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secret-backend: New interface to represent password storage backend

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This interface provides a separation between the
frontend (secret_password*) and the backend (SecretService).  That
makes it easier to replace SecretService with a custom backend
implementation.
This commit is contained in:
Daiki Ueno 2019-06-29 16:56:03 +02:00 committed by Daiki Ueno
parent e6456698ec
commit a0d10597ee
6 changed files with 412 additions and 0 deletions
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14
docs/reference/libsecret/libsecret-sections.txt
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@ -366,6 +366,20 @@ secret_attributes_buildv
<FILE>SecretGenPrompt</FILE>
</SECTION>
<SECTION>
<FILE>secret-backend</FILE>
SECRET_BACKEND_EXTENSION_POINT_NAME
SECRET_TYPE_BACKEND
SECRET_TYPE_BACKEND_FLAGS
SECRET_TYPE_SCHEMA_TYPE
SecretBackend
SecretBackendFlags
SecretBackendInterface
secret_backend_flags_get_type
secret_backend_get
secret_backend_get_finish
</SECTION>
<SECTION>
<FILE>secret-version</FILE>
SECRET_CHECK_VERSION

2
libsecret/Makefile.am
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@ -7,6 +7,7 @@ incdir = $(includedir)/libsecret-@SECRET_MAJOR@/libsecret
libsecret_HEADS = \
libsecret/secret.h \
libsecret/secret-attributes.h \
libsecret/secret-backend.h \
libsecret/secret-collection.h \
libsecret/secret-item.h \
libsecret/secret-password.h \
@ -38,6 +39,7 @@ libsecret_BUILT = \
libsecret_PUBLIC = \
libsecret/secret-attributes.h libsecret/secret-attributes.c \
libsecret/secret-backend.h libsecret/secret-backend.c \
libsecret/secret-collection.h libsecret/secret-collection.c \
libsecret/secret-item.h libsecret/secret-item.c \
libsecret/secret-methods.c \

6
libsecret/Secret-1.metadata
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@ -66,3 +66,9 @@ Service
.prompt_at_dbus_path_sync skip=false nullable=true
.prompt_at_dbus_path skip=false
.prompt_at_dbus_path_finish skip=false nullable=true
Backend
.store skip=true
.lookup skip=true
.clear skip=true
.search skip=true

2
libsecret/meson.build
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@ -2,6 +2,7 @@ installed_headers_subdir = 'libsecret-@0@'.format(api_version_major) / 'libsecre
libsecret_sources = [
'secret-attributes.c',
'secret-backend.c',
'secret-collection.c',
'secret-item.c',
'secret-methods.c',
@ -20,6 +21,7 @@ libsecret_sources = [
libsecret_headers = [
'secret.h',
'secret-attributes.h',
'secret-backend.h',
'secret-collection.h',
'secret-item.h',
'secret-password.h',

277
libsecret/secret-backend.c Normal file
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@ -0,0 +1,277 @@
/* libsecret - GLib wrapper for Secret Service
*
* Copyright 2019 Red Hat, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the licence or (at
* your option) any later version.
*
* See the included COPYING file for more information.
*
* Author: Daiki Ueno
*/
#include "config.h"
#include "secret-backend.h"
#include "secret-private.h"
#include "libsecret/secret-enum-types.h"
/**
* SECTION:secret-backend
* @title: SecretBackend
* @short_description: A backend implementation of password storage
*
* #SecretBackend represents a backend implementation of password
* storage.
*
* Stability: Stable
*/
/**
* SecretBackend:
*
* An object representing a backend implementation of password storage.
*
* Since: 0.19.0
*/
/**
* SecretBackendInterface:
* @parent_iface: the parent interface
* @ensure_for_flags: implementation of reinitialization step in constructor, optional
* @ensure_for_flags_finish: implementation of reinitialization step in constructor, optional
* @store: implementation of secret_password_store(), required
* @store_finish: implementation of secret_password_store_finish(), required
* @lookup: implementation of secret_password_lookup(), required
* @lookup_finish: implementation of secret_password_lookup_finish(), required
* @clear: implementation of secret_password_clear(), required
* @clear_finish: implementation of secret_password_clear_finish(), required
* @search: implementation of secret_password_search(), required
* @search_finish: implementation of secret_password_search_finish(), required
*
* The interface for #SecretBackend.
*
* Since: 0.19.0
*/
/**
* SecretBackendFlags:
* @SECRET_BACKEND_NONE: no flags for initializing the #SecretBackend
* @SECRET_BACKEND_OPEN_SESSION: establish a session for transfer of secrets
* while initializing the #SecretBackend
* @SECRET_BACKEND_LOAD_COLLECTIONS: load collections while initializing the
* #SecretBackend
*
* Flags which determine which parts of the #SecretBackend are initialized.
*
* Since: 0.19.0
*/
G_DEFINE_INTERFACE_WITH_CODE (SecretBackend, secret_backend, G_TYPE_OBJECT,
g_type_interface_add_prerequisite(g_define_type_id, G_TYPE_ASYNC_INITABLE);
);
static void
secret_backend_default_init (SecretBackendInterface *iface)
{
/**
* SecretBackend:flags:
*
* A set of flags describing which parts of the secret backend have
* been initialized.
*
* Since: 0.19.0
*/
g_object_interface_install_property (iface,
g_param_spec_flags ("flags", "Flags", "Service flags",
secret_service_flags_get_type (), SECRET_SERVICE_NONE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
}
void
_secret_backend_ensure_extension_point (void)
{
GIOExtensionPoint *ep;
static gboolean registered = FALSE;
if (registered)
return;
ep = g_io_extension_point_register (SECRET_BACKEND_EXTENSION_POINT_NAME);
g_io_extension_point_set_required_type (ep, SECRET_TYPE_BACKEND);
registered = TRUE;
}
G_LOCK_DEFINE (backend_instance);
static gpointer backend_instance = NULL;
static SecretBackend *
backend_get_instance (void)
{
SecretBackend *instance = NULL;
G_LOCK (backend_instance);
if (backend_instance != NULL)
instance = g_object_ref (backend_instance);
G_UNLOCK (backend_instance);
return instance;
}
static GType
backend_get_impl_type (void)
{
const gchar *envvar = g_getenv ("SECRET_BACKEND");
const gchar *extension_name;
GIOExtension *e;
GIOExtensionPoint *ep;
if (envvar == NULL || *envvar == '\0')
extension_name = "service";
else
extension_name = envvar;
ep = g_io_extension_point_lookup (SECRET_BACKEND_EXTENSION_POINT_NAME);
e = g_io_extension_point_get_extension_by_name (ep, extension_name);
if (e == NULL) {
g_warning ("Backend extension \"%s\" from SECRET_BACKEND_EXTENSION_POINT_NAME environment variable not found.", extension_name);
return G_TYPE_NONE;
}
return g_io_extension_get_type (e);
}
static void
on_ensure_for_flags (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
SecretBackendInterface *iface;
SecretBackend *self = SECRET_BACKEND (source_object);
GTask *task = G_TASK (user_data);
GError *error = NULL;
iface = SECRET_BACKEND_GET_IFACE (self);
if (iface->ensure_for_flags_finish) {
if (!iface->ensure_for_flags_finish (self, result, &error)) {
g_task_return_error (task, error);
g_object_unref (task);
return;
}
}
g_task_return_boolean (task, TRUE);
g_object_unref (task);
}
/**
* secret_backend_get:
* @flags: flags for which service functionality to ensure is initialized
* @cancellable: optional cancellation object
* @callback: called when the operation completes
* @user_data: data to be passed to the callback
*
* Get a #SecretBackend instance. If such a backend already exists,
* then the same backend is returned.
*
* If @flags contains any flags of which parts of the secret backend to
* ensure are initialized, then those will be initialized before completing.
*
* This method will return immediately and complete asynchronously.
*
* Since: 0.19.0
*/
void
secret_backend_get (SecretBackendFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
SecretBackend *backend = NULL;
SecretBackendInterface *iface;
GTask *task;
backend = backend_get_instance ();
/* Create a whole new backend */
if (backend == NULL) {
GType impl_type = backend_get_impl_type ();
g_return_if_fail (g_type_is_a (impl_type, G_TYPE_ASYNC_INITABLE));
g_async_initable_new_async (impl_type,
G_PRIORITY_DEFAULT,
cancellable, callback, user_data,
"flags", flags,
NULL);
/* Just have to ensure that the backend matches flags */
} else {
task = g_task_new (backend, cancellable, callback, user_data);
iface = SECRET_BACKEND_GET_IFACE (backend);
if (iface->ensure_for_flags) {
g_task_set_source_tag (task, secret_backend_get);
iface->ensure_for_flags (backend, flags, cancellable,
on_ensure_for_flags, task);
} else {
g_task_return_boolean (task, TRUE);
g_object_unref (task);
}
g_object_unref (backend);
}
}
/**
* secret_backend_get_finish:
* @result: the asynchronous result passed to the callback
* @error: location to place an error on failure
*
* Complete an asynchronous operation to get a #SecretBackend.
*
* Returns: (transfer full): a new reference to a #SecretBackend proxy, which
* should be released with g_object_unref().
*
* Since: 0.19.0
*/
SecretBackend *
secret_backend_get_finish (GAsyncResult *result,
GError **error)
{
GTask *task;
GObject *backend = NULL;
GObject *source_object;
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
task = G_TASK (result);
source_object = g_task_get_source_object (task);
g_return_val_if_fail (g_task_is_valid (result, source_object), NULL);
/* Just ensuring that the backend matches flags */
if (g_task_get_source_tag (task) == secret_backend_get) {
if (g_task_had_error (task)) {
g_task_propagate_pointer (task, error);
} else {
backend = g_object_ref (source_object);
}
/* Creating a whole new backend */
} else {
backend = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object), result, error);
if (backend) {
G_LOCK (backend_instance);
if (backend_instance == NULL)
backend_instance = backend;
G_UNLOCK (backend_instance);
}
}
if (backend == NULL)
return NULL;
return SECRET_BACKEND (backend);
}

111
libsecret/secret-backend.h Normal file
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@ -0,0 +1,111 @@
/* libsecret - GLib wrapper for Secret Service
*
* Copyright 2019 Red Hat, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the licence or (at
* your option) any later version.
*
* See the included COPYING file for more information.
*
* Author: Daiki Ueno
*/
#if !defined (__SECRET_INSIDE_HEADER__) && !defined (SECRET_COMPILATION)
#error "Only <libsecret/secret.h> can be included directly."
#endif
#ifndef __SECRET_BACKEND_H__
#define __SECRET_BACKEND_H__
#include <glib-object.h>
#include "secret-schema.h"
#include "secret-service.h"
#include "secret-value.h"
G_BEGIN_DECLS
typedef enum {
SECRET_BACKEND_NONE = SECRET_SERVICE_NONE,
SECRET_BACKEND_OPEN_SESSION = SECRET_SERVICE_OPEN_SESSION,
SECRET_BACKEND_LOAD_COLLECTIONS = SECRET_SERVICE_LOAD_COLLECTIONS,
} SecretBackendFlags;
#define SECRET_TYPE_BACKEND secret_backend_get_type ()
G_DECLARE_INTERFACE (SecretBackend, secret_backend, SECRET, BACKEND, GObject)
struct _SecretBackendInterface
{
GTypeInterface parent_iface;
void (*ensure_for_flags) (SecretBackend *self,
SecretBackendFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gboolean (*ensure_for_flags_finish) (SecretBackend *self,
GAsyncResult *result,
GError **error);
void (*store) (SecretBackend *self,
const SecretSchema *schema,
GHashTable *attributes,
const gchar *collection,
const gchar *label,
SecretValue *value,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gboolean (*store_finish) (SecretBackend *self,
GAsyncResult *result,
GError **error);
void (*lookup) (SecretBackend *self,
const SecretSchema *schema,
GHashTable *attributes,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
SecretValue *(*lookup_finish) (SecretBackend *self,
GAsyncResult *result,
GError **error);
void (*clear) (SecretBackend *self,
const SecretSchema *schema,
GHashTable *attributes,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gboolean (*clear_finish) (SecretBackend *self,
GAsyncResult *result,
GError **error);
void (*search) (SecretBackend *self,
const SecretSchema *schema,
GHashTable *attributes,
SecretSearchFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GList * (*search_finish) (SecretBackend *self,
GAsyncResult *result,
GError **error);
};
#define SECRET_BACKEND_EXTENSION_POINT_NAME "secret-backend"
void _secret_backend_ensure_extension_point
(void);
void secret_backend_get (SecretBackendFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
SecretBackend *secret_backend_get_finish (GAsyncResult *result,
GError **error);
G_END_DECLS
#endif /* __SECRET_BACKEND_H__ */