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Merge pull request #4 from smallstep/attest
Add step-kms-plugin attest command
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| // Copyright 2022 Smallstep Labs, Inc. | ||
| // | ||
| // 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 cmd | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/pem" | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
|
|
||
| "github.com/smallstep/step-kms-plugin/internal/flagutil" | ||
| "github.com/spf13/cobra" | ||
| "go.step.sm/crypto/kms" | ||
| "go.step.sm/crypto/kms/apiv1" | ||
| "go.step.sm/crypto/pemutil" | ||
| ) | ||
|
|
||
| // attestCmd represents the attest command | ||
| var attestCmd = &cobra.Command{ | ||
| Use: "attest <uri>", | ||
| Short: "create an attestation certificate", | ||
| Long: `This command, if the KMS supports it, it prints an attestation certificate or an endorsement key. | ||
| Currently this command is only supported on YubiKeys.`, | ||
| Example: ` # Get the attestation certificate from a YubiKey: | ||
| step-kms-plugin attest yubikey:slot-id=9c`, | ||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| if len(args) != 1 { | ||
| return showUsageErr(cmd) | ||
| } | ||
|
|
||
| flags := cmd.Flags() | ||
| kuri := flagutil.MustString(flags, "kms") | ||
| if kuri == "" { | ||
| kuri = args[0] | ||
| } | ||
|
|
||
| km, err := kms.New(context.Background(), apiv1.Options{ | ||
| URI: kuri, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to load key manager: %w", err) | ||
| } | ||
| defer km.Close() | ||
|
|
||
| attester, ok := km.(apiv1.Attester) | ||
| if !ok { | ||
| return fmt.Errorf("%s does not implement Attester", kuri) | ||
| } | ||
|
|
||
| resp, err := attester.CreateAttestation(&apiv1.CreateAttestationRequest{ | ||
| Name: args[0], | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to attest: %w", err) | ||
| } | ||
|
|
||
| switch { | ||
| case resp.Certificate != nil: | ||
| if err := pem.Encode(os.Stdout, &pem.Block{ | ||
| Type: "CERTIFICATE", | ||
| Bytes: resp.Certificate.Raw, | ||
| }); err != nil { | ||
| return fmt.Errorf("failed to encode certificate: %w", err) | ||
| } | ||
| for _, c := range resp.CertificateChain { | ||
| if err := pem.Encode(os.Stdout, &pem.Block{ | ||
| Type: "CERTIFICATE", | ||
| Bytes: c.Raw, | ||
| }); err != nil { | ||
| return fmt.Errorf("failed to encode certificate chain: %w", err) | ||
| } | ||
| } | ||
| return nil | ||
| case resp.PublicKey != nil: | ||
| block, err := pemutil.Serialize(resp.PublicKey) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return pem.Encode(os.Stdout, block) | ||
| default: | ||
| return errors.New("failed to create attestation: unsupported response") | ||
| } | ||
| }, | ||
| } | ||
|
|
||
| func init() { | ||
| rootCmd.AddCommand(attestCmd) | ||
| attestCmd.SilenceUsage = true | ||
| } |
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