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<HTML><HEAD><TITLE>Xlib Programming Manual: Controlling Host Access</TITLE></HEAD><BODY><H1 ALIGN=center>9.8 Controlling Host Access</H1><P>This section discusses how to:<UL><P><LI><A HREF="hosts.html">Add, get, or remove hosts from the access control list</A><P><LI><A HREF="access.html">Change, enable, or disable access</A></UL><P><!.IN "Access control list"><!.IN "Authentication">X does not provide any protection on a per-window basis.If you find out the resource ID of a resource, you can manipulate it.To provide some minimal level of protection, however,connections are permitted only from machines you trust.This is adequate on single-user workstations but obviouslybreaks down on timesharing machines.Although provisions exist in the X protocol for proper connectionauthentication, the lack of a standard authentication serverleaves host-level access control as the only common mechanism.<P><!.IN "Default Protection">The initial set of hosts allowed to open connections typically consists of:<UL><P><LI>The host the window system is running on.<P><LI>On POSIX-conformant systems, each host listed in the<B>/etc/X?.hosts</B>file.The ? indicates the number of thedisplay.<!.IN "Files" "/etc/X?.hosts">This file should consist of host names separated by newlines.DECnet nodes must terminate in :: to distinguish them from Internet hosts.</UL><P>If a host is not in the access control list when the access control mechanism is enabled and if the host attempts to establish a connection,the server refuses the connection.To change the access list,the client must reside on the same host as the server and/or musthave been granted permission in the initial authorization at connectionsetup.<P>Servers also can implement other access control policies in addition toor in place of this host access facility.For further information about other access control implementations,see ``X Window System Protocol.''<H5 ALIGN=right><I>Next: <A HREF="hosts.html">Adding, Getting, or Removing Hosts</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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