthData (const uint8_t * subcredential, int authType, std::shared_ptr<std::vector<AuthPublicKey> > authKeys, const uint8_t * authCookie, uint8_t * authData) const; |
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private: |
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IdentHash m_StoreHash; |
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std::shared_ptr<const LocalLeaseSet2> m_InnerLeaseSet; |
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}; |
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} |
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} |
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#endif
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