X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=ssh_config;h=be03a42673df4647a24d8e075112a01054a201bc;hb=3085f6d8af8bd80ae2a7bd8f1e03450855caa78a;hp=9dc5150803fdb0c04ed89778233d7b85d5c4e218;hpb=84d4c17e1e81a81a9ff8194227d41a8031f9a368;p=config%2Fdotfiles.git

diff --git a/ssh_config b/ssh_config
index 9dc5150..be03a42 100644
--- a/ssh_config
+++ b/ssh_config
@@ -1,6 +1,9 @@
 # SSH configuration file.
+#
+# Some options are set even if they are default to prevent /etc/ssh/ssh_config
+# from overwriting them.
 
-# Copyright (C) 2011-2012  Simon Ruderich
+# Copyright (C) 2011-2013  Simon Ruderich
 #
 # This file is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -15,6 +18,13 @@
 # You should have received a copy of the GNU General Public License
 # along with this file.  If not, see <http://www.gnu.org/licenses/>.
 
+# Undocumented (and not very well tested) feature. This drops the connection
+# after 5 seconds of inactivity. Thanks to shad0VV in #openssh on Freenode
+# (2012-11-04 18:40 CET) for telling me about this undocumented feature.
+#
+#     ServerAliveCountMax 0
+#     ServerAliveInterval 5
+
 
 # Rules for all hosts.
 Host *
@@ -29,13 +39,23 @@ Host *
 # to local X11!
     ForwardX11Trusted no
 
-# If -M is used store the control master socket in ~/.ssh. Necessary for
-# ControlMaster to work.
-    ControlPath ~/.ssh/master-%l-%h-%p-%r
-
 # Abort if not all requested port forwardings can be set up.
     ExitOnForwardFailure yes
 
+# Allow using -M (ControlMaster) to create a master SSH session which
+# "tunnels" other connections to the same host, thus reducing the number of
+# authentications (which are relatively slow) and TCP connections. The master
+# sockets are stored in ~/.ssh (by default ControlPath is not set).
+    ControlPath ~/.ssh/master-%l-%h-%p-%r
+
+# Hash hosts in ~/.ssh/known_hosts to try to conceal the known hosts. Doesn't
+# help if the ssh hosts are stored in the shell's history file or in this file
+# as shortcut.
+    HashKnownHosts yes
+
+# Don't permit running local commands.
+    PermitLocalCommand no
+
 # Don't send any environment variables.
     SendEnv