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vncpasswd(1) [debian man page]

vncpasswd(1)                                                         TightVNC                                                         vncpasswd(1)

vncpasswd - set passwords for VNC server SYNOPSIS
vncpasswd [file] vncpasswd -t vncpasswd -f DESCRIPTION
The vncpasswd utility should be used to create and change passwords for the TightVNC server authentication. Xvnc uses such passwords when started with the -rfbauth command-line option (or when started from the vncserver script). vncpasswd allows to enter either one or two passwords. The first password is the primary one, the second password can be used for view-only authentication. Xvnc will restrict mouse and keyboard input from clients who authenticated with the view-only password. The vncpasswd util- ity asks interactively if it should set the second password. The password file name defaults to $HOME/.vnc/passwd unless the -t command-line option was used (see the OPTIONS section below). The $HOME/.vnc/ directory will be created if it does not exist. Each password has to be longer than five characters (unless the -f command-line option was used, see its description below). Only the first eight characters are significant. If the primary password is too short, the program will abort. If the view-only password is too short, then only the primary password will be saved. Unless a file name was provided in the command-line explicitly, this utility may perform certain sanity checks to prevent writing a pass- word file into some hazardous place. If at least one password was saved successfully, vncpasswd will exit with status code 0. Otherwise the returned status code will be set to 1. OPTIONS
-t Write passwords into /tmp/$USER-vnc/passwd, creating the /tmp/$USER-vnc/ directory if it does not exist, and checking the permis- sions on that directory (the mode must be 700). This option can help to improve security when your home partition may be shared via network (e.g. when using NFS). -f Filter mode. Read plain-text passwords from stdin, write encrypted versions to stdout. One or two passwords (full-control and view- only) can be supplied in the input stream, newline terminates a password. Note that in the filter mode, short or even empty pass- words will be silently accepted. SEE ALSO
vncserver(1), Xvnc(1), vncviewer(1), vncconnect(1) AUTHORS
Original VNC was developed in AT&T Laboratories Cambridge. TightVNC additions were implemented by Constantin Kaplinsky. Many other people participated in development, testing and support. Man page authors: Marcus Brinkmann <>, Tim Waugh <>, Constantin Kaplinsky <> August 2006 vncpasswd(1)

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vncpasswd(1)						     Virtual Network Computing						      vncpasswd(1)

vncpasswd - change a VNC password SYNOPSIS
vncpasswd [passwd-file] DESCRIPTION
vncpasswd allows you to set the password used to access VNC desktops. It stores an obfuscated version of the password in the given file (default $HOME/.vnc/passwd). The vncserver script runs vncpasswd the first time you start a VNC desktop, and invokes Xvnc with the appro- priate -rfbauth option. vncviewer can also be given a password file to use via the -passwd option. The password must be at least six characters long, and only the first eight characters are significant. Note that the stored password is not encrypted securely - anyone who has access to this file can trivially find out the plaintext password, so vncpasswd always sets appro- priate permissions (read and write only by the owner). However, when accessing a VNC desktop a challenge-response mechanism is used over the wire making it hard for anyone to crack the password simply by snooping on the network. FILES
$HOME/.vnc/passwd Default location of the VNC password file. SEE ALSO
vncviewer(1), vncserver(1), Xvnc(1) vncconfig(1), AUTHOR
Tristan Richardson, RealVNC Ltd. VNC was originally developed by the RealVNC team while at Olivetti Research Ltd / AT&T Laboratories Cambridge. It is now being maintained by RealVNC Ltd. See for details. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability | | +-----------------------------+-----------------------------+ |Interface Stability | | +-----------------------------+-----------------------------+ RealVNC Ltd 03 Mar 2005 vncpasswd(1)

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