Allow clients to change password

actions/client.go

@@ -338,3 +338,47 @@ func ActionClientLogin(c *cli.Context) error {
 
 	return nil
 }
+
+func ActionClientChangePassword(c *cli.Context) error {
+	cfg, err := getConfig(c)
+	if err != nil {
+		return err
+	}
+
+	addr := cfg.Client.DefaultServer
+	if c.IsSet("addr") {
+		addr = c.String("addr")
+	}
+
+	clientCreds, err := cfg.Client.Creds()
+	if err != nil {
+		return err
+	}
+	conn, err := grpc.DialContext(c.Context, addr, grpc.WithTransportCredentials(clientCreds))
+
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	fmt.Printf("current password: ")
+	oldPasswordBytes, err := term.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return cli.Exit(fmt.Sprintf("unable to read password: %s", err), 1)
+	}
+	fmt.Println()
+	oldPassword := string(oldPasswordBytes)
+	fmt.Printf("new password: ")
+	newPasswordBytes, err := term.ReadPassword(int(syscall.Stdin))
+	if err != nil {
+		return cli.Exit(fmt.Sprintf("unable to read password: %s", err), 1)
+	}
+	fmt.Println()
+	newPassword := string(newPasswordBytes)
+
+	client := pb.NewUserServiceClient(conn)
+	if _, err := client.ChangePassword(c.Context, &pb.ChangePasswordRequest{OldPassword: oldPassword, NewPassword: newPassword}); err != nil {
+		return cli.Exit(fmt.Sprintf("unable to change password: %s", err), 1)
+	}
+	return nil
+}

actions/serve.go

@@ -130,7 +130,7 @@ func ActionServe(c *cli.Context) error {
 
 		grpcServer := grpc.NewServer(
 			grpc.Creds(creds),
-			grpc.ChainUnaryInterceptor(interceptors.NewAuthInterceptor(&store.MemoryStore{})),
+			grpc.ChainUnaryInterceptor(interceptors.NewAuthInterceptor(userStore)),
 		)
 		pb.RegisterFileServiceServer(grpcServer, grpcFileServer)
 		pb.RegisterUserServiceServer(grpcServer, grpcUserServer)
@@ -216,7 +216,7 @@ func initializeUsers(us store.UserStore) error {
 	if err := us.StoreUser(admin); err != nil {
 		return err
 	}
-	log.Printf("user created %s:%s", admin.Username, password)
+	log.Printf("user created with id %s:%s", admin.Username, password)
 
 	return nil
 }

main.go

@@ -104,6 +104,12 @@ func main() {
 						},
 					},
 					{
+						Name:   "change-password",
+						Usage:  "Change password",
+						Action: actions.ActionClientChangePassword,
+					},
+					{
+						// TODO: Remove
 						Name:   "config-init",
 						Usage:  "Initialize default config",
 						Action: actions.ActionInitConfig,

pb/ezshare.pb.go

@@ -1008,6 +1008,62 @@ func (x *ApproveUserRequest) GetUserId() string {
 	return ""
 }
 
+// Change password
+type ChangePasswordRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	OldPassword string `protobuf:"bytes,1,opt,name=old_password,json=oldPassword,proto3" json:"old_password,omitempty"`
+	NewPassword string `protobuf:"bytes,2,opt,name=new_password,json=newPassword,proto3" json:"new_password,omitempty"`
+}
+
+func (x *ChangePasswordRequest) Reset() {
+	*x = ChangePasswordRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_protos_ezshare_proto_msgTypes[18]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ChangePasswordRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ChangePasswordRequest) ProtoMessage() {}
+
+func (x *ChangePasswordRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_protos_ezshare_proto_msgTypes[18]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ChangePasswordRequest.ProtoReflect.Descriptor instead.
+func (*ChangePasswordRequest) Descriptor() ([]byte, []int) {
+	return file_protos_ezshare_proto_rawDescGZIP(), []int{18}
+}
+
+func (x *ChangePasswordRequest) GetOldPassword() string {
+	if x != nil {
+		return x.OldPassword
+	}
+	return ""
+}
+
+func (x *ChangePasswordRequest) GetNewPassword() string {
+	if x != nil {
+		return x.NewPassword
+	}
+	return ""
+}
+
 type File_Metadata struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1021,7 +1077,7 @@ type File_Metadata struct {
 func (x *File_Metadata) Reset() {
 	*x = File_Metadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_protos_ezshare_proto_msgTypes[18]
+		mi := &file_protos_ezshare_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1034,7 +1090,7 @@ func (x *File_Metadata) String() string {
 func (*File_Metadata) ProtoMessage() {}
 
 func (x *File_Metadata) ProtoReflect() protoreflect.Message {
-	mi := &file_protos_ezshare_proto_msgTypes[18]
+	mi := &file_protos_ezshare_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1083,7 +1139,7 @@ type ListFilesResponse_ListFileInfo struct {
 func (x *ListFilesResponse_ListFileInfo) Reset() {
 	*x = ListFilesResponse_ListFileInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_protos_ezshare_proto_msgTypes[19]
+		mi := &file_protos_ezshare_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1096,7 +1152,7 @@ func (x *ListFilesResponse_ListFileInfo) String() string {
 func (*ListFilesResponse_ListFileInfo) ProtoMessage() {}
 
 func (x *ListFilesResponse_ListFileInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_protos_ezshare_proto_msgTypes[19]
+	mi := &file_protos_ezshare_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1227,46 +1283,56 @@ var file_protos_ezshare_proto_rawDesc = []byte{
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+	0x12, 0x38, 0x0a, 0x07, 0x41, 0x70, 0x70, 0x72, 0x6f, 0x76, 0x65, 0x12, 0x1b, 0x2e, 0x65, 0x7a,
+	0x73, 0x68, 0x61, 0x72, 0x65, 0x2e, 0x41, 0x70, 0x70, 0x72, 0x6f, 0x76, 0x65, 0x55, 0x73, 0x65,
+	0x72, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x0e, 0x2e, 0x65, 0x7a, 0x73, 0x68, 0x61,
+	0x72, 0x65, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12, 0x42, 0x0a, 0x0e, 0x43, 0x68,
+	0x61, 0x6e, 0x67, 0x65, 0x50, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64, 0x12, 0x1e, 0x2e, 0x65,
+	0x7a, 0x73, 0x68, 0x61, 0x72, 0x65, 0x2e, 0x43, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x50, 0x61, 0x73,
+	0x73, 0x77, 0x6f, 0x72, 0x64, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x0e, 0x2e, 0x65,
+	0x7a, 0x73, 0x68, 0x61, 0x72, 0x65, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x42, 0x23,
+	0x5a, 0x21, 0x67, 0x69, 0x74, 0x65, 0x61, 0x2e, 0x62, 0x65, 0x6e, 0x6e, 0x79, 0x2e, 0x64, 0x6f,
+	0x67, 0x2f, 0x74, 0x6f, 0x72, 0x6a, 0x75, 0x73, 0x2f, 0x65, 0x7a, 0x73, 0x68, 0x61, 0x72, 0x65,
+	0x2f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1282,7 +1348,7 @@ func file_protos_ezshare_proto_rawDescGZIP() []byte {
 }
 
 var file_protos_ezshare_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_protos_ezshare_proto_msgTypes = make([]protoimpl.MessageInfo, 20)
+var file_protos_ezshare_proto_msgTypes = make([]protoimpl.MessageInfo, 21)
 var file_protos_ezshare_proto_goTypes = []interface{}{
 	(User_Role)(0),                         // 0: ezshare.User.Role
 	(*Empty)(nil),                          // 1: ezshare.Empty
@@ -1303,20 +1369,21 @@ var file_protos_ezshare_proto_goTypes = []interface{}{
 	(*ListUsersRequest)(nil),               // 16: ezshare.ListUsersRequest
 	(*ListUsersResponse)(nil),              // 17: ezshare.ListUsersResponse
 	(*ApproveUserRequest)(nil),             // 18: ezshare.ApproveUserRequest
-	(*File_Metadata)(nil),                  // 19: ezshare.File.Metadata
+	(*ChangePasswordRequest)(nil),          // 19: ezshare.ChangePasswordRequest
-	(*ListFilesResponse_ListFileInfo)(nil), // 20: ezshare.ListFilesResponse.ListFileInfo
+	(*File_Metadata)(nil),                  // 20: ezshare.File.Metadata
-	(*timestamppb.Timestamp)(nil),          // 21: google.protobuf.Timestamp
+	(*ListFilesResponse_ListFileInfo)(nil), // 21: ezshare.ListFilesResponse.ListFileInfo
+	(*timestamppb.Timestamp)(nil),          // 22: google.protobuf.Timestamp
 }
 var file_protos_ezshare_proto_depIdxs = []int32{
-	19, // 0: ezshare.File.metadata:type_name -> ezshare.File.Metadata
+	20, // 0: ezshare.File.metadata:type_name -> ezshare.File.Metadata
-	21, // 1: ezshare.UploadFileRequest.expires_on:type_name -> google.protobuf.Timestamp
+	22, // 1: ezshare.UploadFileRequest.expires_on:type_name -> google.protobuf.Timestamp
 	2,  // 2: ezshare.GetFileResponse.file:type_name -> ezshare.File
-	20, // 3: ezshare.ListFilesResponse.files:type_name -> ezshare.ListFilesResponse.ListFileInfo
+	21, // 3: ezshare.ListFilesResponse.files:type_name -> ezshare.ListFilesResponse.ListFileInfo
 	0,  // 4: ezshare.User.user_role:type_name -> ezshare.User.Role
 	11, // 5: ezshare.ListUsersResponse.users:type_name -> ezshare.User
-	21, // 6: ezshare.File.Metadata.uploaded_on:type_name -> google.protobuf.Timestamp
+	22, // 6: ezshare.File.Metadata.uploaded_on:type_name -> google.protobuf.Timestamp
-	21, // 7: ezshare.File.Metadata.expires_on:type_name -> google.protobuf.Timestamp
+	22, // 7: ezshare.File.Metadata.expires_on:type_name -> google.protobuf.Timestamp
-	19, // 8: ezshare.ListFilesResponse.ListFileInfo.metadata:type_name -> ezshare.File.Metadata
+	20, // 8: ezshare.ListFilesResponse.ListFileInfo.metadata:type_name -> ezshare.File.Metadata
 	3,  // 9: ezshare.FileService.UploadFile:input_type -> ezshare.UploadFileRequest
 	5,  // 10: ezshare.FileService.GetFile:input_type -> ezshare.GetFileRequest
 	7,  // 11: ezshare.FileService.DeleteFile:input_type -> ezshare.DeleteFileRequest
@@ -1325,16 +1392,18 @@ var file_protos_ezshare_proto_depIdxs = []int32{
 	14, // 14: ezshare.UserService.Login:input_type -> ezshare.LoginUserRequest
 	16, // 15: ezshare.UserService.List:input_type -> ezshare.ListUsersRequest
 	18, // 16: ezshare.UserService.Approve:input_type -> ezshare.ApproveUserRequest
-	4,  // 17: ezshare.FileService.UploadFile:output_type -> ezshare.UploadFileResponse
+	19, // 17: ezshare.UserService.ChangePassword:input_type -> ezshare.ChangePasswordRequest
-	6,  // 18: ezshare.FileService.GetFile:output_type -> ezshare.GetFileResponse
+	4,  // 18: ezshare.FileService.UploadFile:output_type -> ezshare.UploadFileResponse
-	8,  // 19: ezshare.FileService.DeleteFile:output_type -> ezshare.DeleteFileResponse
+	6,  // 19: ezshare.FileService.GetFile:output_type -> ezshare.GetFileResponse
-	10, // 20: ezshare.FileService.ListFiles:output_type -> ezshare.ListFilesResponse
+	8,  // 20: ezshare.FileService.DeleteFile:output_type -> ezshare.DeleteFileResponse
-	13, // 21: ezshare.UserService.Register:output_type -> ezshare.RegisterUserResponse
+	10, // 21: ezshare.FileService.ListFiles:output_type -> ezshare.ListFilesResponse
-	15, // 22: ezshare.UserService.Login:output_type -> ezshare.LoginUserResponse
+	13, // 22: ezshare.UserService.Register:output_type -> ezshare.RegisterUserResponse
-	17, // 23: ezshare.UserService.List:output_type -> ezshare.ListUsersResponse
+	15, // 23: ezshare.UserService.Login:output_type -> ezshare.LoginUserResponse
-	1,  // 24: ezshare.UserService.Approve:output_type -> ezshare.Empty
+	17, // 24: ezshare.UserService.List:output_type -> ezshare.ListUsersResponse
-	17, // [17:25] is the sub-list for method output_type
+	1,  // 25: ezshare.UserService.Approve:output_type -> ezshare.Empty
-	9,  // [9:17] is the sub-list for method input_type
+	1,  // 26: ezshare.UserService.ChangePassword:output_type -> ezshare.Empty
+	18, // [18:27] is the sub-list for method output_type
+	9,  // [9:18] is the sub-list for method input_type
 	9,  // [9:9] is the sub-list for extension type_name
 	9,  // [9:9] is the sub-list for extension extendee
 	0,  // [0:9] is the sub-list for field type_name
@@ -1563,7 +1632,7 @@ func file_protos_ezshare_proto_init() {
 			}
 		}
 		file_protos_ezshare_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*File_Metadata); i {
+			switch v := v.(*ChangePasswordRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1575,6 +1644,18 @@ func file_protos_ezshare_proto_init() {
 			}
 		}
 		file_protos_ezshare_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*File_Metadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_protos_ezshare_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ListFilesResponse_ListFileInfo); i {
 			case 0:
 				return &v.state
@@ -1593,7 +1674,7 @@ func file_protos_ezshare_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_protos_ezshare_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   20,
+			NumMessages:   21,
 			NumExtensions: 0,
 			NumServices:   2,
 		},

pb/ezshare_grpc.pb.go

@@ -216,6 +216,7 @@ type UserServiceClient interface {
 	Login(ctx context.Context, in *LoginUserRequest, opts ...grpc.CallOption) (*LoginUserResponse, error)
 	List(ctx context.Context, in *ListUsersRequest, opts ...grpc.CallOption) (*ListUsersResponse, error)
 	Approve(ctx context.Context, in *ApproveUserRequest, opts ...grpc.CallOption) (*Empty, error)
+	ChangePassword(ctx context.Context, in *ChangePasswordRequest, opts ...grpc.CallOption) (*Empty, error)
 }
 
 type userServiceClient struct {
@@ -262,6 +263,15 @@ func (c *userServiceClient) Approve(ctx context.Context, in *ApproveUserRequest,
 	return out, nil
 }
 
+func (c *userServiceClient) ChangePassword(ctx context.Context, in *ChangePasswordRequest, opts ...grpc.CallOption) (*Empty, error) {
+	out := new(Empty)
+	err := c.cc.Invoke(ctx, "/ezshare.UserService/ChangePassword", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // UserServiceServer is the server API for UserService service.
 // All implementations must embed UnimplementedUserServiceServer
 // for forward compatibility
@@ -270,6 +280,7 @@ type UserServiceServer interface {
 	Login(context.Context, *LoginUserRequest) (*LoginUserResponse, error)
 	List(context.Context, *ListUsersRequest) (*ListUsersResponse, error)
 	Approve(context.Context, *ApproveUserRequest) (*Empty, error)
+	ChangePassword(context.Context, *ChangePasswordRequest) (*Empty, error)
 	mustEmbedUnimplementedUserServiceServer()
 }
 
@@ -289,6 +300,9 @@ func (UnimplementedUserServiceServer) List(context.Context, *ListUsersRequest) (
 func (UnimplementedUserServiceServer) Approve(context.Context, *ApproveUserRequest) (*Empty, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Approve not implemented")
 }
+func (UnimplementedUserServiceServer) ChangePassword(context.Context, *ChangePasswordRequest) (*Empty, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ChangePassword not implemented")
+}
 func (UnimplementedUserServiceServer) mustEmbedUnimplementedUserServiceServer() {}
 
 // UnsafeUserServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -374,6 +388,24 @@ func _UserService_Approve_Handler(srv interface{}, ctx context.Context, dec func
 	return interceptor(ctx, in, info, handler)
 }
 
+func _UserService_ChangePassword_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ChangePasswordRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(UserServiceServer).ChangePassword(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/ezshare.UserService/ChangePassword",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(UserServiceServer).ChangePassword(ctx, req.(*ChangePasswordRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // UserService_ServiceDesc is the grpc.ServiceDesc for UserService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -397,6 +429,10 @@ var UserService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "Approve",
 			Handler:    _UserService_Approve_Handler,
 		},
+		{
+			MethodName: "ChangePassword",
+			Handler:    _UserService_ChangePassword_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "protos/ezshare.proto",

protos/ezshare.proto

@@ -121,9 +121,17 @@ message ApproveUserRequest {
     string user_id = 1;
 }
 
+
+// Change password
+message ChangePasswordRequest {
+    string old_password = 1;
+    string new_password = 2;
+}
+
 service UserService {
     rpc Register(RegisterUserRequest) returns (RegisterUserResponse) {}
     rpc Login(LoginUserRequest) returns (LoginUserResponse) {}
     rpc List(ListUsersRequest) returns (ListUsersResponse) {}
     rpc Approve(ApproveUserRequest) returns (Empty) {}
+    rpc ChangePassword(ChangePasswordRequest) returns (Empty) {}
 }

server/interceptors/auth.go

@@ -2,7 +2,6 @@ package interceptors
 
 import (
 	"context"
-	"fmt"
 
 	"gitea.benny.dog/torjus/ezshare/pb"
 	"gitea.benny.dog/torjus/ezshare/store"
@@ -14,14 +13,15 @@ import (
 type ContextKey string
 
 var ContextKeyRole ContextKey = "role"
+var ContextKeyUserID ContextKey = "userid"
 
 func NewAuthInterceptor(s store.UserStore) grpc.UnaryServerInterceptor {
+	// TODO: Verify that cert is signed by our ca
 	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
 		p, ok := peer.FromContext(ctx)
 		if ok {
 			tlsInfo, ok := p.AuthInfo.(credentials.TLSInfo)
 			if ok {
-				fmt.Printf("%+v\n", tlsInfo.State.PeerCertificates[0].Subject.CommonName)
 				if len(tlsInfo.State.PeerCertificates) == 1 {
 					cert := tlsInfo.State.PeerCertificates[0]
 
@@ -30,6 +30,7 @@ func NewAuthInterceptor(s store.UserStore) grpc.UnaryServerInterceptor {
 					user, err := s.GetUser(id)
 					if err == nil {
 						newCtx := context.WithValue(ctx, ContextKeyRole, user.UserRole)
+						newCtx = context.WithValue(newCtx, ContextKeyUserID, user.Id)
 						return handler(newCtx, req)
 					}
 				}
@@ -53,3 +54,15 @@ func RoleFromContext(ctx context.Context) pb.User_Role {
 	}
 	return pb.User_UNKNOWN
 }
+
+func UserIDFromContext(ctx context.Context) string {
+	value := ctx.Value(ContextKeyUserID)
+	if value == nil {
+		return ""
+	}
+	id, ok := value.(string)
+	if ok {
+		return id
+	}
+	return ""
+}

server/userservice.go

@@ -6,6 +6,7 @@ import (
 
 	"gitea.benny.dog/torjus/ezshare/certs"
 	"gitea.benny.dog/torjus/ezshare/pb"
+	"gitea.benny.dog/torjus/ezshare/server/interceptors"
 	"gitea.benny.dog/torjus/ezshare/store"
 	"github.com/google/uuid"
 	"golang.org/x/crypto/bcrypt"
@@ -81,6 +82,31 @@ func (s *GRPCUserServiceServer) Approve(_ context.Context, _ *pb.ApproveUserRequ
 	return nil, status.Error(codes.Unimplemented, "not yet implemented")
 }
 
+func (s *GRPCUserServiceServer) ChangePassword(ctx context.Context, req *pb.ChangePasswordRequest) (*pb.Empty, error) {
+	// Get ID from ctx
+	userID := interceptors.UserIDFromContext(ctx)
+	if userID == "" {
+		return nil, status.Error(codes.Unauthenticated, "not authenticated")
+	}
+	user, err := s.store.GetUser(userID)
+	if err != nil {
+		return nil, status.Error(codes.Unauthenticated, "user not found")
+	}
+
+	if err := bcrypt.CompareHashAndPassword(user.HashedPassword, []byte(req.OldPassword)); err != nil {
+		return nil, status.Error(codes.Unauthenticated, "wrong password")
+	}
+	newPasswordHash, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, status.Error(codes.Internal, "unable to hash new password")
+	}
+	user.HashedPassword = newPasswordHash
+	if err := s.store.StoreUser(user); err != nil {
+		return nil, status.Error(codes.Internal, "unable to store new password")
+	}
+	return &pb.Empty{}, nil
+}
+
 func hashPassword(password string) ([]byte, error) {
 	return bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
 }