diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b9fc85..533883e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -58,6 +58,11 @@ install(FILES include/wsfs/status.h DESTINATION include/wsfs)
 set(WSFS_ADAPTER_SOURCES
 	lib/wsfs/adapter/filesystem.c
 	lib/wsfs/adapter/server.c
+	lib/wsfs/adapter/server_config.c
+	lib/wsfs/adapter/server_protocol.c
+	lib/wsfs/adapter/authenticator.c
+	lib/wsfs/adapter/authenticators.c
+	lib/wsfs/adapter/credentials.c
 	lib/wsfs/adapter/time/timepoint.c
 	lib/wsfs/adapter/time/timer.c
 	lib/wsfs/adapter/time/timeout_manager.c
@@ -67,8 +72,6 @@ set(WSFS_ADAPTER_SOURCES
 	lib/wsfs/adapter/operation/open.c
 	lib/wsfs/adapter/operation/close.c
 	lib/wsfs/adapter/operation/read.c
-	lib/wsfs/adapter/server_config.c
-	lib/wsfs/adapter/server_protocol.c
 	lib/wsfs/adapter/jsonrpc/server.c
 	lib/wsfs/adapter/jsonrpc/method.c
 	lib/wsfs/adapter/jsonrpc/request.c
diff --git a/include/wsfs/adapter/authenticate.h b/include/wsfs/adapter/authenticate.h
new file mode 100644
index 0000000..9e630ee
--- /dev/null
+++ b/include/wsfs/adapter/authenticate.h
@@ -0,0 +1,15 @@
+#ifndef WSFS_ADAPTER_AUTHENTICATE_H
+#define WSFS_ADAPTER_AUTHENTICATE_H
+
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+struct wsfs_credentials;
+
+typedef bool wsfs_authenticate_fn(
+    struct wsfs_credentials * credentials,
+    void * user_data);
+
+
+#endif
diff --git a/include/wsfs/adapter/credentials.h b/include/wsfs/adapter/credentials.h
new file mode 100644
index 0000000..747b107
--- /dev/null
+++ b/include/wsfs/adapter/credentials.h
@@ -0,0 +1,25 @@
+#ifndef WSFS_ADAPTER_CREDENTIALS_H
+#define WSFS_ADAPTER_CREDENTIALS_H
+
+#include "wsfs/adapter/api.h"
+
+struct wsfs_credentials;
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+extern WSFSA_API char const * wsfs_credentials_type(
+    struct wsfs_credentials const * credentials);
+
+extern WSFSA_API char const * wsfs_credentials_get(
+    struct wsfs_credentials const * credentials,
+    char const * key);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif
diff --git a/include/wsfs/adapter/server_config.h b/include/wsfs/adapter/server_config.h
index b6d9b7e..df4966e 100644
--- a/include/wsfs/adapter/server_config.h
+++ b/include/wsfs/adapter/server_config.h
@@ -2,6 +2,7 @@
 #define WSFS_ADAPTER_SERVER_CONFIG_H
 
 #include "wsfs/adapter/api.h"
+#include "wsfs/adapter/authenticate.h"
 
 struct wsfs_server_config;
 
@@ -40,6 +41,13 @@ extern WSFSA_API void wsfs_server_config_set_port(
     struct wsfs_server_config * config,
 	int port);
 
+extern WSFSA_API void wsfs_server_add_authenticator(
+    struct wsfs_server_config * config,
+    char const * type,
+    wsfs_authenticate_fn * authenticate,
+    void * user_data
+);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/wsfs_adapter.h b/include/wsfs_adapter.h
index 6a812a3..6900f13 100644
--- a/include/wsfs_adapter.h
+++ b/include/wsfs_adapter.h
@@ -7,5 +7,7 @@
 #include <wsfs/adapter/server.h>
 #include <wsfs/adapter/server_config.h>
 #include <wsfs/adapter/server_protocol.h>
+#include <wsfs/adapter/authenticate.h>
+#include <wsfs/adapter/credentials.h>
 
 #endif
diff --git a/lib/wsfs/adapter/authenticator.c b/lib/wsfs/adapter/authenticator.c
new file mode 100644
index 0000000..04f1c60
--- /dev/null
+++ b/lib/wsfs/adapter/authenticator.c
@@ -0,0 +1,49 @@
+#include "wsfs/adapter/authenticator.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "wsfs/adapter/credentials_intern.h"
+
+struct wsfs_authenticator * wsfs_authenticator_create(
+    char const * type,
+    wsfs_authenticate_fn * authenticate,
+    void * user_data)
+{
+    struct wsfs_authenticator * authenticator = malloc(sizeof(struct wsfs_authenticator));
+    if (NULL != authenticator)
+    {
+        authenticator->type = strdup(type);
+        authenticator->authenticate = authenticate;
+        authenticator->user_data = user_data;
+        authenticator->next = NULL;
+    }
+
+    return authenticator;
+}
+
+void wsfs_authenticator_dispose(
+    struct wsfs_authenticator * authenticator)
+{
+    free(authenticator->type);
+    free(authenticator);
+}
+
+bool wsfs_authenticator_autenticate(
+    struct wsfs_authenticator * authenticator,
+    struct wsfs_credentials * credentials)
+{
+    bool result;
+
+    if (0 == strcmp(authenticator->type, credentials->type))
+    {
+        result = authenticator->authenticate(credentials, authenticator->user_data);
+    }
+    else
+    {
+        result = false;
+    }
+    
+
+    return result;
+}
\ No newline at end of file
diff --git a/lib/wsfs/adapter/authenticator.h b/lib/wsfs/adapter/authenticator.h
new file mode 100644
index 0000000..585cc24
--- /dev/null
+++ b/lib/wsfs/adapter/authenticator.h
@@ -0,0 +1,40 @@
+#ifndef WSFS_ADAPTER_AUTHENTICATOR_H
+#define WSFS_ADAPTER_AUTHENTICATOR_H
+
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+#include "wsfs/adapter/authenticate.h"
+
+struct wsfs_authenticator
+{
+    char * type;
+    wsfs_authenticate_fn * authenticate;
+    void * user_data;
+    struct wsfs_authenticator * next;
+};
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+extern struct wsfs_authenticator * wsfs_authenticator_create(
+    char const * type,
+    wsfs_authenticate_fn * authenticate,
+    void * user_data);
+
+extern void wsfs_authenticator_dispose(
+    struct wsfs_authenticator * authenticator);
+
+extern bool wsfs_authenticator_autenticate(
+    struct wsfs_authenticator * authenticator,
+    struct wsfs_credentials * credentials);
+
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/lib/wsfs/adapter/authenticators.c b/lib/wsfs/adapter/authenticators.c
new file mode 100644
index 0000000..aa59809
--- /dev/null
+++ b/lib/wsfs/adapter/authenticators.c
@@ -0,0 +1,101 @@
+#include "wsfs/adapter/authenticators.h"
+#include <stddef.h>
+#include <string.h>
+
+#include "wsfs/adapter/authenticator.h"
+#include "wsfs/adapter/credentials_intern.h"
+
+static struct wsfs_authenticator * wsfs_authenticators_find(
+    struct wsfs_authenticators * authenticators,
+    char const * type)
+{
+    struct wsfs_authenticator * result = NULL;
+
+    struct wsfs_authenticator * actual = authenticators->first;
+    while ((NULL == result) && (NULL != actual))
+    {
+        struct wsfs_authenticator * next = actual->next;
+        if (0 == strcmp(type, actual->type))
+        {
+            result = actual;
+        }
+
+        actual = next;
+    }
+
+    return result;
+}
+
+void wsfs_authenticators_init(
+    struct wsfs_authenticators * authenticators)
+{
+    authenticators->first = NULL;
+}
+
+void wsfs_authenticators_cleanup(
+    struct wsfs_authenticators * authenticators)
+{
+    struct wsfs_authenticator * actual = authenticators->first;
+    while (NULL != actual)
+    {
+        struct wsfs_authenticator * next = actual->next;
+        wsfs_authenticator_dispose(actual);
+        actual = next;
+    }
+
+    authenticators->first = NULL;
+}
+
+void wsfs_authenticators_clone(
+    struct wsfs_authenticators * authenticators,
+    struct wsfs_authenticators * other)
+{
+    wsfs_authenticators_init(other);
+
+    struct wsfs_authenticator * actual = authenticators->first;
+    while (NULL != actual)
+    {
+        struct wsfs_authenticator * next = actual->next;
+        wsfs_authenticators_add(other, 
+                actual->type, actual->authenticate, actual->user_data);
+        actual = next;
+    }
+
+}
+
+void wsfs_authenticators_add(
+    struct wsfs_authenticators * authenticators,
+    char const * type,
+    wsfs_authenticate_fn * authenticate,
+    void * user_data)
+{
+    struct wsfs_authenticator * authenticator = wsfs_authenticator_create(type, authenticate, user_data);
+    authenticator->next = authenticators->first;
+    authenticators->first = authenticator;
+}
+
+bool wsfs_authenticators_authenticate(
+    struct wsfs_authenticators * authenticators,
+    struct wsfs_credentials * credentials)
+{
+    bool result;
+
+    if (NULL != credentials)
+    {
+        struct wsfs_authenticator * authenticator = wsfs_authenticators_find(authenticators, credentials->type);
+        if (NULL != authenticator)
+        {
+            result = wsfs_authenticator_autenticate(authenticator, credentials);
+        }
+        else 
+        {
+            result = false;
+        }
+    }
+    else
+    {
+        result = (NULL == authenticators->first);
+    }
+
+    return result;
+}
\ No newline at end of file
diff --git a/lib/wsfs/adapter/authenticators.h b/lib/wsfs/adapter/authenticators.h
new file mode 100644
index 0000000..c7cadf6
--- /dev/null
+++ b/lib/wsfs/adapter/authenticators.h
@@ -0,0 +1,38 @@
+#ifndef WSFS_ADAPTER_AUTHENTICATORS_H
+#define WSFS_ADAPTER_AUTHENTICATORS_H
+
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+#include "wsfs/adapter/authenticate.h"
+
+struct wsfs_authenticator;
+struct wsfs_credentials;
+
+struct wsfs_authenticators
+{
+    struct wsfs_authenticator * first;
+};
+
+extern void wsfs_authenticators_init(
+    struct wsfs_authenticators * authenticators);
+
+extern void wsfs_authenticators_cleanup(
+    struct wsfs_authenticators * authenticators);
+
+extern void wsfs_authenticators_clone(
+    struct wsfs_authenticators * authenticators,
+    struct wsfs_authenticators * other);
+
+extern void wsfs_authenticators_add(
+    struct wsfs_authenticators * authenticators,
+    char const * type,
+    wsfs_authenticate_fn * authenticate,
+    void * user_data);
+
+extern bool wsfs_authenticators_authenticate(
+    struct wsfs_authenticators * authenticators,
+    struct wsfs_credentials * credentials);
+
+#endif
diff --git a/lib/wsfs/adapter/credentials.c b/lib/wsfs/adapter/credentials.c
new file mode 100644
index 0000000..40df93f
--- /dev/null
+++ b/lib/wsfs/adapter/credentials.c
@@ -0,0 +1,40 @@
+#include "wsfs/adapter/credentials_intern.h"
+#include <string.h>
+
+void wsfs_credentials_init(
+    struct wsfs_credentials * credentials,
+    char const * type,
+    json_t * data)
+{
+    credentials->type = strdup(type);
+    credentials->data = data;
+    json_incref(credentials->data);
+}
+
+void wsfs_credentails_cleanup(
+    struct wsfs_credentials * credentials)
+{
+    free(credentials->type);
+    json_decref(credentials->data);
+}
+
+char const * wsfs_credentials_type(
+    struct wsfs_credentials const * credentials)
+{
+    return credentials->type;
+}
+
+char const * wsfs_credentials_get(
+    struct wsfs_credentials const * credentials,
+    char const * key)
+{
+    char const * result = NULL;
+
+    json_t * value_holder = json_object_get(credentials->data, key);
+    if (json_is_string(value_holder))
+    {
+        result = json_string_value(value_holder);
+    }
+
+    return result;
+}
diff --git a/lib/wsfs/adapter/credentials_intern.h b/lib/wsfs/adapter/credentials_intern.h
new file mode 100644
index 0000000..d0c6f44
--- /dev/null
+++ b/lib/wsfs/adapter/credentials_intern.h
@@ -0,0 +1,30 @@
+#ifndef WSFS_ADAPTER_CREDENTIALS_INTERN_H
+#define WSFS_ADAPTER_CREDENTIALS_INTERN_H
+
+#include "wsfs/adapter/credentials.h"
+#include <jansson.h>
+
+struct wsfs_credentials
+{
+    char * type;
+    json_t * data;
+};
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+extern void wsfs_credentials_init(
+    struct wsfs_credentials * credentials,
+    char const * type,
+    json_t * data);
+
+extern void wsfs_credentails_cleanup(
+    struct wsfs_credentials * credentials);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
\ No newline at end of file
diff --git a/lib/wsfs/adapter/server_config.c b/lib/wsfs/adapter/server_config.c
index 13e1f37..d4602bd 100644
--- a/lib/wsfs/adapter/server_config.c
+++ b/lib/wsfs/adapter/server_config.c
@@ -18,11 +18,15 @@ void wsfs_server_config_init(
     struct wsfs_server_config * config)
 {
     memset(config, 0, sizeof(struct wsfs_server_config));
+
+    wsfs_authenticators_init(&config->authenticators);
 }
 
 void wsfs_server_config_cleanup(
     struct wsfs_server_config * config)
 {
+    wsfs_authenticators_cleanup(&config->authenticators);
+
     free(config->mount_point);
 	free(config->document_root);
 	free(config->key_path);
@@ -42,6 +46,8 @@ void wsfs_server_config_clone(
 	clone->cert_path = wsfs_server_config_strdup(config->cert_path);
 	clone->vhost_name = wsfs_server_config_strdup(config->vhost_name);
 	clone->port = config->port;
+
+    wsfs_authenticators_clone(&config->authenticators, &clone->authenticators);
 }
 
 struct wsfs_server_config * wsfs_server_config_create(void)
@@ -108,3 +114,13 @@ void wsfs_server_config_set_port(
 {
     config->port = port;
 }
+
+void wsfs_server_add_authenticator(
+    struct wsfs_server_config * config,
+    char const * type,
+    wsfs_authenticate_fn * authenticate,
+    void * user_data
+)
+{
+    wsfs_authenticators_add(&config->authenticators, type, authenticate, user_data);
+}
\ No newline at end of file
diff --git a/lib/wsfs/adapter/server_config_intern.h b/lib/wsfs/adapter/server_config_intern.h
index 941ac8a..2ae0a2f 100644
--- a/lib/wsfs/adapter/server_config_intern.h
+++ b/lib/wsfs/adapter/server_config_intern.h
@@ -2,6 +2,7 @@
 #define WSFS_ADAPTER_SERVER_CONFIG_INTERN_H
 
 #include "wsfs/adapter/server_config.h"
+#include "wsfs/adapter/authenticators.h"
 
 struct wsfs_server_config
 {
@@ -11,6 +12,7 @@ struct wsfs_server_config
 	char * cert_path;
 	char * vhost_name;
 	int port;
+	struct wsfs_authenticators authenticators;
 };
 
 #ifdef __cplusplus
diff --git a/lib/wsfs/provider/operation/getattr.c b/lib/wsfs/provider/operation/getattr.c
index c4be838..90aefa0 100644
--- a/lib/wsfs/provider/operation/getattr.c
+++ b/lib/wsfs/provider/operation/getattr.c
@@ -32,7 +32,7 @@ void wsfsp_getattr_default(
     ino_t WSFS_UNUSED_PARAM(inode),
     void * WSFS_UNUSED_PARAM(user_data))
 {
-    wsfsp_respond_error(request, -1);
+    wsfsp_respond_error(request, WSFS_BAD_NOENTRY);
 }
 
 void wsfsp_respond_getattr(