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updateHost.bro
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updateHost.bro
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# author: wangyixuan
# It aims at getting hosts'
# USERNAME, 0 pay attention to NTLM PLZ
# HOSTNAME, 1
# MAC ADDRESS, 1
# OPERATING SYSTEM, 1
# IP ADDRESS 1
# How to sort ips?
# Type (indicates devicetype, etc desktop, laptop, tablet)
# Applications (Why do we need it? Should we guess during which period such applications are running?)
# Protocols (so many protocols, how to handle them? It exists between two hosts.)
# Maintain the information of hosts all the time and output it to log file regularly
# completed two functions named update_hostlist and update_single_host
# event new_connection: collect various protocols which are indicated by connections
# event protocol_confirmation: this event is emitted when bro confirms that this protocol is actually running here
# problem to solve: whether the protocols comes is a new protocol? Using !in is not appropriate.
# adjust the format of protocols etc: http:33,dns:14
# data to log cannot be a table
# how to invoke a event in a specific interval
# refer to test1.bro and define an event by ourself
# this user-defined event can complish the task of logging hostlist every n seconds
# outside dataprocesser can read the log every n seconds as well
# convert ts to the form of "YYYY:MM:DD-HH:MM:SS", which is easier to understand
# in "ips": mark the timestamp of each ip
# in "protocols": mark the number that indicate how many time this protocol has beem confirmed
# the value of n is dynamic
# there are some problems in updating ips
# 1. segment fault
# 2. redundant ip in "ips" field
# 3, three records missing ips(uninitialized)
# 4. the way to check a ip already exist? etc: 192.168.1.5, 192.168.1.50 substring is not reliable
# @load /home/lw/myKGA/signature_test.bro
module HOST_INFO;
@load /usr/local/zeek/share/zeek/base/frameworks/dpd/__load__.bro
export{
# Create an ID for our new stream. By convention, this is
# called "HOST_INFO_LOG".
redef enum Log::ID += { HOST_INFO_LOG,
SUMMARY_HOST_LOG,
NET_EVENTS_LOG };# NET_EVENTS_LOG记录重要网络事件(或者网络包),作为KG分析的输入,BRO脚本分析多步攻击的数据集
# 定义三元组中谓语的类型,输出的格式是HOST_INFO::ICMP_ECHO_REQUEST
type relation: enum {
Empty, ICMP_ECHO_REQUEST, ICMP_ECHO_REPLY, ICMP_UNREACHABLE
};
# unfortunately, its json format is incorrect
# We need to handle the json format output line by line
# redef LogAscii::use_json = T;
# Define the record type that will contain the data to log.
type host_info: record{
ts: time &log;
ip: addr &log;#indicates the newest ip
ips: string &default="" &log; # historical ips, ordered by their
username: string &default="" &log;
hostname: string &default="" &log;
mac: string &default="" &log;
os: string &default="" &log;
description: string &default="" &log;
protocols: string &default="" &log; # list all of its protocols
};
# 再定义一个结构体,用于存储三元组事件(A, relation, B),实际就是(主,谓,宾)三元组
# 三元组事件的存储方案: 1.三元组表 2.水平表 3.属性表 4.垂直划分 5.六重索引 6.DB2RDF
# 还是存储到RDF中,后续可以进行SPARQL查询?
# 数据量巨大,考虑三元组的聚合(去除一些没用的三元组)=>类比南理工的文章中的经验聚合(去除一些不太重要的告警信息)
# 三元组的内容不局限于最底层流量,应当有一些告警层面的三元组(但是这种三元组从哪儿来?有现成的事件还是推理出来)
# 更新: 用边来表示事件,为了兼容各种情况,可以包含诸多属性
# 属性可以慢慢添加,逐渐完善
# 目前考虑的事件: 1. icmp ping事件
type event_info: record{
ts: time &log;
real_time: string &log;
event_type: relation &log;
src_ip: addr &log;
src_p: port &log;
dst_ip: addr &log;
dst_p: port &log;
};
}
# Use it to store host-info
global hostlist: vector of host_info = {};
global num_packets = 0;
# Precondition: 0 <= index <= |hostlist|
# Postcondition: cooresponding item has been updated
function update_single_host(hinfo: HOST_INFO::host_info, protocol: string, index: int){
# remember to initialize "ips" and "protocols"
# print fmt("update index %d", index);
# print hinfo;
print fmt("index is : %d", index);
local tmp_ip: string = fmt("%s", hinfo$ip);
local up_index: count = 0;
print fmt("the ip is %s", tmp_ip);
if(hostlist[index]$ips == ""){
# print fmt("initialize ips of index %d", index);
local t: time = network_time();
hostlist[index]$ips = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", t) + tmp_ip);
}
if(hostlist[index]$protocols == ""){
# print fmt("initialize protocols of index %d", index);
hostlist[index]$protocols = protocol + ":1";
}
# check that whether ip is the newest ip
if(hinfo$ip != hostlist[index]$ip){
# print fmt("update ips because host's ip has been changed");
# Maybe this host uses a new ip now, so I need to concatenate "ips"
# Since these messages comes in order, I take it for granted that it is unnecessary to compare timestamp.
hostlist[index]$ip = hinfo$ip; # update the newest ip
# maybe we need a new way to determine whether the ip is new: edit the if condition
if(tmp_ip !in hostlist[index]$ips){
# a new ip comes, append it to the end of ips
local t1: time = network_time();
hostlist[index]$ips += fmt(",%s", strftime("%Y-%m-%d-%H:%M:%S|", t1) + tmp_ip);
print "append ips";
} else {
print "update ips";
# in this case, the previous ts should be updated
local comma: pattern = /,/;
local tmp_tlb: table[count] of string = split(hostlist[index]$ips, comma);
local ori_len: count = |tmp_tlb|;
# tmp_tlb_ip holds the ips in tmp_tlb and has the same index as tmp_tlb
# To ensure the coming ip is a new ip or not clearly.
local tmp_tlb_ip: table[count] of string;
for(key in tmp_tlb){
local bin_tlb: table[count] of string = split(tmp_tlb[key], /\|/);
tmp_tlb_ip[key] = bin_tlb[2];
}
print fmt("previous len: %d", ori_len);
print "what is in ips now ?";
print hostlist[index]$ips;
print "what is in tmp_tlb now?";
print tmp_tlb;
for(key in tmp_tlb_ip){# use tmp_tlb_ip to determine the key to store
print key; # To avoid missing ips, we should initialize "ips" when we append a new item
print tmp_tlb_ip[key];
print "start checking";
if(tmp_ip == tmp_tlb_ip[key]){
# this item should be updated
print "bingo";
# here is strange segment fault when I try to directly overwrite tmp_tlb[key] here
# so I record the value of key instead
up_index = key;
# tmp_tlb[key] = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", t2) + tmp_ip);
# print fmt("the last item: %s", tmp_tlb[key]);
# if(key == ori_len){ # the last item
# tmp_tlb[key] = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", t2) + tmp_ip);
# print fmt("the last item: %s", tmp_tlb[key]);
# }
# else{ # previous items
# tmp_tlb[key] = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", t2) + tmp_ip);
# print fmt("previous item: %s", tmp_tlb[key]);
# }
}
print "end checking";
}
print "before join!";
if(up_index != 0){
# up_index is applied to update tmp_tlb
# from now on, tmp_tlb_ip is useless
local t2: time = network_time();
tmp_tlb[up_index] = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", t2) + tmp_ip);
}
for(key in tmp_tlb){
print fmt("[%d]=>%s", key, tmp_tlb[key]);
}
# hostlist[index]$ips = cat_string_array(tmp_tlb); # overwrite
hostlist[index]$ips = join_string_array(",", tmp_tlb);
print fmt("after join:%s", hostlist[index]$ips);
# recheck the number of commas in ips
if(ori_len != |split(hostlist[index]$ips, comma)|){
print "Unexpected error: the number of commas is wrong";
print fmt("ori_len: %d, new len: %d", ori_len, |split(hostlist[index]$ips, comma)|);
}
}
} else {
print "do not update ips";
}
# check that whether protocol is a protocol related to this host
# if not: concatenate "protocols" separated by commas
# this check condition is not so good
# we'd better split protocols into individual items and compare them
up_index = 0; # reinitialize up_index
if(protocol != "" && protocol !in hostlist[index]$protocols){
# print fmt("update protocols because a new protocol of this host found");
hostlist[index]$protocols += fmt(",%s:1", protocol);
} else {
# record the count
local pro_tlb: table[count] of string = split(hostlist[index]$protocols, /,/);
local pro_tlb_tmp: table[count] of string;
print "start updating protocols";
print pro_tlb;
for(key in pro_tlb){
local bin_p_tlb: table[count] of string = split(pro_tlb[key], /:/);
pro_tlb_tmp[key] = bin_p_tlb[1];
}
for(key in pro_tlb_tmp){
if(protocol == pro_tlb_tmp[key]){
# increase by one later
up_index = key;
}
if(up_index != 0){
local bin_p_tlb1: table[count] of string = split(pro_tlb[up_index], /:/);
local num_s: string = bin_p_tlb1[2];
local num_v: count = to_count(num_s);
num_v += 1;
pro_tlb[up_index] = fmt("%s:%d", bin_p_tlb1[1], num_v);
}
for(key in pro_tlb){
print fmt("[%d]=>%s", key, pro_tlb[key]);
}
hostlist[index]$protocols = join_string_array(",", pro_tlb);
}
}
# update timestamp
hostlist[index]$ts = hinfo$ts;
# update hostname iff a different hostname comes
if(hinfo$hostname != "" && hinfo$hostname != hostlist[index]$hostname){
# in the case of empty string, initialize it
# print fmt("initialize the hostname field of this host");
hostlist[index]$hostname = hinfo$hostname;
}
# update os
if(hinfo$os != "" && hinfo$os != hostlist[index]$os){
# print fmt("update os field of this host");
hostlist[index]$os = hinfo$os;
}
# update mac
# Although we confirm that mac should be set as the unique id,
# we reconsider it in the second branch in update_hostlist.
if(hinfo$mac != "" && hostlist[index]$mac == ""){
# initialize mac field
# print fmt("initialize mac field of this host");
hostlist[index]$mac = hinfo$mac;
}
# update username
if(hinfo$username != "" && hostlist[index]$username == ""){
# print fmt("update username field of this host");
hostlist[index]$username = hinfo$username;
}
}
# Precondition: hinfo comes from fragmentary records
# Postcondition: update contents of hostlist with hinfo
function update_hostlist(hinfo: HOST_INFO::host_info, protocol: string){
# print "prepare to update";
local has_updated: bool = F;
if(hinfo$mac != "" || hinfo$hostname != ""){
# I believe that mac addresses and hostnames can uniquely identify a host.
for(i in hostlist){
if(((hostlist[i]$mac == hinfo$mac) && (hinfo$mac != "")) || ((hostlist[i]$hostname == hinfo$hostname) && (hinfo$hostname != ""))){
# update
update_single_host(hinfo, protocol, i);
has_updated = T;
break;
}
}
if(!has_updated) {
# To avoid missing ips, we should initialize "ips" when we append a new item
hostlist[|hostlist|] = hinfo;
local wall_time: time = network_time();
local tmp_ip: string = fmt("%s", hinfo$ip);
# 这边应该也要-1
hostlist[|hostlist|-1]$ips += fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", wall_time) + tmp_ip);
has_updated = T;
}
}
# 为了icmp发现的主机能进入记录,暂时允许把ip作为主机唯一性考量
if(hinfo ?$ ip){
for(i in hostlist){
if(hostlist[i]$ip == hinfo$ip){# 如果有,更新一下,其实没有什么好更新的
print hostlist[i]$ip;
print hinfo$ip;
update_single_host(hinfo, protocol, i);
has_updated = T;
break;
}
}
# 如果没有,插入
if(!has_updated){
print "a new ip comes";
print hinfo$ip;
print |hostlist|;
hostlist[|hostlist|] = hinfo;
print |hostlist|;
local wall_time1: time = network_time();
local tmp_ip1: string = fmt("%s", hinfo$ip);
# print hostlist[|hostlist|-1];
# |hostlist|改变了,再对齐对应记录作修改,后面-1
hostlist[|hostlist|-1]$ips += fmt("%s", strftime("%Y-%m-%d-%H:%M:%S|", wall_time1) + tmp_ip1);
has_updated = T;
# 针对仅有ip的主机更新情况,不会再去下一个if分支
}
}
if(!has_updated){
# In this case, I can't confirm that this host
for(i in hostlist){
if(hinfo$ip == hostlist[i]$ip){
update_single_host(hinfo, protocol, i);
has_updated = T;
break;
}
}
if(!has_updated){
# At this point, all correct info should have been updated
print "incomplete information, skip it ", hinfo;
}
}
}
function check_ssh_hostname(id: conn_id, uid: string, host: addr){
when(local hostname = lookup_addr(host)){
local rec: HOST_INFO::host_info = [$ts = network_time(), $ip = host, $hostname = hostname, $description = "shh_auth"];
update_hostlist(rec, "ssh");
Log::write(HOST_INFO::HOST_INFO_LOG, rec);
}
}
event OS_version_found(c: connection, host: addr, OS: OS_version){
# print "an operating system has been fingerprinted";
# print fmt("the host running this OS is %s", host);
# print OS;
if(OS$genre != "UNKNOWN"){
local os_detail = fmt("%s %s", OS$genre, OS$detail);
local rec: HOST_INFO::host_info = [$ts = network_time(), $ip = host, $os = os_detail, $description = "OS_version_found"];
update_hostlist(rec, "os_fingerprint");
Log::write(HOST_INFO::HOST_INFO_LOG, rec);
}
# e.g [genre=UNKNOWN, detail=, dist=36, match_type=direct_inference]
# How to utilize this message?
}
# There is no point in removing dulipcated messages for a specific ip.
# Becuase ip addresses should not be the unique identification of a specific host.
# We should identity a specific host by ip and mac pairs which have the lastest network time.
event arp_reply(mac_src: string, mac_dst: string, SPA: addr, SHA: string, TPA: addr, THA: string){
# print "arp reply";
# print fmt("source mac: %s, destination mac: %s, SPA: %s, SHA: %s, TPA: %s, THA: %s", mac_src, mac_dst, SPA, SHA, TPA, THA);
# record ip and its mac address
# we don't these form of mac addresses:
# 00:00:00:00:00:00 and ff:ff:ff:ff:ff:ff
if(SHA != "ff:ff:ff:ff:ff:ff" && SHA != "00:00:00:00:00:00" && SPA != 0.0.0.0){
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = SPA, $mac = SHA, $description = "arp_reply" ];
update_hostlist(rec1, "arp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
}
if(THA != "ff:ff:ff:ff:ff:ff" && THA != "00:00:00:00:00:00" && TPA != 0.0.0.0){
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = TPA, $mac = THA, $description = "arp_reply" ];
update_hostlist(rec2, "arp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
}
}
event arp_request(mac_src: string, mac_dst: string, SPA: addr, SHA: string, TPA: addr, THA: string){
# print "arp request";
# print fmt("source mac: %s, destination mac: %s, SPA: %s, SHA: %s, TPA: %s, THA: %s", mac_src, mac_dst, SPA, SHA, TPA, THA);
if(SHA != "ff:ff:ff:ff:ff:ff" && SHA != "00:00:00:00:00:00" && SPA != 0.0.0.0){
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = SPA, $mac = SHA, $description = "arp_request" ];
update_hostlist(rec1, "arp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
}
if(THA != "ff:ff:ff:ff:ff:ff" && THA != "00:00:00:00:00:00" && TPA != 0.0.0.0){
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = TPA, $mac = THA, $description = "arp_request" ];
update_hostlist(rec2, "arp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
}
}
event bad_arp(SPA: addr, SHA: string, TPA: addr, THA: string, explanation: string){
print fmt("this arp packet is bad because: %s", explanation);
}
event dhcp_message(c: connection, is_orig: bool, msg: DHCP::Msg, options: DHCP::Options){
# print "A dhcp message is coming!";
# print msg;
# print options;
if(options ?$ host_name && options ?$ addr_request && options ?$ client_id){ # It occurred once: missing client_id, check it in advance
print "haha";
# print options;
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = options$addr_request, $mac = options$client_id$hwaddr, $hostname = options$host_name, $description = "dhcp_message1" ];
update_hostlist(rec1, "dhcp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
} else{
if(msg$yiaddr != 0.0.0.0){
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = msg$yiaddr, $mac = msg$chaddr, $description = "dhcp_message2" ];
update_hostlist(rec2, "dhcp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
}
}
}
event ssh_auth_successful(c: connection, auth_method_none: bool){
for ( host in set(c$id$orig_h, c$id$resp_h) )
{
check_ssh_hostname(c$id, c$uid, host);
}
}
event dns_query_reply(c: connection, msg: dns_msg, query: string, qtype: count, qclass: count){
# print "here comes a dns query reply";
# print c;
# print msg;
# print query;
# print qtype;
}
event dns_A_reply(c: connection, msg: dns_msg, ans: dns_answer, a: addr){
# print "********************************TYPE A REPLY*********************";
# print c;
# print msg;#[id=0, opcode=0, rcode=0, QR=T, AA=T, TC=F, RD=F, RA=F, Z=0, num_queries=0, num_answers=1, num_auth=0, num_addl=0]
# print ans;#[answer_type=1, query=brwa86bad339915.local, qtype=1, qclass=32769, TTL=4.0 mins]
# print a;#192.168.1.108
local rec: HOST_INFO::host_info = [$ts = network_time(), $ip = a, $hostname = ans$query, $description = "dns_A_reply" ];
update_hostlist(rec, "dns");
Log::write(HOST_INFO::HOST_INFO_LOG, rec);
}
event dns_AAAA_reply(c: connection, msg: dns_msg, ans: dns_answer, a: addr){
local rec: HOST_INFO::host_info = [$ts = network_time(), $ip = a, $hostname = ans$query, $description = "dns_AAAA_reply" ];
update_hostlist(rec, "dns");
Log::write(HOST_INFO::HOST_INFO_LOG, rec);
}
# I want to get hostnames by event related to DNS.
event dns_message(c: connection, is_orig: bool, msg: dns_msg, len: count){
# print "dns_message";
# print "1";
# print c$dns_state$pending_queries;
if(c ?$dns_state){
for(index1 in c$dns_state$pending_queries){
# print "2";
# print c$dns_state$pending_queries[index1];
for(index2 in c$dns_state$pending_queries[index1]$vals){
local rec: DNS::Info = c$dns_state$pending_queries[index1]$vals[index2];
# print rec;
if(rec ?$ answers){
print "It has answers!!!!";
print rec;
}
if(rec ?$ qtype_name){
switch(rec$qtype_name){
case "A":
# print "type A";
# print fmt("host %s's query field: %s", rec$id$orig_h, rec$query);
break;
case "AAAA":
# print "type AAAA";
break;
case "CNAME":
# print "type CNAME";
break;
case "PTR":
# print "type PTR";
break;
case "MX":
# print "type MX";
break;
case "NS":
# print "type NS";
break;
default:
# print fmt("unexpected type: %s", rec$qtype_name);
break;
}
}
# Unfortunately, it is not the hostname. :(
}
}
}
}
event dns_mapping_valid(dm: dns_mapping){
print "dns_mapping_valid";
print dm;
}
event dns_mapping_altered(dm: dns_mapping, old_addrs: addr_set, new_addrs: addr_set){
print "dns_mapping_altered";
print dm;
}
event dns_mapping_lost_name(dm: dns_mapping){
print "dns_mapping_lost_name";
print dm;
}
event dns_mapping_new_name(dm: dns_mapping){
print "dns_mapping_new_name";
print dm;
}
event dns_mapping_unverified(dm: dns_mapping){
print "dns_mapping_unverified";
print dm;
}
event ntlm_authenticate(c: connection, request: NTLM::Authenticate){
print c;
print request;
if(request ?$ user_name){
print fmt("username: %s", request$user_name);
}
}
# collect more protocol information here
event protocol_confirmation(c: connection, atype: Analyzer::Tag, aid: count){
local src_ip: addr;
local dst_ip: addr;
local protocol: string;
if(c$id ?$ orig_h && c$id ?$ resp_h){
src_ip = c$id$orig_h;
dst_ip = c$id$resp_h;
}
switch(atype){
case Analyzer::ANALYZER_AYIYA:
protocol = "ayiya";
break;
case Analyzer::ANALYZER_BACKDOOR:
protocol = "backdoor";
break;
case Analyzer::ANALYZER_BITTORRENT:
protocol = "bittorrent";
break;
case Analyzer::ANALYZER_BITTORRENTTRACKER:
protocol = "bittorrenttracker";
break;
case Analyzer::ANALYZER_CONNSIZE:
protocol = "connsize";#??
break;
case Analyzer::ANALYZER_DCE_RPC:
protocol = "dce_rpc";
break;
case Analyzer::ANALYZER_DHCP:
protocol = "dhcp";
break;
case Analyzer::ANALYZER_DNP3_TCP:
protocol = "dnp3_tcp";
break;
case Analyzer::ANALYZER_DNP3_UDP:
protocol = "dnp3_udp";
break;
case Analyzer::ANALYZER_CONTENTS_DNS:
protocol = "contents_dns";
break;
case Analyzer::ANALYZER_DNS:
protocol = "dns";
break;
case Analyzer::ANALYZER_FTP_DATA:
protocol = "ftp_data";
break;
case Analyzer::ANALYZER_IRC_DATA:
protocol = "irc_data";
break;
case Analyzer::ANALYZER_FINGER:
protocol = "finger";
break;
case Analyzer::ANALYZER_FTP:
protocol = "ftp";
break;
case Analyzer::ANALYZER_FTP_ADAT:
protocol = "ftp_adat";
break;
case Analyzer::ANALYZER_GNUTELLA:
protocol = "gnutella";
break;
case Analyzer::ANALYZER_GSSAPI:
protocol = "gssapi";
break;
case Analyzer::ANALYZER_GTPV1:
protocol = "gtpv1";
break;
case Analyzer::ANALYZER_HTTP:
protocol = "http";
break;
case Analyzer::ANALYZER_ICMP:
protocol = "icmp";
break;
case Analyzer::ANALYZER_IDENT:
protocol = "ident";
break;
case Analyzer::ANALYZER_IMAP:
protocol = "imap";
break;
case Analyzer::ANALYZER_INTERCONN:
protocol = "interconn";
break;
case Analyzer::ANALYZER_IRC:
protocol = "irc";
break;
case Analyzer::ANALYZER_KRB:
protocol = "krb";
break;
case Analyzer::ANALYZER_KRB_TCP:
protocol = "krb_tcp";# the previous one is its substring, how to handle this situation?
break;
case Analyzer::ANALYZER_CONTENTS_RLOGIN:
protocol = "contents_rlogin";
break;
case Analyzer::ANALYZER_CONTENTS_RSH:
protocol = "contents_rsh";
break;
case Analyzer::ANALYZER_LOGIN:
protocol = "login";
break;
case Analyzer::ANALYZER_NVT:
protocol = "nvt";
break;
case Analyzer::ANALYZER_RLOGIN:
protocol = "rlogin";
break;
case Analyzer::ANALYZER_RSH:
protocol = "rsh";
break;
case Analyzer::ANALYZER_TELNET:
protocol = "telnet";
break;
case Analyzer::ANALYZER_MODBUS:
protocol = "modbus";
break;
case Analyzer::ANALYZER_MYSQL:
protocol = "mysql";
break;
case Analyzer::ANALYZER_CONTENTS_NCP:
protocol = "contents_ncp";
break;
case Analyzer::ANALYZER_NCP:
protocol = "ncp";
break;
case Analyzer::ANALYZER_CONTENTS_NETBIOSSSN:
protocol = "contents_netbiosssn";
break;
case Analyzer::ANALYZER_NETBIOSSSN:
protocol = "netbiosssn";
break;
case Analyzer::ANALYZER_NTLM:
protocol = "ntlm";
break;
case Analyzer::ANALYZER_NTP:
protocol = "ntp";
break;
case Analyzer::ANALYZER_PIA_TCP:
protocol = "pia_tcp";
break;
case Analyzer::ANALYZER_PIA_UDP:
protocol = "pia_udp";
break;
case Analyzer::ANALYZER_POP3:
protocol = "pop3";
break;
case Analyzer::ANALYZER_RADIUS:
protocol = "radius";
break;
case Analyzer::ANALYZER_RDP:
protocol = "rdp";
break;
case Analyzer::ANALYZER_RFB:
protocol = "rfb";
break;
case Analyzer::ANALYZER_CONTENTS_NFS:
protocol = "contents_nfs";
break;
case Analyzer::ANALYZER_CONTENTS_RPC:
protocol = "contents_rpc";
break;
case Analyzer::ANALYZER_MOUNT:
protocol = "mount";
break;
case Analyzer::ANALYZER_NFS:
protocol = "nfs";
break;
case Analyzer::ANALYZER_PORTMAPPER:
protocol = "portmapper";
break;
case Analyzer::ANALYZER_SIP:
protocol = "sip";
break;
case Analyzer::ANALYZER_CONTENTS_SMB:
protocol = "contents_smb";
break;
case Analyzer::ANALYZER_SMB:
protocol = "smb";
break;
case Analyzer::ANALYZER_SMTP:
protocol = "smtp";
break;
case Analyzer::ANALYZER_SNMP:
protocol = "snmp";
break;
case Analyzer::ANALYZER_SOCKS:
protocol = "socks";
break;
case Analyzer::ANALYZER_SSH:
protocol = "ssh";
break;
case Analyzer::ANALYZER_DTLS:
protocol = "dtls";
break;
case Analyzer::ANALYZER_SSL:
protocol = "ssl";
break;
case Analyzer::ANALYZER_STEPPINGSTONE:
protocol = "steppingstone";
break;
case Analyzer::ANALYZER_SYSLOG:
protocol = "syslog";
break;
case Analyzer::ANALYZER_CONTENTLINE:
protocol = "contentline";
break;
case Analyzer::ANALYZER_CONTENTS:
protocol = "contents";
break;
case Analyzer::ANALYZER_TCP:
protocol = "tcp";
break;
case Analyzer::ANALYZER_TCPSTATS:
protocol = "tcpstats";
break;
case Analyzer::ANALYZER_TEREDO:
protocol = "teredo";
break;
case Analyzer::ANALYZER_UDP:
protocol = "udp";
break;
case Analyzer::ANALYZER_XMPP:
protocol = "xmpp";
break;
case Analyzer::ANALYZER_ZIP:
protocol = "zip";
break;
default:
print "Unexpected error: unknown protocol type!";
protocol = "error";
break;
}
if(protocol == "error")
return;
# both endpoints share the same protocol
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = src_ip, $description = protocol ];
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = dst_ip, $description = protocol ];
update_hostlist(rec1, protocol);
update_hostlist(rec2, protocol);
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
# print "a new protocol is logged";
}
# try to get software info
# Unfortunately, they haven't been triggered
event software_unparsed_version_found(c: connection, host: addr, str: string){
# fill app record
}
event software_version_found(c: connection, host: addr, s: software, descr: string){
# fill app record
}
event bro_init() &priority=10{
# create our log stream at the very beginning
Log::create_stream(HOST_INFO::HOST_INFO_LOG, [$columns=host_info, $path="host-info"]);
# the other log stream to output of a summary of host-info
Log::create_stream(HOST_INFO::SUMMARY_HOST_LOG, [$columns=host_info, $path="host-summary"]);
# 同样地,建立KG要存储的内容的日志流
Log::create_stream(HOST_INFO::NET_EVENTS_LOG, [$columns=event_info, $path="network_events"]);# kg_info存储"三元组"形式的知识
# some useless fields are filtered
local filter: Log::Filter = [$name="without_dscription", $path="simple_hosts",
$include=set("ip","hostname","username","mac","os","ips","protocols")];
Log::add_filter(HOST_INFO::SUMMARY_HOST_LOG, filter);
}
# 基本数据包
# A raw packet header, consisting of L2 header and everything in pkt_hdr. .
# 比起packet_contents,raw_packet提供的信息更少,而且bro提出这两个事件的开销很大
event raw_packet(p: raw_pkt_hdr){
print "raw_packet!";
print p;
# print p;
# if(p?$l2){
# print p$l2;
# } else {
# print "no l2";
# }
# if(p?$ip){
# print p$ip;
# } else {
# print "no ip field";
# }
# if(p?$ip6){
# print p$ip6;
# } else {
# print "no ip6 field";
# }
# if(p?$tcp){
# print p$tcp;
# } else {
# print "no tcp field";
# }
# if(p?$udp){
# print p$udp;
# } else {
# print "no udp field";
# }
# if(p?$icmp){
# print p$icmp;
# } else {
# print "no icmp field";
# }
}
event packet_contents(c: connection, contents: string){
print "packet_contents!";
# print c$id$resp_p;
if(c$id$resp_p == 111/udp){
# 这种情况视作一个rpc事件,对应phase2中的135个分组(总共148个)
print "portmapper protocol";
print c;
print contents;
num_packets += 1;
} else {
print c$id$resp_p;
}
# print contents;
# p_num -= 1;
}
# 数据集分析的事件,同样要关心里面涉及的主机信息
# 网络流量图谱的基于bro日志构建,转为Gremlin脚本(属性设定,加点加边)输出
# 网络流量图谱的分析计算依赖于Gremlin提供的强大的图计算能力
# phase-1-dump
event icmp_echo_request(c: connection, icmp: icmp_conn, id: count, seq: count, payload: string){
print "icmp_echo_request!";
# print c;
# 记录资产,主机即资产
if(c$id ?$ orig_h && c$id ?$ resp_h){
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = c$id$orig_h, $description = "icmp_echo_request"];
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = c$id$resp_h, $description = "icmp_echo_request"];
update_hostlist(rec1, "icmp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
update_hostlist(rec2, "icmp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
}
# 记录事件,事件以边的形式呈现,必须连接两个点
local t: time = network_time();
local rec3: HOST_INFO::event_info = [$ts = network_time(), $real_time = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S", t)),
$event_type = ICMP_ECHO_REQUEST, $src_ip = c$id$orig_h, $src_p = c$id$orig_p,
$dst_ip = c$id$resp_h, $dst_p = c$id$resp_p];
Log::write(HOST_INFO::NET_EVENTS_LOG, rec3);
# print icmp;
}
event icmp_echo_reply(c: connection, icmp: icmp_conn, id: count, seq: count, payload: string){
print "icmp_echo_reply!";
# 记录资产,主机即资产
if(c$id ?$ orig_h && c$id ?$ resp_h){
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = c$id$orig_h, $description = "icmp_echo_reply"];
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = c$id$resp_h, $description = "icmp_echo_reply"];
update_hostlist(rec1, "icmp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
update_hostlist(rec2, "icmp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
}
# 记录事件,事件以边的形式呈现,必须连接两个点
local t: time = network_time();
local rec3: HOST_INFO::event_info = [$ts = network_time(), $real_time = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S", t)),
$event_type = ICMP_ECHO_REPLY, $src_ip = c$id$orig_h, $src_p = c$id$orig_p,
$dst_ip = c$id$resp_h, $dst_p = c$id$resp_p];
Log::write(HOST_INFO::NET_EVENTS_LOG, rec3);
# print icmp;
}
event icmp_time_exceeded(c: connection, icmp: icmp_conn, code: count, context: icmp_context){
print "icmp_time_exceeded!";
}
event icmp_error_message(c: connection, icmp: icmp_conn, code: count, context: icmp_context){
print "icmp_error_message!";
}
event icmp_neighbor_advertisement(c: connection, icmp: icmp_conn, router: bool, solicited: bool,
override: bool, tgt: addr, options: icmp6_nd_options){
print "icmp_neighbor_advertisement!";
}
event icmp_neighbor_solicitation(c: connection, icmp: icmp_conn, tgt: addr, options: icmp6_nd_options){
print "icmp_neighbor_solicitation!";
}
event icmp_packet_too_big(c: connection, icmp: icmp_conn, code: count, context: icmp_context){
print "icmp_packet_too_big!";
}
event icmp_parameter_problem(c: connection, icmp: icmp_conn, code: count, context: icmp_context){
print "icmp_parameter_problem!";
}
event icmp_redirect(c: connection, icmp: icmp_conn, tgt: addr, dest: addr, options: icmp6_nd_options){
print "icmp_redirect!";
}
event icmp_router_advertisement(c: connection, icmp: icmp_conn, cur_hop_limit: count, managed: bool,
other: bool, home_agent: bool, pref: count, proxy: bool, res: count, router_lifetime: interval,
reachable_time: interval, retrans_timer: interval, options: icmp6_nd_options){
print "icmp_router_advertisement!";
}
event icmp_router_solicitation(c: connection, icmp: icmp_conn, options: icmp6_nd_options){
print "icmp_router_solicitation!";
}
event icmp_sent(c: connection, icmp: icmp_conn){
print "icmp_sent!";
}
event icmp_sent_payload(c: connection, icmp: icmp_conn, payload: string){
print "icmp_sent_payload!";
}
event icmp_unreachable(c: connection, icmp: icmp_conn, code: count, context: icmp_context){
print "icmp_unreachable!";
# 记录资产,主机即资产
if(c$id ?$ orig_h && c$id ?$ resp_h){
local rec1: HOST_INFO::host_info = [$ts = network_time(), $ip = c$id$orig_h, $description = "icmp_unreachable"];
local rec2: HOST_INFO::host_info = [$ts = network_time(), $ip = c$id$resp_h, $description = "icmp_unreachable"];
update_hostlist(rec1, "icmp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec1);
update_hostlist(rec2, "icmp");
Log::write(HOST_INFO::HOST_INFO_LOG, rec2);
}
# 记录事件,事件以边的形式呈现,必须连接两个点
local t: time = network_time();
local rec3: HOST_INFO::event_info = [$ts = network_time(), $real_time = fmt("%s", strftime("%Y-%m-%d-%H:%M:%S", t)),
$event_type = ICMP_UNREACHABLE, $src_ip = c$id$orig_h, $src_p = c$id$orig_p,
$dst_ip = c$id$resp_h, $dst_p = c$id$resp_p];
Log::write(HOST_INFO::NET_EVENTS_LOG, rec3);
# print icmp;
}
# phase-2-dump
# pm related
# 阶段2需要自己定义事件了,自带的事件没有触发
# 从new_packet,packet_contents出发
event mount_proc_mnt(c: connection, info: MOUNT3::info_t, req: MOUNT3::dirmntargs_t, rep: MOUNT3::mnt_reply_t){
print "mount_proc_mnt!";
}
event mount_proc_not_implemented(c: connection, info: MOUNT3::info_t, proc: MOUNT3::proc_t){
print "mount_proc_not_implemented!";
}
event mount_proc_null(c: connection, info: MOUNT3::info_t){
print "mount_proc_null!";
}
event mount_proc_umnt(c: connection, info: MOUNT3::info_t, req: MOUNT3::dirmntargs_t){
print "mount_proc_umnt!";
}
event mount_proc_umnt_all(c: connection, info: MOUNT3::info_t, req: MOUNT3::dirmntargs_t){
print "mount_proc_umnt_all!";
}
event mount_reply_status(n: connection, info: MOUNT3::info_t){
print "mount_reply_status!";
}
event nfs_proc_create(c: connection, info: NFS3::info_t, req: NFS3::diropargs_t, rep: NFS3::newobj_reply_t){
print "nfs_proc_create!";
}
event nfs_proc_getaddr(c: connection, info: NFS3::info_t, fh: string, attrs: NFS3::fattr_t){
print "nfs_proc_getaddr!";
}
event nfs_proc_link(c: connection, info: NFS3::info_t, req: NFS3::linkargs_t, rep: NFS3::link_reply_t){
print "nfs_proc_link!";
}
event nfs_proc_lookup(c: connection, info: NFS3::info_t, req: NFS3::diropargs_t, rep: NFS3::lookup_reply_t){
print "nfs_proc_lookup!";
}
event nfs_proc_mkdir(c: connection, info: NFS3::info_t, req: NFS3::diropargs_t, rep: NFS3::newobj_reply_t){
print "nfs_proc_mkdir!";
}
event nfs_proc_not_implemented(c: connection, info: NFS3::info_t, proc: NFS3::proc_t){
print "nfs_proc_not_implemented!";