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Merge pull request #8544 from Icinga/feature/icingadb-tls

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Icinga DB: support TLS
This commit is contained in:
Alexander Aleksandrovič Klimov 2021-07-26 15:50:52 +02:00 committed by GitHub
commit 9684fe8141
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GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 227 additions and 64 deletions
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8
doc/09-object-types.md
View File

@ -1410,6 +1410,14 @@ Configuration Attributes:
port | Number | **Optional.** Redis port for IcingaDB. Defaults to `6380`.
path | String | **Optional.** Redix unix socket path. Can be used instead of `host` and `port` attributes.
password | String | **Optional.** Redis auth password for IcingaDB.
enable\_tls | Boolean | **Optional.** Whether to use TLS.
cert\_path | String | **Optional.** Path to the certificate.
key\_path | String | **Optional.** Path to the private key.
ca\_path | String | **Optional.** Path to the CA certificate to use instead of the system's root CAs.
crl\_path | String | **Optional.** Path to the CRL file.
cipher\_list | String | **Optional.** Cipher list that is allowed. For a list of available ciphers run `openssl ciphers`. Defaults to `ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384:AES128-GCM-SHA256`.
tls\_protocolmin | String | **Optional.** Minimum TLS protocol version. Defaults to `TLSv1.2`.
insecure\_noverify | Boolean | **Optional.** Whether not to verify the peer.
### IdoMySqlConnection <a id="objecttype-idomysqlconnection"></a>

58
lib/base/tlsutility.cpp
View File

@ -70,7 +70,7 @@ void InitializeOpenSSL()
l_SSLInitialized = true;
}
static void SetupSslContext(const Shared<boost::asio::ssl::context>::Ptr& context, const String& pubkey, const String& privkey, const String& cakey)
static void InitSslContext(const Shared<boost::asio::ssl::context>::Ptr& context, const String& pubkey, const String& privkey, const String& cakey)
{
char errbuf[256];
@ -137,7 +137,16 @@ static void SetupSslContext(const Shared<boost::asio::ssl::context>::Ptr& contex
}
}
if (!cakey.IsEmpty()) {
if (cakey.IsEmpty()) {
if (!SSL_CTX_set_default_verify_paths(sslContext)) {
ERR_error_string_n(ERR_peek_error(), errbuf, sizeof errbuf);
Log(LogCritical, "SSL")
<< "Error loading system's root CAs: " << ERR_peek_error() << ", \"" << errbuf << "\"";
BOOST_THROW_EXCEPTION(openssl_error()
<< boost::errinfo_api_function("SSL_CTX_set_default_verify_paths")
<< errinfo_openssl_error(ERR_peek_error()));
}
} else {
if (!SSL_CTX_load_verify_locations(sslContext, cakey.CStr(), nullptr)) {
ERR_error_string_n(ERR_peek_error(), errbuf, sizeof errbuf);
Log(LogCritical, "SSL")
@ -181,7 +190,7 @@ Shared<boost::asio::ssl::context>::Ptr MakeAsioSslContext(const String& pubkey,
auto context (Shared<ssl::context>::Make(ssl::context::tls));
SetupSslContext(context, pubkey, privkey, cakey);
InitSslContext(context, pubkey, privkey, cakey);
return context;
}
@ -249,6 +258,49 @@ int ResolveTlsProtocolVersion(const std::string& version) {
}
}
Shared<boost::asio::ssl::context>::Ptr SetupSslContext(String certPath, String keyPath,
String caPath, String crlPath, String cipherList, String protocolmin, DebugInfo di)
{
namespace ssl = boost::asio::ssl;
Shared<ssl::context>::Ptr context;
try {
context = MakeAsioSslContext(certPath, keyPath, caPath);
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot make SSL context for cert path: '"
+ certPath + "' key path: '" + keyPath + "' ca path: '" + caPath + "'.", di));
}
if (!crlPath.IsEmpty()) {
try {
AddCRLToSSLContext(context, crlPath);
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot add certificate revocation list to SSL context for crl path: '"
+ crlPath + "'.", di));
}
}
if (!cipherList.IsEmpty()) {
try {
SetCipherListToSSLContext(context, cipherList);
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot set cipher list to SSL context for cipher list: '"
+ cipherList + "'.", di));
}
}
if (!protocolmin.IsEmpty()){
try {
SetTlsProtocolminToSSLContext(context, protocolmin);
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot set minimum TLS protocol version to SSL context with tls_protocolmin: '" + protocolmin + "'.", di));
}
}
return std::move(context);
}
/**
* Set the minimum TLS protocol version to the specified SSL context.
*

8
lib/base/tlsutility.hpp
View File

@ -4,6 +4,7 @@
#define TLSUTILITY_H
#include "base/i2-base.hpp"
#include "base/debuginfo.hpp"
#include "base/object.hpp"
#include "base/shared.hpp"
#include "base/array.hpp"
@ -24,6 +25,10 @@
namespace icinga
{
const char * const DEFAULT_TLS_CIPHERS = "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384:AES128-GCM-SHA256";
const char * const DEFAULT_TLS_PROTOCOLMIN = "TLSv1.2";
void InitializeOpenSSL();
String GetOpenSSLVersion();
@ -35,6 +40,9 @@ void SetCipherListToSSLContext(const Shared<boost::asio::ssl::context>::Ptr& con
void SetTlsProtocolminToSSLContext(const Shared<boost::asio::ssl::context>::Ptr& context, const String& tlsProtocolmin);
int ResolveTlsProtocolVersion(const std::string& version);
Shared<boost::asio::ssl::context>::Ptr SetupSslContext(String certPath, String keyPath,
String caPath, String crlPath, String cipherList, String protocolmin, DebugInfo di);
String GetCertificateCN(const std::shared_ptr<X509>& certificate);
std::shared_ptr<X509> GetX509Certificate(const String& pemfile);
int MakeX509CSR(const String& cn, const String& keyfile, const String& csrfile = String(), const String& certfile = String(), bool ca = false);

31
lib/icingadb/icingadb.cpp
View File

@ -33,6 +33,18 @@ IcingaDB::IcingaDB()
m_PrefixConfigCheckSum = "icinga:checksum:";
}
void IcingaDB::Validate(int types, const ValidationUtils& utils)
{
ObjectImpl<IcingaDB>::Validate(types, utils);
if (!(types & FAConfig))
return;
if (GetEnableTls() && GetCertPath().IsEmpty() != GetKeyPath().IsEmpty()) {
BOOST_THROW_EXCEPTION(ValidationError(this, std::vector<String>(), "Validation failed: Either both a client certificate (cert_path) and its private key (key_path) or none of them must be given."));
}
}
/**
* Starts the component.
*/
@ -52,7 +64,9 @@ void IcingaDB::Start(bool runtimeCreated)
m_WorkQueue.SetExceptionCallback([this](boost::exception_ptr exp) { ExceptionHandler(std::move(exp)); });
m_Rcon = new RedisConnection(GetHost(), GetPort(), GetPath(), GetPassword(), GetDbIndex());
m_Rcon = new RedisConnection(GetHost(), GetPort(), GetPath(), GetPassword(), GetDbIndex(),
GetEnableTls(), GetInsecureNoverify(), GetCertPath(), GetKeyPath(), GetCaPath(), GetCrlPath(),
GetTlsProtocolmin(), GetCipherList(), GetDebugInfo());
m_Rcon->SetConnectedCallback([this](boost::asio::yield_context& yc) {
m_WorkQueue.Enqueue([this]() { OnConnectedHandler(); });
});
@ -63,7 +77,9 @@ void IcingaDB::Start(bool runtimeCreated)
if (!ctype)
continue;
RedisConnection::Ptr rCon (new RedisConnection(GetHost(), GetPort(), GetPath(), GetPassword(), GetDbIndex(), m_Rcon));
RedisConnection::Ptr rCon (new RedisConnection(GetHost(), GetPort(), GetPath(), GetPassword(), GetDbIndex(),
GetEnableTls(), GetInsecureNoverify(), GetCertPath(), GetKeyPath(), GetCaPath(), GetCrlPath(),
GetTlsProtocolmin(), GetCipherList(), GetDebugInfo(), m_Rcon));
rCon->Start();
m_Rcons[ctype] = std::move(rCon);
}
@ -140,6 +156,17 @@ void IcingaDB::Stop(bool runtimeRemoved)
ObjectImpl<IcingaDB>::Stop(runtimeRemoved);
}
void IcingaDB::ValidateTlsProtocolmin(const Lazy<String>& lvalue, const ValidationUtils& utils)
{
ObjectImpl<IcingaDB>::ValidateTlsProtocolmin(lvalue, utils);
try {
ResolveTlsProtocolVersion(lvalue());
} catch (const std::exception& ex) {
BOOST_THROW_EXCEPTION(ValidationError(this, { "tls_protocolmin" }, ex.what()));
}
}
void IcingaDB::AssertOnWorkQueue()
{
ASSERT(m_WorkQueue.IsWorkerThread());

4
lib/icingadb/icingadb.hpp
View File

@ -35,9 +35,13 @@ public:
static void ConfigStaticInitialize();
void Validate(int types, const ValidationUtils& utils) override;
virtual void Start(bool runtimeCreated) override;
virtual void Stop(bool runtimeRemoved) override;
protected:
void ValidateTlsProtocolmin(const Lazy<String>& lvalue, const ValidationUtils& utils) override;
private:
class DumpedGlobals
{

20
lib/icingadb/icingadb.ti
View File

@ -1,6 +1,7 @@
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
#include "base/configobject.hpp"
#include "base/tlsutility.hpp"
library icingadb;
@ -20,6 +21,25 @@ class IcingaDB : ConfigObject
[config] String path;
[config, no_user_view, no_user_modify] String password;
[config] int db_index;
[config] bool enable_tls {
default {{{ return false; }}}
};
[config] bool insecure_noverify {
default {{{ return false; }}}
};
[config] String cert_path;
[config] String key_path;
[config] String ca_path;
[config] String crl_path;
[config] String cipher_list {
default {{{ return DEFAULT_TLS_CIPHERS; }}}
};
[config] String tls_protocolmin {
default {{{ return DEFAULT_TLS_PROTOCOLMIN; }}}
};
};
}

92
lib/icingadb/redisconnection.cpp
View File

@ -4,11 +4,13 @@
#include "base/array.hpp"
#include "base/convert.hpp"
#include "base/defer.hpp"
#include "base/exception.hpp"
#include "base/io-engine.hpp"
#include "base/logger.hpp"
#include "base/objectlock.hpp"
#include "base/string.hpp"
#include "base/tcpsocket.hpp"
#include "base/tlsutility.hpp"
#include "base/utility.hpp"
#include <boost/asio.hpp>
#include <boost/coroutine/exceptions.hpp>
@ -19,23 +21,39 @@
#include <future>
#include <iterator>
#include <memory>
#include <openssl/ssl.h>
#include <openssl/x509_vfy.h>
#include <utility>
using namespace icinga;
namespace asio = boost::asio;
RedisConnection::RedisConnection(const String& host, const int port, const String& path,
const String& password, const int db, const RedisConnection::Ptr& parent) :
RedisConnection(IoEngine::Get().GetIoContext(), host, port, path, password, db, parent)
RedisConnection::RedisConnection(const String& host, int port, const String& path, const String& password, int db,
bool useTls, bool insecure, const String& certPath, const String& keyPath, const String& caPath, const String& crlPath,
const String& tlsProtocolmin, const String& cipherList, DebugInfo di, const RedisConnection::Ptr& parent)
: RedisConnection(IoEngine::Get().GetIoContext(), host, port, path, password, db,
useTls, insecure, certPath, keyPath, caPath, crlPath, tlsProtocolmin, cipherList, std::move(di), parent)
{
}
RedisConnection::RedisConnection(boost::asio::io_context& io, String host, int port, String path,
String password, int db, const RedisConnection::Ptr& parent)
: m_Host(std::move(host)), m_Port(port), m_Path(std::move(path)), m_Password(std::move(password)), m_DbIndex(db),
m_Connecting(false), m_Connected(false), m_Started(false), m_Strand(io),
m_QueuedWrites(io), m_QueuedReads(io), m_LogStatsTimer(io), m_Parent(parent)
RedisConnection::RedisConnection(boost::asio::io_context& io, String host, int port, String path, String password,
int db, bool useTls, bool insecure, String certPath, String keyPath, String caPath, String crlPath,
String tlsProtocolmin, String cipherList, DebugInfo di, const RedisConnection::Ptr& parent)
: m_Host(std::move(host)), m_Port(port), m_Path(std::move(path)), m_Password(std::move(password)),
m_DbIndex(db), m_CertPath(std::move(certPath)), m_KeyPath(std::move(keyPath)), m_Insecure(insecure),
m_CaPath(std::move(caPath)), m_CrlPath(std::move(crlPath)), m_TlsProtocolmin(std::move(tlsProtocolmin)),
m_CipherList(std::move(cipherList)), m_DebugInfo(std::move(di)), m_Connecting(false), m_Connected(false),
m_Started(false), m_Strand(io), m_QueuedWrites(io), m_QueuedReads(io), m_LogStatsTimer(io), m_Parent(parent)
{
if (useTls && m_Path.IsEmpty()) {
UpdateTLSContext();
}
}
void RedisConnection::UpdateTLSContext()
{
m_TLSContext = SetupSslContext(m_CertPath, m_KeyPath, m_CaPath,
m_CrlPath, m_CipherList, m_TlsProtocolmin, m_DebugInfo);
}
void RedisConnection::Start()
@ -245,12 +263,48 @@ void RedisConnection::Connect(asio::yield_context& yc)
for (;;) {
try {
if (m_Path.IsEmpty()) {
Log(m_Parent ? LogNotice : LogInformation, "IcingaDB")
<< "Trying to connect to Redis server (async) on host '" << m_Host << ":" << m_Port << "'";
if (m_TLSContext) {
Log(m_Parent ? LogNotice : LogInformation, "IcingaDB")
<< "Trying to connect to Redis server (async, TLS) on host '" << m_Host << ":" << m_Port << "'";
auto conn (Shared<TcpConn>::Make(m_Strand.context()));
icinga::Connect(conn->next_layer(), m_Host, Convert::ToString(m_Port), yc);
m_TcpConn = std::move(conn);
auto conn (Shared<AsioTlsStream>::Make(m_Strand.context(), *m_TLSContext, m_Host));
auto& tlsConn (conn->next_layer());
if (!m_Insecure) {
auto native (tlsConn.native_handle());
X509_VERIFY_PARAM_set1_host(SSL_get0_param(native), m_Host.CStr(), 0);
SSL_set_verify(native, SSL_VERIFY_PEER, NULL);
}
icinga::Connect(conn->lowest_layer(), m_Host, Convert::ToString(m_Port), yc);
tlsConn.async_handshake(tlsConn.client, yc);
if (!m_Insecure) {
std::shared_ptr<X509> cert (tlsConn.GetPeerCertificate());
if (!cert) {
BOOST_THROW_EXCEPTION(std::runtime_error(
"Redis didn't present any TLS certificate."
));
}
if (!tlsConn.IsVerifyOK()) {
BOOST_THROW_EXCEPTION(std::runtime_error(
"TLS certificate validation failed: " + std::string(tlsConn.GetVerifyError())
));
}
}
m_TlsConn = std::move(conn);
} else {
Log(m_Parent ? LogNotice : LogInformation, "IcingaDB")
<< "Trying to connect to Redis server (async) on host '" << m_Host << ":" << m_Port << "'";
auto conn (Shared<TcpConn>::Make(m_Strand.context()));
icinga::Connect(conn->next_layer(), m_Host, Convert::ToString(m_Port), yc);
m_TcpConn = std::move(conn);
}
} else {
Log(LogInformation, "IcingaDB")
<< "Trying to connect to Redis server (async) on unix socket path '" << m_Path << "'";
@ -560,7 +614,11 @@ void RedisConnection::WriteItem(boost::asio::yield_context& yc, RedisConnection:
RedisConnection::Reply RedisConnection::ReadOne(boost::asio::yield_context& yc)
{
if (m_Path.IsEmpty()) {
return ReadOne(m_TcpConn, yc);
if (m_TLSContext) {
return ReadOne(m_TlsConn, yc);
} else {
return ReadOne(m_TcpConn, yc);
}
} else {
return ReadOne(m_UnixConn, yc);
}
@ -574,7 +632,11 @@ RedisConnection::Reply RedisConnection::ReadOne(boost::asio::yield_context& yc)
void RedisConnection::WriteOne(RedisConnection::Query& query, asio::yield_context& yc)
{
if (m_Path.IsEmpty()) {
WriteOne(m_TcpConn, query, yc);
if (m_TLSContext) {
WriteOne(m_TlsConn, query, yc);
} else {
WriteOne(m_TcpConn, query, yc);
}
} else {
WriteOne(m_UnixConn, query, yc);
}

26
lib/icingadb/redisconnection.hpp
View File

@ -10,6 +10,7 @@
#include "base/ringbuffer.hpp"
#include "base/shared.hpp"
#include "base/string.hpp"
#include "base/tlsstream.hpp"
#include "base/value.hpp"
#include <boost/asio/buffer.hpp>
#include <boost/asio/buffered_stream.hpp>
@ -20,6 +21,7 @@
#include <boost/asio/local/stream_protocol.hpp>
#include <boost/asio/read.hpp>
#include <boost/asio/read_until.hpp>
#include <boost/asio/ssl/context.hpp>
#include <boost/asio/streambuf.hpp>
#include <boost/asio/write.hpp>
#include <boost/lexical_cast.hpp>
@ -69,8 +71,11 @@ namespace icinga
SyncConnection = 255
};
RedisConnection(const String& host, const int port, const String& path,
const String& password = "", const int db = 0, const Ptr& parent = nullptr);
RedisConnection(const String& host, int port, const String& path, const String& password, int db,
bool useTls, bool insecure, const String& certPath, const String& keyPath, const String& caPath, const String& crlPath,
const String& tlsProtocolmin, const String& cipherList, DebugInfo di, const Ptr& parent = nullptr);
void UpdateTLSContext();
void Start();
@ -134,6 +139,8 @@ namespace icinga
typedef boost::asio::buffered_stream<Tcp::socket> TcpConn;
typedef boost::asio::buffered_stream<Unix::socket> UnixConn;
Shared<boost::asio::ssl::context>::Ptr m_TLSContext;
template<class AsyncReadStream>
static Value ReadRESP(AsyncReadStream& stream, boost::asio::yield_context& yc);
@ -143,8 +150,9 @@ namespace icinga
template<class AsyncWriteStream>
static void WriteRESP(AsyncWriteStream& stream, const Query& query, boost::asio::yield_context& yc);
RedisConnection(boost::asio::io_context& io, String host, int port, String path,
String password, int db, const Ptr& parent);
RedisConnection(boost::asio::io_context& io, String host, int port, String path, String password,
int db, bool useTls, bool insecure, String certPath, String keyPath, String caPath, String crlPath,
String tlsProtocolmin, String cipherList, DebugInfo di, const Ptr& parent);
void Connect(boost::asio::yield_context& yc);
void ReadLoop(boost::asio::yield_context& yc);
@ -169,9 +177,19 @@ namespace icinga
String m_Password;
int m_DbIndex;
String m_CertPath;
String m_KeyPath;
bool m_Insecure;
String m_CaPath;
String m_CrlPath;
String m_TlsProtocolmin;
String m_CipherList;
DebugInfo m_DebugInfo;
boost::asio::io_context::strand m_Strand;
Shared<TcpConn>::Ptr m_TcpConn;
Shared<UnixConn>::Ptr m_UnixConn;
Shared<AsioTlsStream>::Ptr m_TlsConn;
Atomic<bool> m_Connecting, m_Connected, m_Started;
struct {

39
lib/remote/apilistener.cpp
View File

@ -181,44 +181,7 @@ void ApiListener::OnConfigLoaded()
void ApiListener::UpdateSSLContext()
{
namespace ssl = boost::asio::ssl;
Shared<ssl::context>::Ptr context;
try {
context = MakeAsioSslContext(GetDefaultCertPath(), GetDefaultKeyPath(), GetDefaultCaPath());
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot make SSL context for cert path: '"
+ GetDefaultCertPath() + "' key path: '" + GetDefaultKeyPath() + "' ca path: '" + GetDefaultCaPath() + "'.", GetDebugInfo()));
}
if (!GetCrlPath().IsEmpty()) {
try {
AddCRLToSSLContext(context, GetCrlPath());
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot add certificate revocation list to SSL context for crl path: '"
+ GetCrlPath() + "'.", GetDebugInfo()));
}
}
if (!GetCipherList().IsEmpty()) {
try {
SetCipherListToSSLContext(context, GetCipherList());
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot set cipher list to SSL context for cipher list: '"
+ GetCipherList() + "'.", GetDebugInfo()));
}
}
if (!GetTlsProtocolmin().IsEmpty()){
try {
SetTlsProtocolminToSSLContext(context, GetTlsProtocolmin());
} catch (const std::exception&) {
BOOST_THROW_EXCEPTION(ScriptError("Cannot set minimum TLS protocol version to SSL context with tls_protocolmin: '" + GetTlsProtocolmin() + "'.", GetDebugInfo()));
}
}
m_SSLContext = context;
m_SSLContext = SetupSslContext(GetDefaultCertPath(), GetDefaultKeyPath(), GetDefaultCaPath(), GetCrlPath(), GetCipherList(), GetTlsProtocolmin(), GetDebugInfo());
for (const Endpoint::Ptr& endpoint : ConfigType::GetObjectsByType<Endpoint>()) {
for (const JsonRpcConnection::Ptr& client : endpoint->GetClients()) {

5
lib/remote/apilistener.ti
View File

@ -3,6 +3,7 @@
#include "remote/i2-remote.hpp"
#include "base/configobject.hpp"
#include "base/application.hpp"
#include "base/tlsutility.hpp"
library remote;
@ -18,10 +19,10 @@ class ApiListener : ConfigObject
[config, deprecated] String ca_path;
[config] String crl_path;
[config] String cipher_list {
default {{{ return "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:AES256-GCM-SHA384:AES128-GCM-SHA256"; }}}
default {{{ return DEFAULT_TLS_CIPHERS; }}}
};
[config] String tls_protocolmin {
default {{{ return "TLSv1.2"; }}}
default {{{ return DEFAULT_TLS_PROTOCOLMIN; }}}
};
[config] String bind_host {