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analyzer.go
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analyzer.go
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package blacklist
import (
"strconv"
"sync"
"github.com/activecm/rita/config"
"github.com/activecm/rita/database"
"github.com/globalsign/mgo/bson"
)
type (
//analyzer : structure for host analysis
analyzer struct {
chunk int //current chunk (0 if not on rolling analysis)
chunkStr string //current chunk (0 if not on rolling analysis)
db *database.DB // provides access to MongoDB
conf *config.Config // contains details needed to access MongoDB
analyzedCallback func(update) // called on each analyzed result
closedCallback func() // called when .close() is called and no more calls to analyzedCallback will be made
analysisChannel chan hostRes // holds unanalyzed data
analysisWg sync.WaitGroup // wait for analysis to finish
}
)
//newAnalyzer creates a new collector for gathering data
func newAnalyzer(chunk int, db *database.DB, conf *config.Config, analyzedCallback func(update), closedCallback func()) *analyzer {
return &analyzer{
chunk: chunk,
chunkStr: strconv.Itoa(chunk),
db: db,
conf: conf,
analyzedCallback: analyzedCallback,
closedCallback: closedCallback,
analysisChannel: make(chan hostRes),
}
}
//collect sends a chunk of data to be analyzed
func (a *analyzer) collect(data hostRes) {
a.analysisChannel <- data
}
//close waits for the collector to finish
func (a *analyzer) close() {
close(a.analysisChannel)
a.analysisWg.Wait()
a.closedCallback()
}
//start kicks off a new analysis thread
func (a *analyzer) start() {
a.analysisWg.Add(1)
go func() {
ssn := a.db.Session.Copy()
defer ssn.Close()
for data := range a.analysisChannel {
ip := data.IP
connectedSrcHosts := a.getBlacklistedIPConnections(ip, "dst", "src")
connectedDstHosts := a.getBlacklistedIPConnections(ip, "src", "dst")
for _, entry := range connectedSrcHosts {
var res3 []hostRes
newblsrc := false
_ = ssn.DB(a.db.GetSelectedDB()).C(a.conf.T.Structure.HostTable).Find(bson.M{"ip": entry.Host, "dat.bl": ip}).All(&res3)
if !(len(res3) > 0) {
newblsrc = true
// fmt.Println("host no results", res3, ip)
}
blsrcOutput := hasBlacklistedDstQuery(a.chunk, ip, entry, newblsrc)
// set to writer channel
a.analyzedCallback(blsrcOutput)
}
for _, entry := range connectedDstHosts {
var res3 []hostRes
newbldst := false
_ = ssn.DB(a.db.GetSelectedDB()).C(a.conf.T.Structure.HostTable).Find(bson.M{"ip": entry.Host, "dat.bl": ip}).All(&res3)
if !(len(res3) > 0) {
newbldst = true
// fmt.Println("host no results", res3, ip)
}
bldstOutput := hasBlacklistedSrcQuery(a.chunk, ip, entry, newbldst)
// set to writer channel
a.analyzedCallback(bldstOutput)
}
}
a.analysisWg.Done()
}()
}
//hasBlacklistedQuery ...
// If the internal system initiated the connection, then bl_out_count
// holds the number of unique blacklisted IPs the given host contacted.
func hasBlacklistedDstQuery(chunk int, ip string, entry uconnRes, newFlag bool) update {
var output update
// create query
query := bson.M{}
if newFlag {
query["$push"] = bson.M{
"dat": bson.M{
"bl": ip,
"bl_out_count": 1,
"bl_total_bytes": entry.TotalBytes,
"bl_conn_count": entry.Connections,
"cid": chunk,
}}
// create selector for output
output.query = query
output.selector = bson.M{"ip": entry.Host}
} else {
query["$set"] = bson.M{
"dat.$.bl_conn_count": entry.Connections,
"dat.$.bl_total_bytes": entry.TotalBytes,
"dat.$.bl_out_count": 1,
"dat.$.cid": chunk,
}
// create selector for output
output.query = query
output.selector = bson.M{"ip": entry.Host, "dat.bl": ip}
}
return output
}
//hasBlacklistedQuery ...
// If the internal system initiated the connection, then bl_out_count
// holds the number of unique blacklisted IPs the given host contacted.
func hasBlacklistedSrcQuery(chunk int, ip string, entry uconnRes, newFlag bool) update {
var output update
// create query
query := bson.M{}
if newFlag {
query["$push"] = bson.M{
"dat": bson.M{
"bl": ip,
"bl_in_count": 1,
"bl_total_bytes": entry.TotalBytes,
"bl_conn_count": entry.Connections,
"cid": chunk,
}}
// create selector for output
output.query = query
output.selector = bson.M{"ip": entry.Host}
} else {
query["$set"] = bson.M{
"dat.$.bl_conn_count": entry.Connections,
"dat.$.bl_total_bytes": entry.TotalBytes,
"dat.$.bl_in_count": 1,
"dat.$.cid": chunk,
}
// create selector for output
output.query = query
output.selector = bson.M{"ip": entry.Host, "dat.bl": ip}
}
return output
}
// getBlaclistedIPConnections
func (a *analyzer) getBlacklistedIPConnections(ip string, field1 string, field2 string) []uconnRes {
ssn := a.db.Session.Copy()
defer ssn.Close()
var blIPs []uconnRes
blIPQuery := []bson.M{
bson.M{"$match": bson.M{field1: ip}},
bson.M{"$unwind": "$dat"},
bson.M{"$group": bson.M{
"_id": "$" + field2,
"bl_conn_count": bson.M{"$sum": "$dat.count"},
"bl_in_count": bson.M{"$sum": 1},
"bl_total_bytes": bson.M{"$sum": "$dat.tbytes"},
}},
}
_ = ssn.DB(a.db.GetSelectedDB()).C(a.conf.T.Structure.UniqueConnTable).Pipe(blIPQuery).All(&blIPs)
return blIPs
}