Audit: Add token's use count to audit response

audit/format.go

@@ -102,9 +102,10 @@ func (f *AuditFormatter) FormatRequest(
 		Error: errString,
 
 		Auth: AuditAuth{
-			DisplayName: auth.DisplayName,
-			Policies:    auth.Policies,
-			Metadata:    auth.Metadata,
+			DisplayName:   auth.DisplayName,
+			Policies:      auth.Policies,
+			Metadata:      auth.Metadata,
+			RemainingUses: req.ClientTokenRemainingUses,
 		},
 
 		Request: AuditRequest{
@@ -255,6 +256,7 @@ func (f *AuditFormatter) FormatResponse(
 			DisplayName: resp.Auth.DisplayName,
 			Policies:    resp.Auth.Policies,
 			Metadata:    resp.Auth.Metadata,
+			NumUses:     resp.Auth.NumUses,
 		}
 	}
 
@@ -362,11 +364,13 @@ type AuditResponse struct {
 }
 
 type AuditAuth struct {
-	ClientToken string            `json:"client_token"`
-	Accessor    string            `json:"accessor"`
-	DisplayName string            `json:"display_name"`
-	Policies    []string          `json:"policies"`
-	Metadata    map[string]string `json:"metadata"`
+	ClientToken   string            `json:"client_token"`
+	Accessor      string            `json:"accessor"`
+	DisplayName   string            `json:"display_name"`
+	Policies      []string          `json:"policies"`
+	Metadata      map[string]string `json:"metadata"`
+	NumUses       int               `json:"num_uses,omitempty"`
+	RemainingUses int               `json:"remaining_uses,omitempty"`
 }
 
 type AuditSecret struct {

http/handler.go

@@ -274,6 +274,7 @@ func requestAuth(core *vault.Core, r *http.Request, req *logical.Request) *logic
 		te, err := core.LookupToken(v)
 		if err == nil && te != nil {
 			req.ClientTokenAccessor = te.Accessor
+			req.ClientTokenRemainingUses = te.NumUses
 		}
 	}
 

logical/request.go

@@ -85,6 +85,10 @@ type Request struct {
 	// WrapInfo contains requested response wrapping parameters
 	WrapInfo *RequestWrapInfo `json:"wrap_info" structs:"wrap_info" mapstructure:"wrap_info"`
 
+	// ClientTokenNumUses represents the allowed number of uses left on the
+	// token supplied
+	ClientTokenRemainingUses int `json:"client_token_remaining_uses" structs:"client_token_remaining_uses" mapstructure:"client_token_remaining_uses"`
+
 	// For replication, contains the last WAL on the remote side after handling
 	// the request, used for best-effort avoidance of stale read-after-write
 	lastRemoteWAL uint64

vault/audit_test.go

@@ -444,6 +444,7 @@ func TestAuditBroker_LogResponse(t *testing.T) {
 	b.Register("bar", a2, nil)
 
 	auth := &logical.Auth{
+		NumUses:     10,
 		ClientToken: "foo",
 		Policies:    []string{"dev", "ops"},
 		Metadata: map[string]string{

vault/router.go

@@ -283,6 +283,10 @@ func (r *Router) routeCommon(req *logical.Request, existenceCheck bool) (*logica
 	// Cache the identifier of the request
 	originalReqID := req.ID
 
+	// Cache the client token's number of uses in the request
+	originalClientTokenRemainingUses := req.ClientTokenRemainingUses
+	req.ClientTokenRemainingUses = 0
+
 	// Cache the headers and hide them from backends
 	headers := req.Headers
 	req.Headers = nil
@@ -304,6 +308,7 @@ func (r *Router) routeCommon(req *logical.Request, existenceCheck bool) (*logica
 		req.ID = originalReqID
 		req.Storage = nil
 		req.ClientToken = clientToken
+		req.ClientTokenRemainingUses = originalClientTokenRemainingUses
 		req.WrapInfo = wrapInfo
 		req.Headers = headers
 		// This is only set in one place, after routing, so should never be set

vault/token_store.go

@@ -1713,6 +1713,7 @@ func (ts *TokenStore) handleCreateCommon(
 
 	// Generate the response
 	resp.Auth = &logical.Auth{
+		NumUses:     te.NumUses,
 		DisplayName: te.DisplayName,
 		Policies:    te.Policies,
 		Metadata:    te.Meta,