/
ConnectionHandler.cpp
4478 lines (4043 loc) · 178 KB
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ConnectionHandler.cpp
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//: http://e2guardian.org/
// Released under the GPL v2, with the OpenSSL exception described in the README file.
// INCLUDES
#ifdef HAVE_CONFIG_H
#include "dgconfig.h"
#endif
//#include "NaughtyFilter.hpp"
//#include "StoryBoard.hpp"
#include "ConnectionHandler.hpp"
#include "DataBuffer.hpp"
#include "UDSocket.hpp"
//#include "Auth.hpp"
#include "FDTunnel.hpp"
#include "BackedStore.hpp"
#include "Queue.hpp"
#include "ImageContainer.hpp"
#include "FDFuncs.hpp"
#include <signal.h>
#include <arpa/nameser.h>
#include <resolv.h>
#ifdef __SSLMITM
#include "CertificateAuthority.hpp"
#endif //__SSLMITM
#include <syslog.h>
#include <cerrno>
#include <cstdio>
#include <ctime>
#include <algorithm>
#include <netdb.h>
#include <cstdlib>
#include <unistd.h>
#include <sys/time.h>
#include <strings.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <istream>
#include <sstream>
#include <memory>
#ifdef ENABLE_ORIG_IP
#include <linux/types.h>
#include <linux/netfilter_ipv4.h>
#endif
#ifdef __SSLMITM
#include "openssl/ssl.h"
#include "openssl/x509v3.h"
#include "String.hpp"
#endif
// GLOBALS
extern OptionContainer o;
extern bool is_daemonised;
extern std::atomic<bool> ttg;
extern thread_local std::string thread_id;
// IMPLEMENTATION
ConnectionHandler::ConnectionHandler()
: clienthost(NULL) {
//ch_isiphost.comp(",*[a-z|A-Z].*");
// initialise SBauth structure
SBauth.filter_group = 0;
SBauth.is_authed = false;
SBauth.user_name = "";
}
// Custom exception class for POST filtering errors
class postfilter_exception : public std::runtime_error {
public:
postfilter_exception(const char *const &msg)
: std::runtime_error(msg) {};
};
//
// URL cache funcs
//
// check the URL cache to see if we've already flagged an address as clean
bool wasClean(HTTPHeader &header, String &url, const int fg) {
return false; // this function needs rewriting always return false
}
// add a known clean URL to the cache
void addToClean(String &url, const int fg) {
return; // this function needs rewriting
}
//
// ConnectionHandler class
//
void ConnectionHandler::peerDiag(const char *message, Socket &peersock) {
if (o.logconerror) {
//int peerport = peersock.getPeerSourcePort();
std::string peer_ip = peersock.getPeerIP();
int err = peersock.getErrno();
if (peersock.isTimedout())
syslog(LOG_INFO, "%s %s Client at %s Connection timedout - errno: %d", thread_id.c_str(), message,
peer_ip.c_str(), err);
else if (peersock.isHup())
syslog(LOG_INFO, "%s %s Client at %s has disconnected - errno: %d", thread_id.c_str(), message,
peer_ip.c_str(), err);
else if (peersock.sockError())
syslog(LOG_INFO, "%s %s Client at %s Connection socket error - errno: %d", thread_id.c_str(), message,
peer_ip.c_str(), err);
else if (peersock.isNoRead())
syslog(LOG_INFO, "%s %s cant read Client Connection at %s - errno: %d ", thread_id.c_str(), message,
peer_ip.c_str(), err);
else if (peersock.isNoWrite())
syslog(LOG_INFO, "%s %s cant write Client Connection at %s - errno: %d ", thread_id.c_str(), message,
peer_ip.c_str(), err);
else if (peersock.isNoOpp())
syslog(LOG_INFO, "%s %s Client Connection is no-op - errno: %d", thread_id.c_str(), message, err);
else
syslog(LOG_INFO, "%s %s Client Connection at %s problem - errno: %d", thread_id.c_str(), message,
peer_ip.c_str(), err);
}
}
void ConnectionHandler::upstreamDiag(const char *message, Socket &proxysock) {
if (o.logconerror) {
int err = proxysock.getErrno();
if (proxysock.isTimedout())
syslog(LOG_INFO, "%s %s upstream timedout - errno: %d:", thread_id.c_str(), message, err);
else if (proxysock.isHup())
syslog(LOG_INFO, "%s %s upstream has disconnected - errno: %d", thread_id.c_str(), message, err);
else if (proxysock.sockError())
syslog(LOG_INFO, "%s %s upstream socket error - errno: %d", thread_id.c_str(), message, err);
else if (proxysock.isNoRead())
syslog(LOG_INFO, "%s %s cant read upstream Connection - errno: %d ", thread_id.c_str(), message, err);
else if (proxysock.isNoWrite())
syslog(LOG_INFO, "%s %s cant write upstream Connection - errno: %d", thread_id.c_str(), message, err);
else if (proxysock.isNoOpp())
syslog(LOG_INFO, "%s %s upstream Connection is no-op - errno: %d", thread_id.c_str(), message, err);
else
syslog(LOG_INFO, "%s %s upstream Connection problem - errno: %d", thread_id.c_str(), message, err);
}
if (proxysock.isNoOpp())
proxysock.close();
}
// perform URL encoding on a string
std::string ConnectionHandler::miniURLEncode(const char *s) {
std::string encoded;
char *buf = new char[3];
unsigned char c;
for (int i = 0; i < (signed) strlen(s); i++) {
c = s[i];
// allowed characters in a url that have non special meaning
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9')) {
encoded += c;
continue;
}
// all other characters get encoded
sprintf(buf, "%02x", c);
encoded += "%";
encoded += buf;
}
delete[] buf;
return encoded;
}
// create a temporary bypass URL for the banned page
String ConnectionHandler::hashedURL(String *url, int filtergroup, std::string *clientip,
bool infectionbypass, std::string *user) {
// filter/virus bypass hashes last for a certain time only
//String timecode(time(NULL) + (infectionbypass ? (*ldl->fg[filtergroup]).infection_bypass_mode : (*ldl->fg[filtergroup]).bypass_mode));
String timecode(time(NULL) + (infectionbypass ? (*ldl->fg[filtergroup]).infection_bypass_mode
: (*ldl->fg[filtergroup]).bypass_mode));
// use the standard key in normal bypass mode, and the infection key in infection bypass mode
String magic(infectionbypass ? ldl->fg[filtergroup]->imagic.c_str() : ldl->fg[filtergroup]->magic.c_str());
magic += clientip->c_str();
if(ldl->fg[filtergroup]->bypass_v2)
magic += user->c_str();
magic += timecode;
String res(infectionbypass ? "GIBYPASS=" : "GBYPASS=");
if (!url->after("://").contains("/")) {
String newurl((*url));
newurl += "/";
res += newurl.md5(magic.toCharArray());
} else {
res += url->md5(magic.toCharArray());
}
res += timecode;
#ifdef DGDEBUG
std::cerr << thread_id << " -generate Bypass hashedurl data " << clientip->c_str() << " " << *url << " " << clientuser << " " << timecode << " result " << res << std::endl;
#endif
return res;
}
// create temporary bypass cookie
String ConnectionHandler::hashedCookie(String *url, const char *magic, std::string *clientip, int bypasstimestamp) {
String timecode(bypasstimestamp);
String data(magic);
data += clientip->c_str();
// if(ldl->fg[filtergroup]->bypass_v2)
data += clientuser;
data += timecode;
#ifdef DGDEBUG
std::cerr << thread_id << " -generate Bypass hashedCookie data " << clientip->c_str() << " " << *url << " " << clientuser << " " << timecode << std::endl;
#endif
String res(url->md5(data.toCharArray()));
res += timecode;
#ifdef DGDEBUG
std::cerr << thread_id << " -Bypass hashedCookie=" << res << std::endl;
#endif
return res;
}
// is this a temporary filter bypass URL?
int ConnectionHandler::isBypassURL(String url, const char *magic, const char *clientip, bool *isvirusbypass, std::string &user)
{
if ((url).length() <= 45)
return false; // Too short, can't be a bypass
// check to see if this is a bypass URL, and which type it is
bool filterbypass = false;
bool virusbypass = false;
if ((isvirusbypass == NULL) && ((url).contains("GBYPASS="))) {
filterbypass = true;
} else if ((isvirusbypass != NULL) && (url).contains("GIBYPASS=")) {
virusbypass = true;
}
if (!(filterbypass || virusbypass))
return 0;
#ifdef DGDEBUG
std::cerr << thread_id << "URL " << (filterbypass ? "GBYPASS" : "GIBYPASS") << " found checking..." << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
String url_left((url).before(filterbypass ? "GBYPASS=" : "GIBYPASS="));
url_left.chop(); // remove the ? or &
String url_right((url).after(filterbypass ? "GBYPASS=" : "GIBYPASS="));
String url_hash(url_right.subString(0, 32));
String url_time(url_right.after(url_hash.toCharArray()));
#ifdef DGDEBUG
std::cerr << thread_id << "URL: " << url_left << ", HASH: " << url_hash << ", TIME: " << url_time << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
String mymagic(magic);
mymagic += clientip;
if(ldl->fg[filtergroup]->bypass_v2)
mymagic += user;
mymagic += url_time;
String hashed(url_left.md5(mymagic.toCharArray()));
if(ldl->fg[filtergroup]->cgi_bypass_v2) {
mymagic = hashed;
hashed = mymagic.md5(ldl->fg[filtergroup]->cgi_magic.c_str());
}
if (hashed != url_hash) {
#ifdef DGDEBUG
std::cerr << thread_id << "URL " << (filterbypass ? "GBYPASS" : "GIBYPASS") << " hash mismatch" << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
return 0;
}
time_t timen = time(NULL);
time_t timeu = url_time.toLong();
if (timeu < 1) {
#ifdef DGDEBUG
std::cerr << thread_id << "URL " << (filterbypass ? "GBYPASS" : "GIBYPASS") << " bad time value" << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
return 1; // bad time value
}
if (timeu < timen) { // expired key
#ifdef DGDEBUG
std::cerr << thread_id << "URL " << (filterbypass ? "GBYPASS" : "GIBYPASS") << " expired" << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
return 1; // denotes expired but there
}
#ifdef DGDEBUG
std::cerr << thread_id << "URL " << (filterbypass ? "GBYPASS" : "GIBYPASS") << " not expired" << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
if (virusbypass)
(*isvirusbypass) = true;
return (int)timeu;
}
// is this a scan bypass URL? i.e. a "magic" URL for retrieving a previously scanned file
bool ConnectionHandler::isScanBypassURL(String url, const char *magic, const char *clientip)
{
if ((url).length() <= 45)
return false; // Too short, can't be a bypass
if (!(url).contains("GSBYPASS=")) { // If this is not a bypass url
return false;
}
#ifdef DGDEBUG
std::cerr << thread_id << "URL GSBYPASS found checking..." << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
String url_left((url).before("GSBYPASS="));
url_left.chop(); // remove the ? or &
String url_right((url).after("GSBYPASS="));
String url_hash(url_right.subString(0, 32));
#ifdef DGDEBUG
std::cerr << thread_id << "URL: " << url_left << ", HASH: " << url_hash << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
// format is:
// GSBYPASS=hash(ip+url+tempfilename+mime+disposition+secret)
// &N=tempfilename&M=mimetype&D=dispos
String tempfilename(url_right.after("&N="));
String tempfilemime(tempfilename.after("&M="));
String tempfiledis(tempfilemime.after("&D="));
tempfilemime = tempfilemime.before("&D=");
tempfilename = tempfilename.before("&M=");
String tohash(clientip + url_left + tempfilename + tempfilemime + tempfiledis + magic);
String hashed(tohash.md5());
if(ldl->fg[filtergroup]->cgi_bypass_v2) {
tohash = hashed;
hashed = tohash.md5(ldl->fg[filtergroup]->cgi_magic.c_str());
}
#ifdef DGDEBUG
std::cerr << thread_id << "checking hash: " << clientip << " " << url_left << " " << tempfilename << " "
<< " " << tempfilemime << " " << tempfiledis << " " << magic << " " << hashed << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
if (hashed == url_hash) {
return true;
}
#ifdef DGDEBUG
std::cerr << thread_id << "URL GSBYPASS HASH mismatch" << " Line: " << __LINE__ << " Function: " << __func__ << std::endl;
#endif
return false;
}
// send a file to the client - used during bypass of blocked downloads
off_t
ConnectionHandler::sendFile(Socket *peerconn, NaughtyFilter &cm, String &url, bool is_icap, ICAPHeader *icap_head) {
String filedis = cm.tempfiledis;
int fd = open(cm.tempfilename.toCharArray(), O_RDONLY);
if (fd < 0) { // file access error
syslog(LOG_ERR, "%sError reading file to send", thread_id.c_str());
#ifdef DGDEBUG
std::cerr << thread_id << " -Error reading file to send:" << cm.tempfilename << std::endl;
#endif
String fnf(o.language_list.getTranslation(1230));
String head("HTTP/1.1 404 " + fnf + "\r\nContent-Type: text/html\r\n\r\n");
String body("<HTML><HEAD><TITLE>" + fnf + "</TITLE></HEAD><BODY><H1>" + fnf + "</H1></BODY></HTML>\r\n");
if (is_icap) {
icap_head->out_res_header = head;
icap_head->out_res_body = body;
icap_head->out_res_hdr_flag = true;
icap_head->out_res_body_flag = true;
icap_head->respond(*peerconn);
} else {
peerconn->writeString(head.toCharArray());
peerconn->writeString(body.toCharArray());
}
return 0;
}
off_t filesize = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
String head("HTTP/1.1 200 OK\r\nContent-Type: " + cm.tempfilemime + "\r\nContent-Length: " + String(filesize));
if (filedis.length() == 0) {
filedis = url.before("?");
while (filedis.contains("/"))
filedis = filedis.after("/");
}
head += "\r\nContent-disposition: attachment; filename=" + filedis;
head += "\r\n\r\n";
if (is_icap) {
icap_head->out_res_header = head;
icap_head->out_res_hdr_flag = true;
icap_head->out_res_body_flag = true;
icap_head->respond(*peerconn);
} else {
if (!peerconn->writeString(head.toCharArray())) {
close(fd);
return 0;
}
}
// perform the actual sending
off_t sent = 0;
int rc;
//char *buffer = new char[250000];
char *buffer = new char[64000];
while (sent < filesize) {
rc = readEINTR(fd, buffer, 64000);
#ifdef DGDEBUG
std::cerr << thread_id << " -reading send file rc:" << rc << std::endl;
#endif
if (rc < 0) {
#ifdef DGDEBUG
std::cerr << thread_id << " -error reading send file so aborting" << std::endl;
#endif
delete[] buffer;
// throw std::exception/();
//cleanThrow("error reading send file", *peerconn);
return 0;
}
if (rc == 0) {
#ifdef DGDEBUG
std::cerr << thread_id << " -got zero bytes reading send file" << std::endl;
#endif
break; // should never happen
}
if (is_icap) {
if (!peerconn->writeChunk(buffer, rc, 100000)) {
delete[] buffer;
peerDiag("Error sending file to client", *peerconn);
return 0;
}
} else {
// as it's cached to disk the buffer must be reasonably big
if (!peerconn->writeToSocket(buffer, rc, 0, 100000)) {
delete[] buffer;
peerDiag("Error sending file to client", *peerconn);
return 0;
// throw std::exception();
}
}
sent += rc;
#ifdef DGDEBUG
std::cerr << thread_id << " -total sent from temp:" << sent << std::endl;
#endif
}
if (is_icap) {
String n;
peerconn->writeChunkTrailer(n);
}
delete[] buffer;
close(fd);
return sent;
}
int
ConnectionHandler::connectUpstream(Socket &sock, NaughtyFilter &cm, int port = 0) // connects to to proxy or directly
{
if (port == 0)
port = cm.request_header->port;
String sport(port);
int lerr_mess = 0;
int retry = -1;
bool may_be_loop = false;
for (auto it = o.filter_ports.begin(); it != o.filter_ports.end(); it++) {
if (*it == sport) {
may_be_loop = true;
break;
}
}
#ifdef DGDEBUG
std::cerr << thread_id << "May_be_loop = " << may_be_loop << " " << " port " << port << std::endl;
#endif
while (++retry < o.connect_retries) {
lerr_mess = 0;
if (retry > 0) {
if (o.logconerror)
syslog(LOG_INFO, "%s retry %d to connect to %s", thread_id.c_str(), retry, cm.urldomain.c_str());
if (!sock.isTimedout())
usleep(1000); // don't hammer upstream
}
cm.upfailure = false;
if (cm.isdirect) {
String des_ip;
if (cm.isiphost) {
des_ip = cm.urldomain;
if (may_be_loop) { // check check_ip list
bool do_break = false;
if (o.check_ip.size() > 0) {
for (auto it = o.check_ip.begin(); it != o.check_ip.end(); it++) {
if (*it == des_ip) {
do_break = true;
lerr_mess = 212;
break;
}
}
}
if (do_break) break;
may_be_loop = false;
}
sock.setTimeout(o.connect_timeout);
#ifdef DGDEBUG
std::cerr << thread_id << "Connecting to IPHost " << des_ip << " port " << port << std::endl;
#endif
int rc = sock.connect(des_ip, port);
if (rc < 0) {
lerr_mess = 203;
continue;
}
return rc;
} else {
//dns lookup
struct addrinfo hints, *infoptr;
memset(&hints, 0, sizeof(addrinfo));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = 0;
hints.ai_protocol = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
int rc = getaddrinfo(cm.connect_site.toCharArray(), NULL, &hints, &infoptr);
if (rc) // problem
{
#ifdef DGDEBUG
std::cerr << thread_id << "connectUpstream: getaddrinfo returned " << rc << " for " << cm.connect_site << " " << gai_strerror(rc) << std::endl;
#endif
bool rt = false;
switch (rc) {
case EAI_NONAME:
lerr_mess = 207;
break;
#ifdef EAI_NODATA
case EAI_NODATA:
lerr_mess = 208;
break;
#endif
case EAI_AGAIN:
lerr_mess = 209;
rt = true;
break;
case EAI_FAIL:
lerr_mess = 210;
break;
default:
lerr_mess = 210; //TODO this should have it's own message??
break;
}
sock.close();
if (rt) continue;
else break;
}
char t[256];
struct addrinfo *p;
for (p = infoptr; p != NULL; p = p->ai_next) {
getnameinfo(p->ai_addr, p->ai_addrlen, t, sizeof(t), NULL, 0, NI_NUMERICHOST);
if (may_be_loop) { // check check_ip list
bool do_break = false;
if (o.check_ip.size() > 0) {
for (auto it = o.check_ip.begin(); it != o.check_ip.end(); it++) {
if (*it == t) {
do_break = true;
lerr_mess = 212;
break;
}
}
}
if (do_break) break;
may_be_loop = false;
}
#ifdef DGDEBUG
std::cerr << thread_id << "Connecting to IP " << t << " port " << port << std::endl;
#endif
int rc = sock.connect(t, port);
if (rc == 0) {
freeaddrinfo(infoptr);
#ifdef DGDEBUG
std::cerr << thread_id << "Got connection upfailure is " << cm.upfailure << std::endl;
#endif
return 0;
}
}
freeaddrinfo(infoptr);
if (may_be_loop) break;
lerr_mess = 203;
continue;
}
} else { //is via proxy
sock.setTimeout(o.proxy_timeout);
int rc = sock.connect(o.proxy_ip, o.proxy_port);
if (rc < 0) {
if (sock.isTimedout())
lerr_mess = 201;
else
lerr_mess = 202;
continue;
}
return rc;
}
}
// only get here if failed
cm.upfailure = true;
cm.message_no = lerr_mess;
cm.whatIsNaughty = "";
cm.whatIsNaughtyLog = "";
cm.isItNaughty = true;
cm.blocktype = 3;
cm.isexception = false;
cm.isbypass = false;
return -1;
}
// pass data between proxy and client, filtering as we go.
// this is the only public function of ConnectionHandler
int ConnectionHandler::handlePeer(Socket &peerconn, String &ip, stat_rec *&dystat, unsigned int lc_type) {
persistent_authed = false;
is_real_user = false;
int rc = 0;
//#ifdef DGDEBUG
// for debug info only - TCP peer port
//thread_id = peerconn.getPeerSourcePort();
//#endif
Socket proxysock; // also used for direct connection
switch (lc_type) {
case CT_PROXY:
rc = handleConnection(peerconn, ip, false, proxysock, dystat);
break;
#ifdef __SSLMITM
case CT_THTTPS:
rc = handleTHTTPSConnection(peerconn, ip, proxysock, dystat);
break;
#endif
case CT_ICAP:
rc = handleICAPConnection(peerconn, ip, proxysock, dystat);
break;
}
//if ( ldl->reload_id != load_id)
// rc = -1;
return rc;
}
int ConnectionHandler::handleConnection(Socket &peerconn, String &ip, bool ismitm, Socket &proxysock,
stat_rec *&dystat) {
struct timeval thestart;
gettimeofday(&thestart, NULL);
//peerconn.setTimeout(o.proxy_timeout);
peerconn.setTimeout(o.pcon_timeout);
// ldl = o.currentLists();
HTTPHeader docheader(__HEADER_RESPONSE); // to hold the returned page header from proxy
HTTPHeader header(__HEADER_REQUEST); // to hold the incoming client request headeri(ldl)
// set a timeout as we don't want blocking 4 eva
// this also sets how long a peerconn will wait for other requests
header.setTimeout(o.pcon_timeout);
docheader.setTimeout(o.exchange_timeout);
//int bypasstimestamp = 0;
// Content scanning plugins to use for request (POST) & response data
std::deque<CSPlugin *> requestscanners;
std::deque<CSPlugin *> responsescanners;
std::string clientip(ip.toCharArray()); // hold the clients ip
header.setClientIP(ip);
if (clienthost) delete clienthost;
clienthost = NULL; // and the hostname, if available
matchedip = false;
// clear list of parameters extracted from URL
urlparams.clear();
// clear out info about POST data
postparts.clear();
#ifdef DGDEBUG // debug stuff surprisingly enough
std::cerr << thread_id << " -got peer connection" << std::endl;
std::cerr << thread_id << clientip << std::endl;
#endif
try {
//int rc;
#ifdef DGDEBUG
int pcount = 0;
#endif
// assume all requests over the one persistent connection are from
// the same user. means we only need to query the auth plugin until
// we get credentials, then assume they are valid for all reqs. on
// the persistent connection.
std::string oldclientuser;
std::string room;
//int oldfg = 0;
bool authed = false;
//bool isbanneduser = false;
//bool isscanbypass = false;
//bool isbypass = false;
//bool isvirusbypass = false;
//int bypasstimestamp = 0;
//bool iscookiebypass = false;
AuthPlugin *auth_plugin = NULL;
// RFC states that connections are persistent
bool persistOutgoing = true;
bool persistPeer = true;
bool persistProxy = true;
String last_domain_port;
bool last_isdirect = false;
bool firsttime = true;
if (!header.in(&peerconn, true)) { // get header from client, allowing persistency
if (o.logconerror) {
if (peerconn.getFD() > -1) {
int err = peerconn.getErrno();
//int pport = peerconn.getPeerSourcePort();
std::string peerIP = peerconn.getPeerIP();
syslog(LOG_INFO, "%s No header recd from client at %s - errno: %d", thread_id.c_str(),
peerIP.c_str(), err);
#ifdef DGDEBUG
std::cerr << thread_id << " No header recd from client - errno: " << err << std::endl;
#endif
} else {
syslog(LOG_INFO, "%s Client connection closed early - no request header received",
thread_id.c_str());
}
}
firsttime = false;
persistPeer = false;
} else {
++dystat->reqs;
}
//
// End of set-up section
//
// Start of main loop
//
// maintain a persistent connection
while ((firsttime || persistPeer) && !ttg)
// while ((firsttime || persistPeer) && !reloadconfig)
{
#ifdef DGDEBUG
std::cerr << thread_id << " firsttime =" << firsttime << "ismitm =" << ismitm << " clientuser =" << clientuser << " group = " << filtergroup << std::endl;
#endif
ldl = o.currentLists();
NaughtyFilter checkme(header, docheader);
DataBuffer docbody;
docbody.setTimeout(o.exchange_timeout);
FDTunnel fdt;
if (firsttime) {
// reset flags & objects next time round the loop
firsttime = false;
gettimeofday(&thestart, NULL);
checkme.thestart = thestart;
// quick trick for the very first connection :-)
if (!ismitm)
persistProxy = false;
} else {
// another round...
#ifdef DGDEBUG
std::cerr << thread_id << " -persisting (count " << ++pcount << ")" << std::endl;
// syslog(LOG_ERR, "Served %d requests on this connection so far - ismitm=%d", pcount, ismitm);
std::cerr << thread_id << " - " << clientip << std::endl;
#endif
header.reset();
if (!header.in(&peerconn, true)) {
#ifdef DGDEBUG
std::cerr << thread_id << " -Persistent connection closed" << std::endl;
#endif
break;
}
++dystat->reqs;
// we will actually need to do *lots* of resetting of flags etc. here for pconns to work
gettimeofday(&thestart, NULL);
checkme.thestart = thestart;
checkme.bypasstimestamp = 0;
authed = false;
requestscanners.clear();
responsescanners.clear();
matchedip = false;
urlparams.clear();
postparts.clear();
checkme.mimetype = "-";
room = ""; // CHECK THIS - surely room is persistant?????
// reset docheader & docbody
// headers *should* take care of themselves on the next in()
// actually not entirely true for docheader - we may read
// certain properties of it (in denyAccess) before we've
// actually performed the next in(), so make sure we do a full
// reset now.
docheader.reset();
docbody.reset();
peerconn.resetChunk();
proxysock.resetChunk();
}
//
// do this normalisation etc just the once at the start.
checkme.setURL(ismitm);
if(o.log_requests) {
std::string fnt;
if(ismitm)
fnt = "MITM";
else if(header.isProxyRequest) {
fnt = "PROXY";
} else fnt = "TRANS";
doRQLog(clientuser, clientip, checkme, fnt);
}
//If proxy connection is not persistent..// do this later after checking if direct or via proxy
#ifdef DGDEBUG
std::cerr << thread_id << getpid() << "Start URL " << checkme.url.c_str() << "is_ssl=" << checkme.is_ssl << "ismitm=" << ismitm << std::endl;
#endif
// checks for bad URLs to prevent security holes/domain obfuscation.
if (header.malformedURL(checkme.url)) {
// The requested URL is malformed.
writeback_error(checkme, peerconn, 200, 0, "400 Bad Request");
proxysock.close(); // close connection to proxy
break;
}
// TODO this needs moving is proxy operation is still to be tested
if (checkme.urldomain == "internal.test.e2guardian.org") {
peerconn.writeString(
"HTTP/1.1 200 \nContent-Type: text/html\n\n<HTML><HEAD><TITLE>e2guardian internal test</TITLE></HEAD><BODY><H1>e2guardian internal test OK</H1> ");
peerconn.writeString("</BODY></HTML>\n");
proxysock.close(); // close connection to proxy
break;
}
// total block list checking now done in pre-auth story
// don't let the client connection persist if the client doesn't want it to.
persistOutgoing = header.isPersistent();
// now check if in input proxy mode and direct upstream if upstream needs closing
if (persistProxy && last_isdirect &&
((last_domain_port != checkme.urldomainport)|| !o.no_proxy)) {
proxysock.close();
persistProxy = false;
}
last_domain_port = checkme.urldomainport;
last_isdirect = checkme.isdirect;
//
//
// Now check if machine is banned and room-based checking
//
//
// is this user banned?
//isbanneduser = false;
if (o.use_xforwardedfor && !ismitm) { // don't do this for mitm
bool use_xforwardedfor;
if (o.xforwardedfor_filter_ip.size() > 0) {
use_xforwardedfor = false;
for (unsigned int i = 0; i < o.xforwardedfor_filter_ip.size(); i++) {
if (strcmp(clientip.c_str(), o.xforwardedfor_filter_ip[i].c_str()) == 0) {
use_xforwardedfor = true;
break;
}
}
} else {
use_xforwardedfor = true;
}
if (use_xforwardedfor == 1) {
std::string xforwardip(header.getXForwardedForIP());
if (xforwardip.length() > 6) {
clientip = xforwardip;
ip = clientip;
header.setClientIP(ip);
}
#ifdef DGDEBUG
std::cerr << thread_id << " -using x-forwardedfor:" << clientip << std::endl;
#endif
}
}
checkme.clientip = clientip;
// Look up reverse DNS name of client if needed
if (o.reverse_client_ip_lookups) {
getClientFromIP(clientip.c_str(),checkme.clienthost);
// std::unique_ptr<std::deque<String> > hostnames;
// hostnames.reset(ipToHostname(clientip.c_str()));
// checkme.clienthost = std::string(hostnames->front().toCharArray());
}
//CALL SB pre-authcheck
ldl->StoryA.runFunctEntry(ENT_STORYA_PRE_AUTH, checkme);
#ifdef DGDEBUG
std::cerr << "After StoryA pre-authcheck" << checkme.isexception << " mess_no "
<< checkme.message_no << std::endl;
#endif
checkme.isItNaughty = checkme.isBlocked;
bool isbannedip = checkme.isBlocked;
bool part_banned;
if (isbannedip) {
// matchedip = clienthost == NULL;
} else {
if (ldl->inRoom(clientip, room, &(checkme.clienthost), &isbannedip, &part_banned, &checkme.isexception,
checkme.urld)) {
#ifdef DGDEBUG
std::cerr << " isbannedip = " << isbannedip << "ispart_banned = " << part_banned << " isexception = " << checkme.isexception << std::endl;
#endif
if (isbannedip) {
// matchedip = clienthost == NULL;
checkme.isBlocked = checkme.isItNaughty = true;
}
if (checkme.isexception) {
// do reason codes etc
checkme.exceptionreason = o.language_list.getTranslation(630);
checkme.exceptionreason.append(room);
checkme.exceptionreason.append(o.language_list.getTranslation(631));
checkme.message_no = 632;
}
}
}
#ifdef ENABLE_ORIG_IP
// if working in transparent mode and grabbing of original IP addresses is
// enabled, does the original IP address match one of those that the host
// we are going to resolves to?
// Resolves http://www.kb.cert.org/vuls/id/435052
if (o.get_orig_ip) {
// XXX This will currently only work on Linux/Netfilter.
sockaddr_in origaddr;
socklen_t origaddrlen(sizeof(sockaddr_in));
// Note: we assume that for non-redirected connections, this getsockopt call will
// return the proxy server's IP, and not -1. Hence, comparing the result with
// the return value of Socket::getLocalIP() should tell us that the client didn't
// connect transparently, and we can assume they aren't vulnerable.
if (getsockopt(peerconn.getFD(), SOL_IP, SO_ORIGINAL_DST, &origaddr, &origaddrlen) < 0) {
syslog(LOG_ERR, "Failed to get client's original destination IP: %s", strerror(errno));
break;
}
char res[INET_ADDRSTRLEN];
std::string orig_dest_ip(inet_ntop(AF_INET,&origaddr.sin_addr, res, sizeof(res)));
if (orig_dest_ip == peerconn.getLocalIP()) {
// The destination IP before redirection is the same as the IP the
// client has actually been connected to - they aren't connecting transparently.
#ifdef DGDEBUG
std::cerr << thread_id << " -SO_ORIGINAL_DST and getLocalIP are equal; client not connected transparently" << std::endl;
#endif
} else {
// Look up domain from request URL, and check orig IP against resolved IPs
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
addrinfo *results;
int result = getaddrinfo(checkme.urldomain.c_str(), NULL, &hints, &results);
if (result) {
freeaddrinfo(results);
syslog(LOG_ERR, "Cannot resolve hostname for host header checks: %s", gai_strerror(errno));
break;
}
addrinfo *current = results;
bool matched = false;
while (current != NULL) {
char res[INET_ADDRSTRLEN];
if (orig_dest_ip == inet_ntop(AF_INET,&((sockaddr_in *)(current->ai_addr))->sin_addr, res, sizeof(res))) {
#ifdef DGDEBUG
std::cerr << thread_id << checkme.urldomain << " matched to original destination of " << orig_dest_ip << std::endl;
#endif
matched = true;