mirror of https://github.com/kubernetes/kops.git
132 lines
3.7 KiB
Go
132 lines
3.7 KiB
Go
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build linux
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// Package client provides an interface to the Intel TDX guest device commands.
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package client
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import (
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"fmt"
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"unsafe"
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"github.com/google/go-configfs-tsm/configfs/linuxtsm"
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"github.com/google/go-configfs-tsm/report"
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labi "github.com/google/go-tdx-guest/client/linuxabi"
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"golang.org/x/sys/unix"
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)
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// defaultTdxGuestDevicePath is the platform's usual device path to the TDX guest.
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const defaultTdxGuestDevicePath = "/dev/tdx_guest"
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// LinuxDevice implements the Device interface with Linux ioctls.
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type LinuxDevice struct {
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fd int
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}
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// Open opens the TDX guest device from a given path
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func (d *LinuxDevice) Open(path string) error {
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fd, err := unix.Open(path, unix.O_RDWR|unix.O_SYNC, 0)
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if err != nil {
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d.fd = -1
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return fmt.Errorf("could not open Intel TDX guest device at %q: %v", path, err)
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}
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d.fd = fd
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return nil
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}
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// OpenDevice opens the TDX guest device.
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func OpenDevice() (*LinuxDevice, error) {
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result := &LinuxDevice{}
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path := *tdxGuestPath
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if UseDefaultTdxGuestDevice() {
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path = defaultTdxGuestDevicePath
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}
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if err := result.Open(path); err != nil {
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return nil, err
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}
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return result, nil
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}
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// Close closes the TDX guest device.
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func (d *LinuxDevice) Close() error {
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if d.fd == -1 { // Not open
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return nil
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}
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if err := unix.Close(d.fd); err != nil {
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return err
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}
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// Prevent double-close.
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d.fd = -1
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return nil
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}
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// Ioctl sends a command with its wrapped request and response values to the Linux device.
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func (d *LinuxDevice) Ioctl(command uintptr, req any) (uintptr, error) {
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if d.fd == -1 {
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return 0, fmt.Errorf("intel TDX Guest Device is not open")
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}
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switch sreq := req.(type) {
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case *labi.TdxQuoteReq:
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abi := sreq.ABI()
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result, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(d.fd), command, uintptr(abi.Pointer()))
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abi.Finish(sreq)
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if errno == unix.EBUSY {
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return 0, errno
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} else if errno == unix.ENOTTY {
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return 0, fmt.Errorf("invalid ioctl! use QuoteProvider to fetch attestation quote")
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} else if errno != 0 {
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return 0, errno
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}
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return result, nil
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case *labi.TdxReportReq:
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result, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(d.fd), command, uintptr(unsafe.Pointer(req.(*labi.TdxReportReq))))
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if errno != 0 {
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return 0, errno
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}
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return result, nil
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}
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return 0, fmt.Errorf("unexpected request value: %v", req)
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}
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// LinuxConfigFsQuoteProvider implements the QuoteProvider interface to fetch
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// attestation quote via ConfigFS.
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type LinuxConfigFsQuoteProvider struct{}
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// IsSupported checks if TSM client can be created to use ConfigFS system.
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func (p *LinuxConfigFsQuoteProvider) IsSupported() error {
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_, err := linuxtsm.MakeClient()
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return err
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}
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// GetRawQuote returns byte format attestation quote via ConfigFS.
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func (p *LinuxConfigFsQuoteProvider) GetRawQuote(reportData [64]byte) ([]uint8, error) {
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req := &report.Request{
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InBlob: reportData[:],
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GetAuxBlob: false,
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}
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resp, err := linuxtsm.GetReport(req)
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if err != nil {
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return nil, err
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}
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tdReport := resp.OutBlob
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return tdReport, nil
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}
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// GetQuoteProvider returns an instance of LinuxConfigFsQuoteProvider.
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func GetQuoteProvider() (*LinuxConfigFsQuoteProvider, error) {
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return &LinuxConfigFsQuoteProvider{}, nil
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}
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