259 lines
6.4 KiB
Go
259 lines
6.4 KiB
Go
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package transit
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import (
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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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"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".`,
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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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},
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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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"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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"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".`,
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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(
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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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inputB64 := d.Get("input").(string)
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algorithm := d.Get("urlalgorithm").(string)
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if algorithm == "" {
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algorithm = d.Get("algorithm").(string)
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}
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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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var hf hash.Hash
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switch algorithm {
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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 algorithm %s", algorithm)), nil
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}
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hf.Write(input)
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hashedInput := hf.Sum(nil)
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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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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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sig, err := p.Sign(hashedInput)
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if err != nil {
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return nil, err
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}
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if sig == "" {
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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,
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},
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}
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return resp, nil
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}
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func (b *backend) pathVerifyWrite(
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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(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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algorithm := d.Get("urlalgorithm").(string)
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if algorithm == "" {
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algorithm = d.Get("algorithm").(string)
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}
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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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var hf hash.Hash
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switch algorithm {
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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 algorithm %s", algorithm)), nil
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}
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hf.Write(input)
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hashedInput := hf.Sum(nil)
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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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valid, err := p.VerifySignature(hashedInput, sig)
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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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