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register: take control of the registration process
Till now, the attestation and communication with the elemental operator were all demanded to the github.com/rancher-sandbox/go-tpm package. Split TPM attestation from the communication with the elemental operator demanding TPM authentication to the external library while taking full control of the communication with the operator. This doesn't introduce functional changes (so it will keep retrocompatibility with the current elemental operator) and is a preparatory step to address #5 Signed-off-by: Francesco Giudici <francesco.giudici@suse.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| /* | ||
| Copyright © 2022 SUSE 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 register | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "github.com/gorilla/websocket" | ||
| "github.com/pkg/errors" | ||
| "github.com/rancher/elemental-operator/pkg/dmidecode" | ||
| "github.com/rancher/elemental-operator/pkg/tpm" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| func Register(url string, caCert []byte, smbios bool, emulatedTPM bool, emulatedSeed int64, labels map[string]string) ([]byte, error) { | ||
|
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| dialer := websocket.DefaultDialer | ||
|
|
||
| if len(caCert) > 0 { | ||
| pool, err := x509.SystemCertPool() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| pool.AppendCertsFromPEM(caCert) | ||
| dialer.TLSClientConfig = &tls.Config{RootCAs: pool} | ||
| } | ||
|
|
||
| tpmAuth := &tpm.AuthClient{} | ||
| if emulatedTPM { | ||
| logrus.Info("Starting TPM emulation") | ||
| tpmAuth.EmulateTPM(emulatedSeed) | ||
| } | ||
| authToken, tpmHash, err := tpmAuth.GetAuthToken() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot generate authentication token from TPM: %w", err) | ||
| } | ||
|
|
||
| wsURL := strings.Replace(url, "http", "ws", 1) | ||
| logrus.Infof("Using TPMHash %s to dial %s", tpmHash, wsURL) | ||
|
|
||
| header := http.Header{} | ||
| header.Add("Authorization", authToken) | ||
| if smbios { | ||
| err = addSMBIOSHeaders(&header) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("add SMBIOS headers: %w", err) | ||
| } | ||
| } | ||
| if len(labels) > 0 { | ||
| err = addLabelsHeaders(&header, labels) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("add labels in header: %w", err) | ||
| } | ||
| } | ||
|
|
||
| conn, resp, err := dialer.Dial(wsURL, header) | ||
| if err != nil { | ||
| if resp != nil { | ||
| if resp.StatusCode == http.StatusUnauthorized { | ||
| data, err := ioutil.ReadAll(resp.Body) | ||
| if err == nil { | ||
| return nil, errors.New(string(data)) | ||
| } | ||
| } else { | ||
| return nil, fmt.Errorf("%w (Status: %s)", err, resp.Status) | ||
| } | ||
| } | ||
| return nil, err | ||
| } | ||
| defer conn.Close() | ||
|
|
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| err = tpmAuth.Init(conn) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed TPM based authentication: %w", err) | ||
| } | ||
|
|
||
| _, msg, err := conn.NextReader() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("reading elemental config: %w", err) | ||
| } | ||
|
|
||
| return ioutil.ReadAll(msg) | ||
| } | ||
|
|
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| func addSMBIOSHeaders(header *http.Header) error { | ||
| data, err := dmidecode.Decode() | ||
| if err != nil { | ||
| return errors.Wrap(err, "failed to read dmidecode data") | ||
| } | ||
|
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| var buf bytes.Buffer | ||
| b64Enc := base64.NewEncoder(base64.StdEncoding, &buf) | ||
|
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| if err = json.NewEncoder(b64Enc).Encode(data); err != nil { | ||
| return errors.Wrap(err, "failed to encode dmidecode data") | ||
| } | ||
|
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| _ = b64Enc.Close() | ||
|
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| chunk := make([]byte, 875) //the chunk size | ||
| part := 1 | ||
| for { | ||
| n, err := buf.Read(chunk) | ||
| if err != nil { | ||
| if err != io.EOF { | ||
| return errors.Wrap(err, "failed to read file in chunks") | ||
| } | ||
| break | ||
| } | ||
| header.Set(fmt.Sprintf("X-Cattle-Smbios-%d", part), string(chunk[0:n])) | ||
| part++ | ||
| } | ||
| return nil | ||
| } | ||
|
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| func addLabelsHeaders(header *http.Header, labels map[string]string) error { | ||
| var buf bytes.Buffer | ||
| b64Enc := base64.NewEncoder(base64.StdEncoding, &buf) | ||
|
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| if err := json.NewEncoder(b64Enc).Encode(labels); err != nil { | ||
| return errors.Wrap(err, "failed to encode labels") | ||
| } | ||
|
|
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| _ = b64Enc.Close() | ||
| header.Set("X-Cattle-Labels", buf.String()) | ||
| return nil | ||
| } |
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