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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package main implements a CLI tool for collecting attestation reports.
package main
import (
"encoding/base64"
"encoding/hex"
"flag"
"fmt"
"io"
"os"
"strings"
"unicode/utf8"
"github.com/google/go-tdx-guest/client"
labi "github.com/google/go-tdx-guest/client/linuxabi"
pb "github.com/google/go-tdx-guest/proto/tdx"
"github.com/google/logger"
"google.golang.org/protobuf/encoding/prototext"
)
var (
outform = flag.String("outform", "bin",
"The format of the output attestation report. "+
"One of \"bin\", \"textproto\".")
reportDataStr = flag.String("in", "",
"A string of 64 bytes REPORT_DATA to include in the output attestation. "+
"REPORT_DATA can be either in base64 or hex format. If -inform=auto, first check with base64, hex and last with auto.")
inform = flag.String("inform", "auto", "The format of the reportData input. One of base64, hex and auto. "+
"If -inform=auto, first check with base64 and last with hex.")
out = flag.String("out", "", "Path to output file to write attestation report to. "+
"If unset, outputs to stdout.")
verbose = flag.Bool("v", false, "Enable verbose logging.")
verbosity = flag.Int("verbosity", 0, "The output verbosity. Higher number means more verbose output")
)
func outputReport(data [labi.TdReportDataSize]byte, out io.Writer) error {
tdxQuoteProvider, err := client.GetQuoteProvider()
if err != nil {
return err
}
if *outform == "bin" {
bytes, err := client.GetRawQuote(tdxQuoteProvider, data)
if err != nil {
return err
}
out.Write(bytes)
return nil
}
quote, err := client.GetQuote(tdxQuoteProvider, data)
if err != nil {
return err
}
return marshalAndWriteBytes(quote, out)
}
func marshalAndWriteBytes(quote any, out io.Writer) error {
switch q := quote.(type) {
case *pb.QuoteV4:
bytes, err := prototext.Marshal(q)
if err != nil {
return err
}
out.Write(bytes)
return nil
default:
return fmt.Errorf("unsupported quote type: %T", quote)
}
}
func outWriter() (io.Writer, *os.File, error) {
if *out == "" {
return os.Stdout, nil, nil
}
file, err := os.Create(*out)
if err != nil {
return nil, nil, err
}
return file, file, nil
}
func sizedBytes(flag, value string, byteSize int, decode func(string) ([]byte, error)) ([]byte, error) {
bytes, err := decode(value)
if err != nil {
return nil, fmt.Errorf("%s=%s could not be decoded: %v", flag, value, err)
}
if len(bytes) > byteSize {
return nil, fmt.Errorf("%s=%s (%v) is not representable in %d bytes", flag, value, bytes, byteSize)
}
sized := make([]byte, byteSize)
copy(sized, bytes)
return sized, nil
}
func parseBytes(name string, in io.Reader, inform string, byteSize int) ([]byte, error) {
inbytes, err := io.ReadAll(in)
if err != nil {
return nil, err
}
if len(inbytes) == 0 {
return nil, nil
}
inByteStr := strings.TrimSpace(string(inbytes))
if !utf8.ValidString(inByteStr) {
return nil, fmt.Errorf("could not decode %s contents as a UTF-8 string", name)
}
switch inform {
case "base64":
return sizedBytes(name, inByteStr, byteSize, base64.StdEncoding.DecodeString)
case "hex":
return sizedBytes(name, inByteStr, byteSize, hex.DecodeString)
case "auto":
// "auto" means to try base64 encoding first, then hex.
if b, err := sizedBytes(name, inByteStr, byteSize, base64.StdEncoding.DecodeString); err == nil {
return b, nil
}
return sizedBytes(name, inByteStr, byteSize, hex.DecodeString)
default:
return nil, fmt.Errorf("-inform should be either base64 or hex")
}
}
func main() {
flag.Parse()
logger.Init("", *verbose, false, os.Stderr)
logger.SetLevel(logger.Level(*verbosity))
reportData, err := parseBytes("-in", strings.NewReader(*reportDataStr), *inform, labi.TdReportDataSize)
if err != nil {
logger.Fatal(err)
}
if !(*outform == "bin" || *outform == "textproto") {
logger.Fatalf("-outform is %s. Expect \"bin\" or \"textproto\"", *outform)
}
outwriter, filetoclose, err := outWriter()
if err != nil {
logger.Fatalf("failed to open output file: %v", err)
}
defer func() {
if filetoclose != nil {
filetoclose.Close()
}
}()
var reportData64 [labi.TdReportDataSize]byte
copy(reportData64[:], reportData)
if err := outputReport(reportData64, outwriter); err != nil {
logger.Fatal(err)
}
}
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