Various Debian-specific configuration changes

ssh: Enable ForwardX11Trusted, returning to earlier semantics which cause
fewer problems with existing setups (http://bugs.debian.org/237021).

ssh: Set 'SendEnv LANG LC_*' by default (http://bugs.debian.org/264024).

ssh: Enable HashKnownHosts by default to try to limit the spread of ssh
worms.

ssh: Enable GSSAPIAuthentication by default.

sshd: Enable PAM, disable ChallengeResponseAuthentication, and disable
PrintMotd.

sshd: Enable X11Forwarding.

sshd: Set 'AcceptEnv LANG LC_*' by default.

sshd: Change sftp subsystem path to /usr/lib/openssh/sftp-server.

Document all of this.

Author: Russ Allbery <rra@debian.org>
Forwarded: not-needed
Last-Update: 2017-10-04

Patch-Name: debian-config.patch

1 files changed, 18 insertions, 1 deletions

diff --git a/ssh_config.5 b/ssh_config.5
index a91355726..1a8e24bd1 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -71,6 +71,22 @@ Since the first obtained value for each parameter is used, more
 host-specific declarations should be given near the beginning of the
 file, and general defaults at the end.
 .Pp
+Note that the Debian
+.Ic openssh-client
+package sets several options as standard in
+.Pa /etc/ssh/ssh_config
+which are not the default in
+.Xr ssh 1 :
+.Pp
+.Bl -bullet -offset indent -compact
+.It
+.Cm SendEnv No LANG LC_*
+.It
+.Cm HashKnownHosts No yes
+.It
+.Cm GSSAPIAuthentication No yes
+.El
+.Pp
 The file contains keyword-argument pairs, one per line.
 Lines starting with
 .Ql #
@@ -699,11 +715,12 @@ elapsed.
 .It Cm ForwardX11Trusted
 If this option is set to
 .Cm yes ,
+(the Debian-specific default),
 remote X11 clients will have full access to the original X11 display.
 .Pp
 If this option is set to
 .Cm no
-(the default),
+(the upstream default),
 remote X11 clients will be considered untrusted and prevented
 from stealing or tampering with data belonging to trusted X11
 clients.