diff --git a/README.md b/README.md index 683ccae..38e99a1 100644 --- a/README.md +++ b/README.md @@ -1057,6 +1057,8 @@ curl -s -H 'Metadata-Flavor: Google' --connect-to metadata.google.internal:443:1 For an example on how the [GCE guest agent](https://github.com/GoogleCloudPlatform/guest-agent/blob/main/google_guest_agent/agentcrypto/mtls_mds.go#L136) extracts the root ca from UEFI and decrypts the client cert/key from metadata server, see [certextract.go](https://gist.github.com/salrashid123/c1de41bf380c1f9a3602675276977e48) +For an example of how to invoke the mTLS endpoint and use it with a client library, see [examples/goapp_mtls/main.go](examples/goapp_mtls/main.go) + Note that GCE issues client certificates that are rotated periodically. Infact, the client certificate is set to expire in a week: For example, the client certificate from a real GCE instance with metadata TLS shows a validity for about a week. diff --git a/examples/goapp/go.mod b/examples/goapp/go.mod index 73db2e2..0ac39df 100644 --- a/examples/goapp/go.mod +++ b/examples/goapp/go.mod @@ -3,14 +3,13 @@ module main go 1.19 require ( - cloud.google.com/go/compute/metadata v0.2.3 + cloud.google.com/go/compute/metadata v0.5.0 cloud.google.com/go/storage v1.37.0 google.golang.org/api v0.157.0 ) require ( cloud.google.com/go v0.112.0 // indirect - cloud.google.com/go/compute v1.23.3 // indirect cloud.google.com/go/iam v1.1.5 // indirect github.com/felixge/httpsnoop v1.0.4 // indirect github.com/go-logr/logr v1.4.1 // indirect @@ -31,7 +30,7 @@ require ( golang.org/x/net v0.23.0 // indirect golang.org/x/oauth2 v0.16.0 // indirect golang.org/x/sync v0.6.0 // indirect - golang.org/x/sys v0.18.0 // indirect + golang.org/x/sys v0.22.0 // indirect golang.org/x/text v0.14.0 // indirect golang.org/x/time v0.5.0 // indirect google.golang.org/appengine v1.6.8 // indirect diff --git a/examples/goapp/go.sum b/examples/goapp/go.sum index 4e0566c..9c4c060 100644 --- a/examples/goapp/go.sum +++ b/examples/goapp/go.sum @@ -1,10 +1,8 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.112.0 h1:tpFCD7hpHFlQ8yPwT3x+QeXqc2T6+n6T+hmABHfDUSM= cloud.google.com/go v0.112.0/go.mod h1:3jEEVwZ/MHU4djK5t5RHuKOA/GbLddgTdVubX1qnPD4= -cloud.google.com/go/compute v1.23.3 h1:6sVlXXBmbd7jNX0Ipq0trII3e4n1/MsADLK6a+aiVlk= -cloud.google.com/go/compute v1.23.3/go.mod h1:VCgBUoMnIVIR0CscqQiPJLAG25E3ZRZMzcFZeQ+h8CI= -cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY= -cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA= +cloud.google.com/go/compute/metadata v0.5.0 h1:Zr0eK8JbFv6+Wi4ilXAR8FJ3wyNdpxHKJNPos6LTZOY= +cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY= cloud.google.com/go/iam v1.1.5 h1:1jTsCu4bcsNsE4iiqNT5SHwrDRCfRmIaaaVFhRveTJI= cloud.google.com/go/iam v1.1.5/go.mod h1:rB6P/Ic3mykPbFio+vo7403drjlgvoWfYpJhMXEbzv8= cloud.google.com/go/storage v1.37.0 h1:WI8CsaFO8Q9KjPVtsZ5Cmi0dXV25zMoX0FklT7c3Jm4= @@ -127,8 +125,8 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4= -golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= +golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI= +golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8= golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= diff --git a/examples/goapp/main.go b/examples/goapp/main.go index 82941b4..68f214e 100644 --- a/examples/goapp/main.go +++ b/examples/goapp/main.go @@ -14,9 +14,11 @@ import ( func main() { projectID := "" + ctx := context.Background() + if metadata.OnGCE() { var err error - projectID, err = metadata.ProjectID() + projectID, err = metadata.ProjectIDWithContext(ctx) if err != nil { panic(err) } @@ -25,7 +27,6 @@ func main() { return } - ctx := context.Background() client, err := storage.NewClient(ctx) if err != nil { panic(err) @@ -50,7 +51,7 @@ func main() { } // get arbitrary metadata values directly - instanceID, err := metadata.InstanceID() + instanceID, err := metadata.InstanceIDWithContext(ctx) if err != nil { panic(err) } diff --git a/examples/goapp_mtls/go.mod b/examples/goapp_mtls/go.mod new file mode 100644 index 0000000..1a5818c --- /dev/null +++ b/examples/goapp_mtls/go.mod @@ -0,0 +1,41 @@ +module main + +go 1.19 + +require ( + cloud.google.com/go/storage v1.37.0 + golang.org/x/oauth2 v0.22.0 + google.golang.org/api v0.157.0 +) + +require ( + cloud.google.com/go v0.112.0 // indirect + cloud.google.com/go/compute/metadata v0.5.0 // indirect + cloud.google.com/go/iam v1.1.5 // indirect + github.com/felixge/httpsnoop v1.0.4 // indirect + github.com/go-logr/logr v1.4.1 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/s2a-go v0.1.7 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect + github.com/googleapis/gax-go/v2 v2.12.0 // indirect + go.opencensus.io v0.24.0 // indirect + go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.47.0 // indirect + go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.47.0 // indirect + go.opentelemetry.io/otel v1.22.0 // indirect + go.opentelemetry.io/otel/metric v1.22.0 // indirect + go.opentelemetry.io/otel/trace v1.22.0 // indirect + golang.org/x/crypto v0.21.0 // indirect + golang.org/x/net v0.23.0 // indirect + golang.org/x/sync v0.6.0 // indirect + golang.org/x/sys v0.22.0 // indirect + golang.org/x/text v0.14.0 // indirect + golang.org/x/time v0.5.0 // indirect + google.golang.org/genproto v0.0.0-20240123012728-ef4313101c80 // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20240123012728-ef4313101c80 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80 // indirect + google.golang.org/grpc v1.61.0 // indirect + google.golang.org/protobuf v1.33.0 // indirect +) diff --git a/examples/goapp_mtls/go.sum b/examples/goapp_mtls/go.sum new file mode 100644 index 0000000..9505344 --- /dev/null +++ b/examples/goapp_mtls/go.sum @@ -0,0 +1,169 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.112.0 h1:tpFCD7hpHFlQ8yPwT3x+QeXqc2T6+n6T+hmABHfDUSM= +cloud.google.com/go v0.112.0/go.mod h1:3jEEVwZ/MHU4djK5t5RHuKOA/GbLddgTdVubX1qnPD4= +cloud.google.com/go/compute/metadata v0.5.0 h1:Zr0eK8JbFv6+Wi4ilXAR8FJ3wyNdpxHKJNPos6LTZOY= +cloud.google.com/go/compute/metadata v0.5.0/go.mod h1:aHnloV2TPI38yx4s9+wAZhHykWvVCfu7hQbF+9CWoiY= +cloud.google.com/go/iam v1.1.5 h1:1jTsCu4bcsNsE4iiqNT5SHwrDRCfRmIaaaVFhRveTJI= +cloud.google.com/go/iam v1.1.5/go.mod h1:rB6P/Ic3mykPbFio+vo7403drjlgvoWfYpJhMXEbzv8= +cloud.google.com/go/storage v1.37.0 h1:WI8CsaFO8Q9KjPVtsZ5Cmi0dXV25zMoX0FklT7c3Jm4= +cloud.google.com/go/storage v1.37.0/go.mod h1:i34TiT2IhiNDmcj65PqwCjcoUX7Z5pLzS8DEmoiFq1k= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= +github.com/cncf/xds/go v0.0.0-20231109132714-523115ebc101 h1:7To3pQ+pZo0i3dsWEbinPNFs5gPSBOsJtx3wTT94VBY= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98= +github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= +github.com/envoyproxy/protoc-gen-validate v1.0.2 h1:QkIBuU5k+x7/QXPvPPnWXWlCdaBFApVqftFV6k087DA= +github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg= +github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U= +github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ= +github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag= +github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE= +github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= +github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= +github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE= +github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= +github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= +github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8= +github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA= +github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs= +github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w= +github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0= +github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8= +github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI= +github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk= +github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg= +github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY= +github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M= +github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU= +github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU= +github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI= +github.com/google/martian/v3 v3.3.2 h1:IqNFLAmvJOgVlpdEBiQbDc2EwKW77amAycfTuWKdfvw= +github.com/google/s2a-go v0.1.7 h1:60BLSyTrOV4/haCDW4zb1guZItoSq8foHCXrAnjBo/o= +github.com/google/s2a-go v0.1.7/go.mod h1:50CgR4k1jNlWBu4UfS4AcfhVe1r6pdZPygJ3R8F0Qdw= +github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= +github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= +github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= +github.com/googleapis/enterprise-certificate-proxy v0.3.2 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diff --git a/examples/goapp_mtls/main.go b/examples/goapp_mtls/main.go new file mode 100644 index 0000000..2f037e8 --- /dev/null +++ b/examples/goapp_mtls/main.go @@ -0,0 +1,171 @@ +package main + +import ( + "context" + "crypto/tls" + "crypto/x509" + "encoding/json" + "fmt" + "io" + "net" + "net/http" + "os" + "time" + + //"cloud.google.com/go/compute/metadata" + "cloud.google.com/go/storage" + "golang.org/x/oauth2" + "google.golang.org/api/iterator" + "google.golang.org/api/option" +) + +/* + +## start metadata server with mtls +go run cmd/main.go -logtostderr -alsologtostderr -v 40 -port :8080 --configFile=`pwd`/config.json \ + --serviceAccountFile certs/metadata-sa.json \ + --usemTLS --serverCert certs/server.crt --serverKey certs/server.key --rootCAmTLS certs/root.crt + + +export GCE_METADATA_HOST=localhost:8080 +go run main.go +*/ + +type gceMetadataTransport struct { + rtp http.RoundTripper + tlsConfig *tls.Config +} + +func GCEMetadataTLSTransport(tlsconfig *tls.Config) *gceMetadataTransport { + tr := &gceMetadataTransport{ + tlsConfig: tlsconfig, + } + myDialer := &net.Dialer{ + Timeout: 500 * time.Millisecond, + } + dc := func(ctx context.Context, network, address string) (net.Conn, error) { + overrideAddress := os.Getenv("GCE_METADATA_HOST") + if overrideAddress == "" { + overrideAddress = "metadata.google.internal:443" + } + return myDialer.DialContext(ctx, network, overrideAddress) + } + tr.rtp = &http.Transport{ + Proxy: http.ProxyFromEnvironment, + DialContext: dc, + TLSHandshakeTimeout: 400 * time.Millisecond, + TLSClientConfig: tr.tlsConfig, + } + return tr +} + +func (tr *gceMetadataTransport) RoundTrip(r *http.Request) (*http.Response, error) { + r.Header.Add("Metadata-Flavor", "Google") + return tr.rtp.RoundTrip(r) +} + +const ( + bucketName = "core-eso-bucket" +) + +func main() { + + ctx := context.Background() + + caCert, err := os.ReadFile("../../certs/root.crt") + if err != nil { + fmt.Printf("error reading cacert %v", err) + os.Exit(1) + } + caCertPool := x509.NewCertPool() + caCertPool.AppendCertsFromPEM(caCert) + + certs, err := tls.LoadX509KeyPair("../../certs/client.crt", "../../certs/client.key") + if err != nil { + fmt.Printf("error reading certs %v", err) + os.Exit(1) + } + + tlsconfig := &tls.Config{ + RootCAs: caCertPool, + Certificates: []tls.Certificate{certs}, + } + + client := &http.Client{ + Transport: GCEMetadataTLSTransport(tlsconfig), + } + + projectIDResp, err := client.Get("https://metadata.google.internal/computeMetadata/v1/project/project-id") + if err != nil { + fmt.Printf("error reading projectIDResp %v", err) + os.Exit(1) + } + + projectIDBytes, err := io.ReadAll(projectIDResp.Body) + if err != nil { + fmt.Printf("error reading projectIDBytes %v", err) + os.Exit(1) + } + defer projectIDResp.Body.Close() + fmt.Printf("ProjectID: %s\n", string(projectIDBytes)) + + accessTokenResp, err := client.Get("https://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token") + if err != nil { + fmt.Printf("error reading accessTokenResp %v", err) + os.Exit(1) + } + + accessTokenBytes, err := io.ReadAll(accessTokenResp.Body) + if err != nil { + fmt.Printf("error reading accessTokenBytes %v", err) + os.Exit(1) + } + defer accessTokenResp.Body.Close() + + tok := &oauth2.Token{} + err = json.Unmarshal(accessTokenBytes, tok) + if err != nil { + fmt.Println("Error in JSON oauth2Token", err) + + } + + fmt.Printf("AccessToken: %s\n", string(accessTokenBytes)) + + // note, i'm using a staticTokeSource here. + // a really easy TODO is to write custom token source which'll allow automatic acquisitions refresh of these tokens + // eg https://github.com/salrashid123/gcp_process_credentials_go/blob/main/external.go#L36 + // for example, create a + // sts, err := ComputeTokenSourceMTLS(&ComputeTokenSourceMTLSConfig{ CACert: *ca, Cert: *pub, Key: *key }) + // + sts := oauth2.StaticTokenSource(tok) + + storageClient, err := storage.NewClient(ctx, option.WithTokenSource(sts)) + if err != nil { + panic(err) + } + defer storageClient.Close() + + ctx, cancel := context.WithTimeout(ctx, time.Second*30) + defer cancel() + + it := storageClient.Bucket(bucketName).Objects(ctx, nil) + for { + oattrs, err := it.Next() + if err == iterator.Done { + break + } + if err != nil { + panic(err) + } + fmt.Printf("Bucket: %v\n", oattrs.Name) + } + + // c := metadata.NewClient(client) + // // get arbitrary metadata values directly; this won't work because the metadata package does not support client certs + // instanceID, err := c.InstanceIDWithContext(ctx) + // if err != nil { + // panic(err) + // } + // fmt.Printf("InstanceID %s\n", instanceID) + +}