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cliopt.hpp
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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
// These classes encapsulate the basic setup of the various objects needed to
// create an OpenVPN client session. The basic idea here is to look at both
// compile time settings (i.e. crypto/SSL/random libraries), and run-time
// (such as transport layer using UDP, TCP, or HTTP-proxy), and
// build the actual objects that will be used to construct a client session.
#ifndef OPENVPN_CLIENT_CLIOPT_H
#define OPENVPN_CLIENT_CLIOPT_H
#include <string>
#include <tuple>
#include <unordered_set>
#include <map>
#include <set>
#include <openvpn/error/excode.hpp>
#include <openvpn/common/size.hpp>
#include <openvpn/common/platform.hpp>
#include <openvpn/common/options.hpp>
#include <openvpn/common/stop.hpp>
#include <openvpn/frame/frame_init.hpp>
#include <openvpn/pki/epkibase.hpp>
#include <openvpn/crypto/cryptodcsel.hpp>
#include <openvpn/random/mtrandapi.hpp>
#include <openvpn/ssl/mssparms.hpp>
#include <openvpn/tun/tunmtu.hpp>
#include <openvpn/tun/tristate_setting.hpp>
#include <openvpn/netconf/hwaddr.hpp>
#include <openvpn/transport/socket_protect.hpp>
#include <openvpn/transport/reconnect_notify.hpp>
#include <openvpn/transport/client/udpcli.hpp>
#include <openvpn/transport/client/tcpcli.hpp>
#include <openvpn/transport/client/httpcli.hpp>
#include <openvpn/transport/altproxy.hpp>
#include <openvpn/transport/dco.hpp>
#include <openvpn/client/cliproto.hpp>
#include <openvpn/client/cliopthelper.hpp>
#include <openvpn/client/optfilt.hpp>
#include <openvpn/client/clilife.hpp>
#include <openvpn/ssl/sslchoose.hpp>
#ifdef OPENVPN_GREMLIN
#include <openvpn/transport/gremlin.hpp>
#endif
#if defined(OPENVPN_PLATFORM_ANDROID)
#include <openvpn/client/cliemuexr.hpp>
#endif
#if defined(OPENVPN_EXTERNAL_TRANSPORT_FACTORY)
#include <openvpn/transport/client/extern/config.hpp>
#include <openvpn/transport/client/extern/fw.hpp>
#endif
#if defined(OPENVPN_EXTERNAL_TUN_FACTORY)
// requires that client implements ExternalTun::Factory::new_tun_factory
#include <openvpn/tun/extern/config.hpp>
#elif defined(USE_TUN_BUILDER)
#include <openvpn/tun/builder/client.hpp>
#elif defined(OPENVPN_PLATFORM_LINUX) && !defined(OPENVPN_FORCE_TUN_NULL)
#include <openvpn/tun/linux/client/tuncli.hpp>
#ifdef OPENVPN_COMMAND_AGENT
#include <openvpn/client/unix/cmdagent.hpp>
#endif
#elif defined(OPENVPN_PLATFORM_MAC) && !defined(OPENVPN_FORCE_TUN_NULL)
#include <openvpn/tun/mac/client/tuncli.hpp>
#include <openvpn/apple/maclife.hpp>
#ifdef OPENVPN_COMMAND_AGENT
#include <openvpn/client/unix/cmdagent.hpp>
#endif
#elif defined(OPENVPN_PLATFORM_WIN) && !defined(OPENVPN_FORCE_TUN_NULL)
#include <openvpn/tun/win/client/tuncli.hpp>
#ifdef OPENVPN_COMMAND_AGENT
#include <openvpn/client/win/cmdagent.hpp>
#endif
#else
#include <openvpn/tun/client/tunnull.hpp>
#endif
#ifdef PRIVATE_TUNNEL_PROXY
#include <openvpn/pt/ptproxy.hpp>
#endif
#if defined(ENABLE_KOVPN) || defined(ENABLE_OVPNDCO) || defined(ENABLE_OVPNDCOWIN)
#include <openvpn/dco/dcocli.hpp>
#endif
#ifndef OPENVPN_UNUSED_OPTIONS
#define OPENVPN_UNUSED_OPTIONS "UNKNOWN/UNSUPPORTED OPTIONS"
#endif
namespace openvpn {
struct ClientConfigParsed : public ClientAPI::ConfigCommon
{
/**
* Imports the settings from the UI set ClientAPI::Config
* into this class.
*/
void import_client_settings(const ClientAPI::Config &config)
{
/* explicitly allow slicing to only copy the settings that
* are in the common base class \c ConfigCommon */
ClientAPI::ConfigCommon::operator=(config);
if (!config.protoOverride.empty())
proto_override = Protocol::parse(config.protoOverride, Protocol::NO_SUFFIX);
if (config.protoVersionOverride == 4)
proto_version_override = IP::Addr::Version::V4;
else if (config.protoVersionOverride == 6)
proto_version_override = IP::Addr::Version::V6;
if (!config.allowUnusedAddrFamilies.empty())
allowUnusedAddrFamilies = TriStateSetting::parse(config.allowUnusedAddrFamilies);
}
IP::Addr::Version proto_version_override = IP::Addr::Version::UNSPEC;
Protocol proto_override;
TriStateSetting allowUnusedAddrFamilies;
/* from eval config */
std::string external_pki_alias;
};
class ClientOptions : public RC<thread_unsafe_refcount>
{
public:
typedef RCPtr<ClientOptions> Ptr;
typedef ClientProto::Session Client;
struct Config
{
/* Options set by the client application.
* This class only uses a subset. For simplicity
* we keep all client settings here instead of creating a new
* subset class of configuration options */
ClientConfigParsed clientconf;
int conn_timeout = 0;
SessionStats::Ptr cli_stats;
ClientEvent::Queue::Ptr cli_events;
ProtoContextCompressionOptions::Ptr proto_context_options;
HTTPProxyTransport::Options::Ptr http_proxy_options;
bool alt_proxy = false;
bool synchronous_dns_lookup = false;
int default_key_direction = -1;
PeerInfo::Set::Ptr extra_peer_info;
#ifdef OPENVPN_PLATFORM_ANDROID
bool enable_route_emulation = true;
#endif
#ifdef OPENVPN_GREMLIN
Gremlin::Config::Ptr gremlin_config;
#endif
Stop *stop = nullptr;
// callbacks -- must remain in scope for lifetime of ClientOptions object
ExternalPKIBase *external_pki = nullptr;
SocketProtect *socket_protect = nullptr;
ReconnectNotify *reconnect_notify = nullptr;
RemoteList::RemoteOverride *remote_override = nullptr;
#if defined(USE_TUN_BUILDER)
TunBuilderBase *builder = nullptr;
#endif
#if defined(OPENVPN_EXTERNAL_TUN_FACTORY)
ExternalTun::Factory *extern_tun_factory = nullptr;
#endif
#if defined(OPENVPN_EXTERNAL_TRANSPORT_FACTORY)
ExternalTransport::Factory *extern_transport_factory = nullptr;
#endif
};
ClientOptions(const OptionList &opt, // only needs to remain in scope for duration of constructor call
const Config &config)
: clientconf(config.clientconf),
server_addr_float(false),
socket_protect(config.socket_protect),
reconnect_notify(config.reconnect_notify),
cli_stats(config.cli_stats),
cli_events(config.cli_events),
server_poll_timeout_(10),
tcp_queue_limit(64),
proto_context_options(config.proto_context_options),
http_proxy_options(config.http_proxy_options),
autologin(false),
autologin_sessions(false),
creds_locked(false),
asio_work_always_on_(false),
synchronous_dns_lookup(false)
#ifdef OPENVPN_EXTERNAL_TRANSPORT_FACTORY
,
extern_transport_factory(config.extern_transport_factory)
#endif
{
// parse general client options
const ParseClientConfig pcc(opt);
// creds
userlocked_username = pcc.userlockedUsername();
autologin = pcc.autologin();
autologin_sessions = (autologin && clientconf.autologinSessions);
// digest factory
DigestFactory::Ptr digest_factory(new CryptoDigestFactory<SSLLib::CryptoAPI>());
// initialize RNG/PRNG
rng.reset(new SSLLib::RandomAPI());
prng.reset(new MTRand(time(nullptr)));
// frame
// get tun-mtu and tun-mtu-max parameter from config
const unsigned int tun_mtu = parse_tun_mtu(opt, 0);
const unsigned int tun_mtu_max = std::max(parse_tun_mtu_max(opt, TUN_MTU_DEFAULT + 100), tun_mtu);
const MSSCtrlParms mc(opt);
frame = frame_init(true, tun_mtu_max, mc.mssfix_ctrl, true);
// TCP queue limit
tcp_queue_limit = opt.get_num<decltype(tcp_queue_limit)>("tcp-queue-limit", 1, tcp_queue_limit, 1, 65536);
// route-nopull
pushed_options_filter.reset(new PushedOptionsFilter(opt));
// OpenVPN Protocol context (including SSL)
cp_main = proto_config(opt, config, pcc, false);
cp_relay = proto_config(opt, config, pcc, true); // may be null
CryptoAlgs::allow_default_dc_algs<SSLLib::CryptoAPI>(cp_main->ssl_factory->libctx(),
!config.clientconf.enableNonPreferredDCAlgorithms,
config.clientconf.enableLegacyAlgorithms);
#if (defined(ENABLE_KOVPN) || defined(ENABLE_OVPNDCO) || defined(ENABLE_OVPNDCOWIN)) && !defined(OPENVPN_FORCE_TUN_NULL) && !defined(OPENVPN_EXTERNAL_TUN_FACTORY)
if (config.clientconf.dco)
#if defined(USE_TUN_BUILDER)
dco = DCOTransport::new_controller(config.builder);
#else
dco = DCOTransport::new_controller(nullptr);
#endif
#endif
layer = cp_main->layer;
#ifdef PRIVATE_TUNNEL_PROXY
if (config.alt_proxy && !dco)
alt_proxy = PTProxy::new_proxy(opt, rng);
#endif
// If HTTP proxy parameters are not supplied by API, try to get them from config
if (!http_proxy_options)
http_proxy_options = HTTPProxyTransport::Options::parse(opt);
// load remote list
if (config.remote_override)
{
remote_list.reset(new RemoteList(config.remote_override));
remote_list->set_random(prng);
}
else
remote_list.reset(new RemoteList(opt, "", RemoteList::WARN_UNSUPPORTED, nullptr, prng));
if (!remote_list->defined())
throw option_error(ERR_INVALID_CONFIG, "no remote option specified");
// If running in tun_persist mode, we need to do basic DNS caching so that
// we can avoid emitting DNS requests while the tunnel is blocked during
// reconnections.
remote_list->set_enable_cache(config.clientconf.tunPersist);
// process server/port/family overrides
remote_list->set_server_override(config.clientconf.serverOverride);
remote_list->set_port_override(config.clientconf.portOverride);
remote_list->set_proto_version_override(config.clientconf.proto_version_override);
// process protocol override, should be called after set_enable_cache
remote_list->handle_proto_override(config.clientconf.proto_override,
http_proxy_options || (alt_proxy && alt_proxy->requires_tcp()));
// process remote-random
if (opt.exists("remote-random"))
remote_list->randomize();
// get "float" option
server_addr_float = opt.exists("float");
// special remote cache handling for proxies
if (alt_proxy)
{
remote_list->set_enable_cache(false); // remote server addresses will be resolved by proxy
alt_proxy->set_enable_cache(config.clientconf.tunPersist);
}
else if (http_proxy_options)
{
remote_list->set_enable_cache(false); // remote server addresses will be resolved by proxy
http_proxy_options->proxy_server_set_enable_cache(config.clientconf.tunPersist);
}
check_for_incompatible_options(opt);
// throw an exception if dco is requested but config/options are dco-incompatible
bool dco_compatible = false;
std::tie(dco_compatible, std::ignore) = check_dco_compatibility(clientconf, opt);
if (config.clientconf.dco && !dco_compatible)
{
throw option_error(ERR_INVALID_CONFIG, "dco_compatibility: config/options are not compatible with dco");
}
#ifdef OPENVPN_PLATFORM_UWP
// workaround for OVPN3-62 Busy loop in win_event.hpp
asio_work_always_on_ = true;
#endif
synchronous_dns_lookup = config.synchronous_dns_lookup;
#ifdef OPENVPN_TLS_LINK
if (opt.exists("tls-ca"))
{
tls_ca = opt.cat("tls-ca");
}
#endif
// init transport config
const std::string session_name = load_transport_config();
// initialize tun/tap
if (dco)
{
DCO::TunConfig tunconf;
#if defined(OPENVPN_COMMAND_AGENT) && defined(OPENVPN_PLATFORM_WIN)
tunconf.setup_factory = WinCommandAgent::new_agent(opt);
#endif
tunconf.tun_prop.layer = layer;
tunconf.tun_prop.session_name = session_name;
if (tun_mtu)
tunconf.tun_prop.mtu = tun_mtu;
tunconf.tun_prop.mtu_max = tun_mtu_max;
tunconf.tun_prop.google_dns_fallback = config.clientconf.googleDnsFallback;
tunconf.tun_prop.dhcp_search_domains_as_split_domains = config.clientconf.dhcpSearchDomainsAsSplitDomains;
tunconf.tun_prop.remote_list = remote_list;
tunconf.stop = config.stop;
tunconf.allow_local_dns_resolvers = config.clientconf.allowLocalDnsResolvers;
#if defined(OPENVPN_PLATFORM_WIN)
if (config.clientconf.tunPersist)
tunconf.tun_persist.reset(new TunWin::DcoTunPersist(true, TunWrapObjRetain::NO_RETAIN_NO_REPLACE, nullptr));
#endif
tun_factory = dco->new_tun_factory(tunconf, opt);
}
else
{
#if defined(OPENVPN_EXTERNAL_TUN_FACTORY)
{
ExternalTun::Config tunconf;
tunconf.tun_prop.layer = layer;
tunconf.tun_prop.session_name = session_name;
tunconf.tun_prop.google_dns_fallback = config.clientconf.googleDnsFallback;
tunconf.tun_prop.dhcp_search_domains_as_split_domains = config.clientconf.dhcpSearchDomainsAsSplitDomains;
if (tun_mtu)
tunconf.tun_prop.mtu = tun_mtu;
tunconf.tun_prop.mtu_max = tun_mtu_max;
tunconf.frame = frame;
tunconf.stats = cli_stats;
tunconf.tun_prop.remote_list = remote_list;
tunconf.tun_persist = config.clientconf.tunPersist;
tunconf.stop = config.stop;
tun_factory.reset(config.extern_tun_factory->new_tun_factory(tunconf, opt));
if (!tun_factory)
throw option_error(ERR_INVALID_CONFIG, "OPENVPN_EXTERNAL_TUN_FACTORY: no tun factory");
}
#elif defined(USE_TUN_BUILDER)
{
TunBuilderClient::ClientConfig::Ptr tunconf = TunBuilderClient::ClientConfig::new_obj();
tunconf->builder = config.builder;
tunconf->tun_prop.session_name = session_name;
tunconf->tun_prop.google_dns_fallback = config.clientconf.googleDnsFallback;
tunconf->tun_prop.dhcp_search_domains_as_split_domains = config.clientconf.dhcpSearchDomainsAsSplitDomains;
tunconf->tun_prop.allow_local_lan_access = config.clientconf.allowLocalLanAccess;
if (tun_mtu)
tunconf->tun_prop.mtu = tun_mtu;
tunconf->tun_prop.mtu_max = tun_mtu_max;
tunconf->frame = frame;
tunconf->stats = cli_stats;
tunconf->tun_prop.remote_list = remote_list;
tun_factory = tunconf;
#if defined(OPENVPN_PLATFORM_IPHONE)
tunconf->retain_sd = true;
tunconf->tun_prefix = true;
if (config.clientconf.tunPersist)
tunconf->tun_prop.remote_bypass = true;
#endif
#if defined(OPENVPN_PLATFORM_ANDROID)
// Android VPN API only supports excluded IP prefixes starting with Android 13/API 33,
// so we must emulate them for earlier platforms
if (config.enable_route_emulation)
{
tunconf->eer_factory.reset(new EmulateExcludeRouteFactoryImpl(false));
}
else
{
tunconf->eer_factory.reset(nullptr);
}
#endif
#if defined(OPENVPN_PLATFORM_MAC)
tunconf->tun_prefix = true;
#endif
if (config.clientconf.tunPersist)
tunconf->tun_persist.reset(new TunBuilderClient::TunPersist(true, tunconf->retain_sd ? TunWrapObjRetain::RETAIN : TunWrapObjRetain::NO_RETAIN, config.builder));
tun_factory = tunconf;
}
#elif defined(OPENVPN_PLATFORM_LINUX) && !defined(OPENVPN_FORCE_TUN_NULL)
{
TunLinux::ClientConfig::Ptr tunconf = TunLinux::ClientConfig::new_obj();
tunconf->tun_prop.layer = layer;
tunconf->tun_prop.session_name = session_name;
if (tun_mtu)
tunconf->tun_prop.mtu = tun_mtu;
tunconf->tun_prop.mtu_max = tun_mtu_max;
tunconf->tun_prop.google_dns_fallback = config.clientconf.googleDnsFallback;
tunconf->tun_prop.dhcp_search_domains_as_split_domains = config.clientconf.dhcpSearchDomainsAsSplitDomains;
tunconf->generate_tun_builder_capture_event = config.clientconf.generateTunBuilderCaptureEvent;
tunconf->tun_prop.remote_list = remote_list;
tunconf->frame = frame;
tunconf->stats = cli_stats;
if (config.clientconf.tunPersist)
tunconf->tun_persist.reset(new TunLinux::TunPersist(true, TunWrapObjRetain::NO_RETAIN, nullptr));
tunconf->load(opt);
tun_factory = tunconf;
}
#elif defined(OPENVPN_PLATFORM_MAC) && !defined(OPENVPN_FORCE_TUN_NULL)
{
TunMac::ClientConfig::Ptr tunconf = TunMac::ClientConfig::new_obj();
tunconf->tun_prop.layer = layer;
tunconf->tun_prop.session_name = session_name;
tunconf->tun_prop.google_dns_fallback = config.clientconf.googleDnsFallback;
tunconf->tun_prop.dhcp_search_domains_as_split_domains = config.clientconf.dhcpSearchDomainsAsSplitDomains;
if (tun_mtu)
tunconf->tun_prop.mtu = tun_mtu;
tunconf->tun_prop.mtu_max = tun_mtu_max;
tunconf->frame = frame;
tunconf->stats = cli_stats;
tunconf->stop = config.stop;
if (config.clientconf.tunPersist)
{
tunconf->tun_persist.reset(new TunMac::TunPersist(true, TunWrapObjRetain::NO_RETAIN, nullptr));
#ifndef OPENVPN_COMMAND_AGENT
/* remote_list is required by remote_bypass to work */
tunconf->tun_prop.remote_bypass = true;
tunconf->tun_prop.remote_list = remote_list;
#endif
}
client_lifecycle.reset(new MacLifeCycle);
#ifdef OPENVPN_COMMAND_AGENT
tunconf->tun_setup_factory = UnixCommandAgent::new_agent(opt);
#endif
tun_factory = tunconf;
}
#elif defined(OPENVPN_PLATFORM_WIN) && !defined(OPENVPN_FORCE_TUN_NULL)
{
TunWin::ClientConfig::Ptr tunconf = TunWin::ClientConfig::new_obj();
tunconf->tun_prop.layer = layer;
tunconf->tun_prop.session_name = session_name;
tunconf->tun_prop.google_dns_fallback = config.clientconf.googleDnsFallback;
tunconf->tun_prop.dhcp_search_domains_as_split_domains = config.clientconf.dhcpSearchDomainsAsSplitDomains;
if (tun_mtu)
tunconf->tun_prop.mtu = tun_mtu;
tunconf->tun_prop.mtu_max = tun_mtu_max;
tunconf->frame = frame;
tunconf->stats = cli_stats;
tunconf->stop = config.stop;
tunconf->tun_type = config.clientconf.wintun ? TunWin::Wintun : TunWin::TapWindows6;
tunconf->allow_local_dns_resolvers = config.clientconf.allowLocalDnsResolvers;
if (config.clientconf.tunPersist)
{
tunconf->tun_persist.reset(new TunWin::TunPersist(true, TunWrapObjRetain::NO_RETAIN, nullptr));
#ifndef OPENVPN_COMMAND_AGENT
/* remote_list is required by remote_bypass to work */
tunconf->tun_prop.remote_bypass = true;
tunconf->tun_prop.remote_list = remote_list;
#endif
}
#ifdef OPENVPN_COMMAND_AGENT
tunconf->tun_setup_factory = WinCommandAgent::new_agent(opt);
#endif
tun_factory = tunconf;
}
#else
{
TunNull::ClientConfig::Ptr tunconf = TunNull::ClientConfig::new_obj();
tunconf->frame = frame;
tunconf->stats = cli_stats;
tun_factory = tunconf;
}
#endif
}
// The Core Library itself does not handle TAP/OSI_LAYER_2 currently,
// so we bail out early whenever someone tries to use TAP configurations
if (layer == Layer(Layer::OSI_LAYER_2))
throw ErrorCode(Error::TAP_NOT_SUPPORTED, true, "OSI layer 2 tunnels are not currently supported");
// server-poll-timeout
{
const Option *o = opt.get_ptr("server-poll-timeout");
if (o)
server_poll_timeout_ = parse_number_throw<unsigned int>(o->get(1, 16), "server-poll-timeout");
}
// create default creds object in case submit_creds is not called,
// and populate it with embedded creds, if available
{
ClientCreds::Ptr cc = new ClientCreds();
if (pcc.hasEmbeddedPassword())
{
cc->set_username(userlocked_username);
cc->set_password(pcc.embeddedPassword());
submit_creds(cc);
creds_locked = true;
}
else if (autologin_sessions)
{
submit_creds(cc);
creds_locked = true;
}
else
{
submit_creds(cc);
}
}
// configure push_base, a set of base options that will be combined with
// options pushed by server.
{
push_base.reset(new PushOptionsBase());
// base options where multiple options of the same type can aggregate
push_base->multi.extend(opt, "route");
push_base->multi.extend(opt, "route-ipv6");
push_base->multi.extend(opt, "redirect-gateway");
push_base->multi.extend(opt, "redirect-private");
push_base->multi.extend(opt, "dhcp-option");
// base options which need to be merged, not just aggregated
push_base->merge.extend(opt, "dns");
// base options where only a single instance of each option makes sense
push_base->singleton.extend(opt, "redirect-dns");
push_base->singleton.extend(opt, "inactive");
push_base->singleton.extend(opt, "route-metric");
// IPv6
{
const unsigned int n6 = push_base->singleton.extend(opt, "block-ipv6");
const unsigned int n4 = push_base->singleton.extend(opt, "block-ipv4");
if (!n6 && config.clientconf.allowUnusedAddrFamilies() == TriStateSetting::No)
{
push_base->singleton.emplace_back("block-ipv6");
}
if (!n4 && config.clientconf.allowUnusedAddrFamilies() == TriStateSetting::No)
{
push_base->singleton.emplace_back("block-ipv4");
}
}
}
handle_unused_options(opt);
}
// If those options are present, dco cannot be used
inline static std::unordered_set<std::string> dco_incompatible_opts = {
"http-proxy",
"compress",
"comp-lzo"};
/** Checks if there are dco-incompatible options in options list or config has
* dco-incompatible settings. Return dcoCompatible flag and dcoIncompatibilityReason
* string property (if applicable) */
static std::tuple<bool, std::string> check_dco_compatibility(const ClientAPI::ConfigCommon &config, const OptionList &opt)
{
#if defined(ENABLE_KOVPN)
// only care about dco/dco-win
return std::make_tuple(true, "");
#else
std::vector<std::string> reasons;
for (auto &optname : dco_incompatible_opts)
{
if (opt.exists(optname))
{
reasons.push_back("option " + optname + " is not compatible with dco");
}
}
if (config.enableLegacyAlgorithms)
{
reasons.emplace_back("legacy algorithms are not compatible with dco");
}
if (config.enableNonPreferredDCAlgorithms)
{
reasons.emplace_back("non-preferred data channel algorithms are not compatible with dco");
}
if (!config.proxyHost.empty())
{
reasons.emplace_back("proxyHost config setting is not compatible with dco");
}
if (reasons.empty())
{
return std::make_tuple(true, "");
}
else
{
return std::make_tuple(false, string::join(reasons, "\n"));
}
#endif
}
void check_for_incompatible_options(const OptionList &opt)
{
// secret option not supported
if (opt.exists("secret"))
throw option_error(ERR_INVALID_OPTION_CRYPTO, "sorry, static key encryption mode (non-SSL/TLS) is not supported");
// fragment option not supported
if (opt.exists("fragment"))
throw option_error(ERR_INVALID_OPTION_VAL, "sorry, 'fragment' directive is not supported, nor is connecting to a server that uses 'fragment' directive");
if (!opt.exists("client"))
throw option_error(ERR_INVALID_CONFIG, "Neither 'client' nor both 'tls-client' and 'pull' options declared. OpenVPN3 client only supports --client mode.");
// Only p2p mode accept
if (opt.exists("mode"))
{
const auto &mode = opt.get("mode");
if (mode.size() != 2 || mode.get(1, 128) != "p2p")
{
throw option_error(ERR_INVALID_CONFIG, "Only 'mode p2p' supported");
}
}
// key-method 2 is the only thing that 2.5+ and 3.x support
if (opt.exists("key-method"))
{
auto keymethod = opt.get("key-method");
if (keymethod.size() != 2 || keymethod.get(1, 128) != "2")
{
throw option_error(ERR_INVALID_OPTION_VAL, "Only 'key-method 2' is supported: " + keymethod.get(1, 128));
}
}
}
std::unordered_set<std::string> settings_ignoreWithWarning = {
"allow-compression", /* TODO: maybe check against our client option compression setting? */
"allow-recursive-routing",
"auth-retry",
"compat-mode",
"connect-retry",
"connect-retry-max",
"connect-timeout", /* TODO: this should be really implemented */
"data-ciphers", /* TODO: maybe add more special warning that checks it against our supported ciphers */
"data-ciphers-fallback",
"disable-dco", /* TODO: maybe throw an error if DCO is active? */
"disable-occ",
"engine",
"explicit-exit-notify", /* ignoring it in config does not break connection or functionality */
"group",
"ifconfig-nowarn", /* v3 does not do OCC checks */
"ip-win32",
"keepalive", /* A push only feature (ping/ping-restart) in v3. Ignore with warning since often present in configs too */
"link-mtu",
"machine-readable-output", /* would be set by a CliOptions */
"mark", /* enables SO_MARK */
"mute",
"ncp-ciphers",
"nice",
"opt-verify",
"passtos",
"persist-key",
"persist-tun",
"preresolve",
"providers", /* Done via client options */
"remap-usr1",
"reneg-bytes",
"reneg-pkts",
"replay-window",
"resolv-retry",
"route-method", /* Windows specific fine tuning option */
"route-delay",
"show-net-up",
"socket-flags",
"suppress-timestamps", /* harmless to ignore */
"tcp-nodelay",
"tls-version-max", /* We don't allow restricting max version */
"tun-mtu-extra", /* (only really used in tap in OpenVPN 2.x)*/
"udp-mtu", /* Alias for link-mtu */
"user",
};
std::unordered_set<std::string> settings_serverOnlyOptions = {
"auth-gen-token",
"auth-gen-token-secret",
"auth-user-pass-optional",
"auth-user-pass-verify",
"bcast-buffers",
"ccd-exclusive",
"client-config-dir",
"client-connect",
"client-disconnect",
"client-to-client",
"connect-freq",
"dh",
"disable",
"duplicate-cn",
"hash-size",
"ifconfig-ipv6-pool",
"ifconfig-pool",
"ifconfig-pool-persist",
"ifconfig-push",
"ifconfig-push-constraint",
"iroute",
"iroute-ipv6",
"max-clients",
"max-routes-per-client",
"push",
"push-remove",
"push-reset",
"server",
"server-bridge",
"server-ipv6",
"stale-routes-check",
"tls-crypt-v2-verify",
"username-as-common-name",
"verify-client-cert",
"vlan-accept",
"vlan-pvid",
"vlan-tagging",
};
/* Features not implemented and not safe to ignore */
std::unordered_set<std::string> settings_feature_not_implemented_fatal = {
"askpass",
"capath",
"cd",
"chroot",
"client-nat",
"cryptoapicert",
"daemon",
"daemon",
"errors-to-stderr",
"gremlin",
"lladdr",
"log",
"log",
"log-append",
"management",
"memstats",
"msg-channel", /* (Windows service in v2) */
"ping-timer-rem",
"single-session", /* This option is quite obscure but changes behaviour enough to not ignore it */
"socks-proxy",
"status",
"status-version",
"syslog",
"tls-server", /* No p2p mode in v3 */
"verify-hash",
"win-sys",
"writepid",
"x509-username-field",
};
/* Features not implemented but safe enough to ignore */
std::unordered_set<std::string> settings_feature_not_implemented_warn = {
"allow-pull-fqdn",
"bind",
"local",
"lport",
"mlock",
"mtu-disc",
"mtu-test",
"persist-local-ip",
"persist-remote-ip",
"shaper",
"tls-exit",
};
/* Push only options (some are allowed in the config in OpenVPN 2
* but really push only options) */
std::unordered_set<std::string> settings_pushonlyoptions = {
"auth-token",
"auth-token-user",
"echo",
"parameter",
"ping",
"ping-exit",
"ping-restart", /* ping related options are pull only in v3, v2 needs them in the config for pure p2p */
"key-derivation",
"peer-id",
"protocol-flags",
"ifconfig",
"ifconfig-ipv6",
"topology",
"route-gateway"};
/* Features related to scripts/plugins */
std::unordered_set<std::string> settings_script_plugin_feature = {
"down",
"down-pre",
"ifconfig-noexec",
"ipchange",
"learn-address",
"plugin",
"route-noexec",
"route-pre-down",
"route-up",
"setenv-safe",
"tls-export-cert",
"tls-verify",
"up",
"up-delay",
"x509-track"};
/* Standalone OpenVPN v2 modes */
std::unordered_set<std::string> settings_standalone_options = {
"genkey",
"mktun",
"rmtun",
"show-ciphers",
"show-curves",
"show-digests",
"show-engines",
"show-groups",
"show-tls",
"test-crypto"};
/* Deprecated/throwing error in OpenVPN 2.x already: */
std::unordered_set<std::string> settings_removedOptions = {
"mtu-dynamic", "no-replay", "no-name-remapping", "compat-names", "ncp-disable", "no-iv"};
std::unordered_set<std::string> settings_ignoreSilently = {
"ecdh-curve", /* Deprecated in v2, not needed with modern OpenSSL */
"fast-io",
"max-routes",
"mute-replay-warnings",
"nobind", /* only behaviour in v3 client anyway */
"prng",
"rcvbuf", /* present in many configs */
"replay-persist", /* Makes little sense in TLS mode */
"script-security",
"sndbuf",
"tmp-dir",
"tun-ipv6", /* ignored in v2 as well */
"txqueuelen", /* so platforms evaluate that in tun, some do not, do not warn about that */
"verb"};
class OptionErrors
{
public:
void add_failed_opt(const Option &o, const std::string &message, bool fatal_arg)
{
if (!options_per_category.contains(message))
{
options_per_category[message] = {};
}
fatal |= fatal_arg;
options_per_category[message].push_back(o);
}
void print_option_errors()
{
std::ostringstream os;
for (const auto &[category, options] : options_per_category)
{
if (!options.empty())
{
OPENVPN_LOG(category);
os << category << ": ";
std::vector<std::string> opts;
for (size_t i = 0; i < options.size(); ++i)
{
auto &o = options[i];
OPENVPN_LOG(std::to_string(i) << ' ' << o.render(Option::RENDER_BRACKET | Option::RENDER_TRUNC_64));
opts.push_back(o.get(0, 64));
}
os << string::join(opts, ",") << std::endl;
}
}
if (fatal)
{
throw ErrorCode(Error::UNUSED_OPTIONS, true, os.str());
}
}
private:
std::map<std::string, std::vector<Option>> options_per_category;
bool fatal = false;
};
/**
* This groups all the options that OpenVPN 2.x supports that the
* OpenVPN v3 client does not support into a number of different groups
* and warns or errors out if with a specific message for that group.
*
* If any option that is not touched() after going through all groups
* the function will print them as unknown unsupported option(s) and
* error out
*/
void handle_unused_options(const OptionList &opt)
{
/* Meta options that AS profiles often have that we do not parse and
* can ignore without warning */
std::unordered_set<std::string> ignoreMetaOptions = {
"CLI_PREF_ALLOW_WEB_IMPORT",
"CLI_PREF_BASIC_CLIENT",
"CLI_PREF_ENABLE_CONNECT",
"CLI_PREF_ENABLE_XD_PROXY",
"WSHOST",
"WEB_CA_BUNDLE",
"IS_OPENVPN_WEB_CA",
"NO_WEB",
"ORGANIZATION"};
std::unordered_set<std::string> ignore_unknown_option_list;
if (opt.exists("ignore-unknown-option"))
{
auto igOptlist = opt.get_index("ignore-unknown-option");
for (auto igUnOptIdx : igOptlist)
{
const Option &o = opt[igUnOptIdx];
for (size_t i = 1; i < o.size(); i++)
{
const auto &optionToIgnore = o.get(i, 0);
ignore_unknown_option_list.insert(optionToIgnore);
}
o.touch();
}
}
for (const auto &o : opt)
{
if (!o.meta() && settings_ignoreSilently.contains(o.get(0, 0)))
{
o.touch();
}
if (o.meta() && ignoreMetaOptions.contains(o.get(0, 0)))
{
o.touch();
}
}
/* Mark all options that will not trigger any kind of message
* as touched to avoid an empty message with unused options */
if (opt.n_unused() == 0)
return;
OPENVPN_LOG_NTNL("NOTE: This configuration contains options that were not used:" << std::endl);
OptionErrors errors{};
/* Go through all options and check all options that have not been
* touched (parsed) yet */
showUnusedOptionsByList(opt, settings_removedOptions, "Removed deprecated option", true, errors);
showUnusedOptionsByList(opt, settings_serverOnlyOptions, "Server only option", true, errors);
showUnusedOptionsByList(opt, settings_standalone_options, "OpenVPN 2.x command line operation", true, errors);
showUnusedOptionsByList(opt, settings_feature_not_implemented_warn, "Feature not implemented (option ignored)", false, errors);
showUnusedOptionsByList(opt, settings_pushonlyoptions, "Option allowed only to be pushed by the server", true, errors);
showUnusedOptionsByList(opt, settings_script_plugin_feature, "Ignored (no script/plugin support)", false, errors);
showUnusedOptionsByList(opt, ignore_unknown_option_list, "Ignored by option 'ignore-unknown-option'", false, errors);
showUnusedOptionsByList(opt, settings_ignoreWithWarning, "Unsupported option (ignored)", false, errors);