X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=ssh_config;h=6a2d79a29296e6642b86c58967cfd8d6f1ba4ac5;hb=bd7300f75b51e5ee9905d7f03095828b7bb70976;hp=78662eef8a37488500a912139ed69dad9840e6cd;hpb=3e95c7cbbc9e1f75876a0198cd585d91f7409681;p=config%2Fdotfiles.git

diff --git a/ssh_config b/ssh_config
index 78662ee..6a2d79a 100644
--- a/ssh_config
+++ b/ssh_config
@@ -29,29 +29,55 @@
 # Rules for all hosts.
 Host *
 
-# Force protocol version 2 which is more secure.
+# Force protocol version 2 which is more secure (default).
     Protocol 2
 
-# Disable X11 and agent forwarding for security reasons.
+# Disable X11 and agent forwarding for security reasons (defaults).
     ForwardX11 no
     ForwardAgent no
 # Don't trust remote X11 clients. If enabled allows bad admins complete access
 # to local X11!
     ForwardX11Trusted no
 
+# Disable authentication methods I don't use.
+    ChallengeResponseAuthentication no
+    GSSAPIAuthentication no
+    HostbasedAuthentication no
+    KbdInteractiveAuthentication no
+# Only enable those I need.
+    PasswordAuthentication yes
+    PubkeyAuthentication yes
+
+# Bind local forwardings to loopback only. This way no remote hosts can access
+# them (default).
+    GatewayPorts no
+# 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
+# Automatically create a new master session if there's none yet or use an
+# existing one. This way the user doesn't have to use -M to enable a master
+# manually. Don't set this option to "yes" or all SSH commands try to become
+# the master session which is obviously not possible.
+    ControlMaster auto
 
-# Abort if not all requested port forwardings can be set up.
-    ExitOnForwardFailure yes
+# 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 (default).
+    PermitLocalCommand no
 
-# Don't send any environment variables.
+# Don't send any environment variables (default).
     SendEnv
 
-# Check host IP in known_hosts when connecting to detect DNS spoofing.
+# Check host IP in known_hosts when connecting to detect DNS spoofing
+# (default).
     CheckHostIP yes
-# Ask before adding any host keys to ~/.ssh/known_hosts.
+# Ask before adding any host keys to ~/.ssh/known_hosts (default).
     StrictHostKeyChecking ask