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NwInterface.cpp
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NwInterface.cpp
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/*
*
* (C) 2021-24 - ntop.org
*
*
* This program 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.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "include.h"
#define TOO_MANY_INVALID_ATTEMPTS 3
#define NUM_PURGE_LOOP 300
/* #define DEBUG */
#ifdef __linux__
/* Forward */
int netfilter_callback(struct nfq_q_handle *qh, struct nfgenmsg *nfmsg,
struct nfq_data *nfa, void *data);
#endif
/* **************************************************** */
NwInterface::NwInterface(u_int nf_device_id,
Configuration *_c,
GeoIP *_g, std::string c_path) {
conf = _c, geoip = _g, confPath = c_path;
reloaderThread = NULL;
ifaceRunning = false;
fw = NULL;
#ifdef __linux__
fw = new LinuxFirewall();
#else
#if defined __FreeBSD__
fw = new FreeBSDFirewall();
#endif
#endif
#ifdef __linux__
queueId = nf_device_id, nfHandle = nfq_open();
if(nfHandle == NULL) {
trace->traceEvent(TRACE_ERROR, "Unable to get netfilter handle [queueId=%d]", queueId);
throw 1;
}
if(nfq_unbind_pf(nfHandle, AF_INET) < 0) {
trace->traceEvent(TRACE_ERROR, "Unable to unbind [queueId=%d]: are you root ?", queueId);
throw 1;
}
if(nfq_bind_pf(nfHandle, AF_INET) < 0) {
trace->traceEvent(TRACE_ERROR, "Unable to bind [queueId=%d]", queueId);
throw 1;
}
if((queueHandle = nfq_create_queue(nfHandle, queueId, &netfilter_callback, this)) == NULL) {
trace->traceEvent(TRACE_ERROR, "Unable to attach to NF_QUEUE %d: is it already in use?", queueId);
throw 1;
} else
trace->traceEvent(TRACE_NORMAL, "Successfully connected to NF_QUEUE %d", queueId);
#if !defined(__mips__)
nfnl_rcvbufsiz(nfq_nfnlh(nfHandle), NF_BUFFER_SIZE);
#endif
if(nfq_set_mode(queueHandle, NFQNL_COPY_PACKET, 0XFFFF) < 0) {
trace->traceEvent(TRACE_ERROR, "Unable to set packet_copy mode");
throw 1;
}
if(nfq_set_queue_maxlen(queueHandle, NF_MAX_QUEUE_LEN) < 0) {
trace->traceEvent(TRACE_ERROR, "Unable to set queue len");
throw 1;
}
nf_fd = nfq_fd(nfHandle);
#endif
if(!conf->getZMQUrl().empty()) {
std::string url = conf->getZMQUrl();
std::string enc = conf->getZMQEncryptionKey();
zmq = new ZMQ(url.c_str(), enc.c_str());
} else
zmq = NULL;
flush_ban();
}
/* **************************************************** */
NwInterface::~NwInterface() {
#ifndef __linux__
if(pcap_handle != NULL)
pcap_close(pcap_handle);
#endif
for(u_int i=0, s = pipes.size(); i < s; i++)
pclose(pipes[i]);
for(std::unordered_map<std::string, WatchMatches*>::iterator it = watches_blacklist.begin();
it != watches_blacklist.end(); it++)
delete it->second;
/* Wait until the reload thread ends */
if(reloaderThread) {
reloaderThread->join();
delete reloaderThread;
}
#ifdef __linux__
nf_fd = 0;
#endif
flush_ban();
#ifdef __linux__
if(queueHandle) nfq_destroy_queue(queueHandle);
if(nfHandle) nfq_close(nfHandle);
#endif
logStartStop(false /* stop */);
if(zmq) delete zmq;
if(fw) delete fw;
}
/* **************************************************** */
#ifdef __linux__
int netfilter_callback(struct nfq_q_handle *qh,
struct nfgenmsg *nfmsg,
struct nfq_data *nfa,
void *data) {
const u_char *payload;
struct nfqnl_msg_packet_hdr *ph = nfq_get_msg_packet_hdr(nfa);
/* The HW address is readeable only at certain hook points and it is the source address */
struct nfqnl_msg_packet_hw *hdr = nfq_get_packet_hw(nfa);
NwInterface *iface = (NwInterface *)data;
u_int payload_len;
u_int32_t id = ph ? ntohl(ph->packet_id) : 0;
u_int16_t marker;
u_int8_t null_mac[6] = {0};
if(!ph) return(-1);
#ifdef HAVE_NFQ_SET_VERDICT2
payload_len = nfq_get_payload(nfa, (unsigned char **)&payload);
#else
payload_len = nfq_get_payload(nfa, (char **)&payload);
#endif
marker = iface->dissectPacket(hdr ? true : false, payload, payload_len).get();
return(nfq_set_verdict2(qh, id, NF_ACCEPT, marker, 0, NULL));
}
#endif
/* **************************************************** */
void NwInterface::packetPollLoop() {
struct nfq_handle *h;
int fd;
std::vector<bool> geo_ip_pipes;
u_int num_loops = 0;
loadTemporarelyBannedHosts(conf->getDumpPath());
watches = conf->get_watches();
/* Spawn reload config thread in background */
reloaderThread = new std::thread(&NwInterface::reloadConfLoop, this);
/* Start watches */
for(std::unordered_map<std::string, std::pair<std::string, bool>>::iterator it = watches->begin(); it != watches->end(); it++) {
std::pair<std::string, bool> item = it->second;
FILE *watcher = popen(item.first.c_str(), "r");
if(watcher == NULL) {
trace->traceEvent(TRACE_ERROR, "Unable to run watch %s", item.first.c_str());
} else {
fd = fileno(watcher);
pipes.push_back(watcher);
fcntl(fd, F_SETFL, O_NONBLOCK);
pipes_fileno.push_back(std::make_pair(fd, it->first));
geo_ip_pipes.push_back(item.second); /* true = geo-ip, false = block-ip */
trace->traceEvent(TRACE_NORMAL, "Added watch %s [%s]", item.first.c_str(), item.first.c_str());
}
}
ifaceRunning = true;
logStartStop(true /* start */);
#ifdef __linux__
h = get_nfHandle();
fd = get_fd();
#else
char errbuf[PCAP_ERRBUF_SIZE];
pcap_handle = pcap_open_live(conf->getInterfaceName(), 1600, 0 /* promisc */, 1000, errbuf);
if(pcap_handle == NULL) {
trace->traceEvent(TRACE_ERROR, "Unable to open %s: %s",
conf->getInterfaceName(), errbuf);
exit(1);
} else
pcap_handle_fileno = pcap_fileno(pcap_handle);
#endif
while(isRunning()) {
fd_set mask;
struct timeval wait_time;
int max_fd = fd, num, id;
char pktBuf[65536] __attribute__ ((aligned));
FD_ZERO(&mask);
FD_SET(fd, &mask);
for(u_int i=0, s = pipes_fileno.size(); i < s; i++) {
int fd = pipes_fileno[i].first;
FD_SET(fd, &mask);
if(fd > max_fd)
max_fd = fd;
}
#ifndef __linux__
if(pcap_handle_fileno != -1) {
FD_SET(pcap_handle_fileno, &mask);
if(pcap_handle_fileno > max_fd)
max_fd = pcap_handle_fileno;
}
#endif
wait_time.tv_sec = 1, wait_time.tv_usec = 0;
id = num = select(max_fd+1, &mask, 0, 0, &wait_time);
num_loops++;
if(num > 0) {
#ifdef __linux__
if(FD_ISSET(fd, &mask)) {
/* Socket data */
int len = recv(fd, pktBuf, sizeof(pktBuf), 0);
// trace->traceEvent(TRACE_INFO, "Pkt len %d", len);
if(len >= 0) {
int rc = nfq_handle_packet(h, pktBuf, len);
if(rc < 0)
trace->traceEvent(TRACE_ERROR, "nfq_handle_packet() failed: [len: %d][rc: %d][errno: %d]", len, rc, errno);
} else {
trace->traceEvent(TRACE_ERROR, "NF_QUEUE receive error: [len: %d][errno: %d]", len, errno);
break;
}
num--;
}
#endif
/* Watches */
for(u_int i=0, s = pipes_fileno.size(); i < s; i++) {
if(FD_ISSET(pipes_fileno[i].first, &mask)) {
char ip[64];
while(fgets(ip, sizeof(ip), pipes[i]) != NULL) {
char ip_country[3]={}, ip_continent[3]={};
#ifdef DEBUG
trace->traceEvent(TRACE_ERROR, "Watch %s received %s", pipes_fileno[i].second, ip);
#endif
ip[strlen(ip)-1] = '\0'; /* Zap trailing /n */
geoip->lookup(ip, ip_country, sizeof(ip_country), ip_continent, sizeof(ip_continent));
if(geo_ip_pipes[i] == true /* geo-ip */) {
/*
In this case we need to check if the returned IP
has to be geographically banned or not
*/
if(strchr(ip, ':') == NULL) {
/* IPv4 */
struct in_addr ip_addr;
ip_addr.s_addr = inet_addr(ip);
if(conf->isBlacklistedIPv4(&ip_addr))
ban(ip, true, true, "ban-" + pipes_fileno[i].second, ip_country);
} else {
/* IPv6 */
struct in6_addr ip_addr;
inet_pton(AF_INET6, ip, &ip_addr);
if(conf->isBlacklistedIPv6(&ip_addr))
ban(ip, true, true, "ban-" + pipes_fileno[i].second, ip_country);
}
if(ip_country[0] != '\0') {
if(conf->getMarker(ip_country, ip_continent).get() != conf->getMarkerPass().get())
ban(ip, true, true, "ban-" + pipes_fileno[i].second, ip_country);
}
} else {
/* In this case the IP has to be banned immediately */
ban(ip, true, true, "ban-" + pipes_fileno[i].second, ip_country);
}
}
}
} /* for */
#ifndef __linux__
if(FD_ISSET(pcap_handle_fileno, &mask)) {
struct pcap_pkthdr hdr;
const u_char *packet = pcap_next(pcap_handle, &hdr);
if(packet != NULL) {
struct ndpi_ethhdr *e = (struct ndpi_ethhdr*)packet;
u_int16_t l3_proto = ntohs(e->h_proto);
if((l3_proto == ETHERTYPE_IP) || (l3_proto == ETHERTYPE_IPV6)) {
/* IPv4 or IPv6 */
u_int16_t marker = dissectPacket(true, &packet[sizeof(ndpi_ethhdr)],
hdr.caplen - sizeof(ndpi_ethhdr)).get();
if(marker == conf->getMarkerDrop().get()) {
/* Eventually do an action */
}
}
}
}
#endif
}
if((id == 0) || (num_loops > NUM_PURGE_LOOP)) {
harvestWatches();
num_loops = 0;
}
if(shadowConf != NULL) {
/* Swap configurations */
delete conf;
conf = shadowConf;
shadowConf = NULL;
trace->traceEvent(TRACE_NORMAL, "New configuration has been updated");
}
} /* while */
saveTemporarelyBannedHosts(conf->getDumpPath());
trace->traceEvent(TRACE_NORMAL, "Leaving packet poll loop");
ifaceRunning = false;
}
/* **************************************************** */
Marker NwInterface::dissectPacket(bool is_ingress_packet,
const u_char *payload, u_int payload_len) {
/* We can see only IP addresses */
u_int16_t ip_offset = 0, vlan_id = 0 /* FIX */;
if(payload_len >= ip_offset) {
struct ndpi_iphdr *iph = (struct ndpi_iphdr *)&payload[ip_offset];
bool ipv4 = false, ipv6 = false;
struct ndpi_tcphdr *tcph = NULL;
struct ndpi_udphdr *udph = NULL;
u_int16_t src_port, dst_port;
u_int8_t proto, ip_payload_offset = 40 /* ipv6 is 40B long */;
char src[INET6_ADDRSTRLEN] = {}, dst[INET6_ADDRSTRLEN] = {};
if(iph->version == 6) {
struct ndpi_ipv6hdr *ip6h = (struct ndpi_ipv6hdr *)&payload[ip_offset];
ipv6 = true;
proto = ip6h->ip6_hdr.ip6_un1_nxt;
// ipv6 address stringification
inet_ntop(AF_INET6, &(ip6h->ip6_src), src, sizeof(src));
inet_ntop(AF_INET6, &(ip6h->ip6_dst), dst, sizeof(dst));
} else if(iph->version == 4) {
ipv4 = true;
u_int8_t frag_off = ntohs(iph->frag_off);
struct in_addr a;
if((iph->protocol == IPPROTO_UDP) && ((frag_off & 0x3FFF /* IP_MF | IP_OFFSET */) != 0))
return(conf->getMarkerUnknown()); /* Don't block it */
// get protocol and offset
proto = iph->protocol;
ip_payload_offset = iph->ihl * 4;
// ipv4 address stringification
a.s_addr = iph->saddr, inet_ntop(AF_INET, &a, src, sizeof(src));
a.s_addr = iph->daddr, inet_ntop(AF_INET, &a, dst, sizeof(dst));
} else { // Neither ipv4 or ipv6...unlikely to be evaluated
return(conf->getMarkerPass());
}
u_int8_t *nxt = ((u_int8_t *)iph + ip_payload_offset);
switch (proto) {
case IPPROTO_TCP:
tcph = (struct ndpi_tcphdr *)(nxt);
src_port = tcph->source, dst_port = tcph->dest;
break;
case IPPROTO_UDP:
udph = (struct ndpi_udphdr *)(nxt);
src_port = udph->source, dst_port = udph->dest;
break;
default:
// we do not care about ports in other protocols
src_port = dst_port = 0;
}
return(makeVerdict(is_ingress_packet,
proto, vlan_id,
src_port, dst_port,
src, dst, ipv4, ipv6));
}
return(conf->getMarkerPass());
}
/* **************************************************** */
const char* NwInterface::getProtoName(u_int8_t proto) {
switch(proto) {
case IPPROTO_TCP: return("TCP");
case IPPROTO_UDP: return("UDP");
case IPPROTO_ICMP: return("ICMP");
default: return("???");
}
}
/* **************************************************** */
bool NwInterface::isPrivateIPv4(u_int32_t addr /* network byte order */) {
addr = ntohl(addr);
if(((addr & 0xFF000000) == 0x0A000000 /* 10.0.0.0/8 */)
|| ((addr & 0xFFF00000) == 0xAC100000 /* 172.16.0.0/12 */)
|| ((addr & 0xFFFF0000) == 0xC0A80000 /* 192.168.0.0/16 */)
|| ((addr & 0xFF000000) == 0x7F000000 /* 127.0.0.0/8 */)
|| ((addr & 0xFFFF0000) == 0xA9FE0000 /* 169.254.0.0/16 Link-Local communication rfc3927 */)
)
return(true);
else
return(false);
}
/* **************************************************** */
bool NwInterface::isBroadMulticastIPv4(u_int32_t addr /* network byte order */) {
addr = ntohl(addr);
if((addr == 0xFFFFFFFF /* 255.255.255.255 */)
|| (addr == 0x0 /* 0.0.0.0 */)
|| ((addr & 0xF0000000) == 0xE0000000 /* 224.0.0.0/4 */))
return(true);
else
return(false);
}
/* **************************************************** */
bool NwInterface::isPrivateIPv6(struct ndpi_in6_addr addr) {
bool is_link_local, is_unique_local;
u_int32_t first_byte = ntohl(addr.u6_addr.u6_addr32[0]);
is_link_local = (first_byte & (0xffc00000)) == (0xfe800000); // check the first 10 bits
is_unique_local = (first_byte & (0xfe000000)) == (0xfc000000); // check the first 7 bits
return(is_unique_local || is_link_local);
}
/* **************************************************** */
void NwInterface::addCommonJSON(Json::Value *root) {
(*root)["source"]["ip"] = conf->getHostIP();
(*root)["source"]["name"] = conf->getHostName();
(*root)["source"]["epoch"] = (unsigned int)time(NULL);
(*root)["source"]["version"] = std::string(PACKAGE_NAME) + std::string(" ") + std::string(IPT_RELEASE);
}
/* **************************************************** */
void NwInterface::logHostBan(char *host_ip,
bool ban_ip, bool ban_traffic,
std::string reason,
std::string country) {
Json::Value root;
std::string json_txt;
Json::FastWriter writer;
addCommonJSON(&root);
root["reason"] = (reason.size() > 0) ? reason.c_str() : "watch-host-ban";
root["host"] = host_ip;
if(!country.empty()) root["country"] = country.c_str();
root["action"] = ban_ip ? "ban" : "unban";
json_txt = writer.write(root);
trace->traceEvent(TRACE_INFO, "%s", json_txt.c_str());
if(zmq)
zmq->sendMessage(ZMQ_TOPIC_NAME, json_txt.c_str());
sendTelegramMessage(json_txt);
if(!conf->getCmd(ban_ip).empty()) {
std::string cmd = conf->getCmd(ban_ip) + " " + host_ip;
conf->execDeferredCmd(cmd);
}
#ifdef HAVE_NTOP_CLOUD
if(cloud && ban_ip) {
cloud->ban(host_ip,
ban_traffic ? bl_geofence_monitored_port : bl_geofence_watch,
(char*)reason.c_str(),
(char*)(ban_ip ? "ban" : "unban"),
(char*)country.c_str(),
(char*)conf->getHostIP(),
(char*)conf->getHostName(),
(char*)(std::string(PACKAGE_NAME) + std::string(" ") + std::string(IPT_RELEASE)).c_str());
}
#endif
}
/* **************************************************** */
void NwInterface::logStartStop(bool start) {
Json::Value root;
std::string json_txt;
Json::FastWriter writer;
addCommonJSON(&root);
root["action"] = start ? "start" : "stop";
json_txt = writer.write(root);
trace->traceEvent(TRACE_NORMAL, "%s", json_txt.c_str());
if(zmq)
zmq->sendMessage(ZMQ_TOPIC_NAME, json_txt.c_str());
sendTelegramMessage(json_txt);
}
/* **************************************************** */
void NwInterface::logFlow(const char *proto_name,
char *src_host, u_int16_t sport, char *src_country, char *src_continent, bool src_blacklisted,
char *dst_host, u_int16_t dport, char *dst_country, char *dst_continent, bool dst_blacklisted,
bool pass_verdict) {
Json::Value root;
std::string json_txt;
Json::FastWriter writer;
addCommonJSON(&root);
root["reason"] = "flow-ban";
root["proto"] = proto_name;
root["src"]["host"] = src_host;
root["src"]["port"] = sport;
if(src_country && (src_country[0] != '\0')) root["src"]["country"] = src_country;
if(src_continent && (src_continent[0] != '\0')) root["src"]["continent"] = src_continent;
if(src_blacklisted) root["src"]["blacklisted"] = src_blacklisted;
root["dst"]["host"] = dst_host;
root["dst"]["port"] = dport;
if(dst_country && (dst_country[0] != '\0')) root["dst"]["country"] = dst_country;
if(dst_continent && (dst_continent[0] != '\0')) root["dst"]["continent"] = dst_continent;
if(dst_blacklisted) root["dst"]["blacklisted"] = dst_blacklisted;
root["verdict"] = pass_verdict ? "pass" : "drop";
json_txt = writer.write(root);
if(pass_verdict)
trace->traceEvent(TRACE_INFO, "%s", json_txt.c_str());
else {
trace->traceEvent(TRACE_INFO, "%s", json_txt.c_str());
if(zmq)
zmq->sendMessage(ZMQ_TOPIC_NAME, json_txt.c_str());
// sendTelegramMessage(json_txt);
}
}
/* **************************************************** */
Marker NwInterface::makeVerdict(bool is_ingress_packet,
u_int8_t proto, u_int16_t vlanId,
u_int16_t sport /* network byte order */,
u_int16_t dport /* network byte order */,
char *src_host, char *dst_host,
bool ipv4, bool ipv6) {
// Step 0 - Check ip protocol
if(!(ipv4 || ipv6)) return(conf->getDefaultPolicy());
struct in_addr in;
char src_country[3]={}, dst_country[3]={}, src_continent[3]={}, dst_continent[3]={} ;
const char *proto_name = getProtoName(proto);
Marker m, src_marker, dst_marker;
u_int16_t _dport = dport;
bool drop = false;
sport = ntohs(sport), dport = ntohs(dport);
geoip->lookup(src_host, src_country, sizeof(src_country), src_continent, sizeof(src_continent));
geoip->lookup(dst_host, dst_country, sizeof(dst_country), dst_continent, sizeof(dst_continent));
/* ******************************************************* */
/* Check if sender/recipient are blacklisted */
if(ipv4) {
u_int32_t saddr = inet_addr(src_host), daddr = inet_addr(dst_host);
/* Broadcast source (e.g. for DHCP) traffic shoud paas */
if(isBroadMulticastIPv4(daddr))
return(conf->getMarkerPass());
/* For all ports/protocols, check if sender/recipient are white/black-listed and if so, pass/block this flow */
in.s_addr = saddr;
if(conf->isWhitelistedIPv4(&in)) {
return(conf->getMarkerPass()); /* Whitelisted IP (src) */
}
if(conf->isBlacklistedIPv4(&in)) {
logFlow(proto_name,
src_host, sport, src_country, src_continent, true,
dst_host, dport, dst_country, dst_continent, false,
false /* drop */);
// trace->traceEvent(TRACE_ERROR, "(1) %s <-> %s", src_host, dst_host);
ban(src_host, true /* ban */, true, "blacklisted-client", src_country);
return(conf->getMarkerDrop());
}
in.s_addr = daddr;
if(conf->isWhitelistedIPv4(&in)) {
return(conf->getMarkerPass()); /* Whitelisted IP (dst) */
}
if(conf->isBlacklistedIPv4(&in)) {
logFlow(proto_name,
src_host, sport, src_country, src_continent, false,
dst_host, dport, dst_country, dst_continent, true,
false /* drop */);
// trace->traceEvent(TRACE_ERROR, "(2) %s <-> %s", src_host, dst_host);
ban(dst_host, true /* ban */, true, "blacklisted-server", dst_country);
return(conf->getMarkerDrop());
}
// trace->traceEvent(TRACE_ERROR, "(3) %s <-> %s", src_host, dst_host);
} else if(ipv6) {
struct in6_addr a;
inet_pton(AF_INET6, src_host, &a);
if(conf->isBlacklistedIPv6(&a)) {
logFlow(proto_name,
src_host, sport, src_country, src_continent, true,
dst_host, dport, dst_country, dst_continent, false,
false /* drop */);
ban(src_host, true /* ban */, true, "blacklisted-client", src_country);
return(conf->getMarkerDrop());
}
inet_pton(AF_INET6, dst_host, &a);
if(conf->isBlacklistedIPv6(&a)) {
logFlow(proto_name,
src_host, sport, src_country, src_continent, false,
dst_host, dport, dst_country, dst_continent, true,
false /* drop */);
ban(dst_host, true /* ban */, true, "blacklisted-server", dst_country);
return(conf->getMarkerDrop());
}
}
/* ******************************************************* */
/* Pass flows on ignored ports */
if(conf->isIgnoredPort(sport) || conf->isIgnoredPort(dport)) {
logFlow(proto_name,
src_host, sport, src_country, src_continent, false,
dst_host, dport, dst_country, dst_continent, false,
true /* pass */);
return(conf->getMarkerPass());
}
/* ******************************************************* */
/* Check honeypot ports and (eventually) ban host */
if(is_ingress_packet && conf->isProtectedPort(dport)) {
char str[128];
logFlow(proto_name,
src_host, sport, src_country, src_continent, false,
dst_host, dport, dst_country, dst_continent, false,
false /* drop */);
snprintf(str, sizeof(str), "ban-honeypot-%d", dport);
ban(src_host, true /* ban */, true, str, src_country);
return(conf->getMarkerDrop());
}
/* ******************************************************* */
/* On TCP/UDP ignore traffic for non-monitored ports (country blacklists won't apply here) */
switch(proto) {
case IPPROTO_TCP:
if((conf->isMonitoredTCPPort(sport)) || conf->isMonitoredTCPPort(dport))
;
else {
trace->traceEvent(TRACE_INFO, "Ignoring TCP ports %u/%u", sport, dport);
return(conf->getMarkerPass());
}
break;
case IPPROTO_UDP:
if((conf->isMonitoredUDPPort(sport)) || conf->isMonitoredUDPPort(dport))
;
else {
trace->traceEvent(TRACE_INFO, "Ignoring UDP ports %u/%u", sport, dport);
return(conf->getMarkerPass());
}
break;
}
/* ******************************************************* */
m = src_marker = dst_marker = conf->getDefaultPolicy();
/* For monitored TCP/UDP ports (and ICMP) check the country blacklist */
if(src_country[0] != '\0') {
src_marker = conf->getMarker(src_country, src_continent);
} else {
/* Unknown or private IP address */
src_marker = conf->getMarkerPass();
}
if(dst_country[0] != '\0') {
dst_marker = conf->getMarker(dst_country, dst_continent);
} else {
/* Unknown or private IP address */
dst_marker = conf->getMarkerPass();
}
/* Final step: compute the flow verdict */
if((src_marker.get() == conf->getMarkerPass().get())
&& (dst_marker.get() == conf->getMarkerPass().get())) {
m = conf->getMarkerPass();
logFlow(proto_name,
src_host, sport, src_country, src_continent, false,
dst_host, dport, dst_country, dst_continent, false,
true /* pass */);
} else {
std::string msg = "ban-monitored-port-" + std::to_string(dport);
m = conf->getMarkerDrop();
logFlow(proto_name,
src_host, sport, src_country, src_continent, false,
dst_host, dport, dst_country, dst_continent, false,
false /* drop */);
if((proto == IPPROTO_TCP) || (proto == IPPROTO_UDP)) /* Ignore non TCP/UDP */
ban(src_host, true /* ban */, true, msg, src_country);
}
return(m);
}
/* **************************************************** */
u_int32_t NwInterface::computeNextReloadTime() {
u_int32_t confReloadTimeout = 86400 /* once a day */;
u_int32_t now = time(NULL);
u_int32_t next_reload = now + confReloadTimeout;
/* Align to the midnight */
next_reload -= (next_reload % confReloadTimeout);
return(next_reload);
}
/* **************************************************** */
void NwInterface::reloadConfLoop() {
u_int32_t next_reload = computeNextReloadTime();
shadowConf = NULL;
trace->traceEvent(TRACE_NORMAL, "Starting reload configuration loop");
while(isRunning()) {
u_int32_t now = time(NULL);
if(now > next_reload) {
trace->traceEvent(TRACE_NORMAL, "Reloading config file");
if(shadowConf != NULL) {
/* Too early */
trace->traceEvent(TRACE_WARNING, "An existing configuration is already available: trying again");
next_reload = now + 300; /* 5 mins */
} else {
Configuration *newConf = new Configuration();
newConf->readConfigFile(this->confPath.c_str());
if(newConf->isConfigured()) {
shadowConf = newConf;
}
else
trace->traceEvent(TRACE_ERROR, "Something went wrong: please check the JSON config file");
next_reload = computeNextReloadTime();
}
} else {
// trace->traceEvent(TRACE_INFO, "Will reload in %u sec", next_reload-now);
/* Important: make a short nap as we need to exit this thread during shutdown */
sleep(1); /* Too early */
}
} /* while */
trace->traceEvent(TRACE_NORMAL, "Reload configuration loop is over");
}
/* **************************************************** */
void NwInterface::harvestWatches() {
u_int32_t when = time(NULL) - MAX_IDLENESS;
#ifdef DEBUG
trace->traceEvent(TRACE_NORMAL, "NwInterface::harvestWatches()");
#endif
for(std::unordered_map<std::string, WatchMatches*>::iterator it = watches_blacklist.begin();
it != watches_blacklist.end();) {
WatchMatches *match = it->second;
#ifdef DEBUG
trace->traceEvent(TRACE_NORMAL, "last_match=%u / now=%u [to go: %d]",
match->get_last_match(), when, (match->get_last_match() - when));
#endif
if(match->ready_to_harvest(when)) {
#ifdef DEBUG
trace->traceEvent(TRACE_NORMAL, "Harvesting");
#endif
ban((char*)it->first.c_str(), false /* unban */, false, "unban", "");
delete it->second;
watches_blacklist.erase(it++); // or "it = m.erase(it)" since C++11
} else
++it;
}
}
/* **************************************************** */
void NwInterface::ban(char *host, bool ban_ip,
bool ban_traffic, std::string reason, std::string country) {
char cmdbuf[128];
bool is_ipv4 = (strchr(host, ':') == NULL) ? true /* IPv4 */ : false /* IPv6 */;
std::unordered_map<std::string, WatchMatches*>::iterator it = watches_blacklist.find(std::string(host));
// trace->traceEvent(TRACE_NORMAL, "*** %s ***", host);
if(ban_ip) {
/* Ban */
if(it == watches_blacklist.end()) {
/* New ban */
try {
u_int32_t until_time = time(NULL) + DEFAULT_BAN_TIME;
WatchMatches *watch = new WatchMatches(1, until_time);
trace->traceEvent(TRACE_INFO, "First time (until: %u) banning %s [%s]",
until_time, host, reason.c_str());
watches_blacklist[host] = watch;
if(fw) fw->ban(host, is_ipv4);
logHostBan(host, ban_ip, ban_traffic, reason, country);
} catch(std::bad_alloc& ex) {
trace->traceEvent(TRACE_WARNING, "Not enough memory");
}
} else {
WatchMatches *watch = it->second;
u_int32_t until_time;
u_int32_t num_matches;
/* Host already banned */
watch->inc_matches();
num_matches = watch->get_num_matches();
until_time = time(NULL) + (DEFAULT_BAN_TIME * num_matches * num_matches);
trace->traceEvent(TRACE_INFO, "Recurrent (times: %d/until: %u) time banning %s [%s]",
watch->get_num_matches(), until_time,
host, reason.c_str());
watch->ban_until(until_time);
}
} else {
/* Unban */
if(fw) fw->unban(host, is_ipv4);
logHostBan(host, ban_ip, ban_traffic, reason, country);
}
}
/* **************************************************** */
void NwInterface::ban_ipv4(u_int32_t ip4 /* network byte order */, bool ban_ip,
std::string reason, std::string country) {
char ipbuf[32], *host = Utils::intoaV4(ntohl(ip4), ipbuf, sizeof(ipbuf));
ban(host, ban_ip, true, reason, country);
}
/* **************************************************** */
void NwInterface::ban_ipv6(struct ndpi_in6_addr ip6, bool ban_ip,
std::string reason, std::string country) {
char ipbuf[64], *host = Utils::intoaV6(ip6, 128, ipbuf, sizeof(ipbuf));
ban(host, ban_ip, true, reason, country);
}
/* **************************************************** */
void NwInterface::flush_ban() {
try {
#ifdef __linux__
Utils::execCmd("/usr/sbin/iptables -F IPT_GEOFENCE_BLACKLIST");
Utils::execCmd("/usr/sbin/ip6tables -F IPT_GEOFENCE_BLACKLIST");
#endif
} catch (...) {
trace->traceEvent(TRACE_ERROR, "Error while flushing blacklists");
}
}
/* **************************************************** */
int NwInterface::sendTelegramMessage(std::string message) {
return(conf->sendTelegramMessage(message));
}
/* ****************************************** */
bool NwInterface::loadTemporarelyBannedHosts(const char* path) {
std::ifstream infile(path);
std::string line;
u_int32_t num_entries = 0;
if(!infile.is_open()) {
trace->traceEvent(TRACE_WARNING, "Unable to open file %s", path);
return(false);
}
while(getline(infile, line)) {
char item[256], *ip, *num_bans;
if((line[0] == '#') || (line[0] == '\0'))
continue;
// trace->traceEvent(TRACE_INFO, "Adding %s", line.c_str());
/* Format: IP\tnum_bans */
snprintf(item, sizeof(item), "%s", line.c_str());
ip = strtok(item, "\t");