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entity.go
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entity.go
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package intel
import (
"context"
"fmt"
"net"
"sort"
"strings"
"sync"
"github.com/safing/portbase/log"
"github.com/safing/portmaster/intel/filterlists"
"github.com/safing/portmaster/intel/geoip"
"github.com/safing/portmaster/network/netutils"
"github.com/safing/portmaster/status"
"golang.org/x/net/publicsuffix"
)
// Entity describes a remote endpoint in many different ways.
// It embeddes a sync.Mutex but none of the endpoints own
// functions performs locking. The caller MUST ENSURE
// proper locking and synchronization when accessing
// any properties of Entity.
type Entity struct {
sync.Mutex
// lists exist for most entity information and
// we need to know which one we loaded
domainListLoaded bool
ipListLoaded bool
countryListLoaded bool
asnListLoaded bool
reverseResolveEnabled bool
resolveSubDomainLists bool
checkCNAMEs bool
// Protocol is the protcol number used by the connection.
Protocol uint8
// Port is the destination port of the connection
Port uint16
// Domain is the target domain of the connection.
Domain string
// CNAME is a list of domain names that have been
// resolved for Domain.
CNAME []string
// IP is the IP address of the connection. If domain is
// set, IP has been resolved by following all CNAMEs.
IP net.IP
// Country holds the country the IP address (ASN) is
// located in.
Country string
// ASN holds the autonomous system number of the IP.
ASN uint
location *geoip.Location
// BlockedByLists holds list source IDs that
// are used to block the entity.
BlockedByLists []string
// BlockedEntities holds a list of entities that
// have been blocked. Values can be used as a key
// for the ListOccurences map.
BlockedEntities []string
// ListOccurences is a map that matches an entity (Domain, IPs, ASN, Country, Sub-domain)
// to a list of sources where the entity has been observed in.
ListOccurences map[string][]string
// we only load each data above at most once
fetchLocationOnce sync.Once
reverseResolveOnce sync.Once
loadDomainListOnce sync.Once
loadIPListOnce sync.Once
loadCoutryListOnce sync.Once
loadAsnListOnce sync.Once
}
// Init initializes the internal state and returns the entity.
func (e *Entity) Init() *Entity {
// for backwards compatibility, remove that one
return e
}
// FetchData fetches additional information, meant to be called before persisting an entity record.
func (e *Entity) FetchData() {
e.getLocation()
e.getLists()
}
// ResetLists resets the current list data and forces
// all list sources to be re-acquired when calling GetLists().
func (e *Entity) ResetLists() {
// TODO(ppacher): our actual goal is to reset the domain
// list right now so we could be more efficient by keeping
// the other lists around.
e.BlockedByLists = nil
e.BlockedEntities = nil
e.ListOccurences = nil
e.domainListLoaded = false
e.ipListLoaded = false
e.countryListLoaded = false
e.asnListLoaded = false
e.resolveSubDomainLists = false
e.checkCNAMEs = false
e.loadDomainListOnce = sync.Once{}
e.loadIPListOnce = sync.Once{}
e.loadCoutryListOnce = sync.Once{}
e.loadAsnListOnce = sync.Once{}
}
// ResolveSubDomainLists enables or disables list lookups for
// sub-domains.
func (e *Entity) ResolveSubDomainLists(enabled bool) {
if e.domainListLoaded {
log.Warningf("intel/filterlists: tried to change sub-domain resolving for %s but lists are already fetched", e.Domain)
}
e.resolveSubDomainLists = enabled
}
// EnableCNAMECheck enalbes or disables list lookups for
// entity CNAMEs.
func (e *Entity) EnableCNAMECheck(enabled bool) {
if e.domainListLoaded {
log.Warningf("intel/filterlists: tried to change CNAME resolving for %s but lists are already fetched", e.Domain)
}
e.checkCNAMEs = enabled
}
// CNAMECheckEnabled returns true if the entities CNAMEs should
// also be checked.
func (e *Entity) CNAMECheckEnabled() bool {
return e.checkCNAMEs
}
// Domain and IP
// EnableReverseResolving enables reverse resolving the domain from the IP on demand.
func (e *Entity) EnableReverseResolving() {
e.reverseResolveEnabled = true
}
func (e *Entity) reverseResolve() {
e.reverseResolveOnce.Do(func() {
// check if we should resolve
if !e.reverseResolveEnabled {
return
}
// need IP!
if e.IP == nil {
return
}
// reverse resolve
if reverseResolver == nil {
return
}
// TODO: security level
domain, err := reverseResolver(context.TODO(), e.IP.String(), status.SecurityLevelNormal)
if err != nil {
log.Warningf("intel: failed to resolve IP %s: %s", e.IP, err)
return
}
e.Domain = domain
})
}
// GetDomain returns the domain and whether it is set.
func (e *Entity) GetDomain() (string, bool) {
e.reverseResolve()
if e.Domain == "" {
return "", false
}
return e.Domain, true
}
// GetIP returns the IP and whether it is set.
func (e *Entity) GetIP() (net.IP, bool) {
if e.IP == nil {
return nil, false
}
return e.IP, true
}
// Location
func (e *Entity) getLocation() {
e.fetchLocationOnce.Do(func() {
// need IP!
if e.IP == nil {
return
}
// get location data
loc, err := geoip.GetLocation(e.IP)
if err != nil {
log.Warningf("intel: failed to get location data for %s: %s", e.IP, err)
return
}
e.location = loc
e.Country = loc.Country.ISOCode
e.ASN = loc.AutonomousSystemNumber
})
}
// GetLocation returns the raw location data and whether it is set.
func (e *Entity) GetLocation() (*geoip.Location, bool) {
e.getLocation()
if e.location == nil {
return nil, false
}
return e.location, true
}
// GetCountry returns the two letter ISO country code and whether it is set.
func (e *Entity) GetCountry() (string, bool) {
e.getLocation()
if e.Country == "" {
return "", false
}
return e.Country, true
}
// GetASN returns the AS number and whether it is set.
func (e *Entity) GetASN() (uint, bool) {
e.getLocation()
if e.ASN == 0 {
return 0, false
}
return e.ASN, true
}
// Lists
func (e *Entity) getLists() {
e.getDomainLists()
e.getASNLists()
e.getIPLists()
e.getCountryLists()
}
func (e *Entity) mergeList(key string, list []string) {
if len(list) == 0 {
return
}
if e.ListOccurences == nil {
e.ListOccurences = make(map[string][]string)
}
e.ListOccurences[key] = mergeStringList(e.ListOccurences[key], list)
}
func (e *Entity) getDomainLists() {
if e.domainListLoaded {
return
}
domain, ok := e.GetDomain()
if !ok {
return
}
e.loadDomainListOnce.Do(func() {
var domainsToInspect = []string{domain}
if e.checkCNAMEs {
log.Tracef("intel: CNAME filtering enabled, checking %v too", e.CNAME)
domainsToInspect = append(domainsToInspect, e.CNAME...)
}
var domains []string
if e.resolveSubDomainLists {
for _, domain := range domainsToInspect {
subdomains := splitDomain(domain)
domains = append(domains, subdomains...)
}
} else {
domains = domainsToInspect
}
domains = makeDistinct(domains)
for _, d := range domains {
log.Tracef("intel: loading domain list for %s", d)
list, err := filterlists.LookupDomain(d)
if err != nil {
log.Errorf("intel: failed to get domain blocklists for %s: %s", d, err)
e.loadDomainListOnce = sync.Once{}
return
}
e.mergeList(d, list)
}
e.domainListLoaded = true
})
}
func splitDomain(domain string) []string {
domain = strings.Trim(domain, ".")
suffix, _ := publicsuffix.PublicSuffix(domain)
if suffix == domain {
return []string{domain}
}
domainWithoutSuffix := domain[:len(domain)-len(suffix)]
domainWithoutSuffix = strings.Trim(domainWithoutSuffix, ".")
splitted := strings.FieldsFunc(domainWithoutSuffix, func(r rune) bool {
return r == '.'
})
domains := make([]string, 0, len(splitted))
for idx := range splitted {
d := strings.Join(splitted[idx:], ".") + "." + suffix
if d[len(d)-1] != '.' {
d += "."
}
domains = append(domains, d)
}
return domains
}
func (e *Entity) getASNLists() {
if e.asnListLoaded {
return
}
asn, ok := e.GetASN()
if !ok {
return
}
log.Tracef("intel: loading ASN list for %d", asn)
e.loadAsnListOnce.Do(func() {
asnStr := fmt.Sprintf("%d", asn)
list, err := filterlists.LookupASNString(asnStr)
if err != nil {
log.Errorf("intel: failed to get ASN blocklist for %d: %s", asn, err)
e.loadAsnListOnce = sync.Once{}
return
}
e.asnListLoaded = true
e.mergeList(asnStr, list)
})
}
func (e *Entity) getCountryLists() {
if e.countryListLoaded {
return
}
country, ok := e.GetCountry()
if !ok {
return
}
log.Tracef("intel: loading country list for %s", country)
e.loadCoutryListOnce.Do(func() {
list, err := filterlists.LookupCountry(country)
if err != nil {
log.Errorf("intel: failed to load country blocklist for %s: %s", country, err)
e.loadCoutryListOnce = sync.Once{}
return
}
e.countryListLoaded = true
e.mergeList(country, list)
})
}
func (e *Entity) getIPLists() {
if e.ipListLoaded {
return
}
ip, ok := e.GetIP()
if !ok {
return
}
if ip == nil {
return
}
// only load lists for IP addresses that are classified as global.
if netutils.ClassifyIP(ip) != netutils.Global {
return
}
log.Tracef("intel: loading IP list for %s", ip)
e.loadIPListOnce.Do(func() {
list, err := filterlists.LookupIP(ip)
if err != nil {
log.Errorf("intel: failed to get IP blocklist for %s: %s", ip.String(), err)
e.loadIPListOnce = sync.Once{}
return
}
e.ipListLoaded = true
e.mergeList(ip.String(), list)
})
}
// LoadLists searches all filterlists for all occurrences of
// this entity.
func (e *Entity) LoadLists() bool {
e.getLists()
return e.ListOccurences != nil
}
// MatchLists matches the entities lists against a slice
// of source IDs and updates various entity properties
// like BlockedByLists, ListOccurences and BlockedEntitites.
func (e *Entity) MatchLists(lists []string) bool {
e.BlockedByLists = nil
e.BlockedEntities = nil
lm := makeMap(lists)
for key, keyLists := range e.ListOccurences {
for _, keyListID := range keyLists {
if _, ok := lm[keyListID]; ok {
e.BlockedByLists = append(e.BlockedByLists, keyListID)
e.BlockedEntities = append(e.BlockedEntities, key)
}
}
}
e.BlockedByLists = makeDistinct(e.BlockedByLists)
e.BlockedEntities = makeDistinct(e.BlockedEntities)
return len(e.BlockedByLists) > 0
}
// ListBlockReason returns the block reason for this entity.
func (e *Entity) ListBlockReason() ListBlockReason {
blockedBy := make([]ListMatch, len(e.BlockedEntities))
lm := makeMap(e.BlockedByLists)
for idx, blockedEntity := range e.BlockedEntities {
if entityLists, ok := e.ListOccurences[blockedEntity]; ok {
var activeLists []string
var inactiveLists []string
for _, l := range entityLists {
if _, ok := lm[l]; ok {
activeLists = append(activeLists, l)
} else {
inactiveLists = append(inactiveLists, l)
}
}
blockedBy[idx] = ListMatch{
Entity: blockedEntity,
ActiveLists: activeLists,
InactiveLists: inactiveLists,
}
}
}
return blockedBy
}
func mergeStringList(a, b []string) []string {
listMap := make(map[string]struct{})
for _, s := range a {
listMap[s] = struct{}{}
}
for _, s := range b {
listMap[s] = struct{}{}
}
res := make([]string, 0, len(listMap))
for s := range listMap {
res = append(res, s)
}
sort.Strings(res)
return res
}
func makeDistinct(slice []string) []string {
m := make(map[string]struct{}, len(slice))
result := make([]string, 0, len(slice))
for _, v := range slice {
if _, ok := m[v]; ok {
continue
}
m[v] = struct{}{}
result = append(result, v)
}
return result
}
func makeMap(slice []string) map[string]struct{} {
lm := make(map[string]struct{})
for _, v := range slice {
lm[v] = struct{}{}
}
return lm
}