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265 | // Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Kea Hooks Basic
// Commercial End User License Agreement v2.0. See COPYING file in the premium/
// directory.
#include <config.h>
#include <d2srv/dns_client.h>
#include <dns/messagerenderer.h>
#include <dns/opcode.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <gss_tsig_dns_server.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <gtest/gtest.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
namespace isc {
namespace gss_tsig {
namespace test {
using namespace boost::asio;
using namespace boost::asio::ip;
using namespace isc;
using namespace isc::asiolink;
using namespace isc::d2;
using namespace isc::dns;
using namespace isc::dns::rdata;
using namespace isc::dns::rdata::generic;
using namespace isc::util;
using namespace std;
namespace ph = std::placeholders;
const char* DummyDNSServer::TEST_ADDRESS = "127.0.0.1";
void
DummyDNSServer::start() {
// In order to perform the full test, when the client sends the request
// and receives a response from the server, we have to emulate the
// server's response in the test. A request will be sent via loopback
// interface to 127.0.0.1 and known test port. Response must be sent
// to 127.0.0.1 and the source port which has been used to send the
// request. A new socket is created, specifically to handle sending
// responses. The reuse address option is set so as both sockets can
// use the same address. This new socket is bound to the test address
// and port, where requests will be sent.
socket_.reset(new udp::socket(io_service_->getInternalIOService(),
boost::asio::ip::udp::v4()));
socket_->set_option(socket_base::reuse_address(true));
socket_->bind(udp::endpoint(address::from_string(TEST_ADDRESS), TEST_PORT));
// Once socket is created, we can post an IO request to receive some
// packet from this socket. This is asynchronous operation and
// nothing is received until another IO request to send a query is
// posted and the run() is invoked on this IO. A callback function is
// attached to this asynchronous read. This callback function requires
// that a socket object used to receive the request is passed to it,
// because the same socket will be used by the callback function to send
// a response. Also, the remote object is passed to the callback,
// because it holds a source address and port where request originated.
// Callback function will send a response to this address and port.
// The last parameter holds a length of the received request. It is
// required to construct a response.
endpoint_.reset(new udp::endpoint());
socket_->async_receive_from(boost::asio::buffer(receive_buffer_,
sizeof(receive_buffer_)),
*endpoint_,
std::bind(&DummyDNSServer::udpTKeyExchangeReceiveHandler,
this, socket_.get(), endpoint_.get(),
ph::_2));
}
void
DummyDNSServer::readTKey(InputBufferPtr inbuf, GssApiBufferPtr& intoken,
Name& key_name, qid_t& qid) {
MessagePtr msg(new Message(Message::PARSE));
msg->fromWire(*inbuf);
qid = msg->getQid();
// Validate the TKEY response.
ASSERT_FALSE(msg->getHeaderFlag(Message::HEADERFLAG_QR));
ASSERT_EQ(msg->getRcode(), Rcode::NOERROR());
ASSERT_EQ(msg->getOpcode(), Opcode::QUERY());
ASSERT_EQ(msg->getRRCount(Message::SECTION_QUESTION), 1);
QuestionPtr question = *msg->beginQuestion();
ASSERT_TRUE(question);
ASSERT_EQ(question->getClass(), RRClass::ANY());
ASSERT_EQ(question->getType(), RRType::TKEY());
RRsetPtr rrset = *msg->beginSection(Message::SECTION_ADDITIONAL);
ASSERT_TRUE(rrset);
key_name = rrset->getName();
ASSERT_EQ(rrset->getClass(), RRClass::ANY());
ASSERT_EQ(rrset->getType(), RRType::TKEY());
ASSERT_EQ(rrset->getRdataCount(), 1);
auto rdata_it = rrset->getRdataIterator();
const TKEY& tkey = dynamic_cast<const TKEY&>(rdata_it->getCurrent());
ASSERT_EQ(tkey.getError(), Rcode::NOERROR_CODE);
intoken.reset(new GssApiBuffer(tkey.getKeyLen(), tkey.getKey()));
}
void
DummyDNSServer::writeTKey(GssApiBuffer& outtoken, Name& key_name,
OutputBufferPtr& outbuf, GssTsigKeyPtr srv_key,
qid_t qid, bool sign) {
MessagePtr msg(new Message(Message::RENDER));
msg->setOpcode(Opcode::QUERY());
msg->setRcode(Rcode::NOERROR());
msg->setQid(qid);
msg->setHeaderFlag(Message::HEADERFLAG_QR, true);
msg->addQuestion(Question(key_name, RRClass::ANY(), RRType::TKEY()));
// Create the TKEY Resource Record.
RRsetPtr tkey_rrset(new RRset(key_name, RRClass::ANY(),
RRType::TKEY(), RRTTL(0)));
Name algorithm("gss-tsig.");
uint32_t inception = static_cast<uint32_t>(time(0));
uint32_t expire = inception + 3600;
uint16_t mode = TKEY::GSS_API_MODE;
uint16_t error = Rcode::NOERROR().getCode();
uint16_t key_len = static_cast<uint16_t>(outtoken.getLength());
ConstRdataPtr tkey_rdata(new TKEY(algorithm, inception, expire, mode, error,
key_len, outtoken.getValue(), 0, 0));
tkey_rrset->addRdata(tkey_rdata);
msg->addRRset(Message::SECTION_ANSWER, tkey_rrset);
// Encode the TKEY request.
MessageRenderer renderer;
outbuf.reset(new OutputBuffer(MAX_SIZE));
renderer.setBuffer(outbuf.get());
renderer.setLengthLimit(MAX_SIZE);
if (sign && srv_key) {
TSIGContextPtr context = srv_key->createContext();
msg->toWire(renderer, context.get());
} else {
msg->toWire(renderer);
}
}
void
DummyDNSServer::writeTKeyDuplicate(OutputBufferPtr& outbuf, qid_t qid) {
MessagePtr msg(new Message(Message::RENDER));
msg->setOpcode(Opcode::QUERY());
// BADNAME Duplicate key name [RFC 2930]
msg->setRcode(Rcode(20));
msg->setQid(qid);
// Encode the TKEY request.
MessageRenderer renderer;
outbuf.reset(new OutputBuffer(MAX_SIZE));
renderer.setBuffer(outbuf.get());
renderer.setLengthLimit(MAX_SIZE);
msg->toWire(renderer);
}
void
DummyDNSServer::udpTKeyExchangeReceiveHandler(udp::socket* socket,
udp::endpoint* remote,
size_t receive_length) {
OM_uint32 lifetime = 0;
GssApiName srv_name("DNS/blu.example.nil@EXAMPLE.NIL");
GssApiCredPtr srv_cred(new GssApiCred(srv_name, GSS_C_ACCEPT, lifetime));
InputBufferPtr recv_buf(new InputBuffer(receive_buffer_, receive_length));
GssApiBufferPtr intoken;
qid_t qid;
Name key_name("foo");
readTKey(recv_buf, intoken, key_name, qid);
ASSERT_TRUE(intoken);
string key_str = key_name.toText();
if (match_exact_key_) {
ASSERT_EQ(key_str, "1234.sig-blu.example.nil.");
}
OutputBufferPtr send_buf;
if (keys_.find(key_str) != keys_.end()) {
ASSERT_NO_THROW(writeTKeyDuplicate(send_buf, qid));
} else {
keys_.insert(key_str);
srv_key_.reset(new ManagedKey(key_str));
GssApiBuffer outtoken;
GssApiName client_name;
ASSERT_NO_THROW(srv_key_->getSecCtx().accept(*srv_cred, *intoken,
client_name, outtoken));
ASSERT_NO_THROW(writeTKey(outtoken, key_name, send_buf, srv_key_, qid,
sign_tkey_));
}
ASSERT_TRUE(send_buf);
// A response message is now ready to send. Send it!
socket->send_to(boost::asio::buffer(send_buf->getData(),
send_buf->getLength()),
*remote);
if (!go_on_) {
return;
}
if (only_tkey_) {
socket_->async_receive_from(boost::asio::buffer(receive_buffer_,
sizeof(receive_buffer_)),
*endpoint_,
std::bind(&DummyDNSServer::udpTKeyExchangeReceiveHandler,
this, socket_.get(), endpoint_.get(),
ph::_2));
} else {
socket_->async_receive_from(boost::asio::buffer(receive_buffer_,
sizeof(receive_buffer_)),
*endpoint_,
std::bind(&DummyDNSServer::udpDNSUpdateReceiveHandler,
this, socket_.get(), endpoint_.get(),
ph::_2));
}
}
void
DummyDNSServer::udpDNSUpdateReceiveHandler(udp::socket* socket,
udp::endpoint* remote,
size_t receive_length) {
TSIGContextPtr context;
if (sign_update_ && srv_key_) {
context = srv_key_->createContext();
}
isc::util::InputBuffer received_data_buffer(receive_buffer_,
receive_length);
dns::Message request(Message::PARSE);
request.fromWire(received_data_buffer);
// If context is not NULL, then we need to verify the message.
if (context) {
TSIGError error = context->verify(request.getTSIGRecord(),
receive_buffer_, receive_length);
if (error != TSIGError::NOERROR()) {
isc_throw(TSIGVerifyError, "TSIG verification failed: "
<< error.toText());
}
}
dns::Message response(Message::RENDER);
response.setOpcode(Opcode(Opcode::UPDATE_CODE));
response.setHeaderFlag(dns::Message::HEADERFLAG_QR, true);
response.setQid(request.getQid());
response.setRcode(Rcode::NOERROR());
dns::Question question(Name("example.com."),
RRClass::IN(), RRType::SOA());
response.addQuestion(question);
MessageRenderer renderer;
if (context) {
response.toWire(renderer, context.get());
} else {
response.toWire(renderer);
}
// A response message is now ready to send. Send it!
socket->send_to(boost::asio::buffer(renderer.getData(),
renderer.getLength()), *remote);
}
}
}
}
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