An extra method auth_uds() is added to the PAM module to
allow a 'struct auth_info' to be created for a UDS login. The PAM stack
is used to check the UDS user can be authorized.
Also, an error code is returned from the auth module rather than a
simple boolean. This allows a more complete status to be communicated
to the user. See https://github.com/neutrinolabs/xrdp/discussions/1921
and also #909 and #642
The loadable sesman authentication modules use different types for the
authentication handle returned from auth_userpass(). The PAM module
uses a pointer, and the other modules use (effectively) a boolean. Within
sesman itself, a long or tbus (intptr_t) is used.
This PR replaces all of these types with a pointer to an incomplete type.
Consequently:-
- A single better-labelled type is used it all places within sesman so
it's more obvious what's being handled.
- There is no need to cast the authentication handle within the PAM
module to a long and back again.
- The compiler can check function signatures between auth.h and the
various verify modules.
matt335672