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wrapping.go
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wrapping.go
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package vault
import (
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/json"
"fmt"
"strings"
"time"
"github.com/SermoDigital/jose/crypto"
"github.com/SermoDigital/jose/jws"
"github.com/SermoDigital/jose/jwt"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/vault/helper/consts"
"github.com/hashicorp/vault/helper/jsonutil"
"github.com/hashicorp/vault/logical"
)
const (
// The location of the key used to generate response-wrapping JWTs
coreWrappingJWTKeyPath = "core/wrapping/jwtkey"
)
func (c *Core) ensureWrappingKey(ctx context.Context) error {
entry, err := c.barrier.Get(ctx, coreWrappingJWTKeyPath)
if err != nil {
return err
}
var keyParams clusterKeyParams
if entry == nil {
key, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
return errwrap.Wrapf("failed to generate wrapping key: {{err}}", err)
}
keyParams.D = key.D
keyParams.X = key.X
keyParams.Y = key.Y
keyParams.Type = corePrivateKeyTypeP521
val, err := jsonutil.EncodeJSON(keyParams)
if err != nil {
return errwrap.Wrapf("failed to encode wrapping key: {{err}}", err)
}
entry = &Entry{
Key: coreWrappingJWTKeyPath,
Value: val,
}
if err = c.barrier.Put(ctx, entry); err != nil {
return errwrap.Wrapf("failed to store wrapping key: {{err}}", err)
}
}
// Redundant if we just created it, but in this case serves as a check anyways
if err = jsonutil.DecodeJSON(entry.Value, &keyParams); err != nil {
return errwrap.Wrapf("failed to decode wrapping key parameters: {{err}}", err)
}
c.wrappingJWTKey = &ecdsa.PrivateKey{
PublicKey: ecdsa.PublicKey{
Curve: elliptic.P521(),
X: keyParams.X,
Y: keyParams.Y,
},
D: keyParams.D,
}
c.logger.Info("loaded wrapping token key")
return nil
}
func (c *Core) wrapInCubbyhole(ctx context.Context, req *logical.Request, resp *logical.Response, auth *logical.Auth) (*logical.Response, error) {
// Before wrapping, obey special rules for listing: if no entries are
// found, 404. This prevents unwrapping only to find empty data.
if req.Operation == logical.ListOperation {
if resp == nil || (len(resp.Data) == 0 && len(resp.Warnings) == 0) {
return nil, logical.ErrUnsupportedPath
}
keysRaw, ok := resp.Data["keys"]
if !ok || keysRaw == nil {
if len(resp.Data) > 0 || len(resp.Warnings) > 0 {
// We could be returning extra metadata on a list, or returning
// warnings with no data, so handle these cases
goto DONELISTHANDLING
}
return nil, logical.ErrUnsupportedPath
}
keys, ok := keysRaw.([]string)
if !ok {
return nil, logical.ErrUnsupportedPath
}
if len(keys) == 0 {
return nil, logical.ErrUnsupportedPath
}
}
DONELISTHANDLING:
var err error
sealWrap := resp.WrapInfo.SealWrap
// If we are wrapping, the first part (performed in this functions) happens
// before auditing so that resp.WrapInfo.Token can contain the HMAC'd
// wrapping token ID in the audit logs, so that it can be determined from
// the audit logs whether the token was ever actually used.
creationTime := time.Now()
te := logical.TokenEntry{
Path: req.Path,
Policies: []string{"response-wrapping"},
CreationTime: creationTime.Unix(),
TTL: resp.WrapInfo.TTL,
NumUses: 1,
ExplicitMaxTTL: resp.WrapInfo.TTL,
}
if err := c.tokenStore.create(ctx, &te); err != nil {
c.logger.Error("failed to create wrapping token", "error", err)
return nil, ErrInternalError
}
resp.WrapInfo.Token = te.ID
resp.WrapInfo.Accessor = te.Accessor
resp.WrapInfo.CreationTime = creationTime
// If this is not a rewrap, store the request path as creation_path
if req.Path != "sys/wrapping/rewrap" {
resp.WrapInfo.CreationPath = req.Path
}
if auth != nil && auth.EntityID != "" {
resp.WrapInfo.WrappedEntityID = auth.EntityID
}
// This will only be non-nil if this response contains a token, so in that
// case put the accessor in the wrap info.
if resp.Auth != nil {
resp.WrapInfo.WrappedAccessor = resp.Auth.Accessor
}
switch resp.WrapInfo.Format {
case "jwt":
// Create the JWT
claims := jws.Claims{}
// Map the JWT ID to the token ID for ease of use
claims.SetJWTID(te.ID)
// Set the issue time to the creation time
claims.SetIssuedAt(creationTime)
// Set the expiration to the TTL
claims.SetExpiration(creationTime.Add(resp.WrapInfo.TTL))
if resp.Auth != nil {
claims.Set("accessor", resp.Auth.Accessor)
}
claims.Set("type", "wrapping")
claims.Set("addr", c.redirectAddr)
jwt := jws.NewJWT(claims, crypto.SigningMethodES512)
serWebToken, err := jwt.Serialize(c.wrappingJWTKey)
if err != nil {
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to serialize JWT", "error", err)
return nil, ErrInternalError
}
resp.WrapInfo.Token = string(serWebToken)
if c.redirectAddr == "" {
resp.AddWarning("No redirect address set in Vault so none could be encoded in the token. You may need to supply Vault's API address when unwrapping the token.")
}
}
cubbyReq := &logical.Request{
Operation: logical.CreateOperation,
Path: "cubbyhole/response",
ClientToken: te.ID,
}
if sealWrap {
cubbyReq.WrapInfo = &logical.RequestWrapInfo{
SealWrap: true,
}
}
// During a rewrap, store the original response, don't wrap it again.
if req.Path == "sys/wrapping/rewrap" {
cubbyReq.Data = map[string]interface{}{
"response": resp.Data["response"],
}
} else {
httpResponse := logical.LogicalResponseToHTTPResponse(resp)
// Add the unique identifier of the original request to the response
httpResponse.RequestID = req.ID
// Because of the way that JSON encodes (likely just in Go) we actually get
// mixed-up values for ints if we simply put this object in the response
// and encode the whole thing; so instead we marshal it first, then store
// the string response. This actually ends up making it easier on the
// client side, too, as it becomes a straight read-string-pass-to-unmarshal
// operation.
marshaledResponse, err := json.Marshal(httpResponse)
if err != nil {
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to marshal wrapped response", "error", err)
return nil, ErrInternalError
}
cubbyReq.Data = map[string]interface{}{
"response": string(marshaledResponse),
}
}
cubbyResp, err := c.router.Route(ctx, cubbyReq)
if err != nil {
// Revoke since it's not yet being tracked for expiration
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to store wrapped response information", "error", err)
return nil, ErrInternalError
}
if cubbyResp != nil && cubbyResp.IsError() {
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to store wrapped response information", "error", cubbyResp.Data["error"])
return cubbyResp, nil
}
// Store info for lookup
cubbyReq.WrapInfo = nil
cubbyReq.Path = "cubbyhole/wrapinfo"
cubbyReq.Data = map[string]interface{}{
"creation_ttl": resp.WrapInfo.TTL,
"creation_time": creationTime,
}
// Store creation_path if not a rewrap
if req.Path != "sys/wrapping/rewrap" {
cubbyReq.Data["creation_path"] = req.Path
} else {
cubbyReq.Data["creation_path"] = resp.WrapInfo.CreationPath
}
cubbyResp, err = c.router.Route(ctx, cubbyReq)
if err != nil {
// Revoke since it's not yet being tracked for expiration
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to store wrapping information", "error", err)
return nil, ErrInternalError
}
if cubbyResp != nil && cubbyResp.IsError() {
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to store wrapping information", "error", cubbyResp.Data["error"])
return cubbyResp, nil
}
wAuth := &logical.Auth{
ClientToken: te.ID,
Policies: []string{"response-wrapping"},
LeaseOptions: logical.LeaseOptions{
TTL: te.TTL,
Renewable: false,
},
}
// Register the wrapped token with the expiration manager
if err := c.expiration.RegisterAuth(te.Path, wAuth); err != nil {
// Revoke since it's not yet being tracked for expiration
c.tokenStore.revokeOrphan(ctx, te.ID)
c.logger.Error("failed to register cubbyhole wrapping token lease", "request_path", req.Path, "error", err)
return nil, ErrInternalError
}
return nil, nil
}
// ValidateWrappingToken checks whether a token is a wrapping token.
func (c *Core) ValidateWrappingToken(req *logical.Request) (bool, error) {
if req == nil {
return false, fmt.Errorf("invalid request")
}
var err error
var token string
var thirdParty bool
if req.Data != nil && req.Data["token"] != nil {
thirdParty = true
if tokenStr, ok := req.Data["token"].(string); !ok {
return false, fmt.Errorf("could not decode token in request body")
} else if tokenStr == "" {
return false, fmt.Errorf("empty token in request body")
} else {
token = tokenStr
}
} else {
token = req.ClientToken
}
// Check for it being a JWT. If it is, and it is valid, we extract the
// internal client token from it and use that during lookup.
if strings.Count(token, ".") == 2 {
wt, err := jws.ParseJWT([]byte(token))
// If there's an error we simply fall back to attempting to use it as a regular token
if err == nil && wt != nil {
validator := &jwt.Validator{}
validator.SetClaim("type", "wrapping")
if err = wt.Validate(&c.wrappingJWTKey.PublicKey, crypto.SigningMethodES512, []*jwt.Validator{validator}...); err != nil {
return false, errwrap.Wrapf("wrapping token signature could not be validated: {{err}}", err)
}
token, _ = wt.Claims().JWTID()
// We override the given request client token so that the rest of
// Vault sees the real value. This also ensures audit logs are
// consistent with the actual token that was issued.
if !thirdParty {
req.ClientToken = token
} else {
req.Data["token"] = token
}
}
}
if token == "" {
return false, fmt.Errorf("token is empty")
}
if c.Sealed() {
return false, consts.ErrSealed
}
c.stateLock.RLock()
defer c.stateLock.RUnlock()
if c.standby {
return false, consts.ErrStandby
}
te, err := c.tokenStore.Lookup(c.activeContext, token)
if err != nil {
return false, err
}
if te == nil {
return false, nil
}
if len(te.Policies) != 1 {
return false, nil
}
if te.Policies[0] != responseWrappingPolicyName && te.Policies[0] != controlGroupPolicyName {
return false, nil
}
return true, nil
}