144 lines
3.7 KiB
Go
144 lines
3.7 KiB
Go
package transit
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import (
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"github.com/hashicorp/vault/helper/certutil"
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"github.com/hashicorp/vault/logical"
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"github.com/hashicorp/vault/logical/framework"
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)
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func (b *backend) pathDatakey() *framework.Path {
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return &framework.Path{
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Pattern: "datakey/" + framework.GenericNameRegex("plaintext") + "/" + framework.GenericNameRegex("name"),
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Fields: map[string]*framework.FieldSchema{
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"name": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "The backend key used for encrypting the data key",
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},
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"plaintext": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `"plaintext" will return the key in both plaintext and
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ciphertext; "wrapped" will return the ciphertext only.`,
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},
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"context": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "Context for key derivation. Required for derived keys.",
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},
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"bits": &framework.FieldSchema{
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Type: framework.TypeInt,
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Description: `Number of bits for the key; currently 128, 256,
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and 512 bits are supported. Defaults to 256.`,
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Default: 256,
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},
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},
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Callbacks: map[logical.Operation]framework.OperationFunc{
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logical.UpdateOperation: b.pathDatakeyWrite,
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},
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HelpSynopsis: pathDatakeyHelpSyn,
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HelpDescription: pathDatakeyHelpDesc,
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}
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}
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func (b *backend) pathDatakeyWrite(
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req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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name := d.Get("name").(string)
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plaintext := d.Get("plaintext").(string)
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plaintextAllowed := false
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switch plaintext {
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case "plaintext":
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plaintextAllowed = true
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case "wrapped":
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default:
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return logical.ErrorResponse("Invalid path, must be 'plaintext' or 'wrapped'"), logical.ErrInvalidRequest
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}
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// Decode the context if any
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contextRaw := d.Get("context").(string)
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var context []byte
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if len(contextRaw) != 0 {
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var err error
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context, err = base64.StdEncoding.DecodeString(contextRaw)
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if err != nil {
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return logical.ErrorResponse("failed to decode context as base64"), logical.ErrInvalidRequest
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}
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}
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// Get the policy
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p, lock, err := b.lm.GetPolicyShared(req.Storage, name)
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if lock != nil {
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defer lock.RUnlock()
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}
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if err != nil {
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return nil, err
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}
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if p == nil {
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return logical.ErrorResponse("policy not found"), logical.ErrInvalidRequest
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}
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newKey := make([]byte, 32)
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bits := d.Get("bits").(int)
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switch bits {
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case 512:
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newKey = make([]byte, 64)
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case 256:
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case 128:
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newKey = make([]byte, 16)
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default:
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return logical.ErrorResponse("invalid bit length"), logical.ErrInvalidRequest
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}
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_, err = rand.Read(newKey)
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if err != nil {
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return nil, err
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}
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ciphertext, err := p.Encrypt(context, base64.StdEncoding.EncodeToString(newKey))
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if err != nil {
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switch err.(type) {
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case certutil.UserError:
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return logical.ErrorResponse(err.Error()), logical.ErrInvalidRequest
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case certutil.InternalError:
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return nil, err
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default:
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return nil, err
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}
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}
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if ciphertext == "" {
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return nil, fmt.Errorf("empty ciphertext returned")
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}
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// Generate the response
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resp := &logical.Response{
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Data: map[string]interface{}{
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"ciphertext": ciphertext,
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},
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}
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if plaintextAllowed {
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resp.Data["plaintext"] = base64.StdEncoding.EncodeToString(newKey)
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}
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return resp, nil
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}
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const pathDatakeyHelpSyn = `Generate a data key`
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const pathDatakeyHelpDesc = `
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This path can be used to generate a data key: a random
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key of a certain length that can be used for encryption
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and decryption, protected by the named backend key. 128, 256,
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or 512 bits can be specified; if not specified, the default
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is 256 bits. Call with the the "wrapped" path to prevent the
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(base64-encoded) plaintext key from being returned along with
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the encrypted key, the "plaintext" path returns both.
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`
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