Add credential checks

This change adds authentication/credential checks to sensitive API
methods, depending on the access level granted to the authenticated
user. It also adds the logic to save the authenticated user to the audit
log entries.

Note: the protobuf definitions were updated in a backwards-incompatible
way (KillSwitchAuthorizedUser.AccessLevel enum). This can be done since
this product hasn't yet launched.

Fixed: twpowertools:46
Change-Id: I9bf888d6108f463369143610d4bd5b256035b68f
diff --git a/api_proto/common.pb.go b/api_proto/common.pb.go
index 279881e..14891d1 100644
--- a/api_proto/common.pb.go
+++ b/api_proto/common.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.1
+// 	protoc        v3.17.3
 // source: api_proto/common.proto
 
 package api_proto
diff --git a/api_proto/kill_switch.pb.go b/api_proto/kill_switch.pb.go
index 4dd0884..f46160f 100644
--- a/api_proto/kill_switch.pb.go
+++ b/api_proto/kill_switch.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.1
+// 	protoc        v3.17.3
 // source: api_proto/kill_switch.proto
 
 package api_proto
diff --git a/api_proto/kill_switch_objects.pb.go b/api_proto/kill_switch_objects.pb.go
index f449ce6..078833e 100644
--- a/api_proto/kill_switch_objects.pb.go
+++ b/api_proto/kill_switch_objects.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.1
+// 	protoc        v3.17.3
 // source: api_proto/kill_switch_objects.proto
 
 package api_proto
@@ -77,21 +77,21 @@
 
 const (
 	KillSwitchAuthorizedUser_ACCESS_LEVEL_NONE      KillSwitchAuthorizedUser_AccessLevel = 0
-	KillSwitchAuthorizedUser_ACCESS_LEVEL_ACTIVATOR KillSwitchAuthorizedUser_AccessLevel = 1 // The user may enable/disable kill switches.
-	KillSwitchAuthorizedUser_ACCESS_LEVEL_ADMIN     KillSwitchAuthorizedUser_AccessLevel = 2 // The user may perform any action.
+	KillSwitchAuthorizedUser_ACCESS_LEVEL_ACTIVATOR KillSwitchAuthorizedUser_AccessLevel = 5  // The user may enable/disable kill switches.
+	KillSwitchAuthorizedUser_ACCESS_LEVEL_ADMIN     KillSwitchAuthorizedUser_AccessLevel = 10 // The user may perform any action.
 )
 
 // Enum value maps for KillSwitchAuthorizedUser_AccessLevel.
 var (
 	KillSwitchAuthorizedUser_AccessLevel_name = map[int32]string{
-		0: "ACCESS_LEVEL_NONE",
-		1: "ACCESS_LEVEL_ACTIVATOR",
-		2: "ACCESS_LEVEL_ADMIN",
+		0:  "ACCESS_LEVEL_NONE",
+		5:  "ACCESS_LEVEL_ACTIVATOR",
+		10: "ACCESS_LEVEL_ADMIN",
 	}
 	KillSwitchAuthorizedUser_AccessLevel_value = map[string]int32{
 		"ACCESS_LEVEL_NONE":      0,
-		"ACCESS_LEVEL_ACTIVATOR": 1,
-		"ACCESS_LEVEL_ADMIN":     2,
+		"ACCESS_LEVEL_ACTIVATOR": 5,
+		"ACCESS_LEVEL_ADMIN":     10,
 	}
 )
 
@@ -878,9 +878,9 @@
 	0x65, 0x73, 0x73, 0x4c, 0x65, 0x76, 0x65, 0x6c, 0x12, 0x15, 0x0a, 0x11, 0x41, 0x43, 0x43, 0x45,
 	0x53, 0x53, 0x5f, 0x4c, 0x45, 0x56, 0x45, 0x4c, 0x5f, 0x4e, 0x4f, 0x4e, 0x45, 0x10, 0x00, 0x12,
 	0x1a, 0x0a, 0x16, 0x41, 0x43, 0x43, 0x45, 0x53, 0x53, 0x5f, 0x4c, 0x45, 0x56, 0x45, 0x4c, 0x5f,
-	0x41, 0x43, 0x54, 0x49, 0x56, 0x41, 0x54, 0x4f, 0x52, 0x10, 0x01, 0x12, 0x16, 0x0a, 0x12, 0x41,
+	0x41, 0x43, 0x54, 0x49, 0x56, 0x41, 0x54, 0x4f, 0x52, 0x10, 0x05, 0x12, 0x16, 0x0a, 0x12, 0x41,
 	0x43, 0x43, 0x45, 0x53, 0x53, 0x5f, 0x4c, 0x45, 0x56, 0x45, 0x4c, 0x5f, 0x41, 0x44, 0x4d, 0x49,
-	0x4e, 0x10, 0x02, 0x22, 0x58, 0x0a, 0x18, 0x4b, 0x69, 0x6c, 0x6c, 0x53, 0x77, 0x69, 0x74, 0x63,
+	0x4e, 0x10, 0x0a, 0x22, 0x58, 0x0a, 0x18, 0x4b, 0x69, 0x6c, 0x6c, 0x53, 0x77, 0x69, 0x74, 0x63,
 	0x68, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x66, 0x6f, 0x72, 0x6d, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x12,
 	0x1d, 0x0a, 0x03, 0x6f, 0x6c, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0b, 0x2e, 0x4b,
 	0x69, 0x6c, 0x6c, 0x53, 0x77, 0x69, 0x74, 0x63, 0x68, 0x52, 0x03, 0x6f, 0x6c, 0x64, 0x12, 0x1d,
diff --git a/api_proto/kill_switch_objects.proto b/api_proto/kill_switch_objects.proto
index 11c2c16..041291f 100644
--- a/api_proto/kill_switch_objects.proto
+++ b/api_proto/kill_switch_objects.proto
@@ -32,8 +32,8 @@
   string email = 3;
   enum AccessLevel {
     ACCESS_LEVEL_NONE = 0;
-    ACCESS_LEVEL_ACTIVATOR = 1; // The user may enable/disable kill switches.
-    ACCESS_LEVEL_ADMIN = 2; // The user may perform any action.
+    ACCESS_LEVEL_ACTIVATOR = 5; // The user may enable/disable kill switches.
+    ACCESS_LEVEL_ADMIN = 10; // The user may perform any action.
   }
   AccessLevel access_level = 4;
 }
diff --git a/cmd/server/server.go b/cmd/server/server.go
index 684d1d7..06c90b8 100644
--- a/cmd/server/server.go
+++ b/cmd/server/server.go
@@ -7,11 +7,15 @@
 	"fmt"
 	"log"
 	"net"
+	"net/http"
 	"time"
 
+	"github.com/ReneKroon/ttlcache/v2"
 	_ "github.com/go-sql-driver/mysql"
+	"google.golang.org/api/idtoken"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/reflection"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/proto"
@@ -21,16 +25,23 @@
 )
 
 var (
+	authorizedUsersCacheTime = 15 * time.Minute
+)
+
+var (
 	port              = flag.Int("port", 10000, "The server port")
 	dbDsn             = flag.String("db", "", "MySQL/MariaDB database data source name (DSN)") // https://github.com/go-sql-driver/mysql#dsn-data-source-name
 	dbConnMaxLifetime = flag.Int("dbConnMaxLifetime", 3*60, "Maximum amount of time a connection to the database may be reused in seconds.")
 	dbMaxOpenConns    = flag.Int("dbMaxOpenConns", 5, "Maximum number of open connections to the database.")
 	dbMaxIdleConns    = flag.Int("dbMaxIdleConns", *dbMaxOpenConns, "Maximum number of connections to the database in the idle connection pool.")
+	jwtAudience       = flag.String("jwtAudience", "", "JWT audience string.")
 )
 
 type killSwitchServiceServer struct {
 	pb.UnimplementedKillSwitchServiceServer
-	dbPool *sql.DB
+	dbPool       *sql.DB
+	jwtValidator *idtoken.Validator
+	cache        ttlcache.SimpleCache
 }
 
 func newKillSwitchServiceServer() *killSwitchServiceServer {
@@ -51,9 +62,82 @@
 	}
 
 	s.dbPool = db
+
+	client := &http.Client{}
+	validator, err := idtoken.NewValidator(context.Background(), idtoken.WithHTTPClient(client))
+	if err != nil {
+		log.Fatalf("unable to start idtoken validator: %v", err)
+	}
+	s.jwtValidator = validator
+
+	s.cache = ttlcache.NewCache()
+
 	return s
 }
 
+func getAuthenticatedUser(s *killSwitchServiceServer, ctx context.Context) (*pb.KillSwitchAuthorizedUser, error) {
+	md, ok := metadata.FromIncomingContext(ctx)
+	if !ok {
+		return nil, status.Errorf(codes.Internal, "getAuthenticatedUser: can't retrieve metadata from incoming request")
+	}
+
+	authorization := md.Get("authorization")
+	if len(authorization) < 1 {
+		return nil, status.Errorf(codes.Unauthenticated, "Unauthenticated")
+	}
+
+	token := authorization[0]
+	payload, err := s.jwtValidator.Validate(ctx, token, *jwtAudience)
+	if err != nil {
+		return nil, status.Errorf(codes.Unauthenticated, "getAuthenticatedUser: can't parse idtoken")
+	}
+
+	var authorizedUsers []*pb.KillSwitchAuthorizedUser
+	var okAssertion bool
+
+	authorizedUsersInterface, err := s.cache.Get("AuthorizedUsers")
+	if err == nil {
+		authorizedUsers, okAssertion = authorizedUsersInterface.([]*pb.KillSwitchAuthorizedUser)
+	}
+	if err != nil || !okAssertion {
+		freshAuthorizedUsers, err := db.ListAuthorizedUsers(s.dbPool, ctx)
+		if err != nil {
+			log.Printf("getAuthenticatedUser: error while getting authorized users: %v", err)
+			return nil, status.Errorf(codes.Internal, "getAuthenticatedUser: can't get list of authorized users")
+		}
+		s.cache.SetWithTTL("AuthorizedUsers", freshAuthorizedUsers, authorizedUsersCacheTime)
+		authorizedUsers = freshAuthorizedUsers
+	}
+
+	// Check if the current user is one of the authorized users, and if so return it.
+	for _, u := range authorizedUsers {
+		if u.GetGoogleUid() != "" && u.GetGoogleUid() == payload.Subject {
+			return u, nil
+		}
+
+		email, emailExists := payload.Claims["email"]
+		emailVerified, emailVerifiedExists := payload.Claims["email_verified"]
+
+		if u.GetEmail() != "" && emailVerifiedExists && emailExists && emailVerified == true && email == u.GetEmail() {
+			return u, nil
+		}
+	}
+
+	return nil, status.Errorf(codes.PermissionDenied, "User is not part of the authorized users list.")
+}
+
+func userHasAccessLevel(requiredLevel pb.KillSwitchAuthorizedUser_AccessLevel, user *pb.KillSwitchAuthorizedUser) bool {
+	return requiredLevel <= user.GetAccessLevel()
+}
+
+func errorWhenMissingAccess(requiredLevel pb.KillSwitchAuthorizedUser_AccessLevel, user *pb.KillSwitchAuthorizedUser) error {
+	if userHasAccessLevel(requiredLevel, user) {
+		return nil
+	}
+
+	return status.Errorf(codes.PermissionDenied, "User has lower access level than the action that they are trying to perform.")
+}
+
 func (s *killSwitchServiceServer) GetKillSwitchStatus(ctx context.Context, req *pb.GetKillSwitchStatusRequest) (*pb.GetKillSwitchStatusResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "Unimplemented method.")
 }
@@ -70,6 +154,16 @@
 }
 
 func (s *killSwitchServiceServer) SyncFeatures(ctx context.Context, req *pb.SyncFeaturesRequest) (*pb.SyncFeaturesResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ADMIN, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	log.Println("Syncing features...")
 
 	for _, feature := range req.Features {
@@ -109,11 +203,21 @@
 }
 
 func (s *killSwitchServiceServer) EnableKillSwitch(ctx context.Context, req *pb.EnableKillSwitchRequest) (*pb.EnableKillSwitchResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ACTIVATOR, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	if req.GetKillSwitch().GetFeature().GetId() == 0 {
 		return nil, status.Errorf(codes.InvalidArgument, "feature.id must be set.")
 	}
 
-	err := db.EnableKillSwitch(s.dbPool, ctx, req.KillSwitch)
+	err = db.EnableKillSwitch(s.dbPool, ctx, req.KillSwitch, authenticatedUser)
 	if err != nil {
 		return nil, status.Errorf(codes.Unavailable, err.Error())
 	}
@@ -122,11 +226,21 @@
 }
 
 func (s *killSwitchServiceServer) DisableKillSwitch(ctx context.Context, req *pb.DisableKillSwitchRequest) (*pb.DisableKillSwitchResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ACTIVATOR, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	if req.GetKillSwitchId() == 0 {
 		return nil, status.Errorf(codes.InvalidArgument, "kill_switch_id must be set.")
 	}
 
-	err := db.DisableKillSwitch(s.dbPool, ctx, req.KillSwitchId)
+	err = db.DisableKillSwitch(s.dbPool, ctx, req.KillSwitchId, authenticatedUser)
 	if err != nil {
 		return nil, status.Errorf(codes.Unavailable, err.Error())
 	}
@@ -135,6 +249,16 @@
 }
 
 func (s *killSwitchServiceServer) ListAuthorizedUsers(ctx context.Context, req *pb.ListAuthorizedUsersRequest) (*pb.ListAuthorizedUsersResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ACTIVATOR, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	users, err := db.ListAuthorizedUsers(s.dbPool, ctx)
 	if err != nil {
 		return nil, status.Errorf(codes.Unavailable, err.Error())
@@ -146,11 +270,21 @@
 }
 
 func (s *killSwitchServiceServer) AddAuthorizedUser(ctx context.Context, req *pb.AddAuthorizedUserRequest) (*pb.AddAuthorizedUserResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ADMIN, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	if req.GetUser().GetGoogleUid() == "" && req.GetUser().GetEmail() == "" {
 		return nil, status.Errorf(codes.InvalidArgument, "At least one of google_uid or email must be set.")
 	}
 
-	err := db.AddAuthorizedUser(s.dbPool, ctx, req.User)
+	err = db.AddAuthorizedUser(s.dbPool, ctx, req.User, authenticatedUser)
 	if err != nil {
 		return nil, status.Errorf(codes.Unavailable, err.Error())
 	}
@@ -159,6 +293,16 @@
 }
 
 func (s *killSwitchServiceServer) UpdateAuthorizedUser(ctx context.Context, req *pb.UpdateAuthorizedUserRequest) (*pb.UpdateAuthorizedUserResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ADMIN, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	if req.GetUserId() == 0 {
 		return nil, status.Errorf(codes.InvalidArgument, "user_id must be greater than 0.")
 	}
@@ -167,7 +311,7 @@
 		return nil, status.Errorf(codes.InvalidArgument, "At least one of google_uid or email must be set.")
 	}
 
-	err := db.UpdateAuthorizedUser(s.dbPool, ctx, req.UserId, req.User)
+	err = db.UpdateAuthorizedUser(s.dbPool, ctx, req.UserId, req.User, authenticatedUser)
 	if err != nil {
 		return nil, status.Errorf(codes.Unavailable, err.Error())
 	}
@@ -176,11 +320,21 @@
 }
 
 func (s *killSwitchServiceServer) DeleteAuthorizedUser(ctx context.Context, req *pb.DeleteAuthorizedUserRequest) (*pb.DeleteAuthorizedUserResponse, error) {
+	// This method requires authentication
+	authenticatedUser, err := getAuthenticatedUser(s, ctx)
+	if err != nil {
+		return nil, err
+	}
+	err = errorWhenMissingAccess(pb.KillSwitchAuthorizedUser_ACCESS_LEVEL_ADMIN, authenticatedUser)
+	if err != nil {
+		return nil, err
+	}
+
 	if req.GetUserId() == 0 {
 		return nil, status.Errorf(codes.InvalidArgument, "user_id must be greater than 0.")
 	}
 
-	err := db.DeleteAuthorizedUser(s.dbPool, ctx, req.UserId)
+	err = db.DeleteAuthorizedUser(s.dbPool, ctx, req.UserId, authenticatedUser)
 	if err != nil {
 		return nil, status.Errorf(codes.Unavailable, err.Error())
 	}
diff --git a/go.mod b/go.mod
index b56fa0d..35d81e7 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,10 @@
 go 1.16
 
 require (
-	github.com/Masterminds/semver/v3 v3.1.1 // indirect
+	github.com/Masterminds/semver/v3 v3.1.1
+	github.com/ReneKroon/ttlcache/v2 v2.8.0
 	github.com/go-sql-driver/mysql v1.6.0
+	google.golang.org/api v0.54.0
 	google.golang.org/grpc v1.40.0
-	google.golang.org/protobuf v1.25.0
+	google.golang.org/protobuf v1.27.1
 )
diff --git a/go.sum b/go.sum
index fc8eea2..d3f627d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,31 +1,101 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
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+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
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+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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 google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -107,10 +525,26 @@
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/internal/db/authorized_users.go b/internal/db/authorized_users.go
index 13a272f..50674af 100644
--- a/internal/db/authorized_users.go
+++ b/internal/db/authorized_users.go
@@ -20,7 +20,7 @@
 	return &u, nil
 }
 
-func AddAuthorizedUser(db *sql.DB, ctx context.Context, u *pb.KillSwitchAuthorizedUser) error {
+func AddAuthorizedUser(db *sql.DB, ctx context.Context, u *pb.KillSwitchAuthorizedUser, currentUser *pb.KillSwitchAuthorizedUser) error {
 	tx, err := db.BeginTx(ctx, nil)
 	if err != nil {
 		return err
@@ -41,6 +41,7 @@
 	u.Id = int32(id)
 
 	logEntry := &pb.KillSwitchAuditLogEntry{
+		User: currentUser,
 		Description: &pb.KillSwitchAuditLogEntry_AuthorizedUserAdded_{
 			&pb.KillSwitchAuditLogEntry_AuthorizedUserAdded{
 				User: u,
@@ -55,7 +56,7 @@
 	return tx.Commit()
 }
 
-func UpdateAuthorizedUser(db *sql.DB, ctx context.Context, id int32, newUser *pb.KillSwitchAuthorizedUser) error {
+func UpdateAuthorizedUser(db *sql.DB, ctx context.Context, id int32, newUser *pb.KillSwitchAuthorizedUser, currentUser *pb.KillSwitchAuthorizedUser) error {
 	oldUser, err := GetAuthorizedUserById(db, ctx, id)
 	if err != nil {
 		return err
@@ -77,6 +78,7 @@
 	newUser.Id = id
 
 	logEntry := &pb.KillSwitchAuditLogEntry{
+		User: currentUser,
 		Description: &pb.KillSwitchAuditLogEntry_AuthorizedUserUpdated_{
 			&pb.KillSwitchAuditLogEntry_AuthorizedUserUpdated{
 				Transformation: &pb.AuthorizedUserTransformation{
@@ -94,7 +96,7 @@
 	return tx.Commit()
 }
 
-func DeleteAuthorizedUser(db *sql.DB, ctx context.Context, id int32) error {
+func DeleteAuthorizedUser(db *sql.DB, ctx context.Context, id int32, currentUser *pb.KillSwitchAuthorizedUser) error {
 	u, err := GetAuthorizedUserById(db, ctx, id)
 	if err != nil {
 		return err
@@ -114,6 +116,7 @@
 	}
 
 	logEntry := &pb.KillSwitchAuditLogEntry{
+		User: currentUser,
 		Description: &pb.KillSwitchAuditLogEntry_AuthorizedUserDeleted_{
 			&pb.KillSwitchAuditLogEntry_AuthorizedUserDeleted{
 				OldUser: u,
diff --git a/internal/db/kill_switch.go b/internal/db/kill_switch.go
index 8b80286..3c85f2b 100644
--- a/internal/db/kill_switch.go
+++ b/internal/db/kill_switch.go
@@ -91,7 +91,7 @@
 	return killSwitches, nil
 }
 
-func EnableKillSwitch(db *sql.DB, ctx context.Context, k *pb.KillSwitch) error {
+func EnableKillSwitch(db *sql.DB, ctx context.Context, k *pb.KillSwitch, currentUser *pb.KillSwitchAuthorizedUser) error {
 	if k.MinVersion != "" && !isValidSemVersion(k.MinVersion) {
 		return fmt.Errorf("min_version is not a valid semantic version.")
 	}
@@ -148,6 +148,7 @@
 	}
 
 	logEntry := &pb.KillSwitchAuditLogEntry{
+		User: currentUser,
 		Description: &pb.KillSwitchAuditLogEntry_KillSwitchEnabled_{
 			&pb.KillSwitchAuditLogEntry_KillSwitchEnabled{
 				KillSwitch: k,
@@ -162,7 +163,7 @@
 	return tx.Commit()
 }
 
-func DisableKillSwitch(db *sql.DB, ctx context.Context, id int32) error {
+func DisableKillSwitch(db *sql.DB, ctx context.Context, id int32, currentUser *pb.KillSwitchAuthorizedUser) error {
 	oldKillSwitch, err := GetKillSwitchById(db, ctx, id)
 	if err != nil {
 		return err
@@ -188,6 +189,7 @@
 	}
 
 	logEntry := &pb.KillSwitchAuditLogEntry{
+		User: currentUser,
 		Description: &pb.KillSwitchAuditLogEntry_KillSwitchDisabled_{
 			&pb.KillSwitchAuditLogEntry_KillSwitchDisabled{
 				Transformation: &pb.KillSwitchTransformation{