351 lines
10 KiB
Go
351 lines
10 KiB
Go
package transit
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import (
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"context"
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"crypto/sha256"
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"crypto/sha512"
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"encoding/base64"
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"fmt"
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"hash"
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"github.com/hashicorp/vault/helper/errutil"
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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) pathSign() *framework.Path {
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return &framework.Path{
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Pattern: "sign/" + framework.GenericNameRegex("name") + framework.OptionalParamRegex("urlalgorithm"),
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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 key to use",
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},
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"input": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "The base64-encoded input data",
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},
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"context": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `Base64 encoded context for key derivation. Required if key
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derivation is enabled; currently only available with ed25519 keys.`,
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},
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"hash_algorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Default: "sha2-256",
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Description: `Hash algorithm to use (POST body parameter). Valid values are:
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* sha2-224
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* sha2-256
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* sha2-384
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* sha2-512
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Defaults to "sha2-256". Not valid for all key types,
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including ed25519.`,
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},
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"algorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Default: "sha2-256",
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Description: `Deprecated: use "hash_algorithm" instead.`,
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},
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"urlalgorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `Hash algorithm to use (POST URL parameter)`,
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},
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"key_version": &framework.FieldSchema{
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Type: framework.TypeInt,
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Description: `The version of the key to use for signing.
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Must be 0 (for latest) or a value greater than or equal
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to the min_encryption_version configured on the key.`,
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},
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"prehashed": &framework.FieldSchema{
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Type: framework.TypeBool,
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Description: `Set to 'true' when the input is already hashed. If the key type is 'rsa-2048' or 'rsa-4096', then the algorithm used to hash the input should be indicated by the 'algorithm' parameter.`,
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},
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"signature_algorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `The signature algorithm to use for signing. Currently only applies to RSA key types.
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Options are 'pss' or 'pkcs1v15'. Defaults to 'pss'`,
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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.pathSignWrite,
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},
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HelpSynopsis: pathSignHelpSyn,
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HelpDescription: pathSignHelpDesc,
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}
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}
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func (b *backend) pathVerify() *framework.Path {
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return &framework.Path{
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Pattern: "verify/" + framework.GenericNameRegex("name") + framework.OptionalParamRegex("urlalgorithm"),
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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 key to use",
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},
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"context": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `Base64 encoded context for key derivation. Required if key
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derivation is enabled; currently only available with ed25519 keys.`,
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},
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"signature": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "The signature, including vault header/key version",
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},
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"hmac": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "The HMAC, including vault header/key version",
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},
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"input": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: "The base64-encoded input data to verify",
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},
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"urlalgorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `Hash algorithm to use (POST URL parameter)`,
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},
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"hash_algorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Default: "sha2-256",
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Description: `Hash algorithm to use (POST body parameter). Valid values are:
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* sha2-224
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* sha2-256
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* sha2-384
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* sha2-512
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Defaults to "sha2-256". Not valid for all key types.`,
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},
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"algorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Default: "sha2-256",
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Description: `Deprecated: use "hash_algorithm" instead.`,
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},
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"prehashed": &framework.FieldSchema{
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Type: framework.TypeBool,
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Description: `Set to 'true' when the input is already hashed. If the key type is 'rsa-2048' or 'rsa-4096', then the algorithm used to hash the input should be indicated by the 'algorithm' parameter.`,
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},
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"signature_algorithm": &framework.FieldSchema{
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Type: framework.TypeString,
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Description: `The signature algorithm to use for signature verification. Currently only applies to RSA key types.
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Options are 'pss' or 'pkcs1v15'. Defaults to 'pss'`,
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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.pathVerifyWrite,
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},
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HelpSynopsis: pathVerifyHelpSyn,
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HelpDescription: pathVerifyHelpDesc,
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}
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}
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func (b *backend) pathSignWrite(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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name := d.Get("name").(string)
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ver := d.Get("key_version").(int)
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inputB64 := d.Get("input").(string)
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hashAlgorithm := d.Get("urlalgorithm").(string)
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if hashAlgorithm == "" {
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hashAlgorithm = d.Get("hash_algorithm").(string)
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if hashAlgorithm == "" {
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hashAlgorithm = d.Get("algorithm").(string)
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}
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}
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prehashed := d.Get("prehashed").(bool)
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sigAlgorithm := d.Get("signature_algorithm").(string)
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input, err := base64.StdEncoding.DecodeString(inputB64)
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if err != nil {
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return logical.ErrorResponse(fmt.Sprintf("unable to decode input as base64: %s", err)), logical.ErrInvalidRequest
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}
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// Get the policy
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p, lock, err := b.lm.GetPolicyShared(ctx, 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("encryption key not found"), logical.ErrInvalidRequest
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}
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if !p.Type.SigningSupported() {
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return logical.ErrorResponse(fmt.Sprintf("key type %v does not support signing", p.Type)), logical.ErrInvalidRequest
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}
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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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context, err = base64.StdEncoding.DecodeString(contextRaw)
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if err != nil {
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return logical.ErrorResponse("failed to base64-decode context"), logical.ErrInvalidRequest
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}
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}
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if p.Type.HashSignatureInput() && !prehashed {
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var hf hash.Hash
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switch hashAlgorithm {
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case "sha2-224":
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hf = sha256.New224()
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case "sha2-256":
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hf = sha256.New()
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case "sha2-384":
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hf = sha512.New384()
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case "sha2-512":
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hf = sha512.New()
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default:
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return logical.ErrorResponse(fmt.Sprintf("unsupported hash algorithm %s", hashAlgorithm)), nil
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}
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hf.Write(input)
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input = hf.Sum(nil)
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}
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sig, err := p.Sign(ver, context, input, hashAlgorithm, sigAlgorithm)
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if err != nil {
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return nil, err
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}
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if sig == nil {
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return nil, fmt.Errorf("signature could not be computed")
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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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"signature": sig.Signature,
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},
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}
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if len(sig.PublicKey) > 0 {
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resp.Data["public_key"] = sig.PublicKey
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}
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return resp, nil
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}
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func (b *backend) pathVerifyWrite(ctx context.Context, req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
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sig := d.Get("signature").(string)
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hmac := d.Get("hmac").(string)
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switch {
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case sig != "" && hmac != "":
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return logical.ErrorResponse("provide one of 'signature' or 'hmac'"), logical.ErrInvalidRequest
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case sig == "" && hmac == "":
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return logical.ErrorResponse("neither a 'signature' nor an 'hmac' were given to verify"), logical.ErrInvalidRequest
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case hmac != "":
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return b.pathHMACVerify(ctx, req, d, hmac)
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}
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name := d.Get("name").(string)
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inputB64 := d.Get("input").(string)
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hashAlgorithm := d.Get("urlalgorithm").(string)
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if hashAlgorithm == "" {
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hashAlgorithm = d.Get("hash_algorithm").(string)
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if hashAlgorithm == "" {
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hashAlgorithm = d.Get("algorithm").(string)
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}
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}
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prehashed := d.Get("prehashed").(bool)
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sigAlgorithm := d.Get("signature_algorithm").(string)
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input, err := base64.StdEncoding.DecodeString(inputB64)
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if err != nil {
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return logical.ErrorResponse(fmt.Sprintf("unable to decode input as base64: %s", err)), logical.ErrInvalidRequest
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}
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// Get the policy
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p, lock, err := b.lm.GetPolicyShared(ctx, 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("encryption key not found"), logical.ErrInvalidRequest
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}
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if !p.Type.SigningSupported() {
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return logical.ErrorResponse(fmt.Sprintf("key type %v does not support verification", p.Type)), logical.ErrInvalidRequest
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}
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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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context, err = base64.StdEncoding.DecodeString(contextRaw)
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if err != nil {
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return logical.ErrorResponse("failed to base64-decode context"), logical.ErrInvalidRequest
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}
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}
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if p.Type.HashSignatureInput() && !prehashed {
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var hf hash.Hash
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switch hashAlgorithm {
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case "sha2-224":
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hf = sha256.New224()
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case "sha2-256":
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hf = sha256.New()
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case "sha2-384":
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hf = sha512.New384()
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case "sha2-512":
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hf = sha512.New()
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default:
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return logical.ErrorResponse(fmt.Sprintf("unsupported hash algorithm %s", hashAlgorithm)), nil
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}
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hf.Write(input)
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input = hf.Sum(nil)
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}
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valid, err := p.VerifySignature(context, input, sig, hashAlgorithm, sigAlgorithm)
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if err != nil {
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switch err.(type) {
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case errutil.UserError:
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return logical.ErrorResponse(err.Error()), logical.ErrInvalidRequest
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case errutil.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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// Generate the response
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resp := &logical.Response{
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Data: map[string]interface{}{
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"valid": valid,
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},
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}
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return resp, nil
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}
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const pathSignHelpSyn = `Generate a signature for input data using the named key`
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const pathSignHelpDesc = `
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Generates a signature of the input data using the named key and the given hash algorithm.
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`
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const pathVerifyHelpSyn = `Verify a signature or HMAC for input data created using the named key`
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const pathVerifyHelpDesc = `
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Verifies a signature or HMAC of the input data using the named key and the given hash algorithm.
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`
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