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.TH vncpasswd 1 "" "KasmVNC" "Virtual Network Computing"
.SH NAME
vncpasswd \- change the VNC password
vncpasswd \- setup VNC users and passwords
.SH SYNOPSIS
\fB vncpasswd\fR [\fI passwd-file\fR ]
.br
\fB vncpasswd\fR \- f
\fB vncpasswd\fR -u [\fI username\fR ] [\fI -wnod\fR ] [\fI passwd-file\fR ]
.SH DESCRIPTION
.B vncpasswd
allows you to set the password used to access VNC desktops. Its default
behavior is to prompt for a VNC password and then store an obfuscated version
of this password to \fI passwd-file\fR (or to $HOME/.vnc/passwd if no password
file is specified.) The \fB vncserver\fP script runs \fB vncpasswd\fP the first
time you start a VNC desktop, and it invokes \fB Xvnc\fP with the appropriate
\fB \- rfbauth\fP option. \fB vncviewer\fP can also be given a password file to
use via the \fB \- passwd\fP option.
The password must be at least six characters long (unless the \fB \- f\fR
command-line option is used-- see below), and only the first eight
characters are significant. Note that the stored password is \fB not\fP
encrypted securely - anyone who has access to this file can trivially find out
the plain-text password, so \fB vncpasswd\fP always sets appropriate 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.
allows you to add users and passwords used to access VNC desktops. Multiple
users can be added, each with its own permissions. You can set view-only, use of
mouse and keyboard allowed (-w), user managment permissions (-o). See OPTIONS
below for details.
Its default behavior is to prompt for a VNC password and then store an
obfuscated version of this password to \fI passwd-file\fR (or to
$HOME/.kasmpasswd if no password file is specified.) The \fB vncserver\fP script
will ask you to add a user the first time you start a VNC desktop. HTTP Basic
Authentication will be used to ask for username and password, when you connect.
The password must be at least six characters long (maximum of 128 characters).
Note that the stored password is \fB not\fP encrypted securely - anyone who has
access to this file can trivially find out the plain-text password, so
\fB vncpasswd\fP always sets appropriate 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.
.SH OPTIONS
.TP
.B \- f
Filter mode. Read a plain-text password from stdin and write an encrypted
version to stdout. Note that in filter mode, short or even empty passwords
will be silently accepted.
.B \- u \fI name\fR
Specify user name. There can be multiple users.
.TP
.B \- w
Write permission. Enable user to use mouse and keyboard. The default mode is to
view only.
.TP
.B \- o
A view-only password must be separated from the normal password by a newline
character.
Owner permission. Allow the user to add/delete users and change their
permissions.
.TP
.B \- d
Delete user specified with \fI -u\fR . You need the owner permission for that.
.TP
.B \- n
Don't update their password, while updating permissions.
.SH FILES
.TP
$HOME/.vnc/passwd
$HOME/.kasm passwd
Default location of the VNC password file.
.SH EXAMPLES
.TP
Create a new user foo that can to use mouse and keyboard:
$ vncpasswd -u foo -w
.TP
Create a new user foo that can view, but can't use mouse and keyboard:
$ vncpasswd -u foo
.TP
Create a new user foo that can add new users AND use mouse and keyboard:
$ vncpasswd -u foo -ow
.TP
Delete user foo
$ vncpasswd -u foo -d
.TP
Strip all permissions from user foo, making it view only. Don't touch password.
$ vncpasswd -u foo -n
.TP
Strip all permissions from user foo, making it view only. Change password.
$ vncpasswd -u foo
.TP
Add write permission for user foo. Don't touch password.
$ vncpasswd -u foo -w -n
.SH SEE ALSO
.BR vncviewer (1),
.BR vncserver (1),
.BR Xvnc (1)
.BR vncconfig (1),