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Add scoping to IPInfo

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This commit is contained in:
Daniel 2020-10-13 16:05:05 +02:00
parent 86fed20f71
commit 62dd4355be
7 changed files with 155 additions and 106 deletions
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62
firewall/dns.go
View file

@ -205,10 +205,21 @@ func mayBlockCNAMEs(conn *network.Connection) bool {
return false
}
// updateIPsAndCNAMEs saves all the IP->Name mappings to the cache database and
// updates the CNAMEs in the Connection's Entity.
func updateIPsAndCNAMEs(q *resolver.Query, rrCache *resolver.RRCache, conn *network.Connection) {
// save IP addresses to IPInfo
// FIXME: ignore localhost
// Get IPInfo scope.
var scope string
proc := conn.Process()
if proc != nil {
scope = proc.LocalProfileKey
}
// Collect IPs and CNAMEs.
cnames := make(map[string]string)
ips := make(map[string]struct{})
ips := make([]net.IP, 0, len(rrCache.Answer))
for _, rr := range append(rrCache.Answer, rrCache.Extra...) {
switch v := rr.(type) {
@ -216,19 +227,27 @@ func updateIPsAndCNAMEs(q *resolver.Query, rrCache *resolver.RRCache, conn *netw
cnames[v.Hdr.Name] = v.Target
case *dns.A:
ips[v.A.String()] = struct{}{}
ips = append(ips, v.A)
case *dns.AAAA:
ips[v.AAAA.String()] = struct{}{}
ips = append(ips, v.AAAA)
}
}
for ip := range ips {
record := resolver.ResolvedDomain{
Domain: q.FQDN,
// Package IPs and CNAMEs into IPInfo structs.
for _, ip := range ips {
// Never save domain attributions for localhost IPs.
if netutils.ClassifyIP(ip) == netutils.HostLocal {
continue
}
// resolve all CNAMEs in the correct order.
// Create new record for this IP.
record := resolver.ResolvedDomain{
Domain: q.FQDN,
Expires: rrCache.TTL,
}
// Resolve all CNAMEs in the correct order and add the to the record.
var domain = q.FQDN
for {
nextDomain, isCNAME := cnames[domain]
@ -240,31 +259,30 @@ func updateIPsAndCNAMEs(q *resolver.Query, rrCache *resolver.RRCache, conn *netw
domain = nextDomain
}
// update the entity to include the cnames
// Update the entity to include the CNAMEs of the query response.
conn.Entity.CNAME = record.CNAMEs
// get the existing IP info or create a new one
var save bool
info, err := resolver.GetIPInfo(ip)
// Check if there is an existing record for this DNS response.
// Else create a new one.
ipString := ip.String()
info, err := resolver.GetIPInfo(scope, ipString)
if err != nil {
if err != database.ErrNotFound {
log.Errorf("nameserver: failed to search for IP info record: %s", err)
}
info = &resolver.IPInfo{
IP: ip,
IP: ipString,
Scope: scope,
}
save = true
}
// and the new resolved domain record and save
if new := info.AddDomain(record); new {
save = true
}
if save {
if err := info.Save(); err != nil {
log.Errorf("nameserver: failed to save IP info record: %s", err)
}
// Add the new record to the resolved domains for this IP and scope.
info.AddDomain(record)
// Save if the record is new or has been updated.
if err := info.Save(); err != nil {
log.Errorf("nameserver: failed to save IP info record: %s", err)
}
}
}

4
network/connection.go
View file

@ -139,9 +139,9 @@ func NewConnectionFromFirstPacket(pkt packet.Packet) *Connection {
}
// check if we can find a domain for that IP
ipinfo, err := resolver.GetIPInfo(pkt.Info().Dst.String())
ipinfo, err := resolver.GetIPInfo(proc.LocalProfileKey, pkt.Info().Dst.String())
if err == nil {
lastResolvedDomain := ipinfo.ResolvedDomains.MostRecentDomain()
lastResolvedDomain := ipinfo.MostRecentDomain()
if lastResolvedDomain != nil {
scope = lastResolvedDomain.Domain
entity.Domain = lastResolvedDomain.Domain

147
resolver/ipinfo.go
View file

@ -7,12 +7,25 @@ import (
"github.com/safing/portbase/database"
"github.com/safing/portbase/database/record"
"github.com/safing/portbase/utils"
)
const (
IPInfoScopeGlobal = "global"
)
var (
ipInfoDatabase = database.NewInterface(&database.Options{
AlwaysSetRelativateExpiry: 86400, // 24 hours
Local: true,
Internal: true,
// Cache entries because new/updated entries will often be queries soon
// after inserted.
CacheSize: 256,
// We only use the cache database here, so we can delay and batch all our
// writes. Also, no one else accesses these records, so we are fine using
// this.
DelayCachedWrites: "cache",
})
)
@ -25,6 +38,11 @@ type ResolvedDomain struct {
// CNAMEs is a list of CNAMEs that have been resolved for
// Domain.
CNAMEs []string
// Expires holds the timestamp when this entry expires.
// This does not mean that the entry may not be used anymore afterwards,
// but that this is used to calcuate the TTL of the database record.
Expires int64
}
// String returns a string representation of ResolvedDomain including
@ -54,29 +72,17 @@ func (rds ResolvedDomains) String() string {
return strings.Join(domains, " or ")
}
// MostRecentDomain returns the most recent domain.
func (rds ResolvedDomains) MostRecentDomain() *ResolvedDomain {
if len(rds) == 0 {
return nil
}
// TODO(ppacher): we could also do that by using ResolvedAt()
mostRecent := rds[len(rds)-1]
return &mostRecent
}
// IPInfo represents various information about an IP.
type IPInfo struct {
record.Base
sync.Mutex
// IP holds the acutal IP address.
// IP holds the actual IP address.
IP string
// Domains holds a list of domains that have been
// resolved to IP. This field is deprecated and should
// be removed.
// DEPRECATED: remove with alpha.
Domains []string `json:"Domains,omitempty"`
// Scope holds a scope for this IPInfo.
// Usually this would be the Profile ID of the associated process.
Scope string
// ResolvedDomain is a slice of domains that
// have been requested by various applications
@ -84,35 +90,43 @@ type IPInfo struct {
ResolvedDomains ResolvedDomains
}
// AddDomain adds a new resolved domain to ipi.
func (ipi *IPInfo) AddDomain(resolved ResolvedDomain) bool {
for idx, d := range ipi.ResolvedDomains {
if d.Domain == resolved.Domain {
if utils.StringSliceEqual(d.CNAMEs, resolved.CNAMEs) {
return false
}
// AddDomain adds a new resolved domain to IPInfo.
func (info *IPInfo) AddDomain(resolved ResolvedDomain) {
info.Lock()
defer info.Unlock()
// we have a different CNAME chain now, remove the previous
// entry and add it at the end.
ipi.ResolvedDomains = append(ipi.ResolvedDomains[:idx], ipi.ResolvedDomains[idx+1:]...)
ipi.ResolvedDomains = append(ipi.ResolvedDomains, resolved)
return true
// Delete old for the same domain.
for idx, d := range info.ResolvedDomains {
if d.Domain == resolved.Domain {
info.ResolvedDomains = append(info.ResolvedDomains[:idx], info.ResolvedDomains[idx+1:]...)
break
}
}
ipi.ResolvedDomains = append(ipi.ResolvedDomains, resolved)
return true
// Add new entry to the end.
info.ResolvedDomains = append(info.ResolvedDomains, resolved)
}
func makeIPInfoKey(ip string) string {
return fmt.Sprintf("cache:intel/ipInfo/%s", ip)
// MostRecentDomain returns the most recent domain.
func (info *IPInfo) MostRecentDomain() *ResolvedDomain {
info.Lock()
defer info.Unlock()
if len(info.ResolvedDomains) == 0 {
return nil
}
mostRecent := info.ResolvedDomains[len(info.ResolvedDomains)-1]
return &mostRecent
}
func makeIPInfoKey(scope, ip string) string {
return fmt.Sprintf("cache:intel/ipInfo/%s/%s", scope, ip)
}
// GetIPInfo gets an IPInfo record from the database.
func GetIPInfo(ip string) (*IPInfo, error) {
key := makeIPInfoKey(ip)
r, err := ipInfoDatabase.Get(key)
func GetIPInfo(scope, ip string) (*IPInfo, error) {
r, err := ipInfoDatabase.Get(makeIPInfoKey(scope, ip))
if err != nil {
return nil, err
}
@ -126,18 +140,6 @@ func GetIPInfo(ip string) (*IPInfo, error) {
return nil, err
}
// Legacy support,
// DEPRECATED: remove with alpha
if len(new.Domains) > 0 && len(new.ResolvedDomains) == 0 {
for _, d := range new.Domains {
new.ResolvedDomains = append(new.ResolvedDomains, ResolvedDomain{
Domain: d,
// rest is empty...
})
}
new.Domains = nil // clean up so we remove it from the database
}
return new, nil
}
@ -150,27 +152,38 @@ func GetIPInfo(ip string) (*IPInfo, error) {
}
// Save saves the IPInfo record to the database.
func (ipi *IPInfo) Save() error {
ipi.Lock()
if !ipi.KeyIsSet() {
ipi.SetKey(makeIPInfoKey(ipi.IP))
}
ipi.Unlock()
func (info *IPInfo) Save() error {
info.Lock()
// Legacy support
// Ensure we don't write new Domain fields into the
// database.
// DEPRECATED: remove with alpha
if len(ipi.Domains) > 0 {
ipi.Domains = nil
// Set database key if not yet set already.
if !info.KeyIsSet() {
// Default to global scope if scope is unset.
if info.Scope == "" {
info.Scope = IPInfoScopeGlobal
}
info.SetKey(makeIPInfoKey(info.Scope, info.IP))
}
return ipInfoDatabase.Put(ipi)
// Calculate and set cache expiry.
var expires int64 = 86400 // Minimum TTL of one day.
for _, rd := range info.ResolvedDomains {
if rd.Expires > expires {
expires = rd.Expires
}
}
info.UpdateMeta()
expires += 3600 // Add one hour to expiry as a buffer.
info.Meta().SetAbsoluteExpiry(expires)
info.Unlock()
return ipInfoDatabase.Put(info)
}
// FmtDomains returns a string consisting of the domains that have seen to use this IP, joined by " or "
func (ipi *IPInfo) String() string {
ipi.Lock()
defer ipi.Unlock()
return fmt.Sprintf("<IPInfo[%s] %s: %s", ipi.Key(), ipi.IP, ipi.ResolvedDomains.String())
func (info *IPInfo) String() string {
info.Lock()
defer info.Unlock()
return fmt.Sprintf("<IPInfo[%s] %s: %s>", info.Key(), info.IP, info.ResolvedDomains.String())
}

18
resolver/ipinfo_test.go
View file

@ -15,7 +15,7 @@ func TestIPInfo(t *testing.T) {
CNAMEs: []string{"example.com"},
}
ipi := &IPInfo{
info := &IPInfo{
IP: "1.2.3.4",
ResolvedDomains: ResolvedDomains{
example,
@ -27,22 +27,18 @@ func TestIPInfo(t *testing.T) {
Domain: "sub2.example.com",
CNAMEs: []string{"sub1.example.com", "example.com"},
}
added := ipi.AddDomain(sub2Example)
assert.True(t, added)
assert.Equal(t, ResolvedDomains{example, subExample, sub2Example}, ipi.ResolvedDomains)
info.AddDomain(sub2Example)
assert.Equal(t, ResolvedDomains{example, subExample, sub2Example}, info.ResolvedDomains)
// try again, should do nothing now
added = ipi.AddDomain(sub2Example)
assert.False(t, added)
assert.Equal(t, ResolvedDomains{example, subExample, sub2Example}, ipi.ResolvedDomains)
info.AddDomain(sub2Example)
assert.Equal(t, ResolvedDomains{example, subExample, sub2Example}, info.ResolvedDomains)
subOverWrite := ResolvedDomain{
Domain: "sub1.example.com",
CNAMEs: []string{}, // now without CNAMEs
}
added = ipi.AddDomain(subOverWrite)
assert.True(t, added)
assert.Equal(t, ResolvedDomains{example, sub2Example, subOverWrite}, ipi.ResolvedDomains)
info.AddDomain(subOverWrite)
assert.Equal(t, ResolvedDomains{example, sub2Example, subOverWrite}, info.ResolvedDomains)
}

3
resolver/main.go
View file

@ -93,6 +93,9 @@ func start() error {
listenToMDNS,
)
module.StartServiceWorker("name record delayed cache writer", 0, recordDatabase.DelayedCacheWriter)
module.StartServiceWorker("ip info delayed cache writer", 0, ipInfoDatabase.DelayedCacheWriter)
return nil
}

24
resolver/namerecord.go
View file

@ -12,10 +12,24 @@ import (
"github.com/safing/portbase/log"
)
const (
// databaseOvertime defines how much longer than the TTL name records are
// cached in the database.
databaseOvertime = 86400 * 14 // two weeks
)
var (
recordDatabase = database.NewInterface(&database.Options{
AlwaysSetRelativateExpiry: 2592000, // 30 days
CacheSize: 256,
Local: true,
Internal: true,
// Cache entries because application often resolve domains multiple times.
CacheSize: 256,
// We only use the cache database here, so we can delay and batch all our
// writes. Also, no one else accesses these records, so we are fine using
// this.
DelayCachedWrites: "cache",
})
nameRecordsKeyPrefix = "cache:intel/nameRecord/"
@ -32,7 +46,8 @@ type NameRecord struct {
Answer []string
Ns []string
Extra []string
TTL int64
// TODO: Name change in progress. Rename "TTL" field to "Expires" in Q1 2021.
TTL int64 `json:"Expires"`
Server string
ServerScope int8
@ -84,6 +99,9 @@ func (rec *NameRecord) Save() error {
}
rec.SetKey(makeNameRecordKey(rec.Domain, rec.Question))
rec.UpdateMeta()
rec.Meta().SetAbsoluteExpiry(rec.TTL + databaseOvertime)
return recordDatabase.PutNew(rec)
}

3
resolver/rrcache.go
View file

@ -28,7 +28,8 @@ type RRCache struct {
Answer []dns.RR
Ns []dns.RR
Extra []dns.RR
TTL int64
// TODO: Name change in progress. Rename "TTL" field to "Expires" in Q1 2021.
TTL int64 `json:"Expires"`
// Source Information
Server string