This allows Linux's no_new_privs restriction to be disabled when starting
the X server, which may be desirable if xrdp is running inside a kernel
confinement framework such as AppArmor or SELinux.
When allocating a display number, we should be aware that
IANA only allow TCP displays up to :63. This PR adds that restriction in
to sesman.ini as a default, to prevent us allocating unavailable TCP
ports.
By default TCP ports are not enabled for X servers, but users can easily
change this if they wish to access X displays directly over the network.
This restriction is in addition to the MaxSessions limit already present
in sesman.ini
By setting the new config value 'AllowAlternateShell' to 'no' it is now
possible to prevent the use of an alternate shell, which can be set by
the connecting user.
The default remains unchanged and any shell is allowed if the config
value is not specified. It can also be set explicitly to 'yes' to achieve
the same outcome.
Fixes: #850
Made session allocation policies more readable and maintainable.
The 'C' policy which was confusing before has been replaced with the
'Separate' keyword. This is a public interface change, but is unlikely
to affect many users.
The logging in session_get_bydata() is substantially improved, making
it far easier to spot why sessions are getting matched or not matched.
The TCP socket implementation of sesman has a number of limitations,
namely that it is affected by firewalls, and also that determining the
user on the other end requires a full authentication process.
The advantage of the TCP socket is that sesman and xrdp can be run on
separate machines. This is however not supported by the xorgxrdp
backend (shared memory), and is insecure, in that passwords are sent
in-the-clear, and the connection is susceptible to MitM attacks. This
architecture has been deprecated in release notes since xrdp v0.9.17,
and although it will continue to be supported in any further releases
in the x0.9.x series, it will not be supported in the next major
version.
This commit adds:
* replace multiple logging macros with LOG and LOG_DEVEL
* logging configuration for chanserv
* logging configuration for console output
* logging configuration for per file or method log level filtering for
debug builds
* file, line, and method name in log message for debug builds
- Reimplemented inode store in separate module chansrv_xfs.[hc]
- Allowed atimes and mtimes to be written to Windows side
- Mapped file user write bit to (inverted) Windows FILE_ATTRIBUTE_READONLY bit
- Mapped file user execute bit to Windows FILE_ATTRIBUTE_SYSTEM bit
- Implemented improved security for remotely mounted drives
- Implemented USB device removal, allowing hot-plug/remove of memory sticks
- Fixed pagefile.sys breaking Ubuntu file browser
- Fixed write offset bug
- Allowed renaming of open files
- Improved reported error codes
- Fixed various memory leaks
- Addressed valgrind errors related to struct fuse_file_info pointers.
as it is already deprecated. x11rdp is complicated to build and very few
people using it actually. However, some people still select "X11rdp"
session and get stuck despite not installing x11rdp.
https://github.com/neutrinolabs/xrdp/issues/962#issuecomment-430545526
People who really want to use x11rdp should revert this commit.
Daniel Richard G