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global: combine all permissions of the object tree

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To get the permissions of an object, combine the permissions
of the object and all the parent nodes up to the root.

This is necessary to enforce that a client can never see and
object id (in this case the parent id) it is not allowed to see.
This commit is contained in:
Wim Taymans 2019-05-13 15:46:32 +02:00
parent 23d0b9e5e2
commit 9221b8dedd
1 changed files with 9 additions and 3 deletions
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12
src/pipewire/global.c
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@ -45,11 +45,17 @@ struct impl {
SPA_EXPORT
uint32_t pw_global_get_permissions(struct pw_global *global, struct pw_client *client)
{
uint32_t perms = PW_PERM_RWX;
uint32_t perms;
if (client->permission_func != NULL)
if (client->permission_func == NULL)
return PW_PERM_RWX;
perms = client->permission_func(global, client, client->permission_data);
while (global != global->parent) {
global = global->parent;
perms &= client->permission_func(global, client, client->permission_data);
}
return perms;
}