The semantics of this call allowed it to be called more than once when
parsing a message to restart a parse. This is not likely to be
useful in practice, and it also makes reading file descriptors
more complicated. Consequently this function has been removed and
replaced with with libipm_msg_in_get_msgno()
Update sesman to cope with separate authentication/authorization (AA) and
command processing.
Also, internally users are now tracked by UID rather thn username.
This addresses a problem found by some users using federated naming
services (e.g. Active Directory) where the same user can be referred to
in more than one way. See https://github.com/neutrinolabs/xrdp/issues/1823
The separation of AA in this way allows for multiple attempts to be made
on one connection to get a password right. This addresses MaxLoginRetry
not working (https://github.com/neutrinolabs/xrdp/issues/1739)
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.
The connected client is currently described in two places in
the xrdp_client_info structure:-
1) In the connection_description field. This was introduced as
field client_ip by commit d797b2cf49
for xrdp v0.6.0
2) In the client_addr and client_port fields introduced by commit
25369460a1 for xrdp v0.8.0
This commit unifies these two sets of fields into a single
set of fields describing the connection IP and port (for
AF_INET/AF_INET6 connections only) and a connection description
for all connection types.
The code in os_calls to provide client logging has been simplified
somewhat which should make it easier to add new connection types (e.g.
AF_VSOCK).
The old connection_description field used to be passed to sesman to
inform sesman of the IP address of the client, and also to provide
a string for 'C' field session policy matching. 'C' field session policy
matching does not actually need this string (see #2239), and so now only
the IP field is passed to sesman.
