First implementation of policies

gql.go

@@ -708,6 +708,8 @@ func LoadGQLThread(ctx *Context, id NodeID, data []byte, nodes NodeMap) (Node, e
   }
 
   thread := NewGQLThread(id, j.Name, j.StateName, j.Listen, ecdh_curve, key, j.TLSCert, j.TLSKey)
+  nodes[id] = &thread
+
   thread.Users = map[NodeID]*User{}
   for _, id_str := range(j.Users) {
     id, err := ParseID(id_str)
@@ -720,7 +722,6 @@ func LoadGQLThread(ctx *Context, id NodeID, data []byte, nodes NodeMap) (Node, e
     }
     thread.Users[id] = user.(*User)
   }
-  nodes[id] = &thread
 
   err = RestoreSimpleThread(ctx, &thread, j.SimpleThreadJSON, nodes)
   if err != nil {

gql_graph.go

@@ -894,14 +894,14 @@ func GQLMutationSendUpdate() *graphql.Field {
         },
       },
       Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-        server, ok := p.Context.Value("gql_server").(*GQLThread)
-        if ok == false {
-          return nil, fmt.Errorf("Failed to cast context gql_server to GQLServer: %+v", p.Context.Value("gql_server"))
+        ctx, server, user, err := GQLPrepResolve(p)
+        if err != nil {
+          return nil, err
         }
 
-        ctx, ok := p.Context.Value("graph_context").(*Context)
-        if ok == false {
-          return nil, fmt.Errorf("Failed to cast context graph_context to Context: %+v", p.Context.Value("graph_context"))
+        err = server.Allowed("signal", "self", user.ID())
+        if err != nil {
+          return nil, err
         }
 
         signal_map, ok := p.Args["signal"].(map[string]interface{})
@@ -950,15 +950,40 @@ func GQLMutationSendUpdate() *graphql.Field {
   return gql_mutation_send_update
 }
 
+func GQLPrepResolve(p graphql.ResolveParams) (*Context, *GQLThread, *User, error) {
+  context, ok := p.Context.Value("graph_context").(*Context)
+  if ok == false {
+    return nil, nil, nil, fmt.Errorf("failed to cast graph_context to *Context")
+  }
+
+  server, ok := p.Context.Value("gql_server").(*GQLThread)
+  if ok == false {
+    return nil, nil, nil, fmt.Errorf("failed to cast gql_server to *GQLThread")
+  }
+
+  user, ok := p.Context.Value("user").(*User)
+  if ok == false {
+    return nil, nil, nil, fmt.Errorf("failed to cast user to *User")
+  }
+
+  return context, server, user, nil
+}
+
 var gql_query_self *graphql.Field = nil
 func GQLQuerySelf() *graphql.Field {
   if gql_query_self == nil {
     gql_query_self = &graphql.Field{
       Type: GQLTypeGQLThread(),
       Resolve: func(p graphql.ResolveParams) (interface{}, error) {
-        server, ok := p.Context.Value("gql_server").(*GQLThread)
-        if ok == false {
-          return nil, fmt.Errorf("failed to cast gql_server to GQLThread")
+        _, server, user, err := GQLPrepResolve(p)
+
+        if err != nil {
+          return nil, err
+        }
+
+        err = server.Allowed("enumerate", "self", user.ID())
+        if err != nil {
+          return nil, fmt.Errorf("User %s is not allowed to perform self.enumerate on %s", user.ID(), server.ID())
         }
 
         return server, nil

gql_test.go

@@ -22,6 +22,10 @@ func TestGQLThread(t * testing.T) {
   ctx := logTestContext(t, []string{})
   key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
   fatalErr(t, err)
+
+  p1_r := NewPerNodePolicy(RandID(), nil, NewNodeActions(nil, []string{"enumerate"}))
+  p1 := &p1_r
+
   gql_t_r := NewGQLThread(RandID(), "GQL Thread", "init", ":0", ecdh.P256(), key, nil, nil)
   gql_t := &gql_t_r
 
@@ -30,9 +34,13 @@ func TestGQLThread(t * testing.T) {
   t2_r := NewSimpleThread(RandID(), "Test thread 2", "init", nil, BaseThreadActions, BaseThreadHandlers)
   t2 := &t2_r
 
-  err = UpdateStates(ctx, []Node{gql_t, t1, t2}, func(nodes NodeMap) error {
+  err = UpdateStates(ctx, []Node{gql_t, t1, t2, p1}, func(nodes NodeMap) error {
+    err := gql_t.AddPolicy(p1)
+    if err != nil {
+      return err
+    }
     i1 := NewParentThreadInfo(true, "start", "restore")
-    err := LinkThreads(ctx, gql_t, t1, &i1, nodes)
+    err = LinkThreads(ctx, gql_t, t1, &i1, nodes)
     if err != nil {
       return err
     }
@@ -71,7 +79,7 @@ func TestGQLDBLoad(t * testing.T) {
   u1_r := NewUser("Test User", time.Now(), &u1_key.PublicKey, u1_shared)
   u1 := &u1_r
 
-  p1_r := NewPerNodePolicy(RandID(), nil, NewNodeActions([]string{"*"}))
+  p1_r := NewPerNodePolicy(RandID(), nil, NewNodeActions(nil, []string{"enumerate"}))
   p1 := &p1_r
 
   key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
@@ -81,7 +89,7 @@ func TestGQLDBLoad(t * testing.T) {
 
   info := NewParentThreadInfo(true, "start", "restore")
   err = UpdateStates(ctx, []Node{gql, t1, l1, u1, p1}, func(nodes NodeMap) error {
-    err := u1.AddPolicy(p1)
+    err := gql.AddPolicy(p1)
     if err != nil {
       return err
     }
@@ -152,13 +160,20 @@ func TestGQLDBLoad(t * testing.T) {
 }
 
 func TestGQLAuth(t * testing.T) {
-  ctx := logTestContext(t, []string{"test", "gql"})
+  ctx := logTestContext(t, []string{"test", "gql", "db"})
   key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
   fatalErr(t, err)
 
+  p1_r := NewPerNodePolicy(RandID(), nil, NewNodeActions(nil, []string{"*"}))
+  p1 := &p1_r
+
   gql_t_r := NewGQLThread(RandID(), "GQL Thread", "init", ":0", ecdh.P256(), key, nil, nil)
   gql_t := &gql_t_r
 
+  err = UpdateStates(ctx, []Node{gql_t, p1}, func(nodes NodeMap) error {
+    return gql_t.AddPolicy(p1)
+  })
+
   done := make(chan error, 1)
 
   var update_channel chan GraphSignal

node.go

@@ -69,7 +69,7 @@ type Node interface {
   ID() NodeID
   Type() NodeType
 
-  Allowed(action string, resource string, principal NodeID) bool
+  Allowed(action string, resource string, principal NodeID) error
   AddPolicy(Policy) error
   RemovePolicy(Policy) error
 
@@ -100,13 +100,13 @@ func (node * GraphNode) Serialize() ([]byte, error) {
   return json.MarshalIndent(&node_json, "", "  ")
 }
 
-func (node *GraphNode) Allowed(action string, resource string, principal NodeID) bool {
+func (node *GraphNode) Allowed(action string, resource string, principal NodeID) error {
   for _, policy := range(node.policies) {
     if policy.Allows(action, resource, principal) == true {
-      return true
+      return nil
     }
   }
-  return false
+  return fmt.Errorf("%s is not allowed to perform %s.%s on %s", principal.String(), resource, action, node.ID().String())
 }
 
 func (node *GraphNode) AddPolicy(policy Policy) error {

policy.go

@@ -4,17 +4,17 @@ import (
   "encoding/json"
 )
 
-// A policy represents a set of rules attached to a Node that allow it to preform actions
+// A policy represents a set of rules attached to a Node that allow principals to perform actions on it
 type Policy interface {
   Node
-  // Returns true if the policy allows the action on the given principal
+  // Returns true if the principal is allowed to perform the action on the resource
   Allows(action string, resource string, principal NodeID) bool
 }
 
 type NodeActions map[string][]string
 func (actions NodeActions) Allows(action string, resource string) bool {
   for _, a := range(actions[""]) {
-    if a == action {
+    if a == action || a == "*" {
       return true
     }
   }
@@ -22,7 +22,7 @@ func (actions NodeActions) Allows(action string, resource string) bool {
   resource_actions, exists := actions[resource]
   if exists == true {
     for _, a := range(resource_actions) {
-      if a == action {
+      if a == action || a == "*" {
         return true
       }
     }
@@ -31,14 +31,16 @@ func (actions NodeActions) Allows(action string, resource string) bool {
   return false
 }
 
-func NewNodeActions(wildcard_actions []string) NodeActions {
-  actions := NodeActions{}
+func NewNodeActions(resource_actions NodeActions, wildcard_actions []string) NodeActions {
+  if resource_actions == nil {
+    resource_actions = NodeActions{}
+  }
   // Wildcard actions, all actions in "" will be allowed on all resources
   if wildcard_actions == nil {
     wildcard_actions = []string{}
   }
-  actions[""] = wildcard_actions
-  return actions
+  resource_actions[""] = wildcard_actions
+  return resource_actions
 }
 
 type PerNodePolicy struct {
@@ -76,7 +78,7 @@ func NewPerNodePolicy(id NodeID, node_actions map[NodeID]NodeActions, wildcard_a
   }
 
   if wildcard_actions == nil {
-    wildcard_actions = NewNodeActions(nil)
+    wildcard_actions = NewNodeActions(nil, nil)
   }
 
   return PerNodePolicy{
@@ -115,7 +117,6 @@ func LoadPerNodePolicy(ctx *Context, id NodeID, data []byte, nodes NodeMap) (Nod
 }
 
 func (policy *PerNodePolicy) Allows(action string, resource string, principal NodeID) bool {
-  // Check wildcard actions
   if policy.WildcardActions.Allows(action, resource) == true {
     return true
   }