audit: log invalid wrapping token request/response

helper/consts/error.go

@@ -13,4 +13,7 @@ var (
 
 	// Used when .. is used in a path
 	ErrPathContainsParentReferences = errors.New("path cannot contain parent references")
+
+	// ErrInvalidToken
+	ErrInvalidWrappingToken = errors.New("wrapping token is not valid or does not exist")
 )

http/handler.go

@@ -284,25 +284,6 @@ func WrapForwardedForHandler(h http.Handler, authorizedAddrs []*sockaddr.SockAdd
 	})
 }
 
-// A lookup on a token that is about to expire returns nil, which means by the
-// time we can validate a wrapping token lookup will return nil since it will
-// be revoked after the call. So we have to do the validation here.
-func wrappingVerificationFunc(ctx context.Context, core *vault.Core, req *logical.Request) error {
-	if req == nil {
-		return fmt.Errorf("invalid request")
-	}
-
-	valid, err := core.ValidateWrappingToken(ctx, req)
-	if err != nil {
-		return errwrap.Wrapf("error validating wrapping token: {{err}}", err)
-	}
-	if !valid {
-		return fmt.Errorf("wrapping token is not valid or does not exist")
-	}
-
-	return nil
-}
-
 // stripPrefix is a helper to strip a prefix from the path. It will
 // return false from the second return value if it the prefix doesn't exist.
 func stripPrefix(prefix, path string) (string, bool) {

http/logical.go

@@ -12,7 +12,7 @@ import (
 	"time"
 
 	"github.com/hashicorp/errwrap"
-	uuid "github.com/hashicorp/go-uuid"
+	"github.com/hashicorp/go-uuid"
 	"github.com/hashicorp/vault/helper/namespace"
 	"github.com/hashicorp/vault/logical"
 	"github.com/hashicorp/vault/vault"
@@ -187,14 +187,11 @@ func handleLogicalInternal(core *vault.Core, injectDataIntoTopLevel bool) http.H
 			switch req.Path {
 			case "sys/wrapping/lookup", "sys/wrapping/rewrap", "sys/wrapping/unwrap":
 				r = r.WithContext(newCtx)
-				if err := wrappingVerificationFunc(r.Context(), core, req); err != nil {
-					if errwrap.Contains(err, logical.ErrPermissionDenied.Error()) {
-						respondError(w, http.StatusForbidden, err)
-					} else {
-						respondError(w, http.StatusBadRequest, err)
-					}
-					return
-				}
+				// We perform validation but don't check the error here yet so
+				// that the request/response can be logged once we're in the
+				// logical layer. This is more for logical.Request modification
+				// depending on how the wrapping token was provided.
+				_, _ = core.ValidateWrappingToken(r.Context(), req, true)
 
 			// The -self paths have no meaning outside of the token NS, so
 			// requests for these paths always go to the token NS

vault/request_handling.go

@@ -584,6 +584,32 @@ func (c *Core) handleRequest(ctx context.Context, req *logical.Request) (retResp
 		return nil, nil, ctErr
 	}
 
+	// If this is a wrapping request, check for token validity before routing
+	switch req.Path {
+	case "sys/wrapping/rewrap", "sys/wrapping/unwrap":
+		valid, err := c.ValidateWrappingToken(ctx, req, false)
+		// Perform audit logging before returning if there's an issue with checking
+		// the wrapping token
+		if err != nil || !valid {
+			logInput := &audit.LogInput{
+				Auth:               auth,
+				Request:            req,
+				OuterErr:           ctErr,
+				NonHMACReqDataKeys: nonHMACReqDataKeys,
+			}
+			if err := c.auditBroker.LogRequest(ctx, logInput, c.auditedHeaders); err != nil {
+				c.logger.Error("failed to audit request", "path", req.Path, "error", err)
+			}
+		}
+
+		if err != nil {
+			return nil, nil, errwrap.Wrapf("error validating wrapping token: {{err}}", err)
+		}
+		if !valid {
+			return logical.ErrorResponse(consts.ErrInvalidWrappingToken.Error()), nil, logical.ErrInvalidRequest
+		}
+	}
+
 	// We run this logic first because we want to decrement the use count even
 	// in the case of an error (assuming we can successfully look up; if we
 	// need to forward, we exit before now)
@@ -901,6 +927,15 @@ func (c *Core) handleRequest(ctx context.Context, req *logical.Request) (retResp
 func (c *Core) handleLoginRequest(ctx context.Context, req *logical.Request) (retResp *logical.Response, retAuth *logical.Auth, retErr error) {
 	defer metrics.MeasureSince([]string{"core", "handle_login_request"}, time.Now())
 
+	var nonHMACReqDataKeys []string
+	entry := c.router.MatchingMountEntry(ctx, req.Path)
+	if entry != nil {
+		// Get and set ignored HMAC'd value.
+		if rawVals, ok := entry.synthesizedConfigCache.Load("audit_non_hmac_request_keys"); ok {
+			nonHMACReqDataKeys = rawVals.([]string)
+		}
+	}
+
 	req.Unauthenticated = true
 
 	var auth *logical.Auth
@@ -922,15 +957,6 @@ func (c *Core) handleLoginRequest(ctx context.Context, req *logical.Request) (re
 			errType = logical.ErrInvalidRequest
 		}
 
-		var nonHMACReqDataKeys []string
-		entry := c.router.MatchingMountEntry(ctx, req.Path)
-		if entry != nil {
-			// Get and set ignored HMAC'd value.
-			if rawVals, ok := entry.synthesizedConfigCache.Load("audit_non_hmac_request_keys"); ok {
-				nonHMACReqDataKeys = rawVals.([]string)
-			}
-		}
-
 		logInput := &audit.LogInput{
 			Auth:               auth,
 			Request:            req,
@@ -951,6 +977,31 @@ func (c *Core) handleLoginRequest(ctx context.Context, req *logical.Request) (re
 		return logical.ErrorResponse(ctErr.Error()), auth, retErr
 	}
 
+	// If this is a wrapping token lookup, validate the token and produce an audit log
+	switch req.Path {
+	case "sys/wrapping/lookup":
+		valid, err := c.ValidateWrappingToken(ctx, req, false)
+		// Perform audit logging before returning if there's an issue with checking
+		// the wrapping token
+		if err != nil || !valid {
+			logInput := &audit.LogInput{
+				Auth:               auth,
+				Request:            req,
+				OuterErr:           ctErr,
+				NonHMACReqDataKeys: nonHMACReqDataKeys,
+			}
+			if err := c.auditBroker.LogRequest(ctx, logInput, c.auditedHeaders); err != nil {
+				c.logger.Error("failed to audit request", "path", req.Path, "error", err)
+			}
+		}
+		if err != nil {
+			return nil, nil, errwrap.Wrapf("error validating wrapping token: {{err}}", err)
+		}
+		if !valid {
+			return logical.ErrorResponse(consts.ErrInvalidWrappingToken.Error()), nil, logical.ErrInvalidRequest
+		}
+	}
+
 	// Create an audit trail of the request. Attach auth if it was returned,
 	// e.g. if a token was provided.
 	logInput := &audit.LogInput{

vault/wrapping.go

@@ -309,16 +309,20 @@ DONELISTHANDLING:
 	return nil, nil
 }
 
-// ValidateWrappingToken checks whether a token is a wrapping token.
-func (c *Core) ValidateWrappingToken(ctx context.Context, req *logical.Request) (bool, error) {
+// ValidateWrappingToken checks whether a token is a wrapping token. The passed
+// in logical request can be optionally updated if the wrapping token was
+// provided within a JWT token.
+func (c *Core) ValidateWrappingToken(ctx context.Context, req *logical.Request, updateRequest bool) (bool, error) {
 	if req == nil {
 		return false, fmt.Errorf("invalid request")
 	}
 
 	var err error
-
 	var token string
 	var thirdParty bool
+
+	// Check if the wrapping token is coming from the request body, and it not
+	// assume that req.ClientToken is the wrapping token
 	if req.Data != nil && req.Data["token"] != nil {
 		thirdParty = true
 		if tokenStr, ok := req.Data["token"].(string); !ok {
@@ -360,10 +364,12 @@ func (c *Core) ValidateWrappingToken(ctx context.Context, req *logical.Request)
 		if typeClaim != "wrapping" {
 			return false, errors.New("unexpected type claim")
 		}
-		if !thirdParty {
-			req.ClientToken = claims.ID
-		} else {
-			req.Data["token"] = claims.ID
+		if updateRequest {
+			if !thirdParty {
+				req.ClientToken = claims.ID
+			} else {
+				req.Data["token"] = claims.ID
+			}
 		}
 		token = claims.ID
 	}
@@ -398,7 +404,7 @@ func (c *Core) ValidateWrappingToken(ctx context.Context, req *logical.Request)
 		return false, nil
 	}
 
-	if !thirdParty {
+	if !thirdParty && updateRequest {
 		req.ClientTokenAccessor = te.Accessor
 		req.ClientTokenRemainingUses = te.NumUses
 		req.SetTokenEntry(te)