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Remove sway-security(7)
We will need to overhaul this for 1.0
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Drew DeVault
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vim:set ts=4 sw=4 tw=82 noet:
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sway-security (7)
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=================
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Name
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----
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sway-security - Guidelines for securing your sway install
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Security Overview
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-----------------
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**Sway is NOT secure**. We are working on it but do not trust that we have it all
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figured out yet. The following man page is provisional.
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Securing sway requires careful configuration of your environment, the sort that's
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usually best suited to a distribution maintainer who wants to ship a secure sway
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environment in their distribution. Sway provides a number of means of securing it but
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you must make a few changes external to sway first.
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Configuration of security features is limited to files in the security directory
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(this is likely /etc/sway/security.d/*, but depends on your installation prefix).
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Files in this directory must be owned by root:root and chmod 644 or 444. The default
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security configuration is installed to /etc/sway/security.d/00-defaults, and
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should not be modified - it will be updated with the latest recommended security
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defaults between releases. To override the defaults, you should add more files to
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this directory.
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Environment security
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--------------------
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LD_PRELOAD is a mechanism designed to ruin the security of your system. There are
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a number of strategies for dealing with this, but they all suck a little. In order
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of most practical to least practical:
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1. Only run important programs via exec. Sway's exec command will ensure that
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LD_PRELOAD is unset when running programs.
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2. Remove LD_PRELOAD support from your dynamic loader (requires patching libc).
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This may break programs that rely on LD_PRELOAD for legitimate functionality,
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but this is the most effective solution.
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3. Use static linking for important programs. Of course statically linked programs
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are unaffected by the dynamic linking security dumpster fire.
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Note that should you choose method 1, you MUST ensure that sway itself isn't
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compromised by LD_PRELOAD. It probably isn't, but you can be sure by setting
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/usr/bin/sway to a+s (setuid), which will instruct the dynamic linker not to
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permit LD_PRELOAD for it (and will also run it as root, which sway will shortly
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drop). You could also statically link sway itself.
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Note that LD_LIBRARY_PATH has all of these problems, and the same solutions.
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Read your log
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-------------
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Sway does sanity checks and prints big red warnings to stderr if they fail. Read
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them.
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Feature policies
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----------------
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Certain sway features are security sensitive and may be configured with security
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policies. These features are:
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**background**::
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Permission for a program to become the background.
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**fullscreen**::
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Permission to become fullscreen. Note that users can always make a window
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fullscreen themselves with the fullscreen command.
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**ipc**::
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Permission to connect to sway's IPC socket.
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**keyboard**::
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Permission to receive keyboard events (only while they are focused).
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**lock**::
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Permission for a program to act as a screen locker. This involves becoming
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fullscreen (on all outputs) and receiving _all_ keyboard and mouse input for
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the duration of the process.
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**mouse**::
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Permission to receive mouse events (only while the mouse is over them).
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**panel**::
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Permission for a program to stick its windows to the sides of the screen.
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**screenshot**::
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Permission to take screenshots or record the screen.
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By default, no permissions are granted (though saner defaults are provided in
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/etc/sway/config.d/security). You can use the following configuration options to control
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a program's access:
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**permit** <executable> <features...>::
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Permits <executable> to use <features> (each feature separated by a space).
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<executable> may be * to affect the default policy, or the full path to the
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executable file.
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**reject** <executable> <features...>::
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Disallows <executable> from using <features> (each feature separated by a space).
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<executable> may be * to affect the default policy, or the full path to the
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executable file.
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Note that policy enforcement requires procfs to be mounted at /proc and the sway
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process to be able to access _/proc/[pid]/exe_ (see **procfs(5)** for details on
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this access - setcap cap_sys_ptrace=eip /usr/bin/sway should do the trick). If
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sway is unable to read _/proc/[pid]/exe_, it will apply the default policy.
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To work correctly, sway's own programs require the following permissions:
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- swaybg: background
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- swaylock: lock, keyboard
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- swaybar: panel, mouse, ipc
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- swaygrab: screenshot, ipc
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When you first declare a policy for an executable, it will inherit the default
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policy. Further changes to the default policy will not retroactively affect which
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permissions an earlier policy inherits. You must explicitly reject any features
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from the default policy that you do not want an executable to receive permission
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for.
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Command policies
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----------------
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You can also control the context from which a command may execute. The different
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contexts you can control are:
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**config**::
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Can be run from your config file.
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**binding**::
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Can be run from bindsym or bindcode commands.
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**ipc**::
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Can be run by IPC clients.
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**criteria**::
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Can be run when evaluating window criteria.
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**all**::
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Shorthand for granting permission in all contexts.
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By default a command is allowed to execute in any context. To configure this, open
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a commands block and fill it with policies:
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commands {
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<name> <contexts...>
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...
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}
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For example, you could do this to limit the use of the focus command to just
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binding and criteria:
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commands {
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focus binding criteria
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}
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Setting a command policy overwrites any previous policy that was in place.
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IPC policies
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------------
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Disabling IPC access via swaymsg is encouraged if you intend to secure the IPC
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socket, because any program that can execute swaymsg could circumvent its own
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security policy by simply invoking swaymsg.
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You can configure which features of IPC are available for particular clients:
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ipc <executable> {
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...
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}
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You may use * for <executable> to configure the default policy for all clients.
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Configuring IPC policies for specific executables is not supported on FreeBSD, and
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the default policy will be applied to all IPC connections.
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The following commands are available within this block:
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**bar-config** <enabled|disabled>::
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Controls GET_BAR_CONFIG (required for swaybar to work at all).
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**command** <enabled|disabled>::
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Controls executing sway commands via IPC.
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**inputs** <enabled|disabled>::
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Controls GET_INPUTS (input device information).
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**marks** <enabled|disabled>::
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Controls GET_MARKS.
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**outputs** <enabled|disabled>::
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Controls GET_OUTPUTS.
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**tree** <enabled|disabled>::
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Controls GET_TREE.
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**workspaces** <enabled|disabled>::
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Controls GET_WORKSPACES.
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You can also control which IPC events can be raised with an events block:
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ipc <executable> {
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events {
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...
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}
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}
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The following commands are valid within an IPC events block:
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**binding** <enabled|disabled>::
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Controls keybinding notifications (disabled by default).
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**input** <enabled|disabled>::
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Controls input device hotplugging notifications.
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**mode** <enabled|disabled>::
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Controls output hotplugging notifications.
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**output** <enabled|disabled>::
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Controls output hotplugging notifications.
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**window** <enabled|disabled>::
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Controls window event notifications.
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**workspace** <enabled|disabled>::
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Controls workspace notifications.
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In each of these blocks, you may use * (as in "* enabled" or "* disabled") to
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control access to every feature at once.
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Authors
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-------
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Maintained by Drew DeVault <sir@cmpwn.com>, who is assisted by other open
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source contributors. For more information about sway development, see
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<https://github.com/swaywm/sway>.
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