/
roottoken.go
163 lines (136 loc) · 4.62 KB
/
roottoken.go
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//
// Copyright (c) 2021 Intel Corporation
//
// 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 vault
import (
"encoding/base64"
"errors"
"fmt"
"net/http"
)
func (c *Client) RegenRootToken(keys []string) (string, error) {
// cancel any previous generation attempt
// start root token generation --> nonce, otp
// provide keys, nonce --> encoded token
// encoded token + otp --> root token
// caller should revoke root token when done with it
if err := c.rootTokenCancelPrevious(); err != nil {
c.lc.Warn(fmt.Sprintf("failed to cancel previous root token generation: %s", err.Error()))
// Not fatal, continue
}
nonce, otp, err := c.rootTokenStartGeneration()
if err != nil {
c.lc.Error(fmt.Sprintf("failed to start root token generation: %s", err.Error()))
return "", err
}
encodedToken, err := c.rootTokenSubmitKeys(keys, nonce)
if err != nil {
c.lc.Error(fmt.Sprintf("failed to generate new root token: %s", err.Error()))
return "", err
} else if encodedToken == "" {
err := errors.New("insufficient key shares to regenerate root token")
c.lc.Error(err.Error())
return "", err
}
newRootToken, err := c.rootTokenDecodeToken(encodedToken, otp)
if err != nil {
c.lc.Error(fmt.Sprintf("failed to decode root token: %s", err.Error()))
return "", err
}
return newRootToken, nil
}
func (c *Client) rootTokenCancelPrevious() error {
_, err := c.doRequest(RequestArgs{
AuthToken: "",
Method: http.MethodDelete,
Path: RootTokenControlAPI,
JSONObject: nil,
BodyReader: nil,
OperationDescription: "cancel previous root token generation",
ExpectedStatusCode: http.StatusNoContent,
ResponseObject: nil,
})
return err
}
func (c *Client) rootTokenStartGeneration() (string, string, error) {
response := &RootTokenControlResponse{}
_, err := c.doRequest(RequestArgs{
AuthToken: "",
Method: http.MethodPut,
Path: RootTokenControlAPI,
JSONObject: struct{}{},
BodyReader: nil,
OperationDescription: "start root token generation",
ExpectedStatusCode: http.StatusOK,
ResponseObject: response,
})
return response.Nonce, response.Otp, err
}
func (c *Client) rootTokenSubmitKeys(keys []string, nonce string) (string, error) {
var encodedToken string
for _, key := range keys {
complete, token, err := c.rootTokenSubmitKey(key, nonce)
if err != nil {
c.lc.Error(fmt.Sprintf("root token retrieval aborted due to error: %s", err.Error()))
return "", err
} else if complete {
encodedToken = token
break
}
}
return encodedToken, nil
}
func (c *Client) rootTokenSubmitKey(key string, nonce string) (bool, string, error) {
params := RootTokenRetrievalRequest{
Key: key,
Nonce: nonce,
}
response := &RootTokenRetrievalResponse{}
_, err := c.doRequest(RequestArgs{
AuthToken: "",
Method: http.MethodPut,
Path: RootTokenRetrievalAPI,
JSONObject: params,
BodyReader: nil,
OperationDescription: "submit root token key share",
ExpectedStatusCode: http.StatusOK,
ResponseObject: response,
})
if err != nil {
return false, "", err
}
var encodedToken string
if response.Complete {
encodedToken = response.EncodedToken
}
return response.Complete, encodedToken, nil
}
func (c *Client) rootTokenDecodeToken(encodedToken string, otp string) (string, error) {
// otp is base62 ascii pad cast to raw bytes
// encodedToken is un-padded (raw) base64
// XOR the otp bytes with the encoded token bytes to recover the root token
encodedBytes, err := base64.RawStdEncoding.DecodeString(encodedToken)
if err != nil {
c.lc.Error(fmt.Sprintf("failed to base64 decode the encoded token: %s", err.Error()))
return "", err
}
otpBytes := []byte(otp)
if len(encodedBytes) != len(otpBytes) {
return "", fmt.Errorf("Invalid input to rootTokenDecodeToken - array length mismatch: %d != %d", len(encodedBytes), len(otpBytes))
}
decodedBytes := make([]byte, len(encodedBytes))
for i := range decodedBytes {
decodedBytes[i] = encodedBytes[i] ^ otpBytes[i]
}
return string(decodedBytes), nil
}