ClickHouse/dbms/include/DB/Interpreters/Users.h

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