Fix nil pointer dereference in auth config

builtin/docker/platform.go

@@ -722,7 +722,7 @@ func (p *Platform) pullImage(cli *client.Client, log hclog.Logger, ui terminal.U
 
 	var authBase64 = ""
 	//Check if auth configuration is not null
-	if (*p.config.Auth != Auth{}) {
+	if p.config.Auth != nil && *p.config.Auth != (Auth{}) {
 		auth := types.AuthConfig{
 			Username:      authConfig.Username,
 			Password:      authConfig.Password,

builtin/docker/pull/builder.go

@@ -329,7 +329,7 @@ func (b *Builder) buildWithDocker(
 			return status.Errorf(codes.Internal, "unable to generate authentication info for registry: %s", err)
 		}
 		encodedAuth = base64.URLEncoding.EncodeToString(buf)
-	} else if *b.config.Auth != (docker.Auth{}) {
+	} else if b.config.Auth != nil && *b.config.Auth != (docker.Auth{}) {
 		//If EncodedAuth is not set, and Auth is, use Auth
 		authBytes, err := json.Marshal(types.AuthConfig{
 			Username:      authConfig.Username,
@@ -394,7 +394,7 @@ func (b *Builder) buildWithImg(
 	env := os.Environ()
 
 	//Check if auth configuration is not null
-	if (*b.config.Auth != docker.Auth{}) {
+	if b.config.Auth != nil && *b.config.Auth != (docker.Auth{}) {
 		auth, err := json.Marshal(types.AuthConfig{
 			Username:      authConfig.Username,
 			Password:      authConfig.Password,

builtin/docker/registry_docker.go

@@ -115,7 +115,7 @@ func (r *Registry) pushWithDocker(
 			return status.Errorf(codes.Internal, "unable to generate authentication info for registry: %s", err)
 		}
 		encodedAuth = base64.URLEncoding.EncodeToString(buf)
-	} else if (*r.config.Auth != Auth{}) {
+	} else if r.config.Auth != nil && *r.config.Auth != (Auth{}) {
 		if authConfig.Hostname != "" {
 			return status.Errorf(codes.InvalidArgument, "hostname not supported for registry")
 		}