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file-backend: Extract TPM code into separate function

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That way, we have a function we can also call in case we want to provide
a synchronous constructor.

This also fixes some cases where the `EggTpm2Context` was not properly
cleaned up in case of some error paths.
This commit is contained in:
Niels De Graef 2022-05-21 20:53:36 +02:00
parent 7b461f5514
commit 7d7c1b3430
1 changed files with 78 additions and 79 deletions
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155
libsecret/secret-file-backend.c
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@ -464,6 +464,77 @@ on_bus_get (GObject *source_object,
g_object_unref (fd_list);
}
#ifdef WITH_TPM
static GBytes *
load_password_from_tpm (GFile *file, GCancellable *cancellable, GError **error)
{
EggTpm2Context *context = NULL;
char *path = NULL;
char *tpm2_file_path = NULL;
GFile *tpm2_file = NULL;
gboolean status;
GBytes *encrypted = NULL;
GBytes *decrypted = NULL;
context = egg_tpm2_initialize (error);
if (!context)
return NULL;
path = g_file_get_path (file);
tpm2_file_path = g_strdup_printf ("%s.tpm2", path);
g_free (path);
tpm2_file = g_file_new_for_path (tpm2_file_path);
status = g_file_test (tpm2_file_path, G_FILE_TEST_EXISTS);
g_free (tpm2_file_path);
if (!status) {
gconstpointer contents;
gsize size;
encrypted = egg_tpm2_generate_master_password (context, error);
if (!encrypted)
return NULL;
contents = g_bytes_get_data (encrypted, &size);
status = g_file_replace_contents (tpm2_file,
contents,
size,
NULL,
FALSE,
G_FILE_CREATE_PRIVATE,
NULL,
cancellable,
error);
if (!status)
goto out;
} else {
char *contents;
gsize length;
status = g_file_load_contents (tpm2_file,
cancellable,
&contents,
&length,
NULL,
error);
if (!status)
goto out;
encrypted = g_bytes_new_take (contents, length);
}
decrypted = egg_tpm2_decrypt_master_password (context, encrypted, error);
out:
g_clear_object (&tpm2_file);
g_clear_pointer (&encrypted, g_bytes_unref);
egg_tpm2_finalize (context);
return decrypted;
}
#endif /* WITH_TPM */
static void
secret_file_backend_real_init_async (GAsyncInitable *initable,
int io_priority,
@ -508,90 +579,19 @@ secret_file_backend_real_init_async (GAsyncInitable *initable,
g_bus_get (G_BUS_TYPE_SESSION, cancellable, on_bus_get, task);
} else {
#ifdef WITH_TPM
EggTpm2Context *context;
GFile *tpm2_file;
gchar *tpm2_file_path;
gboolean status;
GBytes *encrypted;
GBytes *decrypted;
context = egg_tpm2_initialize (&error);
if (!context) {
g_task_return_error (task, error);
g_object_unref (task);
return;
}
path = g_file_get_path (file);
tpm2_file_path = g_strdup_printf ("%s.tpm2", path);
g_free(path);
tpm2_file = g_file_new_for_path (tpm2_file_path);
status = g_file_test (tpm2_file_path, G_FILE_TEST_EXISTS);
g_free (tpm2_file_path);
if (!status) {
encrypted = egg_tpm2_generate_master_password (
context,
&error);
if (!encrypted) {
g_task_return_error (task, error);
g_object_unref (task);
return;
}
gconstpointer contents;
GBytes *decrypted = NULL;
gconstpointer data;
gsize size;
contents = g_bytes_get_data (encrypted, &size);
status = g_file_replace_contents (tpm2_file,
contents,
size,
NULL,
FALSE,
G_FILE_CREATE_PRIVATE,
NULL,
cancellable,
&error);
if (!status) {
g_task_return_error (task, error);
g_object_unref (task);
return;
}
} else {
char *contents;
gsize length;
status = g_file_load_contents (tpm2_file,
cancellable,
&contents,
&length,
NULL,
&error);
if (!status) {
g_task_return_error (task, error);
g_object_unref (task);
return;
}
encrypted = g_bytes_new_take (contents, length);
}
decrypted = egg_tpm2_decrypt_master_password (context,
encrypted,
&error);
g_bytes_unref (encrypted);
egg_tpm2_finalize (context);
decrypted = load_password_from_tpm (file, cancellable, &error);
if (!decrypted) {
g_task_return_error (task, error);
g_object_unref (task);
return;
}
gconstpointer data;
gsize size;
data = g_bytes_get_data(decrypted, &size);
password = secret_value_new (data,
size,
"text/plain");
data = g_bytes_get_data (decrypted, &size);
password = secret_value_new (data,size, "text/plain");
g_bytes_unref (decrypted);
g_async_initable_new_async (SECRET_TYPE_FILE_COLLECTION,
io_priority,
@ -602,16 +602,15 @@ secret_file_backend_real_init_async (GAsyncInitable *initable,
"password", password,
NULL);
g_object_unref (tpm2_file);
g_object_unref (file);
secret_value_unref (password);
return;
#else
g_task_return_new_error (task,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"master password is not retrievable");
g_object_unref (task);
return;
#endif
}
}