mirror of
https://github.com/Luzifer/nginx-sso.git
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141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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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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*
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*/
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package alts
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"regexp"
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"runtime"
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"strings"
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"google.golang.org/grpc/peer"
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)
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const (
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linuxProductNameFile = "/sys/class/dmi/id/product_name"
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windowsCheckCommand = "powershell.exe"
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windowsCheckCommandArgs = "Get-WmiObject -Class Win32_BIOS"
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powershellOutputFilter = "Manufacturer"
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windowsManufacturerRegex = ":(.*)"
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)
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type platformError string
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func (k platformError) Error() string {
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return fmt.Sprintf("%s is not supported", string(k))
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}
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var (
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// The following two variables will be reassigned in tests.
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runningOS = runtime.GOOS
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manufacturerReader = func() (io.Reader, error) {
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switch runningOS {
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case "linux":
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return os.Open(linuxProductNameFile)
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case "windows":
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cmd := exec.Command(windowsCheckCommand, windowsCheckCommandArgs)
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out, err := cmd.Output()
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if err != nil {
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return nil, err
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}
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for _, line := range strings.Split(strings.TrimSuffix(string(out), "\n"), "\n") {
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if strings.HasPrefix(line, powershellOutputFilter) {
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re := regexp.MustCompile(windowsManufacturerRegex)
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name := re.FindString(line)
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name = strings.TrimLeft(name, ":")
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return strings.NewReader(name), nil
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}
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}
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return nil, errors.New("cannot determine the machine's manufacturer")
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default:
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return nil, platformError(runningOS)
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}
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}
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vmOnGCP bool
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)
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// isRunningOnGCP checks whether the local system, without doing a network request is
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// running on GCP.
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func isRunningOnGCP() bool {
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manufacturer, err := readManufacturer()
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if err != nil {
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log.Fatalf("failure to read manufacturer information: %v", err)
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}
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name := string(manufacturer)
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switch runningOS {
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case "linux":
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name = strings.TrimSpace(name)
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return name == "Google" || name == "Google Compute Engine"
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case "windows":
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name = strings.Replace(name, " ", "", -1)
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name = strings.Replace(name, "\n", "", -1)
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name = strings.Replace(name, "\r", "", -1)
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return name == "Google"
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default:
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log.Fatal(platformError(runningOS))
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}
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return false
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}
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func readManufacturer() ([]byte, error) {
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reader, err := manufacturerReader()
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if err != nil {
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return nil, err
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}
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if reader == nil {
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return nil, errors.New("got nil reader")
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}
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manufacturer, err := ioutil.ReadAll(reader)
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if err != nil {
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return nil, fmt.Errorf("failed reading %v: %v", linuxProductNameFile, err)
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}
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return manufacturer, nil
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}
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// AuthInfoFromContext extracts the alts.AuthInfo object from the given context,
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// if it exists. This API should be used by gRPC server RPC handlers to get
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// information about the communicating peer. For client-side, use grpc.Peer()
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// CallOption.
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func AuthInfoFromContext(ctx context.Context) (AuthInfo, error) {
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p, ok := peer.FromContext(ctx)
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if !ok {
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return nil, errors.New("no Peer found in Context")
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}
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return AuthInfoFromPeer(p)
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}
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// AuthInfoFromPeer extracts the alts.AuthInfo object from the given peer, if it
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// exists. This API should be used by gRPC clients after obtaining a peer object
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// using the grpc.Peer() CallOption.
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func AuthInfoFromPeer(p *peer.Peer) (AuthInfo, error) {
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altsAuthInfo, ok := p.AuthInfo.(AuthInfo)
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if !ok {
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return nil, errors.New("no alts.AuthInfo found in Peer")
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}
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return altsAuthInfo, nil
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}
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