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//go:build !windows
// Copyright (c) 2014, Google LLC All rights reserved.
//
// 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
import (
"crypto/sha1"
"flag"
"fmt"
"os"
"github.com/google/go-tpm/tpm"
)
var (
ownerAuthEnvVar = "TPM_OWNER_AUTH"
srkAuthEnvVar = "TPM_SRK_AUTH"
)
func main() {
var tpmname = flag.String("tpm", "/dev/tpm0", "The path to the TPM device to use")
flag.Parse()
rwc, err := tpm.OpenTPM(*tpmname)
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't open the TPM file %s: %s\n", *tpmname, err)
return
}
// Compute the auth values as needed.
var ownerAuth [20]byte
ownerInput := os.Getenv(ownerAuthEnvVar)
if ownerInput != "" {
oa := sha1.Sum([]byte(ownerInput))
copy(ownerAuth[:], oa[:])
}
var srkAuth [20]byte
srkInput := os.Getenv(srkAuthEnvVar)
if srkInput != "" {
sa := sha1.Sum([]byte(srkInput))
copy(srkAuth[:], sa[:])
}
pubEK, err := tpm.ReadPubEK(rwc)
if err != nil {
fmt.Fprintf(os.Stderr, "Couldn't read the endorsement key: %s\n", err)
return
}
if err := tpm.TakeOwnership(rwc, ownerAuth, srkAuth, pubEK); err != nil {
fmt.Fprintf(os.Stderr, "Couldn't take ownership of the TPM: %s\n", err)
return
}
return
}
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