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flatpak-proxy: Use more g_autoptr/g_autofree
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This also fixes a few cases where the message is no unreffed if the
arguments are unexpected.

Signed-off-by: Sebastian Wick <[email protected]>
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@swick @GeorgesStavracas
swick authored and GeorgesStavracas committed Apr 26, 2024
1 parent 855dfeb commit 03bec4a
Showing 1 changed file with 46 additions and 53 deletions.
99 changes: 46 additions & 53 deletions flatpak-proxy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2071,31 +2071,28 @@ policy_from_handler (BusHandler handler)
static char *
get_arg0_string (Buffer *buffer)
{
GDBusMessage *message = g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
g_autoptr(GDBusMessage) message =
g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
GVariant *body;

g_autoptr(GVariant) arg0 = NULL;
char *name = NULL;

if (message != NULL &&
(body = g_dbus_message_get_body (message)) != NULL &&
(arg0 = g_variant_get_child_value (body, 0)) != NULL &&
g_variant_is_of_type (arg0, G_VARIANT_TYPE_STRING))
name = g_variant_dup_string (arg0, NULL);

g_object_unref (message);
return g_variant_dup_string (arg0, NULL);

return name;
return NULL;
}

static gboolean
validate_arg0_match (FlatpakProxyClient *client, Buffer *buffer)
{
GDBusMessage *message = g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
g_autoptr(GDBusMessage) message =
g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
GVariant *body;
g_autoptr(GVariant) arg0 = NULL;
const char *match;
gboolean res = TRUE;

if (message != NULL &&
(body = g_dbus_message_get_body (message)) != NULL &&
Expand All @@ -2104,22 +2101,21 @@ validate_arg0_match (FlatpakProxyClient *client, Buffer *buffer)
{
match = g_variant_get_string (arg0, NULL);
if (strstr (match, "eavesdrop=") != NULL)
res = FALSE;
return FALSE;
}

g_object_unref (message);
return res;
return TRUE;
}

static gboolean
validate_arg0_name (FlatpakProxyClient *client, Buffer *buffer, FlatpakPolicy required_policy, FlatpakPolicy *has_policy)
{
GDBusMessage *message = g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
g_autoptr(GDBusMessage) message =
g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
GVariant *body;
g_autoptr(GVariant) arg0 = NULL;
const char *name;
FlatpakPolicy name_policy;
gboolean res = FALSE;

if (has_policy)
*has_policy = FLATPAK_POLICY_NONE;
Expand All @@ -2136,19 +2132,20 @@ validate_arg0_name (FlatpakProxyClient *client, Buffer *buffer, FlatpakPolicy re
*has_policy = name_policy;

if (name_policy >= required_policy)
res = TRUE;
else if (client->proxy->log_messages)
return TRUE;

if (client->proxy->log_messages)
g_print ("Filtering message due to arg0 %s, policy: %d (required %d)\n", name, name_policy, required_policy);
}

g_object_unref (message);
return res;
return FALSE;
}

static Buffer *
filter_names_list (FlatpakProxyClient *client, Buffer *buffer)
{
GDBusMessage *message = g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
g_autoptr(GDBusMessage) message =
g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
GVariant *body, *new_names;
g_autoptr(GVariant) arg0 = NULL;
const gchar **names;
Expand Down Expand Up @@ -2177,7 +2174,6 @@ filter_names_list (FlatpakProxyClient *client, Buffer *buffer)
g_variant_new_tuple (&new_names, 1));

filtered = message_to_buffer (message);
g_object_unref (message);
return filtered;
}

Expand All @@ -2195,13 +2191,13 @@ message_is_name_owner_changed (FlatpakProxyClient *client, Header *header)
static gboolean
should_filter_name_owner_changed (FlatpakProxyClient *client, Buffer *buffer)
{
GDBusMessage *message = g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
g_autoptr(GDBusMessage) message =
g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
GVariant *body;
g_autoptr(GVariant) arg0 = NULL;
g_autoptr(GVariant) arg1 = NULL;
g_autoptr(GVariant) arg2 = NULL;
const gchar *name, *new;
gboolean filter = TRUE;

if (message == NULL ||
(body = g_dbus_message_get_body (message)) == NULL ||
Expand All @@ -2225,12 +2221,10 @@ should_filter_name_owner_changed (FlatpakProxyClient *client, Buffer *buffer)
flatpak_proxy_client_add_unique_id_owned_name (client, new, name);
}

filter = FALSE;
return FALSE;
}

g_object_unref (message);

return filter;
return TRUE;
}

static GList *
Expand Down Expand Up @@ -2394,42 +2388,41 @@ queue_initial_name_ops (FlatpakProxyClient *client)
static void
queue_wildcard_initial_name_ops (FlatpakProxyClient *client, Header *header, Buffer *buffer)
{
GDBusMessage *decoded_message = g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
g_autoptr(GDBusMessage) decoded_message =
g_dbus_message_new_from_blob (buffer->data, buffer->size, 0, NULL);
GVariant *body;
g_autoptr(GVariant) arg0 = NULL;
g_autofree const gchar **names = NULL;
int i;

if (decoded_message != NULL &&
header->type == G_DBUS_MESSAGE_TYPE_METHOD_RETURN &&
(body = g_dbus_message_get_body (decoded_message)) != NULL &&
(arg0 = g_variant_get_child_value (body, 0)) != NULL &&
g_variant_is_of_type (arg0, G_VARIANT_TYPE_STRING_ARRAY))
if (decoded_message == NULL ||
header->type != G_DBUS_MESSAGE_TYPE_METHOD_RETURN ||
(body = g_dbus_message_get_body (decoded_message)) == NULL ||
(arg0 = g_variant_get_child_value (body, 0)) == NULL ||
!g_variant_is_of_type (arg0, G_VARIANT_TYPE_STRING_ARRAY))
return;

names = g_variant_get_strv (arg0, NULL);

/* Loop over all current names and get the owner for all the ones that match our rules
policies so that we can update the unique id policies for those */
for (i = 0; names[i] != NULL; i++)
{
const gchar **names = g_variant_get_strv (arg0, NULL);
int i;
const char *name = names[i];

/* Loop over all current names and get the owner for all the ones that match our rules
policies so that we can update the unique id policies for those */
for (i = 0; names[i] != NULL; i++)
if (name[0] != ':' &&
flatpak_proxy_client_get_max_policy (client, name) != FLATPAK_POLICY_NONE)
{
const char *name = names[i];

if (name[0] != ':' &&
flatpak_proxy_client_get_max_policy (client, name) != FLATPAK_POLICY_NONE)
{
/* Get the current owner of the name (if any) so we can apply policy to it */
GDBusMessage *message = g_dbus_message_new_method_call ("org.freedesktop.DBus", "/", "org.freedesktop.DBus", "GetNameOwner");
g_dbus_message_set_body (message, g_variant_new ("(s)", name));
queue_fake_message (client, message, EXPECTED_REPLY_FAKE_GET_NAME_OWNER);
g_hash_table_replace (client->get_owner_reply, GINT_TO_POINTER (client->last_serial), g_strdup (name));
/* Get the current owner of the name (if any) so we can apply policy to it */
GDBusMessage *message = g_dbus_message_new_method_call ("org.freedesktop.DBus", "/", "org.freedesktop.DBus", "GetNameOwner");
g_dbus_message_set_body (message, g_variant_new ("(s)", name));
queue_fake_message (client, message, EXPECTED_REPLY_FAKE_GET_NAME_OWNER);
g_hash_table_replace (client->get_owner_reply, GINT_TO_POINTER (client->last_serial), g_strdup (name));

if (client->proxy->log_messages)
g_print ("C%d: -> org.freedesktop.DBus fake GetNameOwner for %s\n", client->last_serial, name);
}
if (client->proxy->log_messages)
g_print ("C%d: -> org.freedesktop.DBus fake GetNameOwner for %s\n", client->last_serial, name);
}
g_free (names);
}

g_object_unref (decoded_message);
}


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