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webserver.cc
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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "utility.hh"
#include "webserver.hh"
#include "misc.hh"
#include <thread>
#include "threadname.hh"
#include <utility>
#include <vector>
#include "logger.hh"
#include <stdio.h>
#include "dns.hh"
#include "base64.hh"
#include "json.hh"
#include "uuid-utils.hh"
#include <yahttp/router.hpp>
json11::Json HttpRequest::json()
{
string err;
if(this->body.empty()) {
SLOG(g_log<<Logger::Debug<<logprefix<<"JSON document expected in request body, but body was empty" << endl,
d_slog->info(Logr::Debug, "JSON document expected in request body, but body was empty"));
throw HttpBadRequestException();
}
json11::Json doc = json11::Json::parse(this->body, err);
if (doc.is_null()) {
SLOG(g_log<<Logger::Debug<<logprefix<<"parsing of JSON document failed:" << err << endl,
d_slog->error(Logr::Debug, err, "parsing of JSON document failed"));
throw HttpBadRequestException();
}
return doc;
}
bool HttpRequest::compareAuthorization(const CredentialsHolder& credentials) const
{
// validate password
auto header = headers.find("authorization");
bool auth_ok = false;
if (header != headers.end() && toLower(header->second).find("basic ") == 0) {
string cookie = header->second.substr(6);
string plain;
B64Decode(cookie, plain);
vector<string> cparts;
stringtok(cparts, plain, ":");
auth_ok = (cparts.size() == 2 && credentials.matches(cparts[1].c_str()));
}
return auth_ok;
}
bool HttpRequest::compareHeader(const string &header_name, const string &expected_value) const
{
auto header = headers.find(header_name);
if (header == headers.end()) {
return false;
}
// this gets rid of terminating zeros
return (0==strcmp(header->second.c_str(), expected_value.c_str()));
}
bool HttpRequest::compareHeader(const string &header_name, const CredentialsHolder& credentials) const
{
auto header = headers.find(header_name);
if (header == headers.end()) {
return false;
}
return credentials.matches(header->second);
}
void HttpResponse::setPlainBody(const string& document)
{
this->headers["Content-Type"] = "text/plain; charset=utf-8";
this->body = document;
}
void HttpResponse::setYamlBody(const string& document)
{
this->headers["Content-Type"] = "application/x-yaml";
this->body = document;
}
void HttpResponse::setJsonBody(const string& document)
{
this->headers["Content-Type"] = "application/json";
this->body = document;
}
void HttpResponse::setJsonBody(const json11::Json& document)
{
this->headers["Content-Type"] = "application/json";
document.dump(this->body);
}
void HttpResponse::setErrorResult(const std::string& message, const int status_)
{
setJsonBody(json11::Json::object { { "error", message } });
this->status = status_;
}
void HttpResponse::setSuccessResult(const std::string& message, const int status_)
{
setJsonBody(json11::Json::object { { "result", message } });
this->status = status_;
}
static void bareHandlerWrapper(const WebServer::HandlerFunction& handler, YaHTTP::Request* req, YaHTTP::Response* resp)
{
// wrapper to convert from YaHTTP::* to our subclasses
handler(static_cast<HttpRequest*>(req), static_cast<HttpResponse*>(resp));
}
void WebServer::registerBareHandler(const string& url, const HandlerFunction& handler)
{
YaHTTP::THandlerFunction f = [=](YaHTTP::Request* req, YaHTTP::Response* resp){return bareHandlerWrapper(handler, req, resp);};
YaHTTP::Router::Any(url, f);
}
static bool optionsHandler(HttpRequest* req, HttpResponse* resp) {
if (req->method == "OPTIONS") {
resp->headers["access-control-allow-origin"] = "*";
resp->headers["access-control-allow-headers"] = "Content-Type, X-API-Key";
resp->headers["access-control-allow-methods"] = "GET, POST, PUT, PATCH, DELETE, OPTIONS";
resp->headers["access-control-max-age"] = "3600";
resp->status = 200;
resp->headers["content-type"]= "text/plain";
resp->body = "";
return true;
}
return false;
}
void WebServer::apiWrapper(const WebServer::HandlerFunction& handler, HttpRequest* req, HttpResponse* resp, bool allowPassword) {
if (optionsHandler(req, resp)) return;
resp->headers["access-control-allow-origin"] = "*";
if (!d_apikey) {
SLOG(g_log<<Logger::Error<<req->logprefix<<"HTTP API Request \"" << req->url.path << "\": Authentication failed, API Key missing in config" << endl,
d_slog->info(Logr::Error, "Authentication failed, API Key missing in config", "urlpath", Logging::Loggable(req->url.path)));
throw HttpUnauthorizedException("X-API-Key");
}
bool auth_ok = req->compareHeader("x-api-key", *d_apikey) || d_apikey->matches(req->getvars["api-key"]);
if (!auth_ok && allowPassword) {
if (d_webserverPassword) {
auth_ok = req->compareAuthorization(*d_webserverPassword);
} else {
auth_ok = true;
}
}
if (!auth_ok) {
SLOG(g_log<<Logger::Error<<req->logprefix<<"HTTP Request \"" << req->url.path << "\": Authentication by API Key failed" << endl,
d_slog->info(Logr::Error, "Authentication by API Key failed", "urlpath", Logging::Loggable(req->url.path)));
throw HttpUnauthorizedException("X-API-Key");
}
// security headers
resp->headers["X-Content-Type-Options"] = "nosniff";
resp->headers["X-Frame-Options"] = "deny";
resp->headers["X-Permitted-Cross-Domain-Policies"] = "none";
resp->headers["X-XSS-Protection"] = "1; mode=block";
resp->headers["Content-Security-Policy"] = "default-src 'self'; style-src 'self' 'unsafe-inline'";
req->getvars.erase("_"); // jQuery cache buster
try {
resp->status = 200;
handler(req, resp);
} catch (ApiException &e) {
resp->setErrorResult(e.what(), 422);
return;
} catch (JsonException &e) {
resp->setErrorResult(e.what(), 422);
return;
}
if (resp->status == 204) {
// No Content -> no Content-Type.
resp->headers.erase("Content-Type");
}
}
void WebServer::registerApiHandler(const string& url, const HandlerFunction& handler, bool allowPassword) {
auto f = [=](HttpRequest *req, HttpResponse* resp){apiWrapper(handler, req, resp, allowPassword);};
registerBareHandler(url, f);
}
void WebServer::webWrapper(const WebServer::HandlerFunction& handler, HttpRequest* req, HttpResponse* resp) {
if (d_webserverPassword) {
bool auth_ok = req->compareAuthorization(*d_webserverPassword);
if (!auth_ok) {
SLOG(g_log<<Logger::Debug<<req->logprefix<<"HTTP Request \"" << req->url.path << "\": Web Authentication failed" << endl,
d_slog->info(Logr::Debug, "HTTP Request: Web Authentication failed", "urlpath", Logging::Loggable(req->url.path)));
throw HttpUnauthorizedException("Basic");
}
}
handler(req, resp);
}
void WebServer::registerWebHandler(const string& url, const HandlerFunction& handler) {
auto f = [=](HttpRequest *req, HttpResponse *resp){webWrapper(handler, req, resp);};
registerBareHandler(url, f);
}
static void *WebServerConnectionThreadStart(const WebServer* webServer, std::shared_ptr<Socket> client) {
setThreadName("rec/webhndlr");
const std::string msg = "Exception while serving a connection in main webserver thread";
try {
webServer->serveConnection(client);
}
catch(PDNSException &e) {
SLOG(g_log<<Logger::Error<<"PDNSException while serving a connection in main webserver thread: "<<e.reason<<endl,
webServer->d_slog->error(Logr::Error, e.reason, msg, "exception", Logging::Loggable("PDNSException")));
}
catch(std::exception &e) {
SLOG(g_log<<Logger::Error<<"STL Exception while serving a connection in main webserver thread: "<<e.what()<<endl,
webServer->d_slog->error(Logr::Error, e.what(), msg, "exception", Logging::Loggable("std::exception")));
}
catch(...) {
SLOG(g_log<<Logger::Error<<"Unknown exception while serving a connection in main webserver thread"<<endl,
webServer->d_slog->info(Logr::Error, msg));
}
return nullptr;
}
void WebServer::handleRequest(HttpRequest& req, HttpResponse& resp) const
{
// set default headers
resp.headers["Content-Type"] = "text/html; charset=utf-8";
#ifdef RECURSOR
auto log = req.d_slog->withValues("urlpath", Logging::Loggable(req.url.path));
#endif
try {
if (!req.complete) {
SLOG(g_log<<Logger::Debug<<req.logprefix<<"Incomplete request" << endl,
d_slog->info(Logr::Debug, "Incomplete request"));
throw HttpBadRequestException();
}
SLOG(g_log<<Logger::Debug<<req.logprefix<<"Handling request \"" << req.url.path << "\"" << endl,
log->info(Logr::Debug, "Handling request"));
YaHTTP::strstr_map_t::iterator header;
if ((header = req.headers.find("accept")) != req.headers.end()) {
// yaml wins over json, json wins over html
if (header->second.find("application/x-yaml") != std::string::npos) {
req.accept_yaml = true;
} else if (header->second.find("text/x-yaml") != std::string::npos) {
req.accept_yaml = true;
} else if (header->second.find("application/json") != std::string::npos) {
req.accept_json = true;
} else if (header->second.find("text/html") != std::string::npos) {
req.accept_html = true;
}
}
YaHTTP::THandlerFunction handler;
if (!YaHTTP::Router::Route(&req, handler)) {
SLOG(g_log<<Logger::Debug<<req.logprefix<<"No route found for \"" << req.url.path << "\"" << endl,
log->info(Logr::Debug, "No route found"));
throw HttpNotFoundException();
}
const string msg = "HTTP ISE Exception";
try {
handler(&req, &resp);
SLOG(g_log<<Logger::Debug<<req.logprefix<<"Result for \"" << req.url.path << "\": " << resp.status << ", body length: " << resp.body.size() << endl,
log->info(Logr::Debug, "Result", "status", Logging::Loggable(resp.status), "bodyLength", Logging::Loggable(resp.body.size())));
}
catch(HttpException&) {
throw;
}
catch(PDNSException &e) {
SLOG(g_log<<Logger::Error<<req.logprefix<<"HTTP ISE for \""<< req.url.path << "\": Exception: " << e.reason << endl,
log->error(Logr::Error, e.reason, msg, "exception", Logging::Loggable("PDNSException")));
throw HttpInternalServerErrorException();
}
catch(std::exception &e) {
SLOG(g_log<<Logger::Error<<req.logprefix<<"HTTP ISE for \""<< req.url.path << "\": STL Exception: " << e.what() << endl,
log->error(Logr::Error, e.what(), msg, "exception", Logging::Loggable("std::exception")));
throw HttpInternalServerErrorException();
}
catch(...) {
SLOG(g_log<<Logger::Error<<req.logprefix<<"HTTP ISE for \""<< req.url.path << "\": Unknown Exception" << endl,
log->info(Logr::Error, msg));
throw HttpInternalServerErrorException();
}
}
catch(HttpException &e) {
resp = e.response();
#ifdef RECURSOR
// An HttpException does not initialize d_slog
if (!resp.d_slog) {
resp.setSLog(log);
}
#endif
// TODO rm this logline?
SLOG(g_log<<Logger::Debug<<req.logprefix<<"Error result for \"" << req.url.path << "\": " << resp.status << endl,
d_slog->error(Logr::Debug, resp.status, "Error result", "urlpath", Logging::Loggable(req.url.path)));
string what = YaHTTP::Utility::status2text(resp.status);
if (req.accept_json) {
resp.headers["Content-Type"] = "application/json";
if (resp.body.empty()) {
resp.setErrorResult(what, resp.status);
}
} else if (req.accept_html) {
resp.headers["Content-Type"] = "text/html; charset=utf-8";
resp.body = "<!html><title>" + what + "</title><h1>" + what + "</h1>";
} else {
resp.headers["Content-Type"] = "text/plain; charset=utf-8";
resp.body = what;
}
}
// always set these headers
resp.headers["Connection"] = "close";
if (req.method == "HEAD") {
resp.body = "";
} else {
resp.headers["Content-Length"] = std::to_string(resp.body.size());
}
}
#ifdef RECURSOR
// Helper to log key-value maps used by YaHTTP
template<>
std::string Logging::IterLoggable<YaHTTP::strstr_map_t::const_iterator>::to_string() const
{
std::ostringstream oss;
bool first = true;
for (auto i = _t1; i != _t2; i++) {
if (!first) {
oss << '\n';
}
else {
first = false;
}
oss << i->first << ": " << i->second;
}
return oss.str();
}
#endif
void WebServer::logRequest(const HttpRequest& req, const ComboAddress& remote) const {
if (d_loglevel >= WebServer::LogLevel::Detailed) {
#ifdef RECURSOR
if (!g_slogStructured) {
#endif
auto logprefix = req.logprefix;
g_log<<Logger::Notice<<logprefix<<"Request details:"<<endl;
bool first = true;
for (const auto& r : req.getvars) {
if (first) {
first = false;
g_log<<Logger::Notice<<logprefix<<" GET params:"<<endl;
}
g_log<<Logger::Notice<<logprefix<<" "<<r.first<<": "<<r.second<<endl;
}
first = true;
for (const auto& r : req.postvars) {
if (first) {
first = false;
g_log<<Logger::Notice<<logprefix<<" POST params:"<<endl;
}
g_log<<Logger::Notice<<logprefix<<" "<<r.first<<": "<<r.second<<endl;
}
first = true;
for (const auto& h : req.headers) {
if (first) {
first = false;
g_log<<Logger::Notice<<logprefix<<" Headers:"<<endl;
}
g_log<<Logger::Notice<<logprefix<<" "<<h.first<<": "<<h.second<<endl;
}
if (req.body.empty()) {
g_log<<Logger::Notice<<logprefix<<" No body"<<endl;
} else {
g_log<<Logger::Notice<<logprefix<<" Full body: "<<endl;
g_log<<Logger::Notice<<logprefix<<" "<<req.body<<endl;
}
#ifdef RECURSOR
}
else {
req.d_slog->info(Logr::Info, "Request details", "getParams", Logging::IterLoggable(req.getvars.cbegin(), req.getvars.cend()),
"postParams", Logging::IterLoggable(req.postvars.cbegin(), req.postvars.cend()),
"body", Logging::Loggable(req.body),
"address", Logging::Loggable(remote));
}
#endif
}
}
void WebServer::logResponse(const HttpResponse& resp, const ComboAddress& /* remote */, const string& logprefix) const {
if (d_loglevel >= WebServer::LogLevel::Detailed) {
#ifdef RECURSOR
if (!g_slogStructured) {
#endif
g_log<<Logger::Notice<<logprefix<<"Response details:"<<endl;
bool first = true;
for (const auto& h : resp.headers) {
if (first) {
first = false;
g_log<<Logger::Notice<<logprefix<<" Headers:"<<endl;
}
g_log<<Logger::Notice<<logprefix<<" "<<h.first<<": "<<h.second<<endl;
}
if (resp.body.empty()) {
g_log<<Logger::Notice<<logprefix<<" No body"<<endl;
} else {
g_log<<Logger::Notice<<logprefix<<" Full body: "<<endl;
g_log<<Logger::Notice<<logprefix<<" "<<resp.body<<endl;
}
#ifdef RECURSOR
}
else {
resp.d_slog->info(Logr::Info, "Response details", "headers", Logging::IterLoggable(resp.headers.cbegin(), resp.headers.cend()),
"body", Logging::Loggable(resp.body));
}
#endif
}
}
void WebServer::serveConnection(const std::shared_ptr<Socket>& client) const {
const auto unique = getUniqueID();
const string logprefix = d_logprefix + to_string(unique) + " ";
HttpRequest req(logprefix);
HttpResponse resp;
#ifdef RECURSOR
auto log = d_slog->withValues("uniqueid", Logging::Loggable(to_string(unique)));
req.setSLog(log);
resp.setSLog(log);
#endif
resp.max_response_size=d_maxbodysize;
ComboAddress remote;
string reply;
try {
YaHTTP::AsyncRequestLoader yarl;
yarl.initialize(&req);
req.max_request_size=d_maxbodysize;
int timeout = 5;
client->setNonBlocking();
try {
while(!req.complete) {
int bytes;
char buf[16000];
bytes = client->readWithTimeout(buf, sizeof(buf), timeout);
if (bytes > 0) {
string data = string(buf, bytes);
req.complete = yarl.feed(data);
} else {
// read error OR EOF
break;
}
}
yarl.finalize();
} catch (YaHTTP::ParseError &e) {
// request stays incomplete
SLOG(g_log<<Logger::Warning<<logprefix<<"Unable to parse request: "<<e.what()<<endl,
d_slog->error(Logr::Warning, e.what(), "Unable to parse request"));
}
// Uses of `remote` below guarded by d_loglevel
if (d_loglevel > WebServer::LogLevel::None) {
client->getRemote(remote);
}
logRequest(req, remote);
WebServer::handleRequest(req, resp);
ostringstream ss;
resp.write(ss);
reply = ss.str();
logResponse(resp, remote, logprefix);
client->writenWithTimeout(reply.c_str(), reply.size(), timeout);
}
catch(PDNSException &e) {
SLOG(g_log<<Logger::Error<<logprefix<<"HTTP Exception: "<<e.reason<<endl,
d_slog->error(Logr::Error, e.reason, "HTTP Exception", "exception", Logging::Loggable("PDNSException")));
}
catch(std::exception &e) {
if(strstr(e.what(), "timeout")==nullptr)
SLOG(g_log<<Logger::Error<<logprefix<<"HTTP STL Exception: "<<e.what()<<endl,
d_slog->error(Logr::Error, e.what(), "HTTP Exception", "exception", Logging::Loggable("std::exception")));
}
catch(...) {
SLOG(g_log<<Logger::Error<<logprefix<<"Unknown exception"<<endl,
d_slog->info(Logr::Error, "HTTP Exception"));
}
if (d_loglevel >= WebServer::LogLevel::Normal) {
SLOG(g_log<<Logger::Notice<<logprefix<<remote<<" \""<<req.method<<" "<<req.url.path<<" HTTP/"<<req.versionStr(req.version)<<"\" "<<resp.status<<" "<<reply.size()<<endl,
d_slog->info(Logr::Info, "Request", "remote", Logging::Loggable(remote), "method", Logging::Loggable(req.method),
"urlpath", Logging::Loggable(req.url.path), "HTTPVersion", Logging::Loggable(req.versionStr(req.version)),
"status", Logging::Loggable(resp.status), "respsize", Logging::Loggable(reply.size())));
}
}
WebServer::WebServer(string listenaddress, int port) :
d_listenaddress(std::move(listenaddress)),
d_port(port),
d_server(nullptr),
d_maxbodysize(2*1024*1024)
{
}
void WebServer::bind()
{
try {
d_server = createServer();
SLOG(g_log<<Logger::Warning<<d_logprefix<<"Listening for HTTP requests on "<<d_server->d_local.toStringWithPort()<<endl,
d_slog->info(Logr::Info, "Listening for HTTP requests", "address", Logging::Loggable(d_server->d_local)));
}
catch(NetworkError &e) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"Listening on HTTP socket failed: "<<e.what()<<endl,
d_slog->error(Logr::Error, e.what(), "Listening on HTTP socket failed", "exception", Logging::Loggable("NetworkError")));
d_server = nullptr;
}
}
void WebServer::go()
{
if(!d_server)
return;
const string msg = "Exception in main webserver thread";
try {
while(true) {
const string acceptmsg = "Exception while accepting a connection in main webserver thread";
try {
auto client = d_server->accept();
if (!client) {
continue;
}
if (client->acl(d_acl)) {
std::thread webHandler(WebServerConnectionThreadStart, this, client);
webHandler.detach();
} else {
ComboAddress remote;
if (client->getRemote(remote))
g_log<<Logger::Error<<d_logprefix<<"Webserver closing socket: remote ("<< remote.toString() <<") does not match the set ACL("<<d_acl.toString()<<")"<<endl;
}
}
catch(PDNSException &e) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"PDNSException while accepting a connection in main webserver thread: "<<e.reason<<endl,
d_slog->error(Logr::Error, e.reason, acceptmsg, Logging::Loggable("PDNSException")));
}
catch(std::exception &e) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"STL Exception while accepting a connection in main webserver thread: "<<e.what()<<endl,
d_slog->error(Logr::Error, e.what(), acceptmsg, Logging::Loggable("std::exception")));
}
catch(...) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"Unknown exception while accepting a connection in main webserver thread"<<endl,
d_slog->info(Logr::Error, msg));
}
}
}
catch(PDNSException &e) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"PDNSException in main webserver thread: "<<e.reason<<endl,
d_slog->error(Logr::Error, e.reason, msg, Logging::Loggable("PDNSException")));
}
catch(std::exception &e) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"STL Exception in main webserver thread: "<<e.what()<<endl,
d_slog->error(Logr::Error, e.what(), msg, Logging::Loggable("std::exception")));
}
catch(...) {
SLOG(g_log<<Logger::Error<<d_logprefix<<"Unknown exception in main webserver thread"<<endl,
d_slog->info(Logr::Error, msg));
}
_exit(1);
}