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openvpn3/openvpn/client/cliopt.hpp
David Sommerseth 75dbcdfa93
Merge OpenVPN 3 Core v3.8.2 into master 
Signed-off-by: David Sommerseth <davids@openvpn.net>
2023-09-13 16:46:05 +02:00

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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) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// 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 <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/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;
bool disable_client_cert = false;
int default_key_direction = -1;
bool autologin_sessions = false;
bool allow_local_lan_access = false;
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 && config.autologin_sessions);
// digest factory
DigestFactory::Ptr digest_factory(new CryptoDigestFactory<SSLLib::CryptoAPI>());
// initialize RNG/PRNG
rng.reset(new SSLLib::RandomAPI(false));
prng.reset(new SSLLib::RandomAPI(true));
// 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("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("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.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;
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("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.allow_local_lan_access = config.allow_local_lan_access;
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->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;
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;
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());
cc->enable_password_cache(true);
cc->set_replace_password_with_session_id(true);
submit_creds(cc);
creds_locked = true;
}
else if (autologin_sessions)
{
// autologin sessions require replace_password_with_session_id
cc->set_replace_password_with_session_id(true);
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, "");
#endif
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"));
}
}
void check_for_incompatible_options(const OptionList &opt)
{
// secret option not supported
if (opt.exists("secret"))
throw option_error("sorry, static key encryption mode (non-SSL/TLS) is not supported");
// fragment option not supported
if (opt.exists("fragment"))
throw option_error("sorry, 'fragment' directive is not supported, nor is connecting to a server that uses 'fragment' directive");
if (!opt.exists("client"))
throw option_error("Neither 'client' nor both 'tls-client' and 'pull' options declared. OpenVPN3 client only supports --client mode.");
// Only p2p mode accept
if (opt.exists("mode"))
{
auto mode = opt.get("mode");
if (mode.size() != 1 || mode.get(1, 128) != "p2p")
{
throw option_error("Only 'mode p2p' supported");
}
}
}
std::unordered_set<std::string> settings_ignoreWithWarning = {
"allow-compression", /* TODO: maybe check against our client option compression setting? */
"allow-recursive-routing",
"auth-nocache",
"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 */
"show-net-up",
"socket-flags",
"suppress-timestamps", /* harmless to ignore */
"tcp-nodelay",
"tls-version-max", /* We don't allow restricting max version */
"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 */
"tun-mtu-extra", /*(only really used in tap in OpenVPN 2.x)*/
"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",
};
/* 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"};
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"};
/**
* 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",
"OVPN_ACCESS_SERVER_NO_WEB",
};
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++)
{
auto optionToIgnore = o.get(i, 0);
ignore_unknown_option_list.insert(optionToIgnore);
}
o.touch();
}
}
for (const auto &o : opt)
{
if (!o.meta() && settings_ignoreSilently.find(o.get(0, 0)) != settings_ignoreSilently.end())
{
o.touch();
}
if (o.meta() && ignoreMetaOptions.find(o.get(0, 0)) != ignoreMetaOptions.end())
{
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);
/* Go through all options and check all options that have not been
* touched (parsed) yet */
showUnusedOptionsByList(opt, settings_removedOptions, "Removed deprecated option", true);
showUnusedOptionsByList(opt, settings_serverOnlyOptions, "Server only option", true);
showUnusedOptionsByList(opt, settings_standalone_options, "OpenVPN 2.x command line operation", true);
showUnusedOptionsByList(opt, settings_feature_not_implemented_warn, "Feature not implemented (option ignored)", false);
showUnusedOptionsByList(opt, settings_pushonlyoptions, "Option allowed only to be pushed by the server", true);
showUnusedOptionsByList(opt, settings_feature_not_implemented_warn, "feature not implemented/available", false);
showUnusedOptionsByList(opt, settings_script_plugin_feature, "Ignored (no script/plugin support)", false);
showUnusedOptionsByList(opt, ignore_unknown_option_list, "Ignored by option 'ignore-unknown-option'", false);
showUnusedOptionsByList(opt, settings_ignoreWithWarning, "Unsupported option (ignored)", false);
auto ignoredBySetenvOpt = [](const Option &option)
{ return !option.touched() && option.warnonlyunknown(); };
showOptionsByFunction(opt, ignoredBySetenvOpt, "Ignored options prefixed with 'setenv opt'", false);
auto unusedMetaOpt = [](const Option &option)
{ return !option.touched() && option.meta(); };
showOptionsByFunction(opt, unusedMetaOpt, "Unused ignored meta options", false);
auto managmentOpt = [](const Option &option)
{ return !option.touched() && option.get(0, 0).rfind("management", 0) == 0; };
showOptionsByFunction(opt, managmentOpt, "OpenVPN management interface is not supported by this client", true);
// If we still have options that are unaccounted for, we print them and throw an error or just warn about them
auto onlyLightlyTouchedOptions = [](const Option &option)
{ return option.touched_lightly(); };
showOptionsByFunction(opt, onlyLightlyTouchedOptions, "Unused options, probably specified multiple times in the configuration file", false);
auto nonTouchedOptions = [](const Option &option)
{ return !option.touched() && !option.touched_lightly(); };
showOptionsByFunction(opt, nonTouchedOptions, OPENVPN_UNUSED_OPTIONS, true);
}
void showUnusedOptionsByList(const OptionList &optlist, std::unordered_set<std::string> option_set, const std::string &message, bool fatal)
{
auto func = [&option_set](const Option &opt)
{ return !opt.touched() && option_set.find(opt.get(0, 0)) != option_set.end(); };
showOptionsByFunction(optlist, func, message, fatal);
}
/* lambda expression that capture variables have complex signatures, avoid these by letting the compiler
* itself figure it out with a template */
template <typename T>
void showOptionsByFunction(const OptionList &opt, T func, const std::string &message, bool fatal)
{
bool messageShown = false;
for (size_t i = 0; i < opt.size(); ++i)
{
auto &o = opt[i];
if (func(o))
{
if (!messageShown)
{
OPENVPN_LOG(message);
messageShown = true;
}
o.touch();
OPENVPN_LOG_NTNL(std::to_string(i) << ' ' << o.render(Option::RENDER_BRACKET | Option::RENDER_TRUNC_64) << std::endl);
}
}
if (fatal && messageShown)
{
throw option_error("sorry, unsupported options present in configuration: " + message);
}
}
static PeerInfo::Set::Ptr build_peer_info(const Config &config, const ParseClientConfig &pcc, const bool autologin_sessions)
{
PeerInfo::Set::Ptr pi(new PeerInfo::Set);
// autologin sessions
if (autologin_sessions)
pi->emplace_back("IV_AUTO_SESS", "1");
if (pcc.pushPeerInfo())
{
/* ensure that we use only one variable with the same name */
std::unordered_map<std::string, std::string> extra_values;
if (pcc.peerInfoUV())
{
for (auto const &kv : *pcc.peerInfoUV())
{
extra_values[kv.key] = kv.value;
}
}
/* Config::peerInfo takes precedence */
if (config.extra_peer_info.get())
{
for (auto const &kv : *config.extra_peer_info.get())
{
extra_values[kv.key] = kv.value;
}
}
for (auto kv : extra_values)
{
pi->emplace_back(kv.first, kv.second);
}
}
// UI version
if (!config.clientconf.guiVersion.empty())
pi->emplace_back("IV_GUI_VER", config.clientconf.guiVersion);
// Supported SSO methods
if (!config.clientconf.ssoMethods.empty())
pi->emplace_back("IV_SSO", config.clientconf.ssoMethods);
// MAC address
if (pcc.pushPeerInfo())
{
std::string hwaddr = get_hwaddr();
if (!config.clientconf.hwAddrOverride.empty())
pi->emplace_back("IV_HWADDR", config.clientconf.hwAddrOverride);
else if (!hwaddr.empty())
pi->emplace_back("IV_HWADDR", hwaddr);
pi->emplace_back("IV_SSL", get_ssl_library_version());
if (!config.clientconf.platformVersion.empty())
pi->emplace_back("IV_PLAT_VER", config.clientconf.platformVersion);
}
return pi;
}
void next(RemoteList::Advance type)
{
bool omit_next = false;
if (alt_proxy)
omit_next = alt_proxy->next();
if (!omit_next)
remote_list->next(type);
load_transport_config();
}
void remote_reset_cache_item()
{
remote_list->reset_cache_item();
}
bool pause_on_connection_timeout()
{
if (reconnect_notify)
return reconnect_notify->pause_on_connection_timeout();
else
return false;
}
bool retry_on_auth_failed() const
{
return clientconf.retryOnAuthFailed;
}
/**
* Return a client configuration to be used as configuration for the
* control layer.
*
* Will basically copy a subset of this configuration object to a new
* smaller configuration object
*/
Client::Config::Ptr client_config(const bool relay_mode)
{
Client::Config::Ptr cli_config = new Client::Config;
// Copy ProtoConfig so that modifications due to server push will
// not persist across client instantiations.
cli_config->proto_context_config.reset(new Client::ProtoConfig(proto_config_cached(relay_mode)));
cli_config->proto_context_options = proto_context_options;
cli_config->push_base = push_base;
cli_config->transport_factory = transport_factory;
cli_config->tun_factory = tun_factory;
cli_config->cli_stats = cli_stats;
cli_config->cli_events = cli_events;
cli_config->creds = creds;
cli_config->pushed_options_filter = pushed_options_filter;
cli_config->tcp_queue_limit = tcp_queue_limit;
cli_config->echo = clientconf.echo;
cli_config->info = clientconf.info;
cli_config->autologin_sessions = autologin_sessions;
return cli_config;
}
bool need_creds() const
{
return !autologin;
}
void submit_creds(const ClientCreds::Ptr &creds_arg)
{
if (!creds_arg)
return;
// Override HTTP proxy credentials if provided dynamically
if (http_proxy_options && creds_arg->http_proxy_username_defined())
http_proxy_options->username = creds_arg->get_http_proxy_username();
if (http_proxy_options && creds_arg->http_proxy_password_defined())
http_proxy_options->password = creds_arg->get_http_proxy_password();
if (!creds_locked)
{
// if no username is defined in creds and userlocked_username is defined
// in profile, set the creds username to be the userlocked_username
if (!creds_arg->username_defined() && !userlocked_username.empty())
creds_arg->set_username(userlocked_username);
creds = creds_arg;
}
}
bool server_poll_timeout_enabled() const
{
return !http_proxy_options;
}
Time::Duration server_poll_timeout() const
{
return Time::Duration::seconds(server_poll_timeout_);
}
SessionStats &stats()
{
return *cli_stats;
}
const SessionStats::Ptr &stats_ptr() const
{
return cli_stats;
}
ClientEvent::Queue &events()
{
return *cli_events;
}
ClientLifeCycle *lifecycle()
{
return client_lifecycle.get();
}
int conn_timeout() const
{
return clientconf.connTimeout;
}
bool asio_work_always_on() const
{
return asio_work_always_on_;
}
RemoteList::Ptr remote_list_precache() const
{
RemoteList::Ptr r;
if (alt_proxy)
{
alt_proxy->precache(r);
if (r)
return r;
}
if (http_proxy_options)
{
http_proxy_options->proxy_server_precache(r);
if (r)
return r;
}
return remote_list;
}
void update_now()
{
now_.update();
}
void finalize(const bool disconnected)
{
if (tun_factory)
tun_factory->finalize(disconnected);
}
private:
Client::ProtoConfig &proto_config_cached(const bool relay_mode)
{
if (relay_mode && cp_relay)
return *cp_relay;
else
return *cp_main;
}
Client::ProtoConfig::Ptr proto_config(const OptionList &opt,
const Config &config,
const ParseClientConfig &pcc,
const bool relay_mode)
{
// relay mode is null unless one of the below directives is defined
if (relay_mode && !opt.exists("relay-mode"))
return Client::ProtoConfig::Ptr();
// load flags
unsigned int lflags = SSLConfigAPI::LF_PARSE_MODE;
if (relay_mode)
lflags |= SSLConfigAPI::LF_RELAY_MODE;
// client SSL config
SSLLib::SSLAPI::Config::Ptr cc(new SSLLib::SSLAPI::Config());
cc->set_external_pki_callback(config.external_pki);
cc->set_frame(frame);
cc->set_flags(SSLConst::LOG_VERIFY_STATUS);
cc->set_debug_level(config.clientconf.sslDebugLevel);
cc->set_rng(rng);
cc->set_local_cert_enabled(pcc.clientCertEnabled() && !config.disable_client_cert);
/* load depends on private key password and legacy algorithms */
cc->enable_legacy_algorithms(config.clientconf.enableLegacyAlgorithms);
cc->set_private_key_password(config.clientconf.privateKeyPassword);
cc->load(opt, lflags);
cc->set_tls_version_min_override(config.clientconf.tlsVersionMinOverride);
cc->set_tls_cert_profile_override(config.clientconf.tlsCertProfileOverride);
cc->set_tls_cipher_list(config.clientconf.tlsCipherList);
cc->set_tls_ciphersuite_list(config.clientconf.tlsCiphersuitesList);
// client ProtoContext config
Client::ProtoConfig::Ptr cp(new Client::ProtoConfig());
cp->ssl_factory = cc->new_factory();
cp->relay_mode = relay_mode;
cp->dc.set_factory(new CryptoDCSelect<SSLLib::CryptoAPI>(cp->ssl_factory->libctx(), frame, cli_stats, prng));
cp->dc_deferred = true; // defer data channel setup until after options pull
cp->tls_auth_factory.reset(new CryptoOvpnHMACFactory<SSLLib::CryptoAPI>());
cp->tls_crypt_factory.reset(new CryptoTLSCryptFactory<SSLLib::CryptoAPI>());
cp->tls_crypt_metadata_factory.reset(new CryptoTLSCryptMetadataFactory());
cp->tlsprf_factory.reset(new CryptoTLSPRFFactory<SSLLib::CryptoAPI>());
cp->load(opt, *proto_context_options, config.default_key_direction, false);
cp->set_xmit_creds(!autologin || pcc.hasEmbeddedPassword() || autologin_sessions);
cp->extra_peer_info = build_peer_info(config, pcc, autologin_sessions);
cp->frame = frame;
cp->now = &now_;
cp->rng = rng;
cp->prng = prng;
return cp;
}
std::string load_transport_config()
{
// get current transport protocol
const Protocol &transport_protocol = remote_list->current_transport_protocol();
// If we are connecting over a proxy, and TCP protocol is required, but current
// transport protocol is NOT TCP, we will throw an internal error because this
// should have been caught earlier in RemoteList::handle_proto_override.
// construct transport object
#ifdef OPENVPN_EXTERNAL_TRANSPORT_FACTORY
ExternalTransport::Config transconf;
transconf.remote_list = remote_list;
transconf.frame = frame;
transconf.stats = cli_stats;
transconf.socket_protect = socket_protect;
transconf.server_addr_float = server_addr_float;
transconf.synchronous_dns_lookup = synchronous_dns_lookup;
transconf.protocol = transport_protocol;
transport_factory = extern_transport_factory->new_transport_factory(transconf);
#ifdef OPENVPN_GREMLIN
udpconf->gremlin_config = gremlin_config;
#endif
#else
if (dco)
{
DCO::TransportConfig transconf;
transconf.protocol = transport_protocol;
transconf.remote_list = remote_list;
transconf.frame = frame;
transconf.stats = cli_stats;
transconf.server_addr_float = server_addr_float;
transconf.socket_protect = socket_protect;
transport_factory = dco->new_transport_factory(transconf);
}
else if (alt_proxy)
{
if (alt_proxy->requires_tcp() && !transport_protocol.is_tcp())
throw option_error("internal error: no TCP server entries for " + alt_proxy->name() + " transport");
AltProxy::Config conf;
conf.remote_list = remote_list;
conf.frame = frame;
conf.stats = cli_stats;
conf.digest_factory.reset(new CryptoDigestFactory<SSLLib::CryptoAPI>());
conf.socket_protect = socket_protect;
conf.rng = rng;
transport_factory = alt_proxy->new_transport_client_factory(conf);
}
else if (http_proxy_options)
{
if (!transport_protocol.is_tcp())
throw option_error("internal error: no TCP server entries for HTTP proxy transport");
// HTTP Proxy transport
HTTPProxyTransport::ClientConfig::Ptr httpconf = HTTPProxyTransport::ClientConfig::new_obj();
httpconf->remote_list = remote_list;
httpconf->frame = frame;
httpconf->stats = cli_stats;
httpconf->digest_factory.reset(new CryptoDigestFactory<SSLLib::CryptoAPI>(cp_main->ssl_factory->libctx()));
httpconf->socket_protect = socket_protect;
httpconf->http_proxy_options = http_proxy_options;
httpconf->rng = rng;
#ifdef PRIVATE_TUNNEL_PROXY
httpconf->skip_html = true;
#endif
transport_factory = httpconf;
}
else
{
if (transport_protocol.is_udp())
{
// UDP transport
UDPTransport::ClientConfig::Ptr udpconf = UDPTransport::ClientConfig::new_obj();
udpconf->remote_list = remote_list;
udpconf->frame = frame;
udpconf->stats = cli_stats;
udpconf->socket_protect = socket_protect;
udpconf->server_addr_float = server_addr_float;
#ifdef OPENVPN_GREMLIN
udpconf->gremlin_config = gremlin_config;
#endif
transport_factory = udpconf;
}
else if (transport_protocol.is_tcp()
#ifdef OPENVPN_TLS_LINK
|| transport_protocol.is_tls()
#endif
)
{
// TCP transport
TCPTransport::ClientConfig::Ptr tcpconf = TCPTransport::ClientConfig::new_obj();
tcpconf->remote_list = remote_list;
tcpconf->frame = frame;
tcpconf->stats = cli_stats;
tcpconf->socket_protect = socket_protect;
#ifdef OPENVPN_TLS_LINK
if (transport_protocol.is_tls())
tcpconf->use_tls = true;
tcpconf->tls_ca = tls_ca;
#endif
#ifdef OPENVPN_GREMLIN
tcpconf->gremlin_config = gremlin_config;
#endif
transport_factory = tcpconf;
}
else
throw option_error("internal error: unknown transport protocol");
}
#endif // OPENVPN_EXTERNAL_TRANSPORT_FACTORY
return remote_list->current_server_host();
}
// General client options.
ClientConfigParsed clientconf;
Time now_; // current time
RandomAPI::Ptr rng;
RandomAPI::Ptr prng;
Frame::Ptr frame;
Layer layer;
Client::ProtoConfig::Ptr cp_main;
Client::ProtoConfig::Ptr cp_relay;
RemoteList::Ptr remote_list;
bool server_addr_float;
TransportClientFactory::Ptr transport_factory;
TunClientFactory::Ptr tun_factory;
SocketProtect *socket_protect;
ReconnectNotify *reconnect_notify;
SessionStats::Ptr cli_stats;
ClientEvent::Queue::Ptr cli_events;
ClientCreds::Ptr creds;
unsigned int server_poll_timeout_;
unsigned int tcp_queue_limit;
ProtoContextCompressionOptions::Ptr proto_context_options;
HTTPProxyTransport::Options::Ptr http_proxy_options;
#ifdef OPENVPN_GREMLIN
Gremlin::Config::Ptr gremlin_config;
#endif
std::string userlocked_username;
bool autologin;
bool autologin_sessions;
bool creds_locked;
bool asio_work_always_on_;
bool synchronous_dns_lookup;
PushOptionsBase::Ptr push_base;
OptionList::FilterBase::Ptr pushed_options_filter;
ClientLifeCycle::Ptr client_lifecycle;
AltProxy::Ptr alt_proxy;
DCO::Ptr dco;
#ifdef OPENVPN_EXTERNAL_TRANSPORT_FACTORY
ExternalTransport::Factory *extern_transport_factory;
#endif
#ifdef OPENVPN_TLS_LINK
std::string tls_ca;
#endif
};
} // namespace openvpn
#endif
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