Finalize profile merging, add profile metadata state handling, re-attribute connections after profile deletion

firewall/module.go

@@ -2,13 +2,18 @@ package firewall
 
 import (
 	"context"
+	"fmt"
+	"strings"
 
+	"github.com/safing/portbase/config"
 	"github.com/safing/portbase/log"
 	"github.com/safing/portbase/modules"
 	"github.com/safing/portbase/modules/subsystems"
 	_ "github.com/safing/portmaster/core"
 	"github.com/safing/portmaster/network"
+	"github.com/safing/portmaster/profile"
 	"github.com/safing/spn/access"
+	"github.com/safing/spn/captain"
 )
 
 var module *modules.Module
@@ -25,12 +30,6 @@ func init() {
 	)
 }
 
-const (
-	configChangeEvent        = "config change"
-	profileConfigChangeEvent = "profile config change"
-	onSPNConnectEvent        = "spn connect"
-)
-
 func prep() error {
 	network.SetDefaultFirewallHandler(verdictHandler)
 
@@ -38,8 +37,8 @@ func prep() error {
 	// this will be triggered on spn enable/disable
 	err := module.RegisterEventHook(
 		"config",
-		configChangeEvent,
+		config.ChangeEvent,
-		"reset connection verdicts",
+		"reset connection verdicts after global config change",
 		func(ctx context.Context, _ interface{}) error {
 			resetAllConnectionVerdicts()
 			return nil
@@ -52,10 +51,20 @@ func prep() error {
 	// Reset connections every time profile changes
 	err = module.RegisterEventHook(
 		"profiles",
-		profileConfigChangeEvent,
+		profile.ConfigChangeEvent,
-		"reset connection verdicts",
+		"reset connection verdicts after profile config change",
-		func(ctx context.Context, _ interface{}) error {
+		func(ctx context.Context, eventData interface{}) error {
-			resetAllConnectionVerdicts()
+			// Expected event data: scoped profile ID.
+			profileID, ok := eventData.(string)
+			if !ok {
+				return fmt.Errorf("event data is not a string: %v", eventData)
+			}
+			profileSource, profileID, ok := strings.Cut(profileID, "/")
+			if !ok {
+				return fmt.Errorf("event data does not seem to be a scoped profile ID: %v", eventData)
+			}
+
+			resetProfileConnectionVerdict(profileSource, profileID)
 			return nil
 		},
 	)
@@ -67,8 +76,8 @@ func prep() error {
 	// connect and disconnecting is triggered on config change event but connecting takеs more time
 	err = module.RegisterEventHook(
 		"captain",
-		onSPNConnectEvent,
+		captain.SPNConnectedEvent,
-		"reset connection verdicts",
+		"reset connection verdicts on SPN connect",
 		func(ctx context.Context, _ interface{}) error {
 			resetAllConnectionVerdicts()
 			return nil
@@ -83,7 +92,7 @@ func prep() error {
 	err = module.RegisterEventHook(
 		"access",
 		access.AccountUpdateEvent,
-		"update connection feature flags",
+		"update connection feature flags after account update",
 		func(ctx context.Context, _ interface{}) error {
 			resetAllConnectionVerdicts()
 			return nil
@@ -93,6 +102,24 @@ func prep() error {
 		log.Errorf("filter: failed to register event hook: %s", err)
 	}
 
+	err = module.RegisterEventHook(
+		"network",
+		network.ConnectionReattributedEvent,
+		"reset verdict of re-attributed connection",
+		func(ctx context.Context, eventData interface{}) error {
+			// Expected event data: connection ID.
+			connID, ok := eventData.(string)
+			if !ok {
+				return fmt.Errorf("event data is not a string: %v", eventData)
+			}
+			resetSingleConnectionVerdict(connID)
+			return nil
+		},
+	)
+	if err != nil {
+		log.Errorf("filter: failed to register event hook: %s", err)
+	}
+
 	if err := registerConfig(); err != nil {
 		return err
 	}

firewall/packet_handler.go

@@ -43,13 +43,55 @@ var (
 	ownPID = os.Getpid()
 )
 
-func resetAllConnectionVerdicts() {
+func resetSingleConnectionVerdict(connID string) {
-	// Resetting will force all the connection to be evaluated by the firewall again
-	// this will set new verdicts if configuration was update or spn has been disabled or enabled.
-	log.Info("interception: re-evaluating all connections")
-
 	// Create tracing context.
 	ctx, tracer := log.AddTracer(context.Background())
+	defer tracer.Submit()
+
+	conn, ok := network.GetConnection(connID)
+	if !ok {
+		conn, ok = network.GetDNSConnection(connID)
+		if !ok {
+			tracer.Debugf("filter: could not find re-attributed connection %s for re-evaluation", connID)
+			return
+		}
+	}
+
+	resetConnectionVerdict(ctx, conn)
+}
+
+func resetProfileConnectionVerdict(profileSource, profileID string) {
+	// Create tracing context.
+	ctx, tracer := log.AddTracer(context.Background())
+	defer tracer.Submit()
+
+	// Resetting will force all the connection to be evaluated by the firewall again
+	// this will set new verdicts if configuration was update or spn has been disabled or enabled.
+	tracer.Infof("filter: re-evaluating connections of %s/%s", profileSource, profileID)
+
+	// Re-evaluate all connections.
+	var changedVerdicts int
+	for _, conn := range network.GetAllConnections() {
+		// Check if connection is complete and attributed to the deleted profile.
+		if conn.DataIsComplete() &&
+			conn.ProcessContext.Profile == profileID &&
+			conn.ProcessContext.Source == profileSource {
+			if resetConnectionVerdict(ctx, conn) {
+				changedVerdicts++
+			}
+		}
+	}
+	tracer.Infof("filter: changed verdict on %d connections", changedVerdicts)
+}
+
+func resetAllConnectionVerdicts() {
+	// Create tracing context.
+	ctx, tracer := log.AddTracer(context.Background())
+	defer tracer.Submit()
+
+	// Resetting will force all the connection to be evaluated by the firewall again
+	// this will set new verdicts if configuration was update or spn has been disabled or enabled.
+	tracer.Info("filter: re-evaluating all connections")
 
 	// Re-evaluate all connections.
 	var changedVerdicts int
@@ -59,13 +101,22 @@ func resetAllConnectionVerdicts() {
 			continue
 		}
 
-		func() {
+		if resetConnectionVerdict(ctx, conn) {
+			changedVerdicts++
+		}
+	}
+	tracer.Infof("filter: changed verdict on %d connections", changedVerdicts)
+}
+
+func resetConnectionVerdict(ctx context.Context, conn *network.Connection) (verdictChanged bool) {
+	tracer := log.Tracer(ctx)
+
 	conn.Lock()
 	defer conn.Unlock()
 
 	// Update feature flags.
 	if err := conn.UpdateFeatures(); err != nil && !errors.Is(err, access.ErrNotLoggedIn) {
-				tracer.Warningf("network: failed to update connection feature flags: %s", err)
+		tracer.Warningf("filter: failed to update connection feature flags: %s", err)
 	}
 
 	// Skip internal connections:
@@ -73,8 +124,8 @@ func resetAllConnectionVerdicts() {
 	// - Redirected DNS requests
 	// - SPN Uplink to Home Hub
 	if conn.Internal {
-				tracer.Tracef("filter: skipping internal connection %s", conn)
+		// tracer.Tracef("filter: skipping internal connection %s", conn)
-				return
+		return false
 	}
 
 	tracer.Debugf("filter: re-evaluating verdict of %s", conn)
@@ -99,14 +150,11 @@ func resetAllConnectionVerdicts() {
 		}
 		conn.Save()
 		tracer.Infof("filter: verdict of connection %s changed from %s to %s", conn, previousVerdict.Verb(), conn.VerdictVerb())
-				changedVerdicts++
+		return true
-			} else {
+	}
+
 	tracer.Tracef("filter: verdict to connection %s unchanged at %s", conn, conn.VerdictVerb())
-			}
+	return false
-		}()
-	}
-	tracer.Infof("filter: changed verdict on %d connections", changedVerdicts)
-	tracer.Submit()
 }
 
 // SetNameserverIPMatcher sets a function that is used to match the internal

network/connection.go

@@ -582,6 +582,11 @@ func GetAllConnections() []*Connection {
 	return conns.list()
 }
 
+// GetDNSConnection fetches a DNS Connection from the database.
+func GetDNSConnection(dnsConnID string) (*Connection, bool) {
+	return dnsConns.get(dnsConnID)
+}
+
 // SetLocalIP sets the local IP address together with its network scope. The
 // connection is not locked for this.
 func (conn *Connection) SetLocalIP(ip net.IP) {

network/module.go

@@ -1,9 +1,16 @@
 package network
 
 import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+
+	"github.com/safing/portbase/log"
 	"github.com/safing/portbase/modules"
 	"github.com/safing/portmaster/netenv"
 	"github.com/safing/portmaster/network/state"
+	"github.com/safing/portmaster/profile"
 )
 
 var (
@@ -12,8 +19,14 @@ var (
 	defaultFirewallHandler FirewallHandler
 )
 
+// Events.
+var (
+	ConnectionReattributedEvent = "connection re-attributed"
+)
+
 func init() {
 	module = modules.Register("network", prep, start, nil, "base", "netenv", "processes")
+	module.RegisterEvent(ConnectionReattributedEvent, false)
 }
 
 // SetDefaultFirewallHandler sets the default firewall handler.
@@ -45,5 +58,95 @@ func start() error {
 	module.StartServiceWorker("clean connections", 0, connectionCleaner)
 	module.StartServiceWorker("write open dns requests", 0, openDNSRequestWriter)
 
+	if err := module.RegisterEventHook(
+		"profiles",
+		profile.DeletedEvent,
+		"re-attribute connections from deleted profile",
+		reAttributeConnections,
+	); err != nil {
+		return err
+	}
+
 	return nil
 }
+
+var reAttributionLock sync.Mutex
+
+// reAttributeConnections finds all connections of a deleted profile and re-attributes them.
+// Expected event data: scoped profile ID.
+func reAttributeConnections(_ context.Context, eventData any) error {
+	profileID, ok := eventData.(string)
+	if !ok {
+		return fmt.Errorf("event data is not a string: %v", eventData)
+	}
+	profileSource, profileID, ok := strings.Cut(profileID, "/")
+	if !ok {
+		return fmt.Errorf("event data does not seem to be a scoped profile ID: %v", eventData)
+	}
+
+	// Hold a lock for re-attribution, to prevent simultaneous processing of the
+	// same connections and make logging cleaner.
+	reAttributionLock.Lock()
+	defer reAttributionLock.Unlock()
+
+	// Create tracing context.
+	ctx, tracer := log.AddTracer(context.Background())
+	defer tracer.Submit()
+	tracer.Infof("network: re-attributing connections from deleted profile %s/%s", profileSource, profileID)
+
+	// Count and log how many connections were re-attributed.
+	var reAttributed int
+
+	// Re-attribute connections.
+	for _, conn := range conns.clone() {
+		// Check if connection is complete and attributed to the deleted profile.
+		if conn.DataIsComplete() &&
+			conn.ProcessContext.Profile == profileID &&
+			conn.ProcessContext.Source == profileSource {
+
+			reAttributeConnection(ctx, conn)
+			reAttributed++
+			tracer.Debugf("filter: re-attributed %s to %s", conn, conn.process.PrimaryProfileID)
+		}
+	}
+
+	// Re-attribute dns connections.
+	for _, conn := range dnsConns.clone() {
+		// Check if connection is complete and attributed to the deleted profile.
+		if conn.DataIsComplete() &&
+			conn.ProcessContext.Profile == profileID &&
+			conn.ProcessContext.Source == profileSource {
+
+			reAttributeConnection(ctx, conn)
+			reAttributed++
+			tracer.Debugf("filter: re-attributed %s to %s", conn, conn.process.PrimaryProfileID)
+		}
+	}
+
+	tracer.Infof("filter: re-attributed %d connections", reAttributed)
+	return nil
+}
+
+func reAttributeConnection(ctx context.Context, conn *Connection) {
+	// Check if data is complete.
+	if !conn.DataIsComplete() {
+		return
+	}
+
+	conn.Lock()
+	defer conn.Unlock()
+
+	// Attempt to assign new profile.
+	err := conn.process.RefetchProfile(ctx)
+	if err != nil {
+		log.Warningf("network: failed to refetch profile for %s: %s", conn, err)
+		return
+	}
+
+	// Set the new process context.
+	conn.ProcessContext = getProcessContext(ctx, conn.process)
+	conn.Save()
+
+	// Trigger event for re-attribution.
+	module.TriggerEvent(ConnectionReattributedEvent, conn.ID)
+}

process/profile.go

@@ -40,6 +40,24 @@ func (p *Process) GetProfile(ctx context.Context) (changed bool, err error) {
 	return true, nil
 }
 
+// RefetchProfile removes the profile and finds and assigns a new profile.
+func (p *Process) RefetchProfile(ctx context.Context) error {
+	p.Lock()
+	defer p.Unlock()
+
+	// Get special or regular profile.
+	localProfile, err := profile.GetLocalProfile(p.getSpecialProfileID(), p.MatchingData(), p.CreateProfileCallback)
+	if err != nil {
+		return fmt.Errorf("failed to find profile: %w", err)
+	}
+
+	// Assign profile to process.
+	p.PrimaryProfileID = localProfile.ScopedID()
+	p.profile = localProfile.LayeredProfile()
+
+	return nil
+}
+
 // getSpecialProfileID returns the special profile ID for the process, if any.
 func (p *Process) getSpecialProfileID() (specialProfileID string) {
 	// Check if we need a special profile.

profile/api.go

@@ -0,0 +1,66 @@
+package profile
+
+import (
+	"fmt"
+
+	"github.com/safing/portbase/api"
+	"github.com/safing/portbase/formats/dsd"
+)
+
+func registerAPIEndpoints() error {
+	if err := api.RegisterEndpoint(api.Endpoint{
+		Name:        "Merge profiles",
+		Description: "Merge multiple profiles into a new one.",
+		Path:        "profile/merge",
+		Write:       api.PermitUser,
+		BelongsTo:   module,
+		StructFunc:  handleMergeProfiles,
+	}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type mergeProfilesRequest struct {
+	Name string   `json:"name"` // Name of the new merged profile.
+	To   string   `json:"to"`   // Profile scoped ID.
+	From []string `json:"from"` // Profile scoped IDs.
+}
+
+type mergeprofilesResponse struct {
+	New string `json:"new"` // Profile scoped ID.
+}
+
+func handleMergeProfiles(ar *api.Request) (i interface{}, err error) {
+	request := &mergeProfilesRequest{}
+	_, err = dsd.MimeLoad(ar.InputData, ar.Header.Get("Content-Type"), request)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse request: %w", err)
+	}
+
+	// Get all profiles.
+	var (
+		primary     *Profile
+		secondaries = make([]*Profile, 0, len(request.From))
+	)
+	if primary, err = getProfile(request.To); err != nil {
+		return nil, fmt.Errorf("failed to get profile %s: %w", request.To, err)
+	}
+	for _, from := range request.From {
+		sp, err := getProfile(from)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get profile %s: %w", request.To, err)
+		}
+		secondaries = append(secondaries, sp)
+	}
+
+	newProfile, err := MergeProfiles(request.Name, primary, secondaries...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to merge profiles: %w", err)
+	}
+
+	return &mergeprofilesResponse{
+		New: newProfile.ScopedID(),
+	}, nil
+}

profile/database.go

@@ -16,6 +16,7 @@ import (
 // core:profiles/<scope>/<id>
 // cache:profiles/index/<identifier>/<value>
 
+// ProfilesDBPath is the base database path for profiles.
 const ProfilesDBPath = "core:profiles/"
 
 var profileDB = database.NewInterface(&database.Options{
@@ -59,8 +60,14 @@ func startProfileUpdateChecker() error {
 				}
 
 				// Get active profile.
-				activeProfile := getActiveProfile(strings.TrimPrefix(r.Key(), ProfilesDBPath))
+				scopedID := strings.TrimPrefix(r.Key(), ProfilesDBPath)
+				activeProfile := getActiveProfile(scopedID)
 				if activeProfile == nil {
+					// Check if profile is being deleted.
+					if r.Meta().IsDeleted() {
+						meta.MarkDeleted(scopedID)
+					}
+
 					// Don't do any additional actions if the profile is not active.
 					continue profileFeed
 				}
@@ -74,7 +81,9 @@ func startProfileUpdateChecker() error {
 				// Always mark as outdated if the record is being deleted.
 				if r.Meta().IsDeleted() {
 					activeProfile.outdated.Set()
-					module.TriggerEvent(profileConfigChange, nil)
+
+					meta.MarkDeleted(scopedID)
+					module.TriggerEvent(DeletedEvent, scopedID)
 					continue
 				}
 
@@ -83,7 +92,7 @@ func startProfileUpdateChecker() error {
 				receivedProfile, err := EnsureProfile(r)
 				if err != nil || !receivedProfile.savedInternally {
 					activeProfile.outdated.Set()
-					module.TriggerEvent(profileConfigChange, nil)
+					module.TriggerEvent(ConfigChangeEvent, scopedID)
 				}
 			case <-ctx.Done():
 				return nil
@@ -105,6 +114,11 @@ func (h *databaseHook) UsesPrePut() bool {
 
 // PrePut implements the Hook interface.
 func (h *databaseHook) PrePut(r record.Record) (record.Record, error) {
+	// Do not intervene with metadata key.
+	if r.Key() == profilesMetadataKey {
+		return r, nil
+	}
+
 	// convert
 	profile, err := EnsureProfile(r)
 	if err != nil {

profile/endpoints/endpoint.go

@@ -202,7 +202,8 @@ func invalidDefinitionError(fields []string, msg string) error {
 	return fmt.Errorf(`invalid endpoint definition: "%s" - %s`, strings.Join(fields, " "), msg)
 }
 
-func parseEndpoint(value string) (endpoint Endpoint, err error) { //nolint:gocognit
+//nolint:gocognit,nakedret
+func parseEndpoint(value string) (endpoint Endpoint, err error) {
 	fields := strings.Fields(value)
 	if len(fields) < 2 {
 		return nil, fmt.Errorf(`invalid endpoint definition: "%s"`, value)

profile/get.go

@@ -287,6 +287,9 @@ func loadProfile(r record.Record) (*Profile, error) {
 	// Set saved internally to suppress outdating profiles if saving internally.
 	profile.savedInternally = true
 
+	// Mark as recently seen.
+	meta.UpdateLastSeen(profile.ScopedID())
+
 	// return parsed profile
 	return profile, nil
 }

profile/merge.go

@@ -1,8 +1,10 @@
 package profile
 
 import (
+	"errors"
 	"fmt"
 	"sync"
+	"time"
 
 	"github.com/safing/portbase/database/record"
 )
@@ -11,19 +13,42 @@ import (
 // The new profile is saved and returned.
 // Only the icon and fingerprints are inherited from other profiles.
 // All other information is taken only from the primary profile.
-func MergeProfiles(primary *Profile, secondaries ...*Profile) (newProfile *Profile, err error) {
+func MergeProfiles(name string, primary *Profile, secondaries ...*Profile) (newProfile *Profile, err error) {
+	if primary == nil || len(secondaries) == 0 {
+		return nil, errors.New("must supply both a primary and at least one secondary profile for merging")
+	}
+
 	// Fill info from primary profile.
+	nowUnix := time.Now().Unix()
 	newProfile = &Profile{
 		Base:                record.Base{},
 		RWMutex:             sync.RWMutex{},
 		ID:                  "", // Omit ID to derive it from the new fingerprints.
 		Source:              primary.Source,
-		Name:                primary.Name,
+		Name:                name,
 		Description:         primary.Description,
 		Homepage:            primary.Homepage,
 		UsePresentationPath: false, // Disable presentation path.
 		SecurityLevel:       primary.SecurityLevel,
 		Config:              primary.Config,
+		Created:             nowUnix,
+	}
+
+	// Fall back to name of primary profile, if none is set.
+	if newProfile.Name == "" {
+		newProfile.Name = primary.Name
+	}
+
+	// If any profile was edited, set LastEdited to now.
+	if primary.LastEdited > 0 {
+		newProfile.LastEdited = nowUnix
+	} else {
+		for _, sp := range secondaries {
+			if sp.LastEdited > 0 {
+				newProfile.LastEdited = nowUnix
+				break
+			}
+		}
 	}
 
 	// Collect all icons.
@@ -35,7 +60,7 @@ func MergeProfiles(primary *Profile, secondaries ...*Profile) (newProfile *Profi
 	newProfile.Icons = sortAndCompactIcons(newProfile.Icons)
 
 	// Collect all fingerprints.
-	newProfile.Fingerprints = make([]Fingerprint, 0, len(secondaries)+1) // Guess the needed space.
+	newProfile.Fingerprints = make([]Fingerprint, 0, len(primary.Fingerprints)+len(secondaries)) // Guess the needed space.
 	newProfile.Fingerprints = addFingerprints(newProfile.Fingerprints, primary.Fingerprints, primary.ScopedID())
 	for _, sp := range secondaries {
 		newProfile.Fingerprints = addFingerprints(newProfile.Fingerprints, sp.Fingerprints, sp.ScopedID())
@@ -44,26 +69,19 @@ func MergeProfiles(primary *Profile, secondaries ...*Profile) (newProfile *Profi
 
 	// Save new profile.
 	newProfile = New(newProfile)
-	err = newProfile.Save()
+	if err := newProfile.Save(); err != nil {
-	if err != nil {
 		return nil, fmt.Errorf("failed to save merged profile: %w", err)
 	}
-	// FIXME: Should we ... ?
-	// newProfile.updateMetadata()
-	// newProfile.updateMetadataFromSystem()
 
 	// Delete all previous profiles.
-	// FIXME:
+	if err := primary.delete(); err != nil {
-	/*
+		return nil, fmt.Errorf("failed to delete primary profile %s: %w", primary.ScopedID(), err)
-		primary.Meta().Delete()
+	}
-		// Set as outdated and remove from active profiles.
+	for _, sp := range secondaries {
-		// Signify that profile was deleted and save for sync.
+		if err := sp.delete(); err != nil {
-		for _, sp := range secondaries {
+			return nil, fmt.Errorf("failed to delete secondary profile %s: %w", sp.ScopedID(), err)
-			sp.Meta().Delete()
+		}
-			// Set as outdated and remove from active profiles.
-			// Signify that profile was deleted and save for sync.
 	}
-	*/
 
 	return newProfile, nil
 }

profile/meta.go

@@ -0,0 +1,184 @@
+package profile
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/safing/portbase/database/record"
+)
+
+// ProfilesMetadata holds metadata about all profiles that are not fit to be
+// stored with the profiles themselves.
+type ProfilesMetadata struct {
+	record.Base
+	sync.Mutex
+
+	States map[string]*MetaState
+}
+
+// MetaState describes the state of a profile.
+type MetaState struct {
+	State string
+	At    time.Time
+}
+
+// Profile metadata states.
+const (
+	MetaStateSeen    = "seen"
+	MetaStateDeleted = "deleted"
+)
+
+// EnsureProfilesMetadata ensures that the given record is a *ProfilesMetadata, and returns it.
+func EnsureProfilesMetadata(r record.Record) (*ProfilesMetadata, error) {
+	// unwrap
+	if r.IsWrapped() {
+		// only allocate a new struct, if we need it
+		newMeta := &ProfilesMetadata{}
+		err := record.Unwrap(r, newMeta)
+		if err != nil {
+			return nil, err
+		}
+		return newMeta, nil
+	}
+
+	// or adjust type
+	newMeta, ok := r.(*ProfilesMetadata)
+	if !ok {
+		return nil, fmt.Errorf("record not of type *Profile, but %T", r)
+	}
+	return newMeta, nil
+}
+
+var (
+	profilesMetadataKey = ProfilesDBPath + "meta"
+
+	meta *ProfilesMetadata
+
+	removeDeletedEntriesAfter = 30 * 24 * time.Hour
+)
+
+// loadProfilesMetadata loads the profile metadata from the database.
+// It may only be called during module starting, as there is no lock for "meta" itself.
+func loadProfilesMetadata() error {
+	r, err := profileDB.Get(profilesMetadataKey)
+	if err != nil {
+		return err
+	}
+	loadedMeta, err := EnsureProfilesMetadata(r)
+	if err != nil {
+		return err
+	}
+
+	// Set package variable.
+	meta = loadedMeta
+	return nil
+}
+
+func (meta *ProfilesMetadata) check() {
+	if meta.States == nil {
+		meta.States = make(map[string]*MetaState)
+	}
+}
+
+// Save saves the profile metadata to the database.
+func (meta *ProfilesMetadata) Save() error {
+	if meta == nil {
+		return nil
+	}
+
+	func() {
+		meta.Lock()
+		defer meta.Unlock()
+
+		if !meta.KeyIsSet() {
+			meta.SetKey(profilesMetadataKey)
+		}
+	}()
+
+	meta.Clean()
+	return profileDB.Put(meta)
+}
+
+// Clean removes old entries.
+func (meta *ProfilesMetadata) Clean() {
+	if meta == nil {
+		return
+	}
+
+	meta.Lock()
+	defer meta.Unlock()
+
+	for key, state := range meta.States {
+		switch {
+		case state == nil:
+			delete(meta.States, key)
+		case state.State != MetaStateDeleted:
+			continue
+		case time.Since(state.At) > removeDeletedEntriesAfter:
+			delete(meta.States, key)
+		}
+	}
+}
+
+// GetLastSeen returns when the profile with the given ID was last seen.
+func (meta *ProfilesMetadata) GetLastSeen(scopedID string) *time.Time {
+	if meta == nil {
+		return nil
+	}
+
+	meta.Lock()
+	defer meta.Unlock()
+
+	state := meta.States[scopedID]
+	switch {
+	case state == nil:
+		return nil
+	case state.State == MetaStateSeen:
+		return &state.At
+	default:
+		return nil
+	}
+}
+
+// UpdateLastSeen sets the profile with the given ID as last seen now.
+func (meta *ProfilesMetadata) UpdateLastSeen(scopedID string) {
+	if meta == nil {
+		return
+	}
+
+	meta.Lock()
+	defer meta.Unlock()
+
+	meta.States[scopedID] = &MetaState{
+		State: MetaStateSeen,
+		At:    time.Now().UTC(),
+	}
+}
+
+// MarkDeleted marks the profile with the given ID as deleted.
+func (meta *ProfilesMetadata) MarkDeleted(scopedID string) {
+	if meta == nil {
+		return
+	}
+
+	meta.Lock()
+	defer meta.Unlock()
+
+	meta.States[scopedID] = &MetaState{
+		State: MetaStateDeleted,
+		At:    time.Now().UTC(),
+	}
+}
+
+// RemoveState removes any state of the profile with the given ID.
+func (meta *ProfilesMetadata) RemoveState(scopedID string) {
+	if meta == nil {
+		return
+	}
+
+	meta.Lock()
+	defer meta.Unlock()
+
+	delete(meta.States, scopedID)
+}

profile/migrations.go

@@ -32,11 +32,11 @@ func registerMigrations() error {
 			Version:     "v1.4.7",
 			MigrateFunc: migrateIcons,
 		},
-		// migration.Migration{
+		migration.Migration{
-		// 	Description: "Migrate from random profile IDs to fingerprint-derived IDs",
+			Description: "Migrate from random profile IDs to fingerprint-derived IDs",
-		// 	Version:     "v1.5.1",
+			Version:     "v1.5.0",
-		// 	MigrateFunc: migrateToDerivedIDs,
+			MigrateFunc: migrateToDerivedIDs,
-		// },
+		},
 	)
 }
 

profile/module.go

@@ -1,8 +1,10 @@
 package profile
 
 import (
+	"errors"
 	"os"
 
+	"github.com/safing/portbase/database"
 	"github.com/safing/portbase/database/migration"
 	"github.com/safing/portbase/log"
 	"github.com/safing/portbase/modules"
@@ -16,13 +18,16 @@ var (
 	updatesPath string
 )
 
+// Events.
 const (
-	profileConfigChange = "profile config change"
+	ConfigChangeEvent = "profile config change"
+	DeletedEvent      = "profile deleted"
 )
 
 func init() {
-	module = modules.Register("profiles", prep, start, nil, "base", "updates")
+	module = modules.Register("profiles", prep, start, stop, "base", "updates")
-	module.RegisterEvent(profileConfigChange, true)
+	module.RegisterEvent(ConfigChangeEvent, true)
+	module.RegisterEvent(DeletedEvent, true)
 }
 
 func prep() error {
@@ -47,6 +52,14 @@ func start() error {
 		updatesPath += string(os.PathSeparator)
 	}
 
+	if err := loadProfilesMetadata(); err != nil {
+		if !errors.Is(err, database.ErrNotFound) {
+			log.Warningf("profile: failed to load profiles metadata, falling back to empty state: %s", err)
+		}
+		meta = &ProfilesMetadata{}
+	}
+	meta.check()
+
 	if err := migrations.Migrate(module.Ctx); err != nil {
 		log.Errorf("profile: migrations failed: %s", err)
 	}
@@ -73,5 +86,13 @@ func start() error {
 		log.Warningf("profile: error during loading global profile from configuration: %s", err)
 	}
 
+	if err := registerAPIEndpoints(); err != nil {
+		return err
+	}
+
 	return nil
 }
+
+func stop() error {
+	return meta.Save()
+}

profile/profile.go

@@ -304,6 +304,24 @@ func (profile *Profile) Save() error {
 	return profileDB.Put(profile)
 }
 
+// delete deletes the profile from the database.
+func (profile *Profile) delete() error {
+	// Check if a key is set.
+	if !profile.KeyIsSet() {
+		return errors.New("key is not set")
+	}
+
+	// Delete from database.
+	profile.Meta().Delete()
+	err := profileDB.Put(profile)
+	if err != nil {
+		return err
+	}
+
+	// Post handling is done by the profile update feed.
+	return nil
+}
+
 // MarkStillActive marks the profile as still active.
 func (profile *Profile) MarkStillActive() {
 	atomic.StoreInt64(profile.lastActive, time.Now().Unix())