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sip_bf_detector.cpp
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/**
* \file sip_bf_detector.cpp
* \brief Module for detecting brute-force attacks on Session Initiation Protocol.
* \author Tomas Jansky <[email protected]>
* \date 2016
*/
/*
* Copyright (C) 2016 CESNET
*
* LICENSE TERMS
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* ALTERNATIVELY, provided that this notice is retained in full, this
* product may be distributed under the terms of the GNU General Public
* License (GPL) version 2 or later, in which case the provisions
* of the GPL apply INSTEAD OF those given above.
*
* This software is provided ``as is'', and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed.
* In no event shall the company or contributors be liable for any
* direct, indirect, incidental, special, exemplary, or consequential
* damages (including, but not limited to, procurement of substitute
* goods or services; loss of use, data, or profits; or business
* interruption) however caused and on any theory of liability, whether
* in contract, strict liability, or tort (including negligence or
* otherwise) arising in any way out of the use of this software, even
* if advised of the possibility of such damage.
*
*/
#include "sip_bf_detector.h"
#include "fields.h"
#include <getopt.h>
#include <signal.h>
#include <sstream>
#include <cmath>
#include <ctime>
UR_FIELDS (
ipaddr DST_IP, // IP address of attack source
ipaddr SRC_IP, // IP address of attack target
uint16 DST_PORT,
uint16 SRC_PORT,
uint64 LINK_BIT_FIELD, // number of link
uint8 PROTOCOL, // TCP or UDP protocol
time TIME_FIRST, // time of the message
uint16 SIP_MSG_TYPE, // type of SIP message
uint16 SIP_STATUS_CODE, // status code of SIP response
string SIP_CSEQ, // CSEQ field in SIP message
string SIP_CALLING_PARTY, // targeted user name
ipaddr SBFD_TARGET,
ipaddr SBFD_SOURCE,
uint64 SBFD_LINK_BIT_FIELD,
uint8 SBFD_PROTOCOL,
time SBFD_EVENT_TIME,
time SBFD_CEASE_TIME,
time SBFD_BREACH_TIME,,
uint8 SBFD_EVENT_TYPE,
uint64 SBFD_EVENT_ID,
uint32 SBFD_ATTEMPTS,
uint32 SBFD_AVG_ATTEMPTS,
string SBFD_USER
)
trap_module_info_t *module_info = NULL;
#define MODULE_BASIC_INFO(BASIC) \
BASIC("sip_bf_detector","Module for detecting brute-force attacks on Session Initiation Protocol.",1,1)
#define MODULE_PARAMS(PARAM) \
PARAM('a', "alert_threshold", "Number of unsuccessful authentication attempts for considering this behaviour as an attack. (50 by default)", required_argument, "uint64") \
PARAM('c', "check_mem_int", "Number of seconds between the checks on ceased attacks. (300 by default)", required_argument, "uint64") \
PARAM('d', "dist_threshold", "Number of clients attempting to connect to a specific user (on one particular server) which is considered a distributed brute-force attack. (25 by default)", required_argument, "uint32") \
PARAM('f', "free_mem_delay", "Number of seconds after the last action to consider attack as ceased. (1800 by default)", required_argument, "uint64") \
PARAM('o', "ok_count", "Number of observed OK responses after crossing alert threshold to consider the alert false and drop the communication. (5 by default)", required_argument, "uint32") \
PARAM('s', "scan_threshold", "Number of extensions a specific client attempted to register as (on one particular server) which is considered a scan. (5 by default)", required_argument, "uint32")
#define ASSIGN_MIN(A, B) (A) = ((A) <= (B)) ? (A) : (B)
#define ASSIGN_MAX(A, B) (A) = ((A) >= (B)) ? (A) : (B)
static int stop = 0;
int verbose;
uint64_t g_alert_threshold = DEFAULT_ALERT_THRESHOLD;
uint64_t g_check_mem_interval = CHECK_MEMORY_INTERVAL;
uint64_t g_free_mem_interval = FREE_MEMORY_INTERVAL;
uint32_t g_scan_limit = DEFAULT_SCAN_LIMIT;
uint32_t g_dbf_limit = DEFAULT_DBF_LIMIT;
uint32_t g_ok_limit = DEFAULT_OK_COUNT_LIMIT;
uint16_t g_min_sec = 0;
uint16_t g_event_row = 0;
ur_template_t *alert_tmplt = NULL;
//ur_template_t *tm_tmplt = NULL;
void *alert_rec = NULL;
//void *tm_rec = NULL;
int sig_counter = 0;
/* *********************** */
void signal_handler(int signal)
{
stop = 1;
sig_counter++;
if (sig_counter > 1) {
trap_terminate();
}
}
/**
* Comparing function used in b+ tree of users.
* Compares two strings representing keys in b+ tree.
*
* \param[in] a pointer to the first key
* \param[in] b pointer to the second key
* \return <0 (a < b), 0 (a == b), >0 (a > b)
*/
int compare_user_name(void *a, void *b)
{
return strncmp((const char *) a, (const char *) b, MAX_LENGTH_USER_NAME);
}
/**
* Comparing function used in b+ tree of servers and attackers.
* Compares two integer representations of IPv4 keys.
*
* \param[in] a pointer to the first key
* \param[in] b pointer to the second key
* \return <0 (a < b), 0 (a == b), >0 (a > b)
*/
int compare_ipv4(void *a, void *b)
{
uint32_t *h1, *h2;
h1 = (uint32_t *) a;
h2 = (uint32_t *) b;
if (*h1 == *h2) {
return EQUAL;
}
else if (*h1 < *h2) {
return LESS;
}
return MORE;
}
/**
* Comparing function used in b+ tree of servers and attackers.
* Compares two IPv6 keys.
*
* \param[in] a pointer to the first key
* \param[in] b pointer to the second key
* \return <0 (a < b), 0 (a == b), >0 (a > b)
*/
int compare_ipv6(void *a, void *b)
{
int ret;
ret = memcmp(a, b, IP_VERSION_6_BYTES);
if (ret == 0) {
return EQUAL;
} else if (ret < 0) {
return LESS;
}
return MORE;
}
dbf_t::dbf_t(const data_t *flow)
{
m_breacher = NULL;
m_time_breach = 0;
m_time_last = flow->time_stamp;
m_other_attempts = 0;
m_ok_count = 0;
m_destroy = false;
}
dbf_t::~dbf_t()
{
free(m_breacher);
}
bool dbf_t::addBreacher(const ip_addr_t *breacher)
{
m_breacher = (ip_addr_t *) malloc(sizeof(ip_addr_t));
if (!m_breacher) {
fprintf(stderr, "ERROR: dbf_t::addBreach - malloc failed.\n");
return false;
}
memcpy(m_breacher, breacher, sizeof(ip_addr_t));
return true;
}
bf_t::bf_t(const data_t *flow, Client *clt, User *usr)
{
m_source = clt;
m_target = usr;
m_attempts = 1;
m_time_first = flow->time_stamp;
m_time_last = flow->time_stamp;
m_time_breach = 0;
m_ok_count = 0;
m_protocol = flow->protocol;
m_link_bit_field = flow->link_bit_field;
}
bool bf_t::isReportable() const
{
if (m_attempts >= g_alert_threshold && m_source->getScan() == NULL && m_ok_count <= g_ok_limit) {
return true;
}
return false;
}
scan_t::scan_t(const data_t *flow)
{
m_other_attempts = 0;
m_time_last = flow->time_stamp;
m_destroy = false;
m_ok_count = 0;
}
bool User::init(char *name)
{
size_t length = strlen(name);
m_name = NULL;
m_dbf = NULL;
m_index = 0;
m_size = DEFAULT_DBF_START_SIZE;
m_name = (char *) malloc((length + 1) * sizeof(char));
m_com = (bf_t **) malloc(m_size * sizeof(bf_t *));
if (!m_name || !m_com) {
fprintf(stderr, "ERROR: User::init - malloc failed.\n");
if (m_name) {
free(m_name);
}
if (m_com) {
free(m_com);
}
return false;
}
strncpy(m_name, name, length);
m_name[length] = '\0';
return true;
}
int User::addCom(const data_t *flow, Client *clt, bf_t *bf)
{
if (bf) {
ASSIGN_MAX(bf->m_time_last, flow->time_stamp);
bf->m_attempts++;
if (bf->m_attempts == g_alert_threshold) {
return 1;
}
return 0;
}
m_com[m_index] = new bf_t(flow, clt, this);
if (!m_com[m_index]) {
fprintf(stderr, "ERROR: User::addCom - new failed when creating BF structure.\n");
return -1;
}
clt->addCom(flow, m_com[m_index]);
m_index++;
if (m_index == g_dbf_limit) {
m_dbf = new dbf_t(flow);
if (!m_dbf) {
fprintf(stderr, "ERROR: User::addCom - new failed when creating DBF structure.\n");
return -1;
}
return 0;
}
if (m_index == m_size) {
if (!extendCom()) {
return -1;
}
}
return 0;
}
bf_t* User::findCom(const Client* clt) const
{
for (uint32_t i = 0; i < m_index; i++) {
if (clt == m_com[i]->m_source) {
return m_com[i];
}
}
return NULL;
}
dbf_t* User::getDBF() const
{
return m_dbf;
}
int User::evaluateFlows(uint32_t current_time, Server *srv)
{
if (m_dbf && !m_dbf->m_destroy && (current_time > m_dbf->m_time_last) && ((current_time - m_dbf->m_time_last) > g_free_mem_interval)) {
srv->reportAlert(NULL, this, NULL, DBF);
m_dbf->m_destroy = true;
}
if (m_dbf && m_dbf->m_destroy) {
int j = 0;
for (uint32_t i = 0; i < m_index; i++) {
bf_t *bf = m_com[i];
scan_t *scan = bf->m_source->getScan();
if (!(scan && !scan->m_destroy)) {
bf->m_source->removeCom(bf);
removeCom(bf);
delete bf;
j++;
i--;
}
}
if (j != 0) {
delete m_dbf;
m_dbf = NULL;
}
if (m_index == 0) {
free(m_com);
free(m_name);
return 1;
}
return 0;
}
if (!m_dbf) {
for (uint32_t i = 0; i < m_index; i++) {
bf_t *bf = m_com[i];
scan_t *scan = bf->m_source->getScan();
if (scan) {
if (scan->m_destroy) {
bf->m_source->removeCom(bf);
removeCom(bf);
delete bf;
i--;
}
} else if (bf->m_ok_count > g_ok_limit) {
bf->m_source->removeCom(bf);
removeCom(bf);
delete bf;
i--;
} else if ((current_time > bf->m_time_last) && ((current_time - bf->m_time_last) > g_free_mem_interval)) {
if (bf->m_attempts >= g_alert_threshold) {
srv->reportAlert(bf, NULL, NULL, BF);
}
bf->m_source->removeCom(bf);
removeCom(bf);
delete bf;
i--;
}
}
}
if (m_index == 0) {
delete m_dbf;
free(m_com);
free(m_name);
return 1;
}
return 0;
}
bool User::extendCom()
{
bf_t **tmp = NULL;
m_size *= 2;
if (m_size > g_dbf_limit) {
m_size = g_dbf_limit;
}
tmp = (bf_t **) realloc(m_com, m_size * sizeof(bf_t *));
if (!tmp) {
fprintf(stderr, "ERROR: User::extendCom - realloc failed.\n");
return false;
}
m_com = tmp;
return true;
}
void User::destroy(Server *srv)
{
if (m_dbf) {
if (!m_dbf->m_destroy) {
srv->reportAlert(NULL, this, NULL, DBF);
}
for (uint32_t i = 0; i < m_index; i++) {
m_com[i]->m_source->removeCom(m_com[i]);
delete m_com[i];
}
} else {
for (uint32_t i = 0; i < m_index; i++) {
bf_t *bf = m_com[i];
if (bf->isReportable()) {
srv->reportAlert(bf, NULL, NULL, BF);
}
bf->m_source->removeCom(bf);
delete bf;
}
}
delete m_dbf;
free(m_com);
free(m_name);
}
void User::removeCom(bf_t *bf) {
for (uint32_t i = 0; i < m_index; i++) {
if (m_com[i] == bf) {
if (i + 1 == m_index) {
m_com[i] = NULL;
} else {
m_com[i] = m_com[m_index - 1];
m_com[m_index - 1] = NULL;
}
m_index--;
return;
}
}
}
void User::getDBFStats(stats_t *stats) const
{
for (uint32_t i = 0; i < m_index; i++) {
bf_t *bf = m_com[i];
if (i == 0) {
stats->m_protocol = bf->m_protocol;
stats->m_link_bit_field = bf->m_link_bit_field;
stats->m_time_first = bf->m_time_first;
stats->m_total_count = bf->m_attempts;
stats->m_clt = bf->m_source;
} else {
ASSIGN_MIN(stats->m_time_first, bf->m_time_first);
stats->m_total_count += bf->m_attempts;
}
}
stats->m_avg_count = stats->m_total_count / m_index;
stats->m_total_count += m_dbf->m_other_attempts;
}
bool Client::init(ip_addr_t *ip, uint16_t port)
{
m_ip = NULL;
m_scan = NULL;
m_index = 0;
m_port = port;
m_size = DEFAULT_SCAN_START_SIZE;
m_com = (bf_t **) malloc(m_size * sizeof(bf_t *));
m_ip = (ip_addr_t *) malloc(sizeof(ip_addr_t));
if (!m_com || !m_ip) {
fprintf(stderr, "ERROR: Client::init - malloc failed.\n");
if (m_com) {
free(m_com);
}
if (m_ip) {
free(m_ip);
}
return false;
}
memcpy(m_ip, ip, sizeof(ip_addr_t));
return true;
}
scan_t* Client::getScan() const
{
return m_scan;
}
bool Client::addCom(const data_t *flow, bf_t *bf)
{
m_com[m_index] = bf;
m_index++;
if (m_index == g_scan_limit) {
m_scan = new scan_t(flow);
if (!m_scan) {
fprintf(stderr, "ERROR: Client::addCom - new failed.\n");
return false;
}
return true;
}
if (m_index == m_size) {
if (!extendCom()) {
return false;
}
}
return true;
}
int Client::getSize() const
{
return m_index;
}
void Client::removeCom(bf_t *bf)
{
for (uint32_t i = 0; i < m_index; i++) {
if (m_com[i] == bf) {
if (i + 1 == m_index) {
m_com[i] = NULL;
} else {
m_com[i] = m_com[m_index - 1];
m_com[m_index - 1] = NULL;
}
m_index--;
return;
}
}
}
bool Client::extendCom()
{
bf_t **tmp = NULL;
m_size *= 2;
if (m_size > g_scan_limit) {
m_size = g_scan_limit;
}
tmp = (bf_t **) realloc(m_com, m_size * sizeof(bf_t *));
if (!tmp) {
fprintf(stderr, "ERROR: Client::extendCom - realloc failed.\n");
return false;
}
m_com = tmp;
return true;
}
void Client::destroy()
{
free(m_ip);
delete m_scan;
free(m_com);
}
void Client::getScanStats(stats_t *stats) const
{
for (uint32_t i = 0; i < m_index; i++) {
bf_t *bf = m_com[i];
if (i == 0) {
stats->m_protocol = bf->m_protocol;
stats->m_link_bit_field = bf->m_link_bit_field;
stats->m_time_first = bf->m_time_first;
stats->m_total_count = bf->m_attempts;
} else {
ASSIGN_MIN(stats->m_time_first, bf->m_time_first);
stats->m_total_count += bf->m_attempts;
}
}
stats->m_avg_count = stats->m_total_count / m_index;
stats->m_total_count += m_scan->m_other_attempts;
}
bool Server::init(const data_t *flow)
{
int (*comp_func)(void *, void *);
uint8_t ip_bytes;
size_t length;
m_users = m_clients = NULL;
m_name_suffix = NULL;
m_ip = NULL;
m_port = flow->server_port;
length = strlen(flow->name_suffix);
m_ipv4 = flow->ipv4;
m_name_suffix = (char *) malloc(length + 1);
m_ip = (ip_addr_t *) malloc(sizeof(ip_addr_t));
if (!m_name_suffix || !m_ip) {
fprintf(stderr, "ERROR: Server::init - malloc failed.\n");
goto cleanup;
}
strncpy(m_name_suffix, flow->name_suffix, length);
m_name_suffix[length] = '\0';
memcpy(m_ip, flow->ip_src, sizeof(ip_addr_t));
if (m_ipv4) {
comp_func = &compare_ipv4;
ip_bytes = IP_VERSION_4_BYTES;
} else {
comp_func = &compare_ipv6;
ip_bytes = IP_VERSION_6_BYTES;
}
m_users = bpt_init(5, &compare_user_name, sizeof(User), MAX_LENGTH_USER_NAME);
m_clients = bpt_init(5, comp_func, sizeof(Client), ip_bytes);
if (!m_users || !m_clients) {
fprintf(stderr, "ERROR: Server::init - bpt_init returned NULL.\n");
goto cleanup;
}
return true;
cleanup:
if (m_name_suffix) {
free(m_name_suffix);
m_name_suffix = NULL;
}
if (m_ip) {
free(m_ip);
m_ip = NULL;
}
if (m_users) {
bpt_clean(m_users);
m_users = NULL;
}
if (m_clients) {
bpt_clean(m_clients);
m_clients = NULL;
}
return false;
}
uint64_t Server::createId(uint32_t time_first)
{
uint64_t event_id = 0;
char ptr[32];
const time_t time = time_first;
uint16_t min_sec = 0;
struct tm tmp_tm;
strftime(ptr, 31, "%F %T", gmtime_r(&time, &tmp_tm));
ptr[4] = ptr[7] = ptr[10] = ptr[13] = ptr[16] = ptr[19] = '\0';
event_id = (uint64_t) atoi(ptr);
event_id *= 100;
event_id += (uint64_t) atoi(ptr + 5);
event_id *= 100;
event_id += (uint64_t) atoi(ptr + 8);
event_id *= 100;
event_id += (uint64_t) atoi(ptr + 11);
event_id *= 100;
event_id += (uint64_t) atoi(ptr + 14);
event_id *= 100;
min_sec = ((uint16_t) (atoi(ptr + 14) * 100));
event_id += (uint64_t) atoi(ptr + 17);
event_id *= 10000;
min_sec += (uint16_t) atoi(ptr + 17);
if (min_sec == g_min_sec) {
g_event_row++;
event_id += g_event_row;
} else {
g_event_row = 0;
g_min_sec = min_sec;
}
return event_id;
}
/*void Server::alertTimeMachine(const ip_addr_t *source)
{
ur_set(tm_tmplt, tm_rec, F_SRC_IP, *source);
int ret = trap_send(1, tm_rec, ur_rec_size(tm_tmplt, tm_rec));
if (ret != TRAP_E_OK) {
fprintf(stderr, "ERROR: Server::alertTimeMachine - trap_send returned error value.\n");
}
}*/
void Server::reportAlert(bf_t *bf, User *usr, Client *clt, event_type_t event)
{
ostringstream ss;
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_TYPE, event);
ur_set(alert_tmplt, alert_rec, F_SBFD_TARGET, *m_ip);
ur_set(alert_tmplt, alert_rec, F_DST_PORT, m_port);
if (event == BF) {
if (!bf) {
fprintf(stderr, "ERROR: Server::reportAlert - method received NULL pointer when reporting BF.\n");
return;
}
if (bf->m_time_last < bf->m_time_first) {
fprintf(stderr, "WARNING: CASE BF: Cease time: %" PRIu32 " lesser than Event time: %" PRIu32 ".\n", bf->m_time_last, bf->m_time_first);
}
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_ID, createId(bf->m_time_first));
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_TIME, ur_time_from_sec_msec(bf->m_time_first, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_BREACH_TIME, ur_time_from_sec_msec(bf->m_time_breach, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_CEASE_TIME, ur_time_from_sec_msec(bf->m_time_last, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_ATTEMPTS, bf->m_attempts);
ur_set(alert_tmplt, alert_rec, F_SBFD_AVG_ATTEMPTS, bf->m_attempts);
ur_set(alert_tmplt, alert_rec, F_SBFD_SOURCE, *(bf->m_source->m_ip));
ur_set(alert_tmplt, alert_rec, F_SBFD_PROTOCOL, bf->m_protocol);
ur_set(alert_tmplt, alert_rec, F_SBFD_LINK_BIT_FIELD, bf->m_link_bit_field);
ur_set(alert_tmplt, alert_rec, F_SRC_PORT, bf->m_source->m_port);
ss << bf->m_target->m_name << '@' << m_name_suffix;
ur_set_var(alert_tmplt, alert_rec, F_SBFD_USER, ss.str().c_str(), ss.str().length());
} else if (event == DBF) {
if (!usr) {
fprintf(stderr, "ERROR: Server::reportAlert - method received NULL pointer when reporting DBF.\n");
return;
}
stats_t *stats = new stats_t();
if (!stats) {
fprintf(stderr, "ERROR: Server::reportAlert - new failed when reporting DBF.\n");
return;
}
usr->getDBFStats(stats);
dbf_t *dbf = usr->getDBF();
if (!dbf->m_breacher) {
ur_set(alert_tmplt, alert_rec, F_SBFD_SOURCE, *(stats->m_clt->m_ip));
ur_set(alert_tmplt, alert_rec, F_SBFD_BREACH_TIME, 0);
} else {
ur_set(alert_tmplt, alert_rec, F_SBFD_SOURCE, *(dbf->m_breacher));
ur_set(alert_tmplt, alert_rec, F_SBFD_BREACH_TIME, ur_time_from_sec_msec(dbf->m_time_breach, 0));
}
if (dbf->m_time_last < stats->m_time_first) {
fprintf(stderr, "WARNING: CASE DBF: Cease time: %" PRIu32 " lesser than Event time: %" PRIu32 ".\n", dbf->m_time_last, stats->m_time_first);
}
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_ID, createId(stats->m_time_first));
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_TIME, ur_time_from_sec_msec(stats->m_time_first, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_CEASE_TIME, ur_time_from_sec_msec(dbf->m_time_last, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_ATTEMPTS, stats->m_total_count);
ur_set(alert_tmplt, alert_rec, F_SBFD_AVG_ATTEMPTS, stats->m_avg_count);
ur_set(alert_tmplt, alert_rec, F_SRC_PORT, 0);
ur_set(alert_tmplt, alert_rec, F_SBFD_PROTOCOL, stats->m_protocol);
ur_set(alert_tmplt, alert_rec, F_SBFD_LINK_BIT_FIELD, stats->m_link_bit_field);
ss << usr->m_name << '@' << m_name_suffix;
ur_set_var(alert_tmplt, alert_rec, F_SBFD_USER, ss.str().c_str(), ss.str().length());
delete stats;
} else if (event == SCAN) {
if (!clt) {
fprintf(stderr, "ERROR: Server::reportAlert - method received NULL pointer when reporting SCAN.\n");
return;
}
stats_t *stats = new stats_t();
if (!stats) {
fprintf(stderr, "ERROR: Server::reportAlert - new failed when reporting SCAN.\n");
return;
}
clt->getScanStats(stats);
scan_t *scan = clt->getScan();
if (scan->m_time_last < stats->m_time_first) {
fprintf(stderr, "WARNING: CASE SCAN: Cease time: %" PRIu32 " lesser than Event time: %" PRIu32 ".\n", scan->m_time_last, stats->m_time_first);
}
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_ID, createId(stats->m_time_first));
ur_set(alert_tmplt, alert_rec, F_SBFD_EVENT_TIME, ur_time_from_sec_msec(stats->m_time_first, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_BREACH_TIME, 0);
ur_set(alert_tmplt, alert_rec, F_SBFD_CEASE_TIME, ur_time_from_sec_msec(scan->m_time_last, 0));
ur_set(alert_tmplt, alert_rec, F_SBFD_ATTEMPTS, stats->m_total_count);
ur_set(alert_tmplt, alert_rec, F_SBFD_AVG_ATTEMPTS, stats->m_avg_count);
ur_set(alert_tmplt, alert_rec, F_SBFD_SOURCE, *(clt->m_ip));
ur_set(alert_tmplt, alert_rec, F_SRC_PORT, clt->m_port);
ur_set(alert_tmplt, alert_rec, F_SBFD_PROTOCOL, stats->m_protocol);
ur_set(alert_tmplt, alert_rec, F_SBFD_LINK_BIT_FIELD, stats->m_link_bit_field);
ur_set_var(alert_tmplt, alert_rec, F_SBFD_USER, "", 0);
delete stats;
} else {
return;
}
int ret = trap_send(0, alert_rec, ur_rec_size(alert_tmplt, alert_rec));
if (ret != TRAP_E_OK) {
fprintf(stderr, "ERROR: Server::reportAlert - trap_send returned error value.\n");
}
}
bool Server::insertSourceAndTarget(const data_t *flow, User *usr, Client *clt)
{
bf_t *bf = usr->findCom(clt);
if (flow->status_code == SIP_STATUS_OK) {
if (!bf) {
return true;
}
if (bf->m_time_breach != 0) {
bf->m_ok_count++;
ASSIGN_MAX(bf->m_time_last, flow->time_stamp);
if (bf->m_ok_count > g_ok_limit) {
usr->removeCom(bf);
clt->removeCom(bf);
delete bf;
}
} else if (bf->m_attempts >= g_alert_threshold) {
bf->m_attempts++;
bf->m_time_breach = flow->time_stamp;
ASSIGN_MAX(bf->m_time_last, flow->time_stamp);
bf->m_ok_count++;
/* alertTimeMachine(flow->ip_dst); */
} else {
usr->removeCom(bf);
clt->removeCom(bf);
delete bf;
}
return true;
}
int ret = usr->addCom(flow, clt, bf);
switch (ret) {
case 1:
case 0:
break;
case -1:
return false;
}
return true;
}
bool Server::insertFlow(const data_t *flow)
{
int dst_ip = ip_get_v4_as_int(flow->ip_dst);
void *tree_key = flow->ipv4 ? (void *) (&dst_ip) : (void *) flow->ip_dst;
User *usr = (User *) bpt_search(m_users, flow->user);
Client *clt = (Client *) bpt_search(m_clients, tree_key);
if (usr && clt) {
if (clt->getScan()) {
updateScan(flow, clt, usr);
}
if(usr->getDBF()) {
updateDBF(flow, clt, usr);
}
if(!clt->getScan() && !usr->getDBF()) {
insertSourceAndTarget(flow, usr, clt);
}
} else if (!usr && clt) {
if (clt->getScan()) {
updateScan(flow, clt, usr);
} else {
usr = createUserNode(flow->user);
if (!usr) {
return false;
}
insertSourceAndTarget(flow, usr, clt);
}
} else if (usr && !clt) {
if(usr->getDBF()) {
updateDBF(flow, clt, usr);
} else {
clt = createClientNode(tree_key, flow->ip_dst, flow->client_port);
if (!clt) {
return false;
}
insertSourceAndTarget(flow, usr, clt);
}
} else {
clt = createClientNode(tree_key, flow->ip_dst, flow->client_port);
if (!clt) {
return false;
}
usr = createUserNode(flow->user);
if (!usr) {
clt->destroy();
bpt_item_del(m_clients, tree_key);
return false;
}
insertSourceAndTarget(flow, usr, clt);
}
return true;
}
void Server::updateDBF(const data_t *flow, Client *clt, User *usr)
{
dbf_t *dbf = usr->getDBF();
if (dbf->m_destroy) {
return;
}
if (flow->status_code == SIP_STATUS_OK) {
dbf->m_time_breach = flow->time_stamp;
dbf->m_ok_count++;
if (!dbf->m_breacher) {
dbf->addBreacher(flow->ip_dst);
/* alertTimeMachine(flow->ip_dst); */
} else if(dbf->m_ok_count > g_ok_limit) {
dbf->m_destroy = true;
}
}
if (!clt) {
dbf->m_other_attempts++;
} else {
bf_t *bf = usr->findCom(clt);
if (bf) {
ASSIGN_MAX(bf->m_time_last, flow->time_stamp);
bf->m_attempts++;
} else {
dbf->m_other_attempts++;
}
}
ASSIGN_MAX(dbf->m_time_last, flow->time_stamp);
}
void Server::updateScan(const data_t *flow, Client *clt, User *usr)
{
scan_t *scan = clt->getScan();
if (scan->m_destroy) {
return;
}
if (flow->status_code == SIP_STATUS_OK) {
scan->m_ok_count++;
if (scan->m_ok_count > g_ok_limit) {
scan->m_destroy = true;
}
}
if (!usr) {
scan->m_other_attempts++;
} else {
bf_t *bf = usr->findCom(clt);
if (bf) {
if (flow->status_code == SIP_STATUS_OK && bf->m_time_breach == 0) {
bf->m_time_breach = flow->time_stamp;
}
ASSIGN_MAX(bf->m_time_last, flow->time_stamp);
bf->m_attempts++;
} else {
scan->m_other_attempts++;
}
}
ASSIGN_MAX(scan->m_time_last, flow->time_stamp);
}
Client* Server::createClientNode(void *tree_key, ip_addr_t *ip, uint16_t port)
{
Client *clt = (Client *) bpt_insert(m_clients, tree_key);
if (clt) {
if (!clt->init(ip, port)) {
bpt_item_del(m_clients, tree_key);
clt = NULL;
}
} else {
fprintf(stderr, "ERROR: Server::createClientNode - bpt_insert returned NULL.\n");
}
return clt;