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/*
* This file is part of caronte (https://github.com/eciavatta/caronte).
* Copyright (c) 2020 Emiliano Ciavatta.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"context"
"fmt"
log "github.com/sirupsen/logrus"
"time"
)
const DefaultQueryLimit = 50
const MaxQueryLimit = 200
type Connection struct {
ID RowID `json:"id" bson:"_id"`
SourceIP string `json:"ip_src" bson:"ip_src"`
DestinationIP string `json:"ip_dst" bson:"ip_dst"`
SourcePort uint16 `json:"port_src" bson:"port_src"`
DestinationPort uint16 `json:"port_dst" bson:"port_dst"`
StartedAt time.Time `json:"started_at" bson:"started_at"`
ClosedAt time.Time `json:"closed_at" bson:"closed_at"`
ClientBytes int `json:"client_bytes" bson:"client_bytes"`
ServerBytes int `json:"server_bytes" bson:"server_bytes"`
ClientDocuments int `json:"client_documents" bson:"client_documents"`
ServerDocuments int `json:"server_documents" bson:"server_documents"`
ProcessedAt time.Time `json:"processed_at" bson:"processed_at"`
MatchedRules []RowID `json:"matched_rules" bson:"matched_rules"`
Hidden bool `json:"hidden" bson:"hidden,omitempty"`
Marked bool `json:"marked" bson:"marked,omitempty"`
Comment string `json:"comment" bson:"comment,omitempty"`
Service Service `json:"service" bson:"-"`
}
type ConnectionsFilter struct {
From string `form:"from" binding:"omitempty,hexadecimal,len=24"`
To string `form:"to" binding:"omitempty,hexadecimal,len=24"`
ServicePort uint16 `form:"service_port"`
ClientAddress string `form:"client_address" binding:"omitempty,ip"`
ClientPort uint16 `form:"client_port"`
MinDuration uint `form:"min_duration"`
MaxDuration uint `form:"max_duration" binding:"omitempty,gtefield=MinDuration"`
MinBytes uint `form:"min_bytes"`
MaxBytes uint `form:"max_bytes" binding:"omitempty,gtefield=MinBytes"`
StartedAfter int64 `form:"started_after" `
StartedBefore int64 `form:"started_before" binding:"omitempty,gtefield=StartedAfter"`
ClosedAfter int64 `form:"closed_after" `
ClosedBefore int64 `form:"closed_before" binding:"omitempty,gtefield=ClosedAfter"`
Hidden bool `form:"hidden"`
Marked bool `form:"marked"`
MatchedRules []string `form:"matched_rules" binding:"dive,hexadecimal,len=24"`
PerformedSearch string `form:"performed_search" binding:"omitempty,hexadecimal,len=24"`
Limit int64 `form:"limit"`
}
type ConnectionsController struct {
storage Storage
searchController *SearchController
servicesController *ServicesController
}
func NewConnectionsController(storage Storage, searchesController *SearchController,
servicesController *ServicesController) ConnectionsController {
return ConnectionsController{
storage: storage,
searchController: searchesController,
servicesController: servicesController,
}
}
func (cc ConnectionsController) GetConnections(c context.Context, filter ConnectionsFilter) []Connection {
var connections []Connection
query := cc.storage.Find(Connections).Context(c)
from, _ := RowIDFromHex(filter.From)
if !from.IsZero() {
query = query.Filter(OrderedDocument{{"_id", UnorderedDocument{"$lte": from}}})
}
to, _ := RowIDFromHex(filter.To)
if !to.IsZero() {
query = query.Filter(OrderedDocument{{"_id", UnorderedDocument{"$gte": to}}})
} else {
query = query.Sort("_id", false)
}
if filter.ServicePort > 0 {
query = query.Filter(OrderedDocument{{"port_dst", filter.ServicePort}})
}
if len(filter.ClientAddress) > 0 {
query = query.Filter(OrderedDocument{{"ip_src", filter.ClientAddress}})
}
if filter.ClientPort > 0 {
query = query.Filter(OrderedDocument{{"port_src", filter.ClientPort}})
}
if filter.MinDuration > 0 {
query = query.Filter(OrderedDocument{{"$where", fmt.Sprintf("this.closed_at - this.started_at >= %v", filter.MinDuration)}})
}
if filter.MaxDuration > 0 {
query = query.Filter(OrderedDocument{{"$where", fmt.Sprintf("this.closed_at - this.started_at <= %v", filter.MaxDuration)}})
}
if filter.MinBytes > 0 {
query = query.Filter(OrderedDocument{{"$where", fmt.Sprintf("this.client_bytes + this.server_bytes >= %v", filter.MinBytes)}})
}
if filter.MaxBytes > 0 {
query = query.Filter(OrderedDocument{{"$where", fmt.Sprintf("this.client_bytes + this.server_bytes <= %v", filter.MaxBytes)}})
}
if filter.StartedAfter > 0 {
query = query.Filter(OrderedDocument{{"started_at", UnorderedDocument{"$gt": time.Unix(filter.StartedAfter, 0)}}})
}
if filter.StartedBefore > 0 {
query = query.Filter(OrderedDocument{{"started_at", UnorderedDocument{"$lt": time.Unix(filter.StartedBefore, 0)}}})
}
if filter.ClosedAfter > 0 {
query = query.Filter(OrderedDocument{{"closed_at", UnorderedDocument{"$gt": time.Unix(filter.ClosedAfter, 0)}}})
}
if filter.ClosedBefore > 0 {
query = query.Filter(OrderedDocument{{"closed_at", UnorderedDocument{"$lt": time.Unix(filter.ClosedBefore, 0)}}})
}
if filter.Hidden {
query = query.Filter(OrderedDocument{{"hidden", true}})
}
if filter.Marked {
query = query.Filter(OrderedDocument{{"marked", true}})
}
if filter.MatchedRules != nil && len(filter.MatchedRules) > 0 {
matchedRules := make([]RowID, len(filter.MatchedRules))
for i, elem := range filter.MatchedRules {
if id, err := RowIDFromHex(elem); err != nil {
log.WithError(err).WithField("filter", filter).Panic("failed to convert matched_rules ids")
} else {
matchedRules[i] = id
}
}
query = query.Filter(OrderedDocument{{"matched_rules", UnorderedDocument{"$all": matchedRules}}})
}
performedSearchID, _ := RowIDFromHex(filter.PerformedSearch)
if !performedSearchID.IsZero() {
performedSearch := cc.searchController.GetPerformedSearch(performedSearchID)
if !performedSearch.ID.IsZero() && len(performedSearch.AffectedConnections) > 0 {
query = query.Filter(OrderedDocument{{"_id", UnorderedDocument{"$in": performedSearch.AffectedConnections}}})
}
}
if filter.Limit > 0 && filter.Limit <= MaxQueryLimit {
query = query.Limit(filter.Limit)
} else {
query = query.Limit(DefaultQueryLimit)
}
if err := query.All(&connections); err != nil {
log.WithError(err).WithField("filter", filter).Panic("failed to get connections")
}
if connections == nil {
return []Connection{}
}
services := cc.servicesController.GetServices()
for i, connection := range connections {
if service, isPresent := services[connection.DestinationPort]; isPresent {
connections[i].Service = service
}
}
if !to.IsZero() {
connections = reverseConnections(connections)
}
return connections
}
func (cc ConnectionsController) GetConnection(c context.Context, id RowID) (Connection, bool) {
var connection Connection
if err := cc.storage.Find(Connections).Context(c).Filter(byID(id)).First(&connection); err != nil {
log.WithError(err).WithField("id", id).Panic("failed to get connection")
}
return connection, !connection.ID.IsZero()
}
func (cc ConnectionsController) SetHidden(c context.Context, id RowID, hidden bool) bool {
return cc.setProperty(c, id, "hidden", hidden)
}
func (cc ConnectionsController) SetMarked(c context.Context, id RowID, marked bool) bool {
return cc.setProperty(c, id, "marked", marked)
}
func (cc ConnectionsController) SetComment(c context.Context, id RowID, comment string) bool {
return cc.setProperty(c, id, "comment", comment)
}
func (cc ConnectionsController) setProperty(c context.Context, id RowID, propertyName string, propertyValue interface{}) bool {
updated, err := cc.storage.Update(Connections).Context(c).Filter(byID(id)).
One(UnorderedDocument{propertyName: propertyValue})
if err != nil {
log.WithError(err).WithField("id", id).Panic("failed to update a connection property")
}
return updated
}
func reverseConnections(connections []Connection) []Connection {
for i := 0; i < len(connections)/2; i++ {
j := len(connections) - i - 1
connections[i], connections[j] = connections[j], connections[i]
}
return connections
}
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