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profile-layered.go
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profile-layered.go
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package profile
import (
"context"
"sync"
"sync/atomic"
"github.com/safing/portbase/database/record"
"github.com/safing/portbase/log"
"github.com/safing/portbase/runtime"
"github.com/safing/portmaster/status"
"github.com/safing/portbase/config"
"github.com/safing/portmaster/intel"
"github.com/safing/portmaster/profile/endpoints"
)
// LayeredProfile combines multiple Profiles.
type LayeredProfile struct {
record.Base
sync.RWMutex
localProfile *Profile
layers []*Profile
LayerIDs []string
RevisionCounter uint64
globalValidityFlag *config.ValidityFlag
securityLevel *uint32
// These functions give layered access to configuration options and require
// the layered profile to be read locked.
// TODO(ppacher): we need JSON tags here so the layeredProfile can be exposed
// via the API. If we ever switch away from JSON to something else supported
// by DSD this WILL BREAK!
DisableAutoPermit config.BoolOption `json:"-"`
BlockScopeLocal config.BoolOption `json:"-"`
BlockScopeLAN config.BoolOption `json:"-"`
BlockScopeInternet config.BoolOption `json:"-"`
BlockP2P config.BoolOption `json:"-"`
BlockInbound config.BoolOption `json:"-"`
RemoveOutOfScopeDNS config.BoolOption `json:"-"`
RemoveBlockedDNS config.BoolOption `json:"-"`
FilterSubDomains config.BoolOption `json:"-"`
FilterCNAMEs config.BoolOption `json:"-"`
PreventBypassing config.BoolOption `json:"-"`
DomainHeuristics config.BoolOption `json:"-"`
UseSPN config.BoolOption `json:"-"`
}
// NewLayeredProfile returns a new layered profile based on the given local profile.
func NewLayeredProfile(localProfile *Profile) *LayeredProfile {
var securityLevelVal uint32
new := &LayeredProfile{
localProfile: localProfile,
layers: make([]*Profile, 0, len(localProfile.LinkedProfiles)+1),
LayerIDs: make([]string, 0, len(localProfile.LinkedProfiles)+1),
globalValidityFlag: config.NewValidityFlag(),
RevisionCounter: 1,
securityLevel: &securityLevelVal,
}
new.DisableAutoPermit = new.wrapSecurityLevelOption(
CfgOptionDisableAutoPermitKey,
cfgOptionDisableAutoPermit,
)
new.BlockScopeLocal = new.wrapSecurityLevelOption(
CfgOptionBlockScopeLocalKey,
cfgOptionBlockScopeLocal,
)
new.BlockScopeLAN = new.wrapSecurityLevelOption(
CfgOptionBlockScopeLANKey,
cfgOptionBlockScopeLAN,
)
new.BlockScopeInternet = new.wrapSecurityLevelOption(
CfgOptionBlockScopeInternetKey,
cfgOptionBlockScopeInternet,
)
new.BlockP2P = new.wrapSecurityLevelOption(
CfgOptionBlockP2PKey,
cfgOptionBlockP2P,
)
new.BlockInbound = new.wrapSecurityLevelOption(
CfgOptionBlockInboundKey,
cfgOptionBlockInbound,
)
new.RemoveOutOfScopeDNS = new.wrapSecurityLevelOption(
CfgOptionRemoveOutOfScopeDNSKey,
cfgOptionRemoveOutOfScopeDNS,
)
new.RemoveBlockedDNS = new.wrapSecurityLevelOption(
CfgOptionRemoveBlockedDNSKey,
cfgOptionRemoveBlockedDNS,
)
new.FilterSubDomains = new.wrapSecurityLevelOption(
CfgOptionFilterSubDomainsKey,
cfgOptionFilterSubDomains,
)
new.FilterCNAMEs = new.wrapSecurityLevelOption(
CfgOptionFilterCNAMEKey,
cfgOptionFilterCNAME,
)
new.PreventBypassing = new.wrapSecurityLevelOption(
CfgOptionPreventBypassingKey,
cfgOptionPreventBypassing,
)
new.DomainHeuristics = new.wrapSecurityLevelOption(
CfgOptionDomainHeuristicsKey,
cfgOptionDomainHeuristics,
)
new.UseSPN = new.wrapBoolOption(
CfgOptionUseSPNKey,
cfgOptionUseSPN,
)
new.LayerIDs = append(new.LayerIDs, localProfile.ScopedID())
new.layers = append(new.layers, localProfile)
// TODO: Load additional profiles.
new.updateCaches()
new.CreateMeta()
new.SetKey(runtime.DefaultRegistry.DatabaseName() + ":" + revisionProviderPrefix + localProfile.ScopedID())
// Inform database subscribers about the new layered profile.
new.Lock()
defer new.Unlock()
pushLayeredProfile(new)
return new
}
// LockForUsage locks the layered profile, including all layers individually.
func (lp *LayeredProfile) LockForUsage() {
lp.RLock()
for _, layer := range lp.layers {
layer.RLock()
}
}
// UnlockForUsage unlocks the layered profile, including all layers individually.
func (lp *LayeredProfile) UnlockForUsage() {
lp.RUnlock()
for _, layer := range lp.layers {
layer.RUnlock()
}
}
// LocalProfile returns the local profile associated with this layered profile.
func (lp *LayeredProfile) LocalProfile() *Profile {
if lp == nil {
return nil
}
lp.RLock()
defer lp.RUnlock()
return lp.localProfile
}
// RevisionCnt returns the current profile revision counter.
func (lp *LayeredProfile) RevisionCnt() (revisionCounter uint64) {
if lp == nil {
return 0
}
lp.RLock()
defer lp.RUnlock()
return lp.RevisionCounter
}
// MarkStillActive marks all the layers as still active.
func (lp *LayeredProfile) MarkStillActive() {
if lp == nil {
return
}
lp.RLock()
defer lp.RUnlock()
for _, layer := range lp.layers {
layer.MarkStillActive()
}
}
// NeedsUpdate checks for outdated profiles.
func (lp *LayeredProfile) NeedsUpdate() (outdated bool) {
lp.RLock()
defer lp.RUnlock()
// Check global config state.
if !lp.globalValidityFlag.IsValid() {
return true
}
// Check config in layers.
for _, layer := range lp.layers {
if layer.outdated.IsSet() {
return true
}
}
return false
}
// Update checks for and replaces any outdated profiles.
func (lp *LayeredProfile) Update() (revisionCounter uint64) {
lp.Lock()
defer lp.Unlock()
var changed bool
for i, layer := range lp.layers {
if layer.outdated.IsSet() {
changed = true
// update layer
newLayer, err := GetProfile(layer.Source, layer.ID, layer.LinkedPath)
if err != nil {
log.Errorf("profiles: failed to update profile %s", layer.ScopedID())
} else {
lp.layers[i] = newLayer
}
}
}
if !lp.globalValidityFlag.IsValid() {
changed = true
}
if changed {
// get global config validity flag
lp.globalValidityFlag.Refresh()
// update cached data fields
lp.updateCaches()
// bump revision counter
lp.RevisionCounter++
pushLayeredProfile(lp)
}
return lp.RevisionCounter
}
func (lp *LayeredProfile) updateCaches() {
// update security level
var newLevel uint8
for _, layer := range lp.layers {
if newLevel < layer.SecurityLevel {
newLevel = layer.SecurityLevel
}
}
atomic.StoreUint32(lp.securityLevel, uint32(newLevel))
}
// MarkUsed marks the localProfile as used.
func (lp *LayeredProfile) MarkUsed() {
lp.localProfile.MarkUsed()
}
// SecurityLevel returns the highest security level of all layered profiles. This function is atomic and does not require any locking.
func (lp *LayeredProfile) SecurityLevel() uint8 {
return uint8(atomic.LoadUint32(lp.securityLevel))
}
// DefaultAction returns the active default action ID. This functions requires the layered profile to be read locked.
func (lp *LayeredProfile) DefaultAction() uint8 {
for _, layer := range lp.layers {
if layer.defaultAction > 0 {
return layer.defaultAction
}
}
cfgLock.RLock()
defer cfgLock.RUnlock()
return cfgDefaultAction
}
// MatchEndpoint checks if the given endpoint matches an entry in any of the profiles. This functions requires the layered profile to be read locked.
func (lp *LayeredProfile) MatchEndpoint(ctx context.Context, entity *intel.Entity) (endpoints.EPResult, endpoints.Reason) {
for _, layer := range lp.layers {
if layer.endpoints.IsSet() {
result, reason := layer.endpoints.Match(ctx, entity)
if endpoints.IsDecision(result) {
return result, reason
}
}
}
cfgLock.RLock()
defer cfgLock.RUnlock()
return cfgEndpoints.Match(ctx, entity)
}
// MatchServiceEndpoint checks if the given endpoint of an inbound connection matches an entry in any of the profiles. This functions requires the layered profile to be read locked.
func (lp *LayeredProfile) MatchServiceEndpoint(ctx context.Context, entity *intel.Entity) (endpoints.EPResult, endpoints.Reason) {
entity.EnableReverseResolving()
for _, layer := range lp.layers {
if layer.serviceEndpoints.IsSet() {
result, reason := layer.serviceEndpoints.Match(ctx, entity)
if endpoints.IsDecision(result) {
return result, reason
}
}
}
cfgLock.RLock()
defer cfgLock.RUnlock()
return cfgServiceEndpoints.Match(ctx, entity)
}
// MatchFilterLists matches the entity against the set of filter
// lists. This functions requires the layered profile to be read locked.
func (lp *LayeredProfile) MatchFilterLists(ctx context.Context, entity *intel.Entity) (endpoints.EPResult, endpoints.Reason) {
entity.ResolveSubDomainLists(ctx, lp.FilterSubDomains())
entity.EnableCNAMECheck(ctx, lp.FilterCNAMEs())
for _, layer := range lp.layers {
// Search for the first layer that has filter lists set.
if layer.filterListsSet {
entity.LoadLists(ctx)
if entity.MatchLists(layer.filterListIDs) {
return endpoints.Denied, entity.ListBlockReason()
}
return endpoints.NoMatch, nil
}
}
cfgLock.RLock()
defer cfgLock.RUnlock()
if len(cfgFilterLists) > 0 {
entity.LoadLists(ctx)
if entity.MatchLists(cfgFilterLists) {
return endpoints.Denied, entity.ListBlockReason()
}
}
return endpoints.NoMatch, nil
}
func (lp *LayeredProfile) wrapSecurityLevelOption(configKey string, globalConfig config.IntOption) config.BoolOption {
activeAtLevels := lp.wrapIntOption(configKey, globalConfig)
return func() bool {
return uint8(activeAtLevels())&max(
lp.SecurityLevel(), // layered profile security level
status.ActiveSecurityLevel(), // global security level
) > 0
}
}
func (lp *LayeredProfile) wrapBoolOption(configKey string, globalConfig config.BoolOption) config.BoolOption {
var revCnt uint64 = 0
var value bool
var refreshLock sync.Mutex
return func() bool {
refreshLock.Lock()
defer refreshLock.Unlock()
// Check if we need to refresh the value.
if revCnt != lp.RevisionCounter {
revCnt = lp.RevisionCounter
// Go through all layers to find an active value.
found := false
for _, layer := range lp.layers {
layerValue, ok := layer.configPerspective.GetAsBool(configKey)
if ok {
found = true
value = layerValue
break
}
}
if !found {
value = globalConfig()
}
}
return value
}
}
func (lp *LayeredProfile) wrapIntOption(configKey string, globalConfig config.IntOption) config.IntOption {
var revCnt uint64 = 0
var value int64
var refreshLock sync.Mutex
return func() int64 {
refreshLock.Lock()
defer refreshLock.Unlock()
// Check if we need to refresh the value.
if revCnt != lp.RevisionCounter {
revCnt = lp.RevisionCounter
// Go through all layers to find an active value.
found := false
for _, layer := range lp.layers {
layerValue, ok := layer.configPerspective.GetAsInt(configKey)
if ok {
found = true
value = layerValue
break
}
}
if !found {
value = globalConfig()
}
}
return value
}
}
// GetProfileSource returns the database key of the first profile in the
// layers that has the given configuration key set. If it returns an empty
// string, the global profile can be assumed to have been effective.
func (lp *LayeredProfile) GetProfileSource(configKey string) string {
for _, layer := range lp.layers {
if layer.configPerspective.Has(configKey) {
return layer.Key()
}
}
// Global Profile
return ""
}
/*
For later:
func (lp *LayeredProfile) wrapStringOption(configKey string, globalConfig config.StringOption) config.StringOption {
var revCnt uint64 = 0
var value string
var refreshLock sync.Mutex
return func() string {
refreshLock.Lock()
defer refreshLock.Unlock()
// Check if we need to refresh the value.
if revCnt != lp.RevisionCounter {
revCnt = lp.RevisionCounter
// Go through all layers to find an active value.
found := false
for _, layer := range lp.layers {
layerValue, ok := layer.configPerspective.GetAsString(configKey)
if ok {
found = true
value = layerValue
break
}
}
if !found {
value = globalConfig()
}
}
return value
}
}
*/
func max(a, b uint8) uint8 {
if a > b {
return a
}
return b
}