From: Simon McVittie Date: Thu, 12 Apr 2018 13:07:17 +0000 (+0100) Subject: dbus-daemon(1): Mention and deprecate shared session buses X-Git-Tag: dbus-1.12.8~5 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a03a3700546bc4de95bed721ea8b26bdf569b5e;p=thirdparty%2Fdbus.git dbus-daemon(1): Mention and deprecate shared session buses This might (?) have made sense behind a firewall in 2003; but now it's 2018, the typical threat model that we are defending against has changed from "vandals want to feel proud of their l33t skills" to "organised crime wants your money", and a "trusted" local LAN probably contains an obsolete phone, tablet, games console or Internet-of-Things-enabled toaster with remote root exploits. This make network topologies that used to be acceptable look increasingly irresponsible. Bug: https://bugs.freedesktop.org/show_bug.cgi?id=106004 Signed-off-by: Simon McVittie Reviewed-by: Philip Withnall (cherry picked from commit d0a16b59a8572fbd1934e941e2e3004840306222) --- diff --git a/doc/dbus-daemon.1.xml.in b/doc/dbus-daemon.1.xml.in index 42e3f86f9..960da0808 100644 --- a/doc/dbus-daemon.1.xml.in +++ b/doc/dbus-daemon.1.xml.in @@ -432,6 +432,19 @@ a transport name plus possible parameters/options. + + Remote TCP connections were historically sometimes used to share + a single session bus between login sessions of the same user on + different machines within a trusted local area network, in + conjunction with unencrypted remote X11, a NFS-shared home + directory and NIS (YP) authentication. This is insecure against + an attacker on the same LAN and should be considered strongly + deprecated; more specifically, it is insecure in the same ways + and for the same reasons as unencrypted remote X11 and NFSv2/NFSv3. + The D-Bus maintainers + recommend using a separate session bus per (user, machine) pair, + only accessible from within that machine. + Example: <listen>unix:path=/tmp/foo</listen>