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serve.go
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serve.go
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package main
import (
"bytes"
"context"
"crypto/subtle"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"flag"
"fmt"
"io"
"io/ioutil"
stdlog "log"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/RobotsAndPencils/buford/push"
"github.com/boltdb/bolt"
"github.com/fullsailor/pkcs7"
"github.com/go-kit/kit/auth/basic"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
httptransport "github.com/go-kit/kit/transport/http"
"github.com/groob/finalizer/logutil"
"github.com/micromdm/dep"
"github.com/micromdm/go4/env"
"github.com/micromdm/go4/httputil"
"github.com/micromdm/go4/version"
boltdepot "github.com/micromdm/scep/depot/bolt"
scep "github.com/micromdm/scep/server"
"github.com/pkg/errors"
"golang.org/x/crypto/acme/autocert"
"golang.org/x/crypto/pkcs12"
"github.com/micromdm/micromdm/dep/depsync"
"github.com/micromdm/micromdm/mdm"
"github.com/micromdm/micromdm/mdm/enroll"
"github.com/micromdm/micromdm/pkg/crypto"
httputil2 "github.com/micromdm/micromdm/pkg/httputil"
"github.com/micromdm/micromdm/platform/apns"
apnsbuiltin "github.com/micromdm/micromdm/platform/apns/builtin"
"github.com/micromdm/micromdm/platform/appstore"
appsbuiltin "github.com/micromdm/micromdm/platform/appstore/builtin"
"github.com/micromdm/micromdm/platform/blueprint"
blueprintbuiltin "github.com/micromdm/micromdm/platform/blueprint/builtin"
"github.com/micromdm/micromdm/platform/command"
"github.com/micromdm/micromdm/platform/config"
configbuiltin "github.com/micromdm/micromdm/platform/config/builtin"
depapi "github.com/micromdm/micromdm/platform/dep"
"github.com/micromdm/micromdm/platform/device"
devicebuiltin "github.com/micromdm/micromdm/platform/device/builtin"
"github.com/micromdm/micromdm/platform/profile"
profilebuiltin "github.com/micromdm/micromdm/platform/profile/builtin"
"github.com/micromdm/micromdm/platform/pubsub"
"github.com/micromdm/micromdm/platform/pubsub/inmem"
"github.com/micromdm/micromdm/platform/queue"
block "github.com/micromdm/micromdm/platform/remove"
blockbuiltin "github.com/micromdm/micromdm/platform/remove/builtin"
"github.com/micromdm/micromdm/platform/user"
userbuiltin "github.com/micromdm/micromdm/platform/user/builtin"
"github.com/micromdm/micromdm/workflow/webhook"
)
const homePage = `<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>MicroMDM</title>
<style>
body {
font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}
</style>
</head>
<body>
<h3>Welcome to MicroMDM!</h3>
<p><a href="mdm/enroll">Enroll a device</a></p>
</body>
</html>
`
func serve(args []string) error {
flagset := flag.NewFlagSet("serve", flag.ExitOnError)
var (
flConfigPath = flagset.String("config-path", "/var/db/micromdm", "path to configuration directory")
flServerURL = flagset.String("server-url", "", "public HTTPS url of your server")
flAPIKey = flagset.String("api-key", env.String("MICROMDM_API_KEY", ""), "API Token for mdmctl command")
flAPNSCertPath = flagset.String("apns-cert", "", "path to APNS certificate")
flAPNSKeyPass = flagset.String("apns-password", env.String("MICROMDM_APNS_KEY_PASSWORD", ""), "password for your p12 APNS cert file (if using)")
flAPNSKeyPath = flagset.String("apns-key", "", "path to key file if using .pem push cert")
flTLS = flagset.Bool("tls", true, "use https")
flTLSCert = flagset.String("tls-cert", "", "path to TLS certificate")
flTLSKey = flagset.String("tls-key", "", "path to TLS private key")
flHTTPAddr = flagset.String("http-addr", ":https", "http(s) listen address of mdm server. defaults to :8080 if tls is false")
flHTTPDebug = flagset.Bool("http-debug", false, "enable debug for http(dumps full request)")
flRepoPath = flagset.String("filerepo", "", "path to http file repo")
flDepSim = flagset.String("depsim", "", "use depsim URL")
flExamples = flagset.Bool("examples", false, "prints some example usage")
flCommandWebhookURL = flagset.String("command-webhook-url", "", "URL to send command responses.")
flHomePage = flagset.Bool("homepage", true, "hosts a simple built-in webpage at the / address")
)
flagset.Usage = usageFor(flagset, "micromdm serve [flags]")
if err := flagset.Parse(args); err != nil {
return err
}
if *flExamples {
printExamples()
return nil
}
if *flServerURL == "" {
return errors.New("must supply -server-url")
}
if !strings.HasPrefix(*flServerURL, "https://") {
return errors.New("-server-url must begin with https://")
}
if !*flTLS && (*flTLSCert != "" || *flTLSKey != "") {
return errors.New("cannot set -tls=false and supply -tls-cert or -tls-key")
}
if *flAPNSCertPath != "" || *flAPNSKeyPass != "" || *flAPNSKeyPath != "" {
stdlog.Println("-apns-cert, -apns-password, and -apns-key switches are deprecated. please transition to `mdmctl mdmcert upload` instead")
}
logger := log.NewLogfmtLogger(os.Stderr)
stdlog.SetOutput(log.NewStdlibAdapter(logger)) // force structured logs
mainLogger := log.With(logger, "component", "main")
mainLogger.Log("msg", "started")
if err := os.MkdirAll(*flConfigPath, 0755); err != nil {
return errors.Wrapf(err, "creating config directory %s", *flConfigPath)
}
sm := &server{
configPath: *flConfigPath,
ServerPublicURL: strings.TrimRight(*flServerURL, "/"),
APNSCertificatePath: *flAPNSCertPath,
APNSPrivateKeyPass: *flAPNSKeyPass,
APNSPrivateKeyPath: *flAPNSKeyPath,
depsim: *flDepSim,
tlsCertPath: *flTLSCert,
CommandWebhookURL: *flCommandWebhookURL,
webhooksHTTPClient: &http.Client{Timeout: time.Second * 30},
// TODO: we have a static SCEP challenge password here to prevent
// being prompted for the SCEP challenge which happens in a "normal"
// (non-DEP) enrollment. While security is not improved it is at least
// no less secure and prevents a useless dialog from showing.
SCEPChallenge: "micromdm",
}
sm.setupPubSub()
sm.setupBolt()
sm.setupRemoveService()
sm.setupConfigStore()
sm.loadPushCerts()
sm.setupSCEP(logger)
sm.setupPushService(logger)
sm.setupCommandService()
sm.setupWebhooks(logger)
sm.setupCommandQueue(logger)
sm.setupDepClient()
syncer := sm.setupDEPSync(logger)
if sm.err != nil {
stdlog.Fatal(sm.err)
}
var removeService block.Service
{
svc, err := block.New(sm.removeDB)
if err != nil {
stdlog.Fatal(err)
}
removeService = block.LoggingMiddleware(logger)(svc)
}
devDB, err := devicebuiltin.NewDB(sm.db)
if err != nil {
stdlog.Fatal(err)
}
devWorker := device.NewWorker(devDB, sm.pubclient, logger)
go devWorker.Run(context.Background())
userDB, err := userbuiltin.NewDB(sm.db)
if err != nil {
stdlog.Fatal(err)
}
userWorker := user.NewWorker(userDB, sm.pubclient, logger)
go userWorker.Run(context.Background())
sm.profileDB, err = profilebuiltin.NewDB(sm.db)
if err != nil {
stdlog.Fatal(err)
}
sm.setupEnrollmentService()
if sm.err != nil {
stdlog.Fatalf("enrollment service: %s", sm.err)
}
bpDB, err := blueprintbuiltin.NewDB(sm.db, sm.profileDB, userDB)
if err != nil {
stdlog.Fatal(err)
}
if err := bpDB.StartListener(sm.pubclient, sm.commandService); err != nil {
stdlog.Fatal(err)
}
ctx := context.Background()
httpLogger := log.With(logger, "transport", "http")
dc := sm.depClient
appDB := &appsbuiltin.Repo{Path: *flRepoPath}
scepHandler := scep.ServiceHandler(ctx, sm.scepService, httpLogger)
enrollHandlers := enroll.MakeHTTPHandlers(ctx, enroll.MakeServerEndpoints(sm.enrollService, sm.scepDepot), httptransport.ServerErrorLogger(httpLogger))
r, options := httputil2.NewRouter(logger)
r.Handle("/version", version.Handler())
r.Handle("/mdm/enroll", enrollHandlers.EnrollHandler).Methods("GET", "POST")
r.Handle("/ota/enroll", enrollHandlers.OTAEnrollHandler)
r.Handle("/ota/phase23", enrollHandlers.OTAPhase2Phase3Handler).Methods("POST")
r.Handle("/scep", scepHandler)
if *flHomePage {
r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, homePage)
})
}
signatureVerifier := &mdmSignatureVerifier{db: sm.scepDepot}
mdmEndpoints := mdm.MakeServerEndpoints(sm.mdmService)
mdm.RegisterHTTPHandlers(r, mdmEndpoints, signatureVerifier, logger)
// API commands. Only handled if the user provides an api key.
if *flAPIKey != "" {
basicAuthEndpointMiddleware := basic.AuthMiddleware("micromdm", *flAPIKey, "micromdm")
configsvc := config.New(sm.configDB)
configEndpoints := config.MakeServerEndpoints(configsvc, basicAuthEndpointMiddleware)
config.RegisterHTTPHandlers(r, configEndpoints, options...)
apnsEndpoints := apns.MakeServerEndpoints(sm.pushService, basicAuthEndpointMiddleware)
apns.RegisterHTTPHandlers(r, apnsEndpoints, options...)
devicesvc := device.New(devDB)
deviceEndpoints := device.MakeServerEndpoints(devicesvc, basicAuthEndpointMiddleware)
device.RegisterHTTPHandlers(r, deviceEndpoints, options...)
profilesvc := profile.New(sm.profileDB)
profileEndpoints := profile.MakeServerEndpoints(profilesvc, basicAuthEndpointMiddleware)
profile.RegisterHTTPHandlers(r, profileEndpoints, options...)
blueprintsvc := blueprint.New(bpDB)
blueprintEndpoints := blueprint.MakeServerEndpoints(blueprintsvc, basicAuthEndpointMiddleware)
blueprint.RegisterHTTPHandlers(r, blueprintEndpoints, options...)
blockEndpoints := block.MakeServerEndpoints(removeService, basicAuthEndpointMiddleware)
block.RegisterHTTPHandlers(r, blockEndpoints, options...)
usersvc := user.New(userDB)
userEndpoints := user.MakeServerEndpoints(usersvc, basicAuthEndpointMiddleware)
user.RegisterHTTPHandlers(r, userEndpoints, options...)
appsvc := appstore.New(appDB)
appEndpoints := appstore.MakeServerEndpoints(appsvc, basicAuthEndpointMiddleware)
appstore.RegisterHTTPHandlers(r, appEndpoints, options...)
commandEndpoints := command.MakeServerEndpoints(sm.commandService, basicAuthEndpointMiddleware)
command.RegisterHTTPHandlers(r, commandEndpoints, options...)
depsvc := depapi.New(dc, sm.pubclient)
depEndpoints := depapi.MakeServerEndpoints(depsvc, basicAuthEndpointMiddleware)
depapi.RegisterHTTPHandlers(r, depEndpoints, options...)
depsyncEndpoints := depsync.MakeServerEndpoints(depsync.NewService(syncer), basicAuthEndpointMiddleware)
depsync.RegisterHTTPHandlers(r, depsyncEndpoints, options...)
} else {
mainLogger.Log("msg", "no api key specified")
}
if *flRepoPath != "" {
if _, err := os.Stat(*flRepoPath); os.IsNotExist(err) {
stdlog.Fatal(err)
}
r.PathPrefix("/repo/").Handler(http.StripPrefix("/repo/", http.FileServer(http.Dir(*flRepoPath))))
}
var handler http.Handler
if *flHTTPDebug {
handler = httputil.HTTPDebugMiddleware(os.Stdout, true, logger.Log)(r)
} else {
handler = r
}
handler = logutil.NewHTTPLogger(httpLogger).Middleware(handler)
srvURL, err := url.Parse(sm.ServerPublicURL)
if err != nil {
return errors.Wrapf(err, "parsing serverURL %q", sm.ServerPublicURL)
}
serveOpts := serveOptions(
handler,
*flHTTPAddr,
srvURL.Hostname(),
logger,
*flTLSCert,
*flTLSKey,
sm.configPath,
*flTLS,
)
err = httputil.ListenAndServe(serveOpts...)
return errors.Wrap(err, "calling ListenAndServe")
}
// serveOptions configures the []httputil.Options for ListenAndServe
func serveOptions(
handler http.Handler,
addr string,
hostname string,
logger log.Logger,
certPath string,
keyPath string,
configPath string,
tls bool,
) []httputil.Option {
tlsFromFile := (certPath != "" && keyPath != "")
serveOpts := []httputil.Option{
httputil.WithACMEHosts([]string{hostname}),
httputil.WithLogger(logger),
httputil.WithHTTPHandler(handler),
}
if tlsFromFile {
serveOpts = append(serveOpts, httputil.WithKeyPair(certPath, keyPath))
}
if !tls && addr == ":https" {
serveOpts = append(serveOpts, httputil.WithAddress(":8080"))
}
if tls {
serveOpts = append(serveOpts, httputil.WithAutocertCache(autocert.DirCache(filepath.Join(configPath, "le-certificates"))))
}
if addr != ":https" {
serveOpts = append(serveOpts, httputil.WithAddress(addr))
}
return serveOpts
}
func printExamples() {
const exampleText = `
Quickstart:
sudo micromdm serve -apns-cert /path/to/mdm_push_cert.p12 -apns-password=password_for_p12 -server-url=https://my-server-url
Using self-signed certs:
*Note, -apns flags are still required!*
sudo micromdm serve -tls-cert=/path/to/server.crt -tls-key=/path/to/server.key
`
fmt.Println(exampleText)
}
type server struct {
configPath string
depsim string
pubclient pubsub.PublishSubscriber
db *bolt.DB
pushCert pushServiceCert
ServerPublicURL string
SCEPChallenge string
APNSPrivateKeyPath string
APNSCertificatePath string
APNSPrivateKeyPass string
tlsCertPath string
scepDepot *boltdepot.Depot
profileDB profile.Store
configDB config.Store
removeDB block.Store
CommandWebhookURL string
depClient dep.Client
// TODO: refactor enroll service and remove the need to reference
// this on-disk cert. but it might be useful to keep the PEM
// around for anyone who will need to export the CA.
scepCACertPath string
PushService *push.Service // bufford push
pushService apns.Service
mdmService mdm.Service
enrollService enroll.Service
scepService scep.Service
commandService command.Service
configService config.Service
webhooksHTTPClient *http.Client
err error
}
func (c *server) setupPubSub() {
if c.err != nil {
return
}
c.pubclient = inmem.NewPubSub()
}
func (c *server) setupCommandService() {
if c.err != nil {
return
}
c.commandService, c.err = command.New(c.pubclient)
}
func (c *server) setupWebhooks(logger log.Logger) {
if c.err != nil {
return
}
if c.CommandWebhookURL == "" {
return
}
ctx := context.Background()
ww := webhook.New(c.CommandWebhookURL, c.pubclient, webhook.WithLogger(logger), webhook.WithHTTPClient(c.webhooksHTTPClient))
go ww.Run(ctx)
}
func (c *server) setupRemoveService() {
if c.err != nil {
return
}
removeDB, err := blockbuiltin.NewDB(c.db)
if err != nil {
c.err = err
return
}
c.removeDB = removeDB
}
func (c *server) setupCommandQueue(logger log.Logger) {
if c.err != nil {
return
}
q, err := queue.NewQueue(c.db, c.pubclient)
if err != nil {
c.err = err
return
}
var mdmService mdm.Service
{
svc := mdm.NewService(c.pubclient, q)
mdmService = svc
mdmService = block.RemoveMiddleware(c.removeDB)(mdmService)
}
c.mdmService = mdmService
}
func (c *server) setupBolt() {
if c.err != nil {
return
}
dbPath := filepath.Join(c.configPath, "micromdm.db")
db, err := bolt.Open(dbPath, 0644, &bolt.Options{Timeout: time.Second})
if err != nil {
c.err = errors.Wrap(err, "opening boltdb")
return
}
c.db = db
}
func (c *server) loadPushCerts() {
if c.APNSCertificatePath == "" && c.APNSPrivateKeyPass == "" && c.APNSPrivateKeyPath == "" {
// this is optional, config could also be provided with mdmctl
return
}
if c.err != nil {
return
}
if c.APNSPrivateKeyPath == "" {
var pkcs12Data []byte
pkcs12Data, c.err = ioutil.ReadFile(c.APNSCertificatePath)
if c.err != nil {
return
}
c.pushCert.PrivateKey, c.pushCert.Certificate, c.err =
pkcs12.Decode(pkcs12Data, c.APNSPrivateKeyPass)
return
}
c.pushCert.Certificate, c.err = crypto.ReadPEMCertificateFile(c.APNSCertificatePath)
if c.err != nil {
return
}
var pemData []byte
pemData, c.err = ioutil.ReadFile(c.APNSPrivateKeyPath)
if c.err != nil {
return
}
pkeyBlock := new(bytes.Buffer)
pemBlock, _ := pem.Decode(pemData)
if pemBlock == nil {
c.err = errors.New("invalid PEM data for privkey")
return
}
if x509.IsEncryptedPEMBlock(pemBlock) {
b, err := x509.DecryptPEMBlock(pemBlock, []byte(c.APNSPrivateKeyPass))
if err != nil {
c.err = fmt.Errorf("decrypting DES private key %s", err)
return
}
pkeyBlock.Write(b)
} else {
pkeyBlock.Write(pemBlock.Bytes)
}
priv, err := x509.ParsePKCS1PrivateKey(pkeyBlock.Bytes())
if err != nil {
c.err = fmt.Errorf("parsing pkcs1 private key: %s", err)
return
}
c.pushCert.PrivateKey = priv
}
type pushServiceCert struct {
*x509.Certificate
PrivateKey interface{}
}
func (c *server) setupConfigStore() {
if c.err != nil {
return
}
db, err := configbuiltin.NewDB(c.db, c.pubclient)
if err != nil {
c.err = err
return
}
c.configDB = db
c.configService = config.New(db)
}
func (c *server) setupPushService(logger log.Logger) {
if c.err != nil {
return
}
var opts []apns.Option
{
cert, _ := c.configDB.PushCertificate()
if c.pushCert.Certificate != nil && cert == nil {
cert = &tls.Certificate{
Certificate: [][]byte{c.pushCert.Certificate.Raw},
PrivateKey: c.pushCert.PrivateKey,
Leaf: c.pushCert.Certificate,
}
}
if cert == nil {
goto after
}
client, err := push.NewClient(*cert)
if err != nil {
c.err = err
return
}
svc := push.NewService(client, push.Production)
opts = append(opts, apns.WithPushService(svc))
}
after:
db, err := apnsbuiltin.NewDB(c.db, c.pubclient)
if err != nil {
c.err = err
return
}
service, err := apns.New(db, c.configDB, c.pubclient, opts...)
if err != nil {
c.err = errors.Wrap(err, "starting micromdm push service")
return
}
c.pushService = apns.LoggingMiddleware(
log.With(level.Info(logger), "component", "apns"),
)(service)
}
func (c *server) setupEnrollmentService() {
if c.err != nil {
return
}
var topicProvider enroll.TopicProvider
if c.pushCert.Certificate != nil {
pushTopic, err := crypto.TopicFromCert(c.pushCert.Certificate)
if err != nil {
c.err = errors.Wrap(err, "get apns topic from certificate")
return
}
topicProvider = staticTopicProvider{topic: pushTopic}
} else {
topicProvider = c.configDB
}
var SCEPCertificateSubject string
// TODO: clean up order of inputs. Maybe pass *SCEPConfig as an arg?
// but if you do, the packages are coupled, better not.
c.enrollService, c.err = enroll.NewService(
topicProvider,
c.pubclient,
c.scepCACertPath,
c.ServerPublicURL+"/scep",
c.SCEPChallenge,
c.ServerPublicURL,
c.tlsCertPath,
SCEPCertificateSubject,
c.profileDB,
)
}
// if the apns-cert flags are specified this provider will be used in the enroll service.
type staticTopicProvider struct{ topic string }
func (p staticTopicProvider) PushTopic() (string, error) {
return p.topic, nil
}
func (c *server) setupDepClient() (dep.Client, error) {
if c.err != nil {
return nil, c.err
}
// depsim config
depsim := c.depsim
var conf *dep.Config
// try getting the oauth config from bolt
tokens, err := c.configDB.DEPTokens()
if err != nil {
return nil, err
}
if len(tokens) >= 1 {
conf = new(dep.Config)
conf.ConsumerSecret = tokens[0].ConsumerSecret
conf.ConsumerKey = tokens[0].ConsumerKey
conf.AccessSecret = tokens[0].AccessSecret
conf.AccessToken = tokens[0].AccessToken
// TODO: handle expiration
}
// override with depsim keys if specified on CLI
if depsim != "" {
conf = &dep.Config{
ConsumerKey: "CK_48dd68d198350f51258e885ce9a5c37ab7f98543c4a697323d75682a6c10a32501cb247e3db08105db868f73f2c972bdb6ae77112aea803b9219eb52689d42e6",
ConsumerSecret: "CS_34c7b2b531a600d99a0e4edcf4a78ded79b86ef318118c2f5bcfee1b011108c32d5302df801adbe29d446eb78f02b13144e323eb9aad51c79f01e50cb45c3a68",
AccessToken: "AT_927696831c59ba510cfe4ec1a69e5267c19881257d4bca2906a99d0785b785a6f6fdeb09774954fdd5e2d0ad952e3af52c6d8d2f21c924ba0caf4a031c158b89",
AccessSecret: "AS_c31afd7a09691d83548489336e8ff1cb11b82b6bca13f793344496a556b1f4972eaff4dde6deb5ac9cf076fdfa97ec97699c34d515947b9cf9ed31c99dded6ba",
}
}
if conf == nil {
return nil, nil
}
depServerURL := "https://mdmenrollment.apple.com"
if depsim != "" {
depServerURL = depsim
}
client, err := dep.NewClient(conf, dep.ServerURL(depServerURL))
if err != nil {
return nil, err
}
c.depClient = client
return client, nil
}
func (c *server) setupDEPSync(logger log.Logger) depsync.Syncer {
if c.err != nil {
return nil
}
client := c.depClient
opts := []depsync.Option{
depsync.WithLogger(log.With(logger, "component", "depsync")),
}
if client != nil {
opts = append(opts, depsync.WithClient(client))
}
var syncer depsync.Syncer
syncer, c.err = depsync.New(c.pubclient, c.db, logger, opts...)
if c.err != nil {
return nil
}
return syncer
}
func (c *server) setupSCEP(logger log.Logger) {
if c.err != nil {
return
}
depot, err := boltdepot.NewBoltDepot(c.db)
if err != nil {
c.err = err
return
}
key, err := depot.CreateOrLoadKey(2048)
if err != nil {
c.err = err
return
}
caCert, err := depot.CreateOrLoadCA(key, 5, "MicroMDM", "US")
if err != nil {
c.err = err
return
}
c.scepCACertPath = filepath.Join(c.configPath, "SCEPCACert.pem")
c.err = crypto.WritePEMCertificateFile(caCert, c.scepCACertPath)
if c.err != nil {
return
}
opts := []scep.ServiceOption{
scep.ClientValidity(365),
scep.ChallengePassword(c.SCEPChallenge),
}
c.scepDepot = depot
c.scepService, c.err = scep.NewService(depot, opts...)
if c.err == nil {
c.scepService = scep.NewLoggingService(logger, c.scepService)
}
}
type mdmSignatureVerifier struct {
db *boltdepot.Depot
}
func (v *mdmSignatureVerifier) VerifySignature(b64sig string, message []byte) error {
if b64sig == "" {
return errors.New("signature missing")
}
sig, err := base64.StdEncoding.DecodeString(b64sig)
if err != nil {
return errors.Wrap(err, "decode MDM SignMessage header")
}
p7, err := pkcs7.Parse(sig)
if err != nil {
return errors.Wrap(err, "parse MDM SignMessage signature")
}
p7.Content = message
if err := p7.Verify(); err != nil {
return errors.Wrap(err, "verify MDM Signed Message")
}
cert := p7.GetOnlySigner()
if cert == nil {
return errors.New("invalid signer")
}
hasCN, err := HasCN(v.db, cert.Subject.CommonName, 0, cert, false)
if err != nil {
return errors.Wrap(err, "unable to validate signature")
}
if !hasCN {
return errors.Wrap(err, "Unauthorized client")
}
return nil
}
// implement HasCN function that belongs in micromdm/scep/depot/bolt
// note: added bool return, different from micromdm/scep interface
func HasCN(db *boltdepot.Depot, cn string, allowTime int, cert *x509.Certificate, revokeOldCertificate bool) (bool, error) {
// TODO: implement allowTime
// TODO: implement revocation
if cert == nil {
return false, errors.New("nil certificate provided")
}
var hasCN bool
err := db.View(func(tx *bolt.Tx) error {
// TODO: "scep_certificates" is internal const in micromdm/scep
bucket := tx.Bucket([]byte("scep_certificates"))
certKey := []byte(cert.Subject.CommonName + "." + cert.SerialNumber.String())
certCandidate := bucket.Get(certKey)
if certCandidate != nil {
hasCN = 1 == subtle.ConstantTimeCompare(certCandidate, cert.Raw)
}
return nil
})
return hasCN, err
}