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432 lines
12 KiB
C++
432 lines
12 KiB
C++
#pragma once
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#include <string.h>
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#include <Poco/RegularExpression.h>
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#include <Poco/Net/IPAddress.h>
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#include <Poco/Net/SocketAddress.h>
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#include <Poco/Net/DNS.h>
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#include <Poco/Util/Application.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <Poco/String.h>
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#include <DB/Core/Types.h>
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#include <DB/Common/Exception.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/HexWriteBuffer.h>
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#include <DB/IO/WriteBufferFromString.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/Common/SimpleCache.h>
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#include <DB/Common/StringUtils.h>
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#include <openssl/sha.h>
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#include <common/logger_useful.h>
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#include <unordered_set>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int DNS_ERROR;
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extern const int UNKNOWN_ADDRESS_PATTERN_TYPE;
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extern const int UNKNOWN_USER;
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extern const int REQUIRED_PASSWORD;
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extern const int WRONG_PASSWORD;
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extern const int IP_ADDRESS_NOT_ALLOWED;
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}
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/// Позволяет проверить соответствие адреса шаблону.
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class IAddressPattern
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{
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public:
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virtual bool contains(const Poco::Net::IPAddress & addr) const = 0;
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virtual ~IAddressPattern() {}
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static Poco::Net::IPAddress toIPv6(const Poco::Net::IPAddress addr)
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{
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if (addr.family() == Poco::Net::IPAddress::IPv6)
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return addr;
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return Poco::Net::IPAddress("::FFFF:" + addr.toString());
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}
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};
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/// IP-адрес или маска подсети. Например, 213.180.204.3 или 10.0.0.1/8 или 2a02:6b8::3 или 2a02:6b8::3/64.
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class IPAddressPattern : public IAddressPattern
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{
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private:
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/// Адрес маски. Всегда переводится в IPv6.
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Poco::Net::IPAddress mask_address;
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/// Количество бит в маске.
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UInt8 prefix_bits;
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public:
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explicit IPAddressPattern(const String & str)
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{
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const char * pos = strchr(str.c_str(), '/');
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if (nullptr == pos)
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{
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construct(Poco::Net::IPAddress(str));
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}
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else
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{
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String addr(str, 0, pos - str.c_str());
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UInt8 prefix_bits_ = parse<UInt8>(pos + 1);
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construct(Poco::Net::IPAddress(addr), prefix_bits_);
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}
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}
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bool contains(const Poco::Net::IPAddress & addr) const
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{
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return prefixBitsEquals(reinterpret_cast<const char *>(toIPv6(addr).addr()), reinterpret_cast<const char *>(mask_address.addr()), prefix_bits);
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}
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private:
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void construct(const Poco::Net::IPAddress & mask_address_)
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{
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mask_address = toIPv6(mask_address_);
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prefix_bits = 128;
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}
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void construct(const Poco::Net::IPAddress & mask_address_, UInt8 prefix_bits_)
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{
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mask_address = toIPv6(mask_address_);
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prefix_bits = mask_address_.family() == Poco::Net::IPAddress::IPv4
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? prefix_bits_ + 96
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: prefix_bits_;
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}
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static bool prefixBitsEquals(const char * lhs, const char * rhs, UInt8 prefix_bits)
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{
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UInt8 prefix_bytes = prefix_bits / 8;
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UInt8 remaining_bits = prefix_bits % 8;
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return 0 == memcmp(lhs, rhs, prefix_bytes)
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&& (remaining_bits % 8 == 0
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|| (lhs[prefix_bytes] >> (8 - remaining_bits)) == (rhs[prefix_bytes] >> (8 - remaining_bits)));
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}
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};
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/// Проверяет соответствие адреса одному из адресов хоста.
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class HostExactPattern : public IAddressPattern
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{
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private:
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String host;
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static bool containsImpl(const String & host, const Poco::Net::IPAddress & addr)
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{
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Poco::Net::IPAddress addr_v6 = toIPv6(addr);
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/// Резолвим вручную, потому что в Poco не используется флаг AI_ALL, а он важен.
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addrinfo * ai = nullptr;
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addrinfo hints;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_flags |= AI_V4MAPPED | AI_ALL;
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int ret = getaddrinfo(host.c_str(), nullptr, &hints, &ai);
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if (0 != ret)
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throw Exception("Cannot getaddrinfo: " + std::string(gai_strerror(ret)), ErrorCodes::DNS_ERROR);
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try
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{
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for (; ai != nullptr; ai = ai->ai_next)
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{
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if (ai->ai_addrlen && ai->ai_addr)
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{
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if (ai->ai_family == AF_INET6)
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{
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if (addr_v6 == Poco::Net::IPAddress(
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&reinterpret_cast<sockaddr_in6*>(ai->ai_addr)->sin6_addr, sizeof(in6_addr),
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reinterpret_cast<sockaddr_in6*>(ai->ai_addr)->sin6_scope_id))
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{
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return true;
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}
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}
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else if (ai->ai_family == AF_INET)
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{
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if (addr_v6 == toIPv6(Poco::Net::IPAddress(
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&reinterpret_cast<sockaddr_in*>(ai->ai_addr)->sin_addr, sizeof(in_addr))))
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{
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return true;
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}
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}
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}
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}
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}
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catch (...)
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{
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freeaddrinfo(ai);
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throw;
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}
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freeaddrinfo(ai);
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return false;
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}
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public:
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HostExactPattern(const String & host_) : host(host_) {}
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bool contains(const Poco::Net::IPAddress & addr) const
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{
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static SimpleCache<decltype(containsImpl), &containsImpl> cache;
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return cache(host, addr);
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}
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};
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/// Проверяет соответствие PTR-записи для адреса регекспу (и дополнительно проверяет, что PTR-запись резолвится обратно в адрес клиента).
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class HostRegexpPattern : public IAddressPattern
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{
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private:
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Poco::RegularExpression host_regexp;
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static String getDomain(const Poco::Net::IPAddress & addr)
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{
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Poco::Net::SocketAddress sock_addr(addr, 0);
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/// Резолвим вручную, потому что в Poco нет такой функциональности.
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char domain[1024];
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int gai_errno = getnameinfo(sock_addr.addr(), sock_addr.length(), domain, sizeof(domain), nullptr, 0, NI_NAMEREQD);
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if (0 != gai_errno)
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throw Exception("Cannot getnameinfo: " + std::string(gai_strerror(gai_errno)), ErrorCodes::DNS_ERROR);
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return domain;
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}
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public:
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HostRegexpPattern(const String & host_regexp_) : host_regexp(host_regexp_) {}
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bool contains(const Poco::Net::IPAddress & addr) const
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{
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static SimpleCache<decltype(getDomain), &getDomain> cache;
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String domain = cache(addr);
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Poco::RegularExpression::Match match;
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if (host_regexp.match(domain, match) && HostExactPattern(domain).contains(addr))
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return true;
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return false;
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}
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};
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class AddressPatterns
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{
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private:
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using Container = std::vector<std::unique_ptr<IAddressPattern>>;
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Container patterns;
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public:
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bool contains(const Poco::Net::IPAddress & addr) const
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{
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for (size_t i = 0, size = patterns.size(); i < size; ++i)
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{
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/// если хост не резолвится, то пропустим его и попробуем другой
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try
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{
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if (patterns[i]->contains(addr))
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return true;
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}
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catch (const DB::Exception & e)
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{
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LOG_WARNING(&Logger::get("AddressPatterns"),
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"Failed to check if pattern contains address " << addr.toString() << ". " << e.displayText() << ", code = " << e.code());
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if (e.code() == ErrorCodes::DNS_ERROR)
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{
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continue;
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}
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else
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throw;
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}
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}
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return false;
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}
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void addFromConfig(const String & config_elem, Poco::Util::AbstractConfiguration & config)
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{
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Poco::Util::AbstractConfiguration::Keys config_keys;
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config.keys(config_elem, config_keys);
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for (Poco::Util::AbstractConfiguration::Keys::const_iterator it = config_keys.begin(); it != config_keys.end(); ++it)
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{
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Container::value_type pattern;
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String value = config.getString(config_elem + "." + *it);
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if (startsWith(*it, "ip"))
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pattern.reset(new IPAddressPattern(value));
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else if (startsWith(*it, "host_regexp"))
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pattern.reset(new HostRegexpPattern(value));
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else if (startsWith(*it, "host"))
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pattern.reset(new HostExactPattern(value));
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else
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throw Exception("Unknown address pattern type: " + *it, ErrorCodes::UNKNOWN_ADDRESS_PATTERN_TYPE);
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patterns.emplace_back(std::move(pattern));
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}
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}
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};
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/** Пользователь и ACL.
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*/
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struct User
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{
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String name;
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/// Требуемый пароль. Может храниться либо в открытом виде, либо в виде SHA256.
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String password;
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String password_sha256_hex;
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String profile;
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String quota;
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AddressPatterns addresses;
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/// Список разрешённых баз данных.
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using DatabaseSet = std::unordered_set<std::string>;
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DatabaseSet databases;
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User(const String & name_, const String & config_elem, Poco::Util::AbstractConfiguration & config)
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: name(name_)
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{
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bool has_password = config.has(config_elem + ".password");
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bool has_password_sha256_hex = config.has(config_elem + ".password_sha256_hex");
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if (has_password && has_password_sha256_hex)
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throw Exception("Both fields 'password' and 'password_sha256_hex' are specified for user " + name + ". Must be only one of them.", ErrorCodes::BAD_ARGUMENTS);
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if (!has_password && !has_password_sha256_hex)
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throw Exception("Either 'password' or 'password_sha256_hex' must be specified for user " + name + ".", ErrorCodes::BAD_ARGUMENTS);
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if (has_password)
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password = config.getString(config_elem + ".password");
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if (has_password_sha256_hex)
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{
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password_sha256_hex = Poco::toLower(config.getString(config_elem + ".password_sha256_hex"));
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if (password_sha256_hex.size() != 64)
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throw Exception("password_sha256_hex for user " + name + " has length " + toString(password_sha256_hex.size()) + " but must be exactly 64 symbols.", ErrorCodes::BAD_ARGUMENTS);
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}
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profile = config.getString(config_elem + ".profile");
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quota = config.getString(config_elem + ".quota");
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addresses.addFromConfig(config_elem + ".networks", config);
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/// Заполнить список разрешённых баз данных.
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const auto config_sub_elem = config_elem + ".allow_databases";
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if (config.has(config_sub_elem))
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{
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Poco::Util::AbstractConfiguration::Keys config_keys;
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config.keys(config_sub_elem, config_keys);
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databases.reserve(config_keys.size());
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for (const auto & key : config_keys)
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{
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const auto database_name = config.getString(config_sub_elem + "." + key);
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databases.insert(database_name);
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}
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}
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}
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/// Для вставки в контейнер.
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User() {}
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};
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/// Известные пользователи.
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class Users
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{
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private:
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using Container = std::map<String, User>;
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Container cont;
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public:
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void loadFromConfig(Poco::Util::AbstractConfiguration & config)
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{
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cont.clear();
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Poco::Util::AbstractConfiguration::Keys config_keys;
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config.keys("users", config_keys);
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for (Poco::Util::AbstractConfiguration::Keys::const_iterator it = config_keys.begin(); it != config_keys.end(); ++it)
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cont[*it] = User(*it, "users." + *it, config);
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}
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const User & get(const String & name, const String & password, const Poco::Net::IPAddress & address) const
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{
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Container::const_iterator it = cont.find(name);
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if (cont.end() == it)
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throw Exception("Unknown user " + name, ErrorCodes::UNKNOWN_USER);
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if (!it->second.addresses.contains(address))
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throw Exception("User " + name + " is not allowed to connect from address " + address.toString(), ErrorCodes::IP_ADDRESS_NOT_ALLOWED);
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auto on_wrong_password = [&]()
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{
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if (password.empty())
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throw Exception("Password required for user " + name, ErrorCodes::REQUIRED_PASSWORD);
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else
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throw Exception("Wrong password for user " + name, ErrorCodes::WRONG_PASSWORD);
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};
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if (!it->second.password_sha256_hex.empty())
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{
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unsigned char hash[32];
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SHA256_CTX ctx;
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SHA256_Init(&ctx);
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SHA256_Update(&ctx, reinterpret_cast<const unsigned char *>(password.data()), password.size());
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SHA256_Final(hash, &ctx);
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String hash_hex;
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{
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WriteBufferFromString buf(hash_hex);
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HexWriteBuffer hex_buf(buf);
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hex_buf.write(reinterpret_cast<const char *>(hash), sizeof(hash));
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}
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Poco::toLowerInPlace(hash_hex);
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if (hash_hex != it->second.password_sha256_hex)
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on_wrong_password();
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}
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else if (password != it->second.password)
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{
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on_wrong_password();
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}
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return it->second;
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}
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/// Проверить, имеет ли заданный клиент доступ к заданной базе данных.
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bool isAllowedDatabase(const std::string & user_name, const std::string & database_name) const
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{
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auto it = cont.find(user_name);
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if (it == cont.end())
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throw Exception("Unknown user " + user_name, ErrorCodes::UNKNOWN_USER);
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const auto & user = it->second;
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return user.databases.empty() || user.databases.count(database_name);
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}
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};
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}
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