[2024-feb-29] Sad news: Eric Layton aka Nocturnal Slacker aka vtel57 passed away on Feb 26th, shortly after hospitalization. He was one of our Wiki's most prominent admins. He will be missed.
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talk:howtos:window_managers:vnc [2023/02/27 22:10 (UTC)] – flesh out into a full how-to for on-demand virtual terminals metaed | talk:howtos:window_managers:vnc [2023/03/13 18:29 (UTC)] (current) – remove body of new section now promoted to article metaed | ||
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====== Starting '' | ====== Starting '' | ||
- | A nice refinement is to configure the remote host to automatically create for each user a permanent virtual terminal. | + | The proposed new section was promoted |
- | + | ||
- | The virtual terminal gets created when the user first connects. The user can detach from their terminal and reattach from elsewhere, providing true persistent terminal service. The terminal persists until either | + | |
- | + | ||
- | (i) the user destroys it by logging out, or | + | |
- | + | ||
- | (ii) the system operator destroys it by rebooting. | + | |
- | + | ||
- | ===== Remote host listener ===== | + | |
- | + | ||
- | The remote host needs an '' | + | |
- | + | ||
- | 5901 stream tcp wait arfon / | + | |
- | 5902 stream tcp wait metaed / | + | |
- | 5903 stream tcp wait doe / | + | |
- | 5904 stream tcp wait roe / | + | |
- | + | ||
- | This arranges that when a VNC viewer connects | + | |
- | + | ||
- | If this is the first time you’ve used '' | + | |
- | + | ||
- | # chmod 755 / | + | |
- | # / | + | |
- | # pgrep -l inetd | + | |
- | 27849 inetd | + | |
- | + | ||
- | ===== Connection procedure ===== | + | |
- | + | ||
- | To use, there is a two step procedure. First, the end user connects using '' | + | |
- | + | ||
- | $ ssh -L 5901: | + | |
- | + | ||
- | Second, the end user connects using '' | + | |
- | + | ||
- | I've seen at least one VNC viewer (bVNC) that has builtin support for '' | + | |
- | + | ||
- | ===== Display manager configuration ===== | + | |
- | + | ||
- | This depends entirely on which display manager you have available, and is really outside the scope of this how-to. Here is just a simple example. Supposing you want to use bog-standard '' | + | |
- | + | ||
- | * Open ''/ | + | |
- | * Edit the line '' | + | |
- | * Disable the line by inserting a '' | + | |
- | * Open ''/ | + | |
- | * Edit the line ''# | + | |
- | * Change the '' | + | |
- | * Enable the line by deleting the ''#'' | + | |
- | + | ||
- | You might not want your '' | + | |
- | + | ||
- | * Open ''/ | + | |
- | * Edit the line '': | + | |
- | * Disable the line by inserting a ''#'' | + | |
- | + | ||
- | You will also need to change the remote host’s default runlevel from '' | + | |
- | + | ||
- | * Open ''/ | + | |
- | * Edit the line '' | + | |
- | * Change '' | + | |
- | * To make the change immediately without rebooting, run '' | + | |
- | + | ||
- | For extra credit, you can customize '' | + | |
- | + | ||
- | After authentication, | + | |
- | + | ||
- | xterm & | + | |
- | twm | + | |
- | + | ||
- | ===== Security considerations ===== | + | |
- | + | ||
- | There are several layers of security available to protect the remote virtual terminals from unauthorized use. | + | |
- | + | ||
- | ==== Firewall ==== | + | |
- | + | ||
- | The first layer of security is the remote host’s firewall. Firewall configuration is outside the scope of this how-to, but here is a brief outline of what you need. The firewall ought to deny remote connections by default. So if you already block all ports by default, no change is needed. You will NOT be punching holes in your firewall to make this work. Supposing your remote host provides only SSH service, and you use the '' | + | |
- | + | ||
- | type filter hook input priority 0; policy drop; | + | |
- | ct state vmap { 0x1 : drop, 0x2 : accept, 0x4 : accept } | + | |
- | iifname " | + | |
- | tcp dport 22 accept | + | |
- | + | ||
- | With such a firewall in place, you are properly secured. | + | |
- | + | ||
- | ==== Authentication ==== | + | |
- | + | ||
- | There are several authentication layers available. | + | |
- | + | ||
- | | + | |
- | - The terminal can be secured using '' | + | |
- | - The '' | + | |
- | - The user can '' | + | |
- | + | ||
- | ===== References ===== | + | |
- | + | ||
- | * '' | + | |
- | * '' | + | |
- | * '' | + | |
- | * '' | + | |
- | * '' | + | |
- | * '' | + |