diff options
Diffstat (limited to 'src/netaddress.cpp')
| -rw-r--r-- | src/netaddress.cpp | 306 |
1 files changed, 254 insertions, 52 deletions
diff --git a/src/netaddress.cpp b/src/netaddress.cpp index b50cf74069..08714dc2ec 100644 --- a/src/netaddress.cpp +++ b/src/netaddress.cpp @@ -5,18 +5,112 @@ #include <netaddress.h> +#include <crypto/common.h> +#include <crypto/sha3.h> #include <hash.h> +#include <prevector.h> #include <tinyformat.h> -#include <util/strencodings.h> #include <util/asmap.h> +#include <util/strencodings.h> +#include <util/string.h> #include <algorithm> #include <array> #include <cstdint> +#include <ios> #include <iterator> #include <tuple> constexpr size_t CNetAddr::V1_SERIALIZATION_SIZE; +constexpr size_t CNetAddr::MAX_ADDRV2_SIZE; + +CNetAddr::BIP155Network CNetAddr::GetBIP155Network() const +{ + switch (m_net) { + case NET_IPV4: + return BIP155Network::IPV4; + case NET_IPV6: + return BIP155Network::IPV6; + case NET_ONION: + switch (m_addr.size()) { + case ADDR_TORV2_SIZE: + return BIP155Network::TORV2; + case ADDR_TORV3_SIZE: + return BIP155Network::TORV3; + default: + assert(false); + } + case NET_I2P: + return BIP155Network::I2P; + case NET_CJDNS: + return BIP155Network::CJDNS; + case NET_INTERNAL: // should have been handled before calling this function + case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE + case NET_MAX: // m_net is never and should not be set to NET_MAX + assert(false); + } // no default case, so the compiler can warn about missing cases + + assert(false); +} + +bool CNetAddr::SetNetFromBIP155Network(uint8_t possible_bip155_net, size_t address_size) +{ + switch (possible_bip155_net) { + case BIP155Network::IPV4: + if (address_size == ADDR_IPV4_SIZE) { + m_net = NET_IPV4; + return true; + } + throw std::ios_base::failure( + strprintf("BIP155 IPv4 address with length %u (should be %u)", address_size, + ADDR_IPV4_SIZE)); + case BIP155Network::IPV6: + if (address_size == ADDR_IPV6_SIZE) { + m_net = NET_IPV6; + return true; + } + throw std::ios_base::failure( + strprintf("BIP155 IPv6 address with length %u (should be %u)", address_size, + ADDR_IPV6_SIZE)); + case BIP155Network::TORV2: + if (address_size == ADDR_TORV2_SIZE) { + m_net = NET_ONION; + return true; + } + throw std::ios_base::failure( + strprintf("BIP155 TORv2 address with length %u (should be %u)", address_size, + ADDR_TORV2_SIZE)); + case BIP155Network::TORV3: + if (address_size == ADDR_TORV3_SIZE) { + m_net = NET_ONION; + return true; + } + throw std::ios_base::failure( + strprintf("BIP155 TORv3 address with length %u (should be %u)", address_size, + ADDR_TORV3_SIZE)); + case BIP155Network::I2P: + if (address_size == ADDR_I2P_SIZE) { + m_net = NET_I2P; + return true; + } + throw std::ios_base::failure( + strprintf("BIP155 I2P address with length %u (should be %u)", address_size, + ADDR_I2P_SIZE)); + case BIP155Network::CJDNS: + if (address_size == ADDR_CJDNS_SIZE) { + m_net = NET_CJDNS; + return true; + } + throw std::ios_base::failure( + strprintf("BIP155 CJDNS address with length %u (should be %u)", address_size, + ADDR_CJDNS_SIZE)); + } + + // Don't throw on addresses with unknown network ids (maybe from the future). + // Instead silently drop them and have the unserialization code consume + // subsequent ones which may be known to us. + return false; +} /** * Construct an unspecified IPv6 network address (::/128). @@ -36,7 +130,13 @@ void CNetAddr::SetIP(const CNetAddr& ipIn) assert(ipIn.m_addr.size() == ADDR_IPV6_SIZE); break; case NET_ONION: - assert(ipIn.m_addr.size() == ADDR_TORV2_SIZE); + assert(ipIn.m_addr.size() == ADDR_TORV2_SIZE || ipIn.m_addr.size() == ADDR_TORV3_SIZE); + break; + case NET_I2P: + assert(ipIn.m_addr.size() == ADDR_I2P_SIZE); + break; + case NET_CJDNS: + assert(ipIn.m_addr.size() == ADDR_CJDNS_SIZE); break; case NET_INTERNAL: assert(ipIn.m_addr.size() == ADDR_INTERNAL_SIZE); @@ -50,13 +150,6 @@ void CNetAddr::SetIP(const CNetAddr& ipIn) m_addr = ipIn.m_addr; } -template <typename T1, size_t PREFIX_LEN> -inline bool HasPrefix(const T1& obj, const std::array<uint8_t, PREFIX_LEN>& prefix) -{ - return obj.size() >= PREFIX_LEN && - std::equal(std::begin(prefix), std::end(prefix), std::begin(obj)); -} - void CNetAddr::SetLegacyIPv6(Span<const uint8_t> ipv6) { assert(ipv6.size() == ADDR_IPV6_SIZE); @@ -101,24 +194,80 @@ bool CNetAddr::SetInternal(const std::string &name) return true; } +namespace torv3 { +// https://gitweb.torproject.org/torspec.git/tree/rend-spec-v3.txt#n2135 +static constexpr size_t CHECKSUM_LEN = 2; +static const unsigned char VERSION[] = {3}; +static constexpr size_t TOTAL_LEN = ADDR_TORV3_SIZE + CHECKSUM_LEN + sizeof(VERSION); + +static void Checksum(Span<const uint8_t> addr_pubkey, uint8_t (&checksum)[CHECKSUM_LEN]) +{ + // TORv3 CHECKSUM = H(".onion checksum" | PUBKEY | VERSION)[:2] + static const unsigned char prefix[] = ".onion checksum"; + static constexpr size_t prefix_len = 15; + + SHA3_256 hasher; + + hasher.Write(MakeSpan(prefix).first(prefix_len)); + hasher.Write(addr_pubkey); + hasher.Write(VERSION); + + uint8_t checksum_full[SHA3_256::OUTPUT_SIZE]; + + hasher.Finalize(checksum_full); + + memcpy(checksum, checksum_full, sizeof(checksum)); +} + +}; // namespace torv3 + /** - * Parse a TORv2 address and set this object to it. + * Parse a TOR address and set this object to it. * * @returns Whether or not the operation was successful. * * @see CNetAddr::IsTor() */ -bool CNetAddr::SetSpecial(const std::string &strName) +bool CNetAddr::SetSpecial(const std::string& str) { - if (strName.size()>6 && strName.substr(strName.size() - 6, 6) == ".onion") { - std::vector<unsigned char> vchAddr = DecodeBase32(strName.substr(0, strName.size() - 6).c_str()); - if (vchAddr.size() != ADDR_TORV2_SIZE) { + static const char* suffix{".onion"}; + static constexpr size_t suffix_len{6}; + + if (!ValidAsCString(str) || str.size() <= suffix_len || + str.substr(str.size() - suffix_len) != suffix) { + return false; + } + + bool invalid; + const auto& input = DecodeBase32(str.substr(0, str.size() - suffix_len).c_str(), &invalid); + + if (invalid) { + return false; + } + + switch (input.size()) { + case ADDR_TORV2_SIZE: + m_net = NET_ONION; + m_addr.assign(input.begin(), input.end()); + return true; + case torv3::TOTAL_LEN: { + Span<const uint8_t> input_pubkey{input.data(), ADDR_TORV3_SIZE}; + Span<const uint8_t> input_checksum{input.data() + ADDR_TORV3_SIZE, torv3::CHECKSUM_LEN}; + Span<const uint8_t> input_version{input.data() + ADDR_TORV3_SIZE + torv3::CHECKSUM_LEN, sizeof(torv3::VERSION)}; + + uint8_t calculated_checksum[torv3::CHECKSUM_LEN]; + torv3::Checksum(input_pubkey, calculated_checksum); + + if (input_checksum != calculated_checksum || input_version != torv3::VERSION) { return false; } + m_net = NET_ONION; - m_addr.assign(vchAddr.begin(), vchAddr.end()); + m_addr.assign(input_pubkey.begin(), input_pubkey.end()); return true; } + } + return false; } @@ -235,13 +384,21 @@ bool CNetAddr::IsHeNet() const } /** - * @returns Whether or not this is a dummy address that maps an onion address - * into IPv6. - * + * Check whether this object represents a TOR address. * @see CNetAddr::SetSpecial(const std::string &) */ bool CNetAddr::IsTor() const { return m_net == NET_ONION; } +/** + * Check whether this object represents an I2P address. + */ +bool CNetAddr::IsI2P() const { return m_net == NET_I2P; } + +/** + * Check whether this object represents a CJDNS address. + */ +bool CNetAddr::IsCJDNS() const { return m_net == NET_CJDNS; } + bool CNetAddr::IsLocal() const { // IPv4 loopback (127.0.0.0/8 or 0.0.0.0/8) @@ -328,28 +485,72 @@ enum Network CNetAddr::GetNetwork() const return m_net; } +static std::string IPv6ToString(Span<const uint8_t> a) +{ + assert(a.size() == ADDR_IPV6_SIZE); + // clang-format off + return strprintf("%x:%x:%x:%x:%x:%x:%x:%x", + ReadBE16(&a[0]), + ReadBE16(&a[2]), + ReadBE16(&a[4]), + ReadBE16(&a[6]), + ReadBE16(&a[8]), + ReadBE16(&a[10]), + ReadBE16(&a[12]), + ReadBE16(&a[14])); + // clang-format on +} + std::string CNetAddr::ToStringIP() const { - if (IsTor()) - return EncodeBase32(m_addr) + ".onion"; - if (IsInternal()) + switch (m_net) { + case NET_IPV4: + case NET_IPV6: { + CService serv(*this, 0); + struct sockaddr_storage sockaddr; + socklen_t socklen = sizeof(sockaddr); + if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) { + char name[1025] = ""; + if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, + sizeof(name), nullptr, 0, NI_NUMERICHOST)) + return std::string(name); + } + if (m_net == NET_IPV4) { + return strprintf("%u.%u.%u.%u", m_addr[0], m_addr[1], m_addr[2], m_addr[3]); + } + return IPv6ToString(m_addr); + } + case NET_ONION: + switch (m_addr.size()) { + case ADDR_TORV2_SIZE: + return EncodeBase32(m_addr) + ".onion"; + case ADDR_TORV3_SIZE: { + + uint8_t checksum[torv3::CHECKSUM_LEN]; + torv3::Checksum(m_addr, checksum); + + // TORv3 onion_address = base32(PUBKEY | CHECKSUM | VERSION) + ".onion" + prevector<torv3::TOTAL_LEN, uint8_t> address{m_addr.begin(), m_addr.end()}; + address.insert(address.end(), checksum, checksum + torv3::CHECKSUM_LEN); + address.insert(address.end(), torv3::VERSION, torv3::VERSION + sizeof(torv3::VERSION)); + + return EncodeBase32(address) + ".onion"; + } + default: + assert(false); + } + case NET_I2P: + return EncodeBase32(m_addr, false /* don't pad with = */) + ".b32.i2p"; + case NET_CJDNS: + return IPv6ToString(m_addr); + case NET_INTERNAL: return EncodeBase32(m_addr) + ".internal"; - CService serv(*this, 0); - struct sockaddr_storage sockaddr; - socklen_t socklen = sizeof(sockaddr); - if (serv.GetSockAddr((struct sockaddr*)&sockaddr, &socklen)) { - char name[1025] = ""; - if (!getnameinfo((const struct sockaddr*)&sockaddr, socklen, name, sizeof(name), nullptr, 0, NI_NUMERICHOST)) - return std::string(name); - } - if (IsIPv4()) - return strprintf("%u.%u.%u.%u", m_addr[0], m_addr[1], m_addr[2], m_addr[3]); - assert(IsIPv6()); - return strprintf("%x:%x:%x:%x:%x:%x:%x:%x", - m_addr[0] << 8 | m_addr[1], m_addr[2] << 8 | m_addr[3], - m_addr[4] << 8 | m_addr[5], m_addr[6] << 8 | m_addr[7], - m_addr[8] << 8 | m_addr[9], m_addr[10] << 8 | m_addr[11], - m_addr[12] << 8 | m_addr[13], m_addr[14] << 8 | m_addr[15]); + case NET_UNROUTABLE: // m_net is never and should not be set to NET_UNROUTABLE + case NET_MAX: // m_net is never and should not be set to NET_MAX + assert(false); + } // no default case, so the compiler can warn about missing cases + + assert(false); } std::string CNetAddr::ToString() const @@ -428,21 +629,22 @@ uint32_t CNetAddr::GetLinkedIPv4() const assert(false); } -uint32_t CNetAddr::GetNetClass() const { - uint32_t net_class = NET_IPV6; - if (IsLocal()) { - net_class = 255; - } +uint32_t CNetAddr::GetNetClass() const +{ + // Make sure that if we return NET_IPV6, then IsIPv6() is true. The callers expect that. + + // Check for "internal" first because such addresses are also !IsRoutable() + // and we don't want to return NET_UNROUTABLE in that case. if (IsInternal()) { - net_class = NET_INTERNAL; - } else if (!IsRoutable()) { - net_class = NET_UNROUTABLE; - } else if (HasLinkedIPv4()) { - net_class = NET_IPV4; - } else if (IsTor()) { - net_class = NET_ONION; + return NET_INTERNAL; } - return net_class; + if (!IsRoutable()) { + return NET_UNROUTABLE; + } + if (HasLinkedIPv4()) { + return NET_IPV4; + } + return m_net; } uint32_t CNetAddr::GetMappedAS(const std::vector<bool> &asmap) const { @@ -517,7 +719,7 @@ std::vector<unsigned char> CNetAddr::GetGroup(const std::vector<bool> &asmap) co vchRet.push_back((ipv4 >> 24) & 0xFF); vchRet.push_back((ipv4 >> 16) & 0xFF); return vchRet; - } else if (IsTor()) { + } else if (IsTor() || IsI2P() || IsCJDNS()) { nBits = 4; } else if (IsHeNet()) { // for he.net, use /36 groups @@ -742,7 +944,7 @@ std::string CService::ToStringPort() const std::string CService::ToStringIPPort() const { - if (IsIPv4() || IsTor() || IsInternal()) { + if (IsIPv4() || IsTor() || IsI2P() || IsInternal()) { return ToStringIP() + ":" + ToStringPort(); } else { return "[" + ToStringIP() + "]:" + ToStringPort(); |