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nids.c
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/* nids.c -- Functions for dealing with libnids
*
* Copyright 2012 AOL Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this Software except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include "glib.h"
#include "nids.h"
#include "pcap.h"
#include "magic.h"
#include "moloch.h"
/******************************************************************************/
extern MolochConfig_t config;
extern GMainLoop *mainLoop;
extern gboolean debug;
extern uint32_t pluginsCbs;
extern void *esServer;
static MolochSessionHead_t tcpSessionQ;
static MolochSessionHead_t udpSessionQ;
static MolochSessionHead_t icmpSessionQ;
static MolochSessionHead_t tcpWriteQ;
static int64_t dumperFilePos = 0;
static int dumperBufPos = 0;
static int dumperBufMax = 0;
static int dumperFd = -1;
static char dumperBuf[0x1fffff + 4096];
static uint32_t dumperId;
static uint32_t initialDropped = 0;
uint64_t totalPackets = 0;
uint64_t totalBytes = 0;
uint64_t totalSessions = 0;
/******************************************************************************/
extern gchar *interface;
extern gchar *pcapFile;
extern gchar *pcapDir;
extern gboolean fakePcap;
extern gboolean dryRun;
HASH_VAR(h_, sessions, MolochSessionHead_t, 199337);
/******************************************************************************/
void moloch_nids_session_free (MolochSession_t *session);
void moloch_nids_process_udp(MolochSession_t *session, struct udphdr *udphdr, unsigned char *data, int len);
int moloch_nids_next_file();
void moloch_nids_init_nids();
/******************************************************************************/
uint32_t moloch_nids_session_hash(const void *key)
{
char *p = (char *)key;
return (p[4] & 0xff) << 24 | (p[6] & 0xff) << 16 | (p[10] & 0xff) << 8 | (p[12] & 0xff);
}
/******************************************************************************/
int moloch_nids_session_cmp(const void *keyv, const void *elementv)
{
unsigned char *key = (unsigned char*)keyv;
MolochSession_t *element = (MolochSession_t *)elementv;
if (key[0] != element->protocol) return 0;
if (element->addr1 < element->addr2) {
return key[5] == ((element->port1 >> 8) & 0xff) &&
key[6] == (element->port1 & 0xff) &&
key[11] == ((element->port2 >> 8) & 0xff) &&
key[12] == (element->port2 & 0xff) &&
memcmp(key + 1, &element->addr1, 4) == 0 &&
memcmp(key + 7, &element->addr2, 4) == 0;
} else {
return key[5] == ((element->port2 >> 8) & 0xff) &&
key[6] == (element->port2 & 0xff) &&
key[11] == ((element->port1 >> 8) & 0xff) &&
key[12] == (element->port1 & 0xff) &&
memcmp(key + 1, &element->addr2, 4) == 0 &&
memcmp(key + 7, &element->addr1, 4) == 0;
}
}
/******************************************************************************/
void moloch_nids_certs_free (MolochCertsInfo_t *certs)
{
MolochString_t *string;
while (DLL_POP_HEAD(s_, &certs->alt, string)) {
free(string->str);
free(string);
}
while (DLL_POP_HEAD(s_, &certs->issuer.commonName, string)) {
free(string->str);
free(string);
}
while (DLL_POP_HEAD(s_, &certs->subject.commonName, string)) {
free(string->str);
free(string);
}
if (certs->issuer.orgName)
free(certs->issuer.orgName);
if (certs->subject.orgName)
free(certs->subject.orgName);
if (certs->serialNumber)
free(certs->serialNumber);
free(certs);
}
/******************************************************************************/
uint32_t moloch_nids_certs_hash(const void *key)
{
MolochCertsInfo_t *ci = (MolochCertsInfo_t *)key;
return ((ci->serialNumber[0] << 28) |
(ci->serialNumber[ci->serialNumberLen-1] << 24) |
(ci->issuer.commonName.s_count << 18) |
(ci->issuer.orgName?ci->issuer.orgName[0] << 12:0) |
(ci->subject.commonName.s_count << 6) |
(ci->subject.orgName?ci->subject.orgName[0]:0));
}
/******************************************************************************/
int moloch_nids_certs_cmp(const void *keyv, const void *elementv)
{
MolochCertsInfo_t *key = (MolochCertsInfo_t *)keyv;
MolochCertsInfo_t *element = (MolochCertsInfo_t *)elementv;
if ( !((key->serialNumberLen == element->serialNumberLen) &&
(memcmp(key->serialNumber, element->serialNumber, element->serialNumberLen) == 0) &&
(key->issuer.commonName.s_count == element->issuer.commonName.s_count) &&
(key->issuer.orgName == element->issuer.orgName || strcmp(key->issuer.orgName, element->issuer.orgName) == 0) &&
(key->subject.commonName.s_count == element->subject.commonName.s_count) &&
(key->subject.orgName == element->subject.orgName || strcmp(key->subject.orgName, element->subject.orgName) == 0)
)
) {
return 0;
}
MolochString_t *kstr, *estr;
for (kstr = key->issuer.commonName.s_next, estr = element->issuer.commonName.s_next;
kstr != (void *)&(key->issuer.commonName);
kstr = kstr->s_next, estr = estr->s_next) {
if (strcmp(kstr->str, estr->str) != 0)
return 0;
}
for (kstr = key->subject.commonName.s_next, estr = element->subject.commonName.s_next;
kstr != (void *)&(key->subject.commonName);
kstr = kstr->s_next, estr = estr->s_next) {
if (strcmp(kstr->str, estr->str) != 0)
return 0;
}
return 1;
}
/******************************************************************************/
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
#define int_ntoa(x) inet_ntoa(*((struct in_addr *)(int*)&x))
char *moloch_friendly_session_id (int protocol, uint32_t addr1, int port1, uint32_t addr2, int port2)
{
static char buf[1000];
int len;
if (addr1 < addr2) {
len = snprintf(buf, sizeof(buf), "%d;%s:%i,", protocol, int_ntoa(addr1), port1);
snprintf(buf+len, sizeof(buf) - len, "%s:%i", int_ntoa(addr2), port2);
} else {
len = snprintf(buf, sizeof(buf), "%d;%s:%i,", protocol, int_ntoa(addr2), port2);
snprintf(buf+len, sizeof(buf) - len, "%s:%i", int_ntoa(addr1), port1);
}
return buf;
}
#define MOLOCH_SESSIONID_LEN 13
/******************************************************************************/
void moloch_session_id (char *buf, int protocol, uint32_t addr1, uint16_t port1, uint32_t addr2, uint16_t port2)
{
buf[0] = protocol;
if (addr1 < addr2) {
memcpy(buf + 1, &addr1, 4);
buf[5] = (port1 >> 8) & 0xff;
buf[6] = port1 & 0xff;
memcpy(buf + 7, &addr2, 4);
buf[11] = (port2 >> 8) & 0xff;
buf[12] = port2 & 0xff;
} else {
memcpy(buf + 1, &addr2, 4);
buf[5] = (port2 >> 8) & 0xff;
buf[6] = port2 & 0xff;
memcpy(buf + 7, &addr1, 4);
buf[11] = (port1 >> 8) & 0xff;
buf[12] = port1 & 0xff;
}
}
/******************************************************************************/
void moloch_nids_save_session(MolochSession_t *session)
{
if (session->outstandingQueries > 0) {
session->needSave = 1;
if (session->tcp_next) {
DLL_REMOVE(tcp_, &tcpWriteQ, session);
}
switch (session->protocol) {
case IPPROTO_TCP:
DLL_REMOVE(q_, &tcpSessionQ, session);
break;
case IPPROTO_UDP:
DLL_REMOVE(q_, &udpSessionQ, session);
break;
case IPPROTO_ICMP:
DLL_REMOVE(q_, &icmpSessionQ, session);
break;
}
HASH_REMOVE(h_, sessions, session);
return;
}
moloch_db_save_session(session, TRUE);
HASH_REMOVE(h_, sessions, session);
moloch_nids_session_free(session);
}
/******************************************************************************/
void moloch_nids_mid_save_session(MolochSession_t *session)
{
if (!session->rootId) {
session->rootId = "ROOT";
}
moloch_db_save_session(session, FALSE);
g_array_free(session->filePosArray, TRUE);
session->filePosArray = g_array_sized_new(FALSE, FALSE, 8, 1024);
g_array_free(session->fileNumArray, TRUE);
session->fileNumArray = g_array_new(FALSE, FALSE, 4);
g_ptr_array_free(session->urlArray, TRUE);
session->urlArray = g_ptr_array_new_with_free_func(g_free);
MolochString_t *string;
HASH_FORALL_POP_HEAD(s_, session->hosts, string,
free(string->str);
free(string);
);
HASH_FORALL_POP_HEAD(s_, session->userAgents, string,
free(string->str);
free(string);
);
MolochInt_t *mi;
HASH_FORALL_POP_HEAD(i_, session->xffs, mi,
free(mi);
);
if (session->tcp_next) {
DLL_REMOVE(tcp_, &tcpWriteQ, session);
DLL_PUSH_TAIL(tcp_, &tcpWriteQ, session);
}
session->lastSave = nids_last_pcap_header->ts.tv_sec;
session->bytes = 0;
session->databytes = 0;
moloch_detect_initial_tag(session);
}
/******************************************************************************/
char *pcapFilename;
void moloch_nids_file_create()
{
pcap_dumper_t *dumper;
if (dryRun) {
pcapFilename = "dryrun.pcap";
dumperFd = 1;
return;
}
pcapFilename = moloch_db_create_file(nids_last_pcap_header->ts.tv_sec, &dumperId);
dumper = pcap_dump_open(nids_params.pcap_desc, pcapFilename);
if (!dumper) {
LOG("ERROR - pcap open failed - Couldn't open file: '%s'", pcapFilename);
exit (1);
}
pcap_dump_close(dumper);
dumperFilePos = 24;
dumperBufPos = 0;
dumperBufMax = config.pcapWriteSize - 24;
dumperFd = open(pcapFilename, O_LARGEFILE | O_NOATIME | O_WRONLY );
if (dumperFd < 0) {
LOG("ERROR - pcap open failed - Couldn't open file: '%s' with %d", pcapFilename, errno);
exit (2);
}
lseek(dumperFd, 24, SEEK_SET);
}
/******************************************************************************/
void moloch_nids_file_flush(gboolean all)
{
int pos = 0;
int amount;
if (dryRun) {
return;
}
all |= (dumperBufPos <= dumperBufMax);
if (all) {
amount = dumperBufPos;
} else {
amount = dumperBufMax;
}
while (pos < amount) {
int len = write(dumperFd, dumperBuf+pos, amount-pos);
if (len < 0) {
LOG("ERROR - Write failed with %d %d\n", len, errno);
exit (0);
}
pos += len;
}
if (all) {
dumperBufPos = 0;
} else {
dumperBufPos = dumperBufPos - dumperBufMax;
memmove(dumperBuf, dumperBuf+dumperBufMax, dumperBufPos);
}
dumperBufMax = config.pcapWriteSize;
}
/******************************************************************************/
struct pcap_timeval {
int32_t tv_sec; /* seconds */
int32_t tv_usec; /* microseconds */
};
struct pcap_sf_pkthdr {
struct pcap_timeval ts; /* time stamp */
uint32_t caplen; /* length of portion present */
uint32_t len; /* length this packet (off wire) */
};
void
moloch_nids_pcap_dump(const struct pcap_pkthdr *h, const u_char *sp)
{
struct pcap_sf_pkthdr hdr;
hdr.ts.tv_sec = h->ts.tv_sec;
hdr.ts.tv_usec = h->ts.tv_usec;
hdr.caplen = h->caplen;
hdr.len = h->len;
memcpy(dumperBuf+dumperBufPos, (char *)&hdr, sizeof(hdr));
dumperBufPos += sizeof(hdr);
memcpy(dumperBuf+dumperBufPos, sp, h->caplen);
dumperBufPos += h->caplen;
}
/******************************************************************************/
void moloch_nids_cb_ip(struct ip *packet, int len)
{
char sessionId[MOLOCH_SESSIONID_LEN];
MolochSession_t *headSession;
struct tcphdr *tcphdr = 0;
struct udphdr *udphdr = 0;
MolochSessionHead_t *sessionsQ;
uint32_t sessionTimeout;
switch (packet->ip_p) {
case IPPROTO_TCP:
sessionsQ = &tcpSessionQ;
sessionTimeout = config.tcpTimeout;
tcphdr = (struct tcphdr *)((void*)packet + 4 * packet->ip_hl);
moloch_session_id(sessionId, packet->ip_p, packet->ip_src.s_addr, ntohs(tcphdr->source),
packet->ip_dst.s_addr, ntohs(tcphdr->dest));
break;
case IPPROTO_UDP:
sessionsQ = &udpSessionQ;
sessionTimeout = config.udpTimeout;
udphdr = (struct udphdr *)((void*)packet + 4 * packet->ip_hl);
moloch_session_id(sessionId, packet->ip_p, packet->ip_src.s_addr, ntohs(udphdr->source),
packet->ip_dst.s_addr, ntohs(udphdr->dest));
break;
case IPPROTO_ICMP:
sessionsQ = &icmpSessionQ;
sessionTimeout = config.icmpTimeout;
moloch_session_id(sessionId, packet->ip_p, packet->ip_src.s_addr, 0,
packet->ip_dst.s_addr, 0);
break;
case IPPROTO_IPV6:
return;
default:
if (pluginsCbs & MOLOCH_PLUGIN_IP)
moloch_plugins_cb_ip(NULL, packet, len);
if (config.logUnknownProtocols)
LOG("Unknown protocol %d", packet->ip_p);
return;
}
totalBytes += len;
if (totalPackets == 1) {
struct pcap_stat ps;
if (!pcap_stats(nids_params.pcap_desc, &ps)) {
initialDropped = ps.ps_drop;
}
LOG("%ld Initial Dropped = %d", totalPackets, initialDropped);
}
if ((++totalPackets) % config.logEveryXPackets == 0) {
struct pcap_stat ps;
if (pcap_stats(nids_params.pcap_desc, &ps)) {
ps.ps_drop = 0;
ps.ps_recv = totalPackets;
ps.ps_ifdrop = 0;
}
headSession = DLL_PEEK_HEAD(q_, sessionsQ);
LOG("packets: %lu current sessions: %u/%u oldest: %d - recv: %u drop: %u (%0.2f) ifdrop: %u queue: %d",
totalPackets,
sessionsQ->q_count,
HASH_COUNT(h_, sessions),
(int)(nids_last_pcap_header->ts.tv_sec - (headSession->lastPacket + sessionTimeout)),
ps.ps_recv,
ps.ps_drop - initialDropped, (ps.ps_drop - initialDropped)*100.0/ps.ps_recv,
ps.ps_ifdrop,
moloch_http_queue_length(esServer));
}
/* Get or Create Session */
MolochSession_t *session;
HASH_FIND(h_, sessions, sessionId, session);
if (!session) {
//LOG ("New session: %s", sessionId);
session = malloc(sizeof(MolochSession_t));
memset(session, 0, sizeof(MolochSession_t));
session->protocol = packet->ip_p;
session->filePosArray = g_array_sized_new(FALSE, FALSE, 8, 100);
session->fileNumArray = g_array_new(FALSE, FALSE, 4);
session->urlArray = g_ptr_array_new_with_free_func(g_free);
HASH_INIT(s_, session->hosts, moloch_string_hash, moloch_string_cmp);
HASH_INIT(s_, session->users, moloch_string_hash, moloch_string_cmp);
HASH_INIT(s_, session->userAgents, moloch_string_hash, moloch_string_cmp);
HASH_INIT(i_, session->xffs, moloch_int_hash, moloch_int_cmp);
HASH_INIT(t_, session->certs, moloch_nids_certs_hash, moloch_nids_certs_cmp);
HASH_ADD(h_, sessions, sessionId, session);
session->lastSave = session->firstPacket = nids_last_pcap_header->ts.tv_sec;
session->addr1 = packet->ip_src.s_addr;
session->addr2 = packet->ip_dst.s_addr;
moloch_detect_initial_tag(session);
switch (packet->ip_p) {
case IPPROTO_TCP:
/* If a syn & ack that means the first packet is actually the syn-ack
* reply, the syn probably got dropped */
if ((tcphdr->syn) && (tcphdr->ack)) {
session->addr1 = packet->ip_dst.s_addr;
session->addr2 = packet->ip_src.s_addr;
session->port1 = ntohs(tcphdr->dest);
session->port2 = ntohs(tcphdr->source);
} else {
session->port1 = ntohs(tcphdr->source);
session->port2 = ntohs(tcphdr->dest);
}
break;
case IPPROTO_UDP:
session->port1 = ntohs(udphdr->source);
session->port2 = ntohs(udphdr->dest);
break;
case IPPROTO_ICMP:
session->port1 = 0;
session->port2 = 0;
break;
}
DLL_PUSH_TAIL(q_, sessionsQ, session);
if (pluginsCbs & MOLOCH_PLUGIN_NEW)
moloch_plugins_cb_new(session);
} else {
DLL_REMOVE(q_, sessionsQ, session);
DLL_PUSH_TAIL(q_, sessionsQ, session);
}
session->bytes += len;
session->lastPacket = nids_last_pcap_header->ts.tv_sec;
if (pluginsCbs & MOLOCH_PLUGIN_IP)
moloch_plugins_cb_ip(session, packet, len);
if (packet->ip_p == IPPROTO_UDP) {
session->databytes += (len - 8);
moloch_nids_process_udp(session, udphdr, (unsigned char*)udphdr+8, len - 8 - 4 * packet->ip_hl);
}
if (!dryRun && !session->dontSave) {
/* Save packet to file */
if (dumperFd == -1 || dumperFilePos >= config.maxFileSizeG*1024LL*1024LL*1024LL) {
if (dumperFd > 0 && !dryRun) {
moloch_nids_file_flush(TRUE);
close(dumperFd);
}
moloch_nids_file_create();
}
uint64_t val = dumperFilePos | ((uint64_t)dumperId << 36);
g_array_append_val(session->filePosArray, val);
if (session->fileNumArray->len == 0 || g_array_index(session->fileNumArray, uint32_t, session->fileNumArray->len-1) != dumperId) {
g_array_append_val(session->fileNumArray, dumperId);
}
if (fakePcap) {
dumperBuf[dumperBufPos] = 'P';
dumperBufPos++;
} else {
moloch_nids_pcap_dump(nids_last_pcap_header, nids_last_pcap_data);
dumperFilePos += 16 + nids_last_pcap_header->caplen;
}
if (dumperBufPos > dumperBufMax) {
moloch_nids_file_flush(FALSE);
}
if (session->filePosArray->len >= config.maxPackets) {
moloch_nids_mid_save_session(session);
}
}
/* Clean up the Q, only 1 per incoming packet so we don't fall behind */
if ((headSession = DLL_PEEK_HEAD(q_, sessionsQ)) &&
(headSession->lastPacket + sessionTimeout < nids_last_pcap_header->ts.tv_sec)) {
if (packet->ip_p == IPPROTO_TCP && headSession->haveNidsTcp) {
//LOG("Saving because of at head %s", moloch_friendly_session_id(headSession->protocol, headSession->addr1, headSession->port1, headSession->addr2, headSession->port2));
headSession->lastPacket = nids_last_pcap_header->ts.tv_sec;
DLL_REMOVE(q_, sessionsQ, headSession);
DLL_PUSH_TAIL(q_, sessionsQ, headSession);
moloch_nids_mid_save_session(headSession);
} else
moloch_nids_save_session(headSession);
}
if ((headSession = DLL_PEEK_HEAD(tcp_, &tcpWriteQ)) &&
(headSession->lastSave + config.tcpSaveTimeout < nids_last_pcap_header->ts.tv_sec)) {
//LOG("Saving because of timeout %s", moloch_friendly_session_id(headSession->protocol, headSession->addr1, headSession->port1, headSession->addr2, headSession->port2));
moloch_nids_mid_save_session(headSession);
}
}
/******************************************************************************/
void moloch_nids_incr_outstanding(MolochSession_t *session)
{
session->outstandingQueries++;
}
/******************************************************************************/
void moloch_nids_decr_outstanding(MolochSession_t *session)
{
session->outstandingQueries--;
if (session->needSave && session->outstandingQueries == 0) {
moloch_db_save_session(session, TRUE);
moloch_nids_session_free(session);
}
}
/******************************************************************************/
void moloch_nids_get_tag_cb(MolochSession_t *session, int tagtype, uint32_t tag)
{
g_hash_table_insert(session->tags[tagtype], (void *)(long)tag, (void *)1);
moloch_nids_decr_outstanding(session);
}
/******************************************************************************/
void moloch_nids_add_tag(MolochSession_t *session, int tagtype, const char *tag) {
moloch_nids_incr_outstanding(session);
moloch_db_get_tag(session, tagtype, tag, moloch_nids_get_tag_cb);
if (!session->dontSave && HASH_COUNT(s_, config.dontSaveTags)) {
MolochString_t *tstring;
HASH_FIND(s_, config.dontSaveTags, tag, tstring);
if (tstring) {
session->dontSave = 1;
}
}
}
/******************************************************************************/
void moloch_nids_cb_tcp(struct tcp_stream *a_tcp, void *UNUSED(params))
{
MolochSession_t *session;
char key[1024];
//LOG("TCP (%d) - %s", a_tcp->nids_state, moloch_friendly_session_id(IPPROTO_TCP, a_tcp->addr.saddr, a_tcp->addr.source, a_tcp->addr.daddr, a_tcp->addr.dest));
//fflush(stdout);
switch (a_tcp->nids_state) {
case NIDS_JUST_EST:
moloch_session_id(key, IPPROTO_TCP, a_tcp->addr.saddr, a_tcp->addr.source, a_tcp->addr.daddr, a_tcp->addr.dest);
HASH_FIND(h_, sessions, key, session);
if (session) {
session->haveNidsTcp = 1;
DLL_PUSH_TAIL(tcp_, &tcpWriteQ, session);
a_tcp->user = session;
a_tcp->client.collect++;
a_tcp->server.collect++;
} else {
LOG("ERROR - no session for %s", moloch_friendly_session_id(IPPROTO_TCP, a_tcp->addr.saddr, a_tcp->addr.source, a_tcp->addr.daddr, a_tcp->addr.dest));
}
if (pluginsCbs & MOLOCH_PLUGIN_TCP)
moloch_plugins_cb_tcp(session, a_tcp);
return;
case NIDS_DATA:
session = a_tcp->user;
if (!session) {
LOG("ERROR - data - a_tcp->user not set for %s", moloch_friendly_session_id(IPPROTO_TCP, a_tcp->addr.saddr, a_tcp->addr.source, a_tcp->addr.daddr, a_tcp->addr.dest));
a_tcp->client.collect = 0;
a_tcp->server.collect = 0;
return;
}
if (a_tcp->client.count_new) {
session->which = 1;
moloch_detect_parse_http(session, a_tcp, &a_tcp->client);
moloch_detect_parse_classify(session, a_tcp, &a_tcp->client);
moloch_detect_parse_yara(session, a_tcp, &a_tcp->client);
nids_discard(a_tcp, session->offsets[1]);
session->offsets[1] = a_tcp->client.count_new;
}
if (a_tcp->server.count_new) {
session->which = 0;
moloch_detect_parse_http(session, a_tcp, &a_tcp->server);
moloch_detect_parse_classify(session, a_tcp, &a_tcp->server);
moloch_detect_parse_yara(session, a_tcp, &a_tcp->server);
nids_discard(a_tcp, session->offsets[0]);
session->offsets[0] = a_tcp->server.count_new;
}
session->databytes += a_tcp->server.count_new + a_tcp->client.count_new;
if (pluginsCbs & MOLOCH_PLUGIN_TCP)
moloch_plugins_cb_tcp(session, a_tcp);
return;
default:
session = a_tcp->user;
if (!session) {
LOG("ERROR - default (%d) - a_tcp->user not set for %s", a_tcp->nids_state, moloch_friendly_session_id(IPPROTO_TCP, a_tcp->addr.saddr, a_tcp->addr.source, a_tcp->addr.daddr, a_tcp->addr.dest));
return;
}
if (a_tcp->client.count != a_tcp->client.offset) {
moloch_detect_parse_yara(session, a_tcp, &a_tcp->client);
}
if (a_tcp->server.count != a_tcp->server.offset) {
moloch_detect_parse_yara(session, a_tcp, &a_tcp->server);
}
//LOG("TCP %d ", a_tcp->nids_state);
moloch_nids_save_session(session);
a_tcp->user = 0;
if (pluginsCbs & MOLOCH_PLUGIN_TCP)
moloch_plugins_cb_tcp(session, a_tcp);
return;
}
}
/******************************************************************************/
void moloch_nids_session_free (MolochSession_t *session)
{
if (session->q_next) {
switch (session->protocol) {
case IPPROTO_TCP:
DLL_REMOVE(q_, &tcpSessionQ, session);
break;
case IPPROTO_UDP:
DLL_REMOVE(q_, &udpSessionQ, session);
break;
case IPPROTO_ICMP:
DLL_REMOVE(q_, &icmpSessionQ, session);
break;
}
}
if (session->tcp_next)
DLL_REMOVE(tcp_, &tcpWriteQ, session);
g_array_free(session->filePosArray, TRUE);
g_array_free(session->fileNumArray, TRUE);
g_ptr_array_free(session->urlArray, TRUE);
MolochString_t *string;
HASH_FORALL_POP_HEAD(s_, session->hosts, string,
free(string->str);
free(string);
);
HASH_FORALL_POP_HEAD(s_, session->users, string,
free(string->str);
free(string);
);
HASH_FORALL_POP_HEAD(s_, session->userAgents, string,
free(string->str);
free(string);
);
MolochCertsInfo_t *certs;
HASH_FORALL_POP_HEAD(t_, session->certs, certs,
moloch_nids_certs_free(certs);
);
if (session->urlString)
g_string_free(session->urlString, TRUE);
if (session->hostString)
g_string_free(session->hostString, TRUE);
if (session->uaString)
g_string_free(session->uaString, TRUE);
if (session->xffString)
g_string_free(session->xffString, TRUE);
if (session->rootId)
g_free(session->rootId);
int i;
for (i = 0; i < MOLOCH_TAG_MAX; i++) {
g_hash_table_destroy(session->tags[i]);
}
free(session);
}
/******************************************************************************/
void moloch_nids_syslog(int type, int errnum, struct ip *iph, void *data)
{
char saddr[20], daddr[20];
switch (type) {
case NIDS_WARN_IP:
if (errnum != NIDS_WARN_IP_HDR) {
strcpy(saddr, int_ntoa(iph->ip_src.s_addr));
strcpy(daddr, int_ntoa(iph->ip_dst.s_addr));
LOG("NIDSIP:%s %s, packet (apparently) from %s to %s",
pcapFilename, nids_warnings[errnum], saddr, daddr);
} else
LOG("NIDSIP:%s %s",
pcapFilename, nids_warnings[errnum]);
break;
case NIDS_WARN_TCP:
strcpy(saddr, int_ntoa(iph->ip_src.s_addr));
strcpy(daddr, int_ntoa(iph->ip_dst.s_addr));
if (errnum == NIDS_WARN_TCP_TOOMUCH || errnum == NIDS_WARN_TCP_BIGQUEUE) {
/* ALW - Should do something with it */
} else if (errnum != NIDS_WARN_TCP_HDR)
LOG("NIDSTCP:%s %s,from %s:%hu to %s:%hu", pcapFilename, nids_warnings[errnum],
saddr, ntohs(((struct tcphdr *) data)->source), daddr,
ntohs(((struct tcphdr *) data)->dest));
else
LOG("NIDSTCP:%s %s,from %s to %s", pcapFilename,
nids_warnings[errnum], saddr, daddr);
break;
default:
LOG("NIDS: Unknown warning number %d", type);
}
}
/******************************************************************************/
gboolean moloch_nids_watch_cb(gint UNUSED(fd), GIOCondition UNUSED(cond), gpointer UNUSED(data)) {
int r = nids_dispatch(config.packetsPerPoll);
if (r <= 0 && (pcapFile || pcapDir)) {
if (pcapDir && moloch_nids_next_file()) {
nids_init();
moloch_watch_fd(nids_getfd(), MOLOCH_GIO_READ_COND, moloch_nids_watch_cb, NULL);
nids_register_tcp(moloch_nids_cb_tcp);
nids_register_ip(moloch_nids_cb_ip);
return FALSE;
}
moloch_quit();
return FALSE;
}
return TRUE;
}
/******************************************************************************/
gboolean moloch_nids_poll_cb(gpointer UNUSED(uw)) {
nids_dispatch(config.packetsPerPoll);
return TRUE;
}
/******************************************************************************/
pcap_t *
moloch_pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf)
{
pcap_t *p;
int status;
p = pcap_create(source, errbuf);
if (p == NULL)
return (NULL);
status = pcap_set_snaplen(p, snaplen);
if (status < 0)
goto fail;
status = pcap_set_promisc(p, promisc);
if (status < 0)
goto fail;
status = pcap_set_timeout(p, to_ms);
if (status < 0)
goto fail;
status = pcap_set_buffer_size(p, config.pcapBufferSize);
if (status < 0)
goto fail;
status = pcap_activate(p);
if (status < 0)
goto fail;
status = pcap_setnonblock(p, TRUE, errbuf);
if (status < 0) {
pcap_close(p);
return (NULL);
}
return (p);
fail:
if (status == PCAP_ERROR)
snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
pcap_geterr(p));
else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
status == PCAP_ERROR_PERM_DENIED)
snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", source,
pcap_statustostr(status), pcap_geterr(p));
else
snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
pcap_statustostr(status));
pcap_close(p);
return (NULL);
}
/******************************************************************************/
uint32_t moloch_nids_dropped_packets()
{
struct pcap_stat ps;
pcap_stats(nids_params.pcap_desc, &ps);
return ps.ps_drop - initialDropped;
}
/******************************************************************************/
uint32_t moloch_nids_monitoring_sessions()
{
return HASH_COUNT(h_, sessions);
}
/******************************************************************************/
void moloch_nids_process_udp(MolochSession_t *session, struct udphdr *udphdr, unsigned char *data, int len)
{
if (session->port1 == 53 || session->port2 == 53)
moloch_detect_dns(session, data, len);
if (pluginsCbs & MOLOCH_PLUGIN_UDP)
moloch_plugins_cb_udp(session, udphdr, data, len);
}
/******************************************************************************/
GDir *pcapGDir = NULL;
int moloch_nids_next_file()
{
GError *error = 0;
char errbuf[1024];
if (!pcapGDir) {
pcapGDir = g_dir_open(pcapDir, 0, &error);
if (error) {
LOG("ERROR: Couldn't open pcap directory: Receive Error: %s", error->message);
exit(0);
}
}
if (nids_params.pcap_desc) {
pcap_close(nids_params.pcap_desc);
}
const gchar *filename;
while (1) {
filename = g_dir_read_name(pcapGDir);
if (!filename) {
return 0;
}
if (filename[0] == '.' || strcmp(".pcap", filename + strlen(filename)-5) != 0) {
continue;
}
gchar *fullfilename;
fullfilename = g_build_filename (pcapDir, filename, NULL);
LOG ("Processing %s", fullfilename);
nids_params.pcap_desc = pcap_open_offline(fullfilename, errbuf);
g_free(fullfilename);
return 1;
}
}
/******************************************************************************/
void moloch_nids_root_init()
{
char errbuf[1024];
if (pcapDir) {
moloch_nids_next_file();
}
else if (pcapFile) {
nids_params.pcap_desc = pcap_open_offline(pcapFile, errbuf);
} else {
#ifdef SNF
nids_params.pcap_desc = pcap_open_live(config.interface, 1600, 1, 500, errbuf);
#else
nids_params.pcap_desc = moloch_pcap_open_live(config.interface, 1600, 1, 500, errbuf);
#endif
}
if (!nids_params.pcap_desc) {
LOG("pcap open live failed! %s", errbuf);
exit(1);
}
}
/******************************************************************************/
void moloch_nids_init_nids()
{
nids_init();
if (nids_getfd() == -1) {
g_timeout_add(0, moloch_nids_poll_cb, NULL);
} else {
moloch_watch_fd(nids_getfd(), MOLOCH_GIO_READ_COND, moloch_nids_watch_cb, NULL);
}
static struct nids_chksum_ctl ctl;
ctl.netaddr = 0;
ctl.mask = 0;
ctl.action = NIDS_DONT_CHKSUM;
nids_register_chksum_ctl(&ctl, 1);
nids_register_tcp(moloch_nids_cb_tcp);
nids_register_ip(moloch_nids_cb_ip);
}
/******************************************************************************/
void moloch_nids_init()
{
LOG("%s", pcap_lib_version());
moloch_db_get_tag(NULL, MOLOCH_TAG_TAGS, "tcp", NULL);
moloch_db_get_tag(NULL, MOLOCH_TAG_TAGS, "udp", NULL);
moloch_db_get_tag(NULL, MOLOCH_TAG_TAGS, "protocol:http", NULL);
moloch_db_get_tag(NULL, MOLOCH_TAG_TAGS, "protocol:ssh", NULL);
moloch_db_get_tag(NULL, MOLOCH_TAG_TAGS, "protocol:smtp", NULL);