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hosts.go
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hosts.go
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package structure
import (
"fmt"
"net"
"github.com/activecm/rita/config"
"github.com/activecm/rita/database"
"github.com/activecm/rita/datatypes/structure"
"github.com/activecm/rita/resources"
mgo "github.com/globalsign/mgo"
"github.com/globalsign/mgo/bson"
)
// BuildHostsCollection builds the 'host' collection from the `uconn` collection.
func BuildHostsCollection(res *resources.Resources) {
// Name of source collection which will be aggregated into the new collection
sourceCollectionName := res.Config.T.Structure.UniqueConnTable
// Name of the new collection
newCollectionName := res.Config.T.Structure.HostTable
// Desired indexes
keys := []mgo.Index{
{Key: []string{"ip"}, Unique: true},
{Key: []string{"local"}},
{Key: []string{"ipv4"}},
{Key: []string{"ipv4_binary"}},
}
// Aggregate it!
errorCheck := res.DB.CreateCollection(newCollectionName, keys)
if errorCheck != nil {
res.Log.Error("Failed: ", newCollectionName, errorCheck)
return
}
getHosts(res, res.Config, sourceCollectionName, newCollectionName)
}
//getHosts aggregates the individual hosts from the source collection and
//labels them as private or public as well as ipv4 or ipv6. The aggregation
//includes padding for a binary encoding of the ip address.
func getHosts(res *resources.Resources, conf *config.Config, sourceCollection string, targetCollection string) {
session := res.DB.Session.Copy()
defer session.Close()
// Aggregation to populate the hosts collection
// nolint: vet
uconnsFindQuery := []bson.D{
{
{"$project", bson.D{
{"hosts", []interface{}{
bson.D{
{"ip", "$src"},
{"local", "$local_src"},
{"src", true},
{"max_duration", "$max_duration"},
},
bson.D{
{"ip", "$dst"},
{"local", "$local_dst"},
{"dst", true},
{"max_duration", "$max_duration"},
},
}},
}},
},
{
{"$unwind", "$hosts"},
},
{
{"$group", bson.D{
{"_id", "$hosts.ip"},
{"local", bson.D{
{"$first", "$hosts.local"},
}},
{"src", bson.D{
{"$push", "$hosts.src"},
}},
{"dst", bson.D{
{"$push", "$hosts.dst"},
}},
{"max_duration", bson.D{
{"$max", "$hosts.max_duration"},
}},
}},
},
{
{"$project", bson.D{
// Disable the normal _id field and use ip instead
{"_id", 0},
{"ip", "$_id"},
{"local", 1},
{"ipv4", bson.D{
// Determines if the ip (_id) is IPv4 rather than IPv6.
// If the ip does not contain the ':' character (IPv6 separator)
// it is IPv4.
{"$cond", bson.D{
{"if", bson.D{
{"$eq", []interface{}{
bson.D{
{"$indexOfCP", []interface{}{
"$_id", ":",
}},
},
-1,
}},
}},
{"then", bson.D{
{"$literal", true},
}},
{"else", bson.D{
{"$literal", false},
}},
}},
}},
// Store the number of times the IP was the src of a connection
{"count_src", bson.D{
{"$size", "$src"},
}},
// Store the number of times the IP was the dst of a connection
{"count_dst", bson.D{
{"$size", "$dst"},
}},
{"max_duration", 1},
}},
},
// Instead of sending this output directly to a new collection,
// we need to iterate in order to convert IPv4 strings to binary
}
var queryRes struct {
ID bson.ObjectId `bson:"_id,omitempty"`
IP string `bson:"ip"`
Local bool `bson:"local"`
IPv4 bool `bson:"ipv4"`
CountSrc int32 `bson:"count_src"`
CountDst int32 `bson:"count_dst"`
MaxDuration float32 `bson:"max_duration"`
}
// execute query
uconnIter := res.DB.AggregateCollection(sourceCollection, session, uconnsFindQuery)
var output []*structure.Host
// iterate over results and convert IPv4 string to binary representation
for uconnIter.Next(&queryRes) {
entry := &structure.Host{
IP: queryRes.IP,
Local: queryRes.Local,
IPv4: queryRes.IPv4,
CountSrc: queryRes.CountSrc,
CountDst: queryRes.CountDst,
MaxDuration: queryRes.MaxDuration,
}
ip := net.ParseIP(queryRes.IP)
if queryRes.IPv4 {
entry.IPv4Binary = ipv4ToBinary(ip)
} // else { // *** Note: for future ipv6 support *** //
// entry.IPv6Binary = ipv6ToBinary(ip)
// }
if queryRes.Local {
// add highest beacon conncount and score
var beaconRes struct {
ConnectionCount int `bson:"connection_count"`
Score float64 `bson:"score"`
}
err1 := session.DB(res.DB.GetSelectedDB()).C(conf.T.Beacon.BeaconTable).Find(bson.M{"src": queryRes.IP}).Sort("-score").Limit(1).One(&beaconRes)
if err1 == nil {
entry.MaxBeaconScore = beaconRes.Score
entry.MaxBeaconConnCount = beaconRes.ConnectionCount
}
// Count how many times the host made a TXT query
txtCount, err2 := session.DB(res.DB.GetSelectedDB()).C(conf.T.Structure.DNSTable).
Find(bson.M{
"$and": []bson.M{
bson.M{"id_orig_h": queryRes.IP},
bson.M{"qtype_name": "TXT"},
}}).Count()
if err2 == nil {
entry.TxtQueryCount = txtCount
}
}
output = append(output, entry)
}
hostWriter(output, res.DB, conf, targetCollection)
}
// hostWriter inserts host entries into the database in bulk using buffer
func hostWriter(output []*structure.Host, resDB *database.DB, resConf *config.Config, targetCollection string) {
// buffer length controls amount of ram used while exporting
bufferLen := resConf.S.Bro.ImportBuffer
// Create a buffer to hold a portion of the results
buffer := make([]interface{}, 0, bufferLen)
// while we can still iterate through the data add to the buffer
for _, data := range output {
// if the buffer is full, send to the remote database and clear buffer
if len(buffer) == bufferLen {
err := bulkWriteHosts(buffer, resDB, resConf, targetCollection)
if err != nil && err.Error() != "invalid BulkError instance: no errors" {
fmt.Println(buffer)
fmt.Println("write error 2", err)
}
buffer = buffer[:0]
}
buffer = append(buffer, data)
}
//send any data left in the buffer to the remote database
err := bulkWriteHosts(buffer, resDB, resConf, targetCollection)
if err != nil && err.Error() != "invalid BulkError instance: no errors" {
fmt.Println(buffer)
fmt.Println("write error 2", err)
}
}
// bulkWriteHosts uses MongoDB's Bulk API to insert entries into a collection.
// It also allows out of order writes to speed things up. This is the fastest
// way we know of to get data into the database.
func bulkWriteHosts(buffer []interface{}, resDB *database.DB, resConf *config.Config, targetCollection string) error {
ssn := resDB.Session.Copy()
defer ssn.Close()
// set up for bulk write to database
bulk := ssn.DB(resDB.GetSelectedDB()).C(targetCollection).Bulk()
// writes can be sent out of order
bulk.Unordered()
// inserts everything in the buffer into the bulk write object as a list
// of single interfaces
bulk.Insert(buffer...)
// runs all queued operations
_, err := bulk.Run()
return err
}