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Copy pathproxymaker.cpp
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483 lines (351 loc) · 16.3 KB
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/*
Smithproxy- transparent proxy with SSL inspection capabilities.
Copyright (c) 2014, Ales Stibal <astib@mag0.net>, All rights reserved.
Smithproxy is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Smithproxy 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Smithproxy. If not, see <http://www.gnu.org/licenses/>.
Linking Smithproxy statically or dynamically with other modules is
making a combined work based on Smithproxy. Thus, the terms and
conditions of the GNU General Public License cover the whole combination.
In addition, as a special exception, the copyright holders of Smithproxy
give you permission to combine Smithproxy with free software programs
or libraries that are released under the GNU LGPL and with code
included in the standard release of OpenSSL under the OpenSSL's license
(or modified versions of such code, with unchanged license).
You may copy and distribute such a system following the terms
of the GNU GPL for Smithproxy and the licenses of the other code
concerned, provided that you include the source code of that other code
when and as the GNU GPL requires distribution of source code.
Note that people who make modified versions of Smithproxy are not
obligated to grant this special exception for their modified versions;
it is their choice whether to do so. The GNU General Public License
gives permission to release a modified version without this exception;
this exception also makes it possible to release a modified version
which carries forward this exception.
*/
#include <service/cfgapi/cfgapi.hpp>
#include <policy/authfactory.hpp>
#include <proxy/mitmproxy.hpp>
#include <proxy/proxymaker.hpp>
#include <proxy/nbrhood.hpp>
namespace sx::proxymaker {
namespace log {
logan_lite& proxy() {
static auto l_ = logan_lite("proxy");
return l_;
}
logan_lite& routing() {
static auto l_ = logan_lite("proxy.routing");
return l_;
}
logan_lite& make() {
static auto l_ = logan_lite("proxy.make");
return l_;
}
logan_lite& policy() {
static auto l_ = logan_lite("proxy.policy");
return l_;
}
logan_lite& authorize() {
static auto l_ = logan_lite("proxy.authorize");
return l_;
}
logan_lite& snat() {
static auto l_ = logan_lite("proxy.snat");
return l_;
}
logan_lite& connect() {
static auto l_ = logan_lite("proxy.connect");
return l_;
}
}
std::unique_ptr<MitmProxy> make (baseHostCX *left, baseHostCX *right) {
if(not left or not right) return nullptr;
auto new_proxy = std::make_unique<MitmProxy>(left->com()->slave());
auto const& log = log::make();
// resolve internal name
left->name();
// let's add this just_accepted_cx into new_proxy
if (left->read_waiting_for_peercom()) {
_deb("MitmMasterProxy::on_left_new: ldaadd the new waiting_for_peercom cx");
new_proxy->ldaadd(left);
} else {
_deb("MitmMasterProxy::on_left_new: ladd the new cx (unpaused)");
new_proxy->ladd(left);
}
auto entangle = [] (baseHostCX *l, baseHostCX *r) {
r->com()->l3_proto(l->com()->l3_proto());
l->peer(r);
r->peer(l);
};
entangle(left, right);
// almost done, just add this target_cx to right side of new proxy
new_proxy->radd(right);
return new_proxy;
}
bool policy (std::unique_ptr<MitmProxy>& proxy, bool implicit_allow) {
auto const& log = log::policy();
auto bypass_cx = [] (baseHostCX const* cx) {
auto *scom = dynamic_cast<SSLCom *>(cx->com());
if (scom != nullptr) {
scom->opt.bypass = true;
scom->verify_reset(SSLCom::verify_status_t::VRF_OK);
}
};
// apply policy and get result
int policy_num = -1;
if (implicit_allow) {
// bypass ssl com to VIP
bypass_cx(proxy->first_left());
bypass_cx(proxy->first_right());
policy_num = PolicyRule::POLICY_IMPLICIT_PASS;
} else {
policy_num = CfgFactory::get()->policy_apply(proxy->first_left(), proxy.get());
}
auto *src_cx = proxy->first_left();
if (not src_cx) {
if (auto fl = proxy->first_left(); fl)
_not("MitmMasterProxy::proxy_enforce: source %s is not MitmHostCX", fl->c_type());
return false;
}
auto *dst_cx = proxy->first_right();
if (not dst_cx) {
if (auto fr = proxy->first_right(); fr)
_not("MitmMasterProxy::proxy_enforce: destination %s is not MitmHostCX", fr->c_type());
return false;
}
// let know CX what policy it matched (it is handy when ie upgrade to TLS)
src_cx->matched_policy(policy_num);
dst_cx->matched_policy(policy_num);
proxy->matched_policy(policy_num);
// we are done
if(policy_num < 0) return true;
if( auto policy = CfgFactory::get()->lookup_policy(policy_num); policy) {
if(policy->profile_routing and not route(proxy, policy->profile_routing))
_err("routing failed");
}
if(proxy and not implicit_allow) {
proxy->update_neighbors();
}
return true;
}
using optional_string = std::optional<std::string>;
std::pair<optional_string, optional_string>
get_dnat_target(std::unique_ptr<MitmProxy> const& proxy, std::shared_ptr<ProfileRouting> routing_profile) {
if(not routing_profile) return {std::nullopt, std::nullopt };
auto const& log = log::routing();
std::string ip;
std::string port;
{
auto l_ = std::scoped_lock(routing_profile->lb_state.lock_);
auto candidates = routing_profile->lb_candidates(proxy->com()->l3_proto());
if(candidates.empty()) return { std::nullopt, std::nullopt };
size_t index = 0;
switch(routing_profile->dnat_lb_method) {
case ProfileRouting::lb_method::LB_RR:
index = routing_profile->lb_index_rr(candidates.size());
break;
case ProfileRouting::lb_method::LB_L3:
index = routing_profile->lb_index_l3(proxy.get(), candidates.size());
break;
case ProfileRouting::lb_method::LB_L4:
index = routing_profile->lb_index_l4(proxy.get(), candidates.size());
break;
default:
// act as LB_RR
index = routing_profile->lb_index_rr(candidates.size());
}
ip = candidates[index]->ip();
}
if(not routing_profile->dnat_ports.empty()) {
// find address object referred in "routing"
auto prt = CfgFactory::get()->lookup_port(routing_profile->dnat_ports[0].c_str());
if(prt) {
if( auto port_obj = std::dynamic_pointer_cast<CfgRange>(prt); port_obj) {
// no balancing on ports
port = string_format("%d", port_obj->value().first);
if(port_obj->value().first != port_obj->value().second) {
_not("range set, but only first port number is used");
}
}
}
}
return { ip.empty() ? std::nullopt : std::make_optional(ip),
port.empty() ? std::nullopt : std::make_optional(port) };
}
bool route_existing(MitmProxy*proxy, std::shared_ptr<ProfileRouting> routing_profile) {
auto p = std::unique_ptr<MitmProxy>(proxy);
auto r = route(p, routing_profile);
p.release();
return r;
}
bool route(std::unique_ptr<MitmProxy> &proxy, std::shared_ptr<ProfileRouting> routing_profile) {
if(not routing_profile or not proxy) { return false; }
auto const& log = log::routing();
// update rt profile internals
routing_profile->update();
auto [ op_ip, op_port ] = get_dnat_target(proxy, routing_profile);
if(not op_ip and not op_port) { return false; }
auto orig_px_name = proxy->to_string(iINF);
for (auto const *cx: proxy->rs()) {
if (op_ip) {
cx->host(op_ip.value());
_dia("%s: routing to IP: %s", orig_px_name.c_str(), op_ip->c_str());
}
// safeval covers cases when port is set to zero - which means no changes (ie "all" default port range)
if (op_port) {
auto port = safe_val(op_port.value());
_dia("%s: routing to port: %s", orig_px_name.c_str(), port > 0 ? op_port->c_str() : "<unchanged>");
if(port > 0) {
cx->port(op_port.value());
}
}
}
return true;
}
std::pair<std::string, unsigned short> to_magic(unsigned short target_port) {
std::string redir_host;
unsigned short redir_port;
const unsigned short base = 65000;
if (target_port == base) {
// bend broker magic IP
redir_port = base + raw::try_down_cast<unsigned short>(CfgFactory::get()->tenant_index);
} else if (target_port != 443) {
// auth portal https magic IP
redir_port = raw::try_down_cast<unsigned short>(std::stoi(AuthFactory::get().options.portal_port_http));
} else {
// auth portal plaintext magic IP
redir_port = raw::try_down_cast<unsigned short>(std::stoi(AuthFactory::get().options.portal_port_https));
}
redir_host = "127.0.0.1";
return std::make_pair(redir_host, redir_port);
}
bool authorize_is_bad (MitmProxy *proxy) {
auto *left = proxy->first_left();
auto const* right = proxy->first_right();
if (not left or not right) return false;
auto const policy = CfgFactory::get()->policy_prof_auth(left->matched_policy());
if(not policy) return false;
auto const& log = log::authorize();
bool bad_auth = true;
// investigate L3 protocol
int af = AF_INET;
if (left->com()) {
af = left->com()->l3_proto();
}
std::string str_af = SockOps::family_str(af);
// use common base pointer, so we can use all IdentityInfo types
std::optional<std::vector<std::string>> maybe_groups;
if (af == AF_INET or af == 0) {
maybe_groups = AuthFactory::get().ip4_get_groups(left->host());
} else if (af == AF_INET6) {
maybe_groups = AuthFactory::get().ip6_get_groups(left->host());
}
if(not maybe_groups) return bad_auth;
for (auto const &sub_policy: CfgFactory::get()->policy_prof_auth(left->matched_policy())->sub_policies) {
for (auto const &candidate: maybe_groups.value()) {
_deb("Connection identities: testing ip identity '%s' against policy '%s'", candidate.c_str(), sub_policy->element_name().c_str());
if (candidate == sub_policy->element_name()) {
_dia("Connection identities: ip identity '%s' matches policy '%s'", candidate.c_str(),
sub_policy->element_name().c_str());
bad_auth = false;
break;
}
}
// don't iterate if we know we are ok
if (not bad_auth)
break;
}
return bad_auth;
}
bool authorize(std::unique_ptr<MitmProxy>& proxy) {
auto const& log = log::authorize();
// resolve source information - is there an identity info for that IP?
if (proxy->auth_opts.authenticate) {
_deb("proxymaker::authorize[%s]: must be authorized", proxy->to_string(iINF).c_str());
bool res = proxy->resolve_identity();
if(res) {
_dia("proxymaker::authorize[%s]: identity resolved: %s/%s", proxy->to_string(iINF).c_str(),
proxy->identity()->username().c_str(),
proxy->identity()->groups().c_str());
if (authorize_is_bad(proxy.get())) {
_dia("proxymaker::authorize[%s]: this identity is not authorized", proxy->to_string(iINF).c_str());
proxy->auth_opts.block_identity = true;
return false;
}
}
else {
_dia("proxymaker::authorize[%s]: identity not resolved", proxy->to_string(iINF).c_str());
return false;
}
} else if (proxy->auth_opts.resolve) {
_deb("proxymaker::authorize[%s]: optional identity check", proxy->to_string(iINF).c_str());
proxy->resolve_identity();
}
_deb("proxymaker::authorize[%s]: no identity needed", proxy->to_string(iINF).c_str());
return true;
}
bool is_replaceable (unsigned short port) {
constexpr std::array<unsigned short, 2> ports = {80, 443};
return std::find(ports.begin(), ports.end(), port) != ports.end();
}
bool setup_snat (std::unique_ptr<MitmProxy> &proxy, std::string const &source_host, std::string const &source_port) {
if (not proxy) return false;
auto const* source_cx = proxy->first_left();
auto const* target_cx = proxy->first_right();
if (not target_cx or not source_cx) return false;
bool enforce_nat = proxy->matched_policy() == PolicyRule::POLICY_IMPLICIT_PASS;
auto const& log = log::snat();
// setup NAT
if (not enforce_nat) {
try {
if (CfgFactory::get()->db_policy_list.at(proxy->matched_policy())->nat == PolicyRule::POLICY_NAT_NONE) {
target_cx->com()->nonlocal_src_port() = std::stoi(source_port);
target_cx->com()->nonlocal_src_host() = source_host;
target_cx->com()->nonlocal_src(true);
}
}
catch (std::invalid_argument const &e) {
_err("proxy_setup_snat (nonat)[%s]: policy #%d: error %s", proxy->to_string(iINF).c_str(),
proxy->matched_policy(), e.what());
return false;
}
catch (std::out_of_range const &e) {
_err("proxy_setup_snat (nonat)[%s]: policy #%d: error %s", proxy->to_string(iINF).c_str(),
proxy->matched_policy(), e.what());
return false;
}
}
return true;
}
bool connect(MasterProxy* owner, std::unique_ptr<MitmProxy> &&new_proxy) {
auto proxy_of_mine = std::move(new_proxy);
auto const& log = log::connect();
if (owner and proxy_of_mine) {
auto const* left = proxy_of_mine->first_left();
auto* right = proxy_of_mine->first_right();
auto *oc = owner->com();
if (left and right and oc) {
_deb("proxymaker::connect[%s]: connecting", proxy_of_mine->to_string(iINF).c_str());
// owner com sets new_proxy as the epoll handler for left socket
// finalize connection acceptance by adding new proxy to proxies and connect
int right_socket = right->connect();
oc->set_monitor(right_socket);
oc->set_poll_handler(left->socket(), proxy_of_mine.get());
oc->set_poll_handler(right_socket, proxy_of_mine.get());
_deb("proxymaker::connect[%s]: adding to owner proxy", proxy_of_mine->to_string(iINF).c_str());
owner->add_proxy(std::move(proxy_of_mine));
return true;
}
}
_deb("proxymaker::connect[%s]: cannot connect null objects");
return false;
}
}
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