extend openssl tip

[grml-tips.git] / grml_tips

diff --git a/grml_tips b/grml_tips
index 225862e..66f46a5 100644 (file)
--- a/grml_tips
+++ b/grml_tips
@@ -2651,7 +2651,8 @@ See: man grml-terminalserver + http://grml.org/terminalserver/
 -- 
 Debugging SSL communications:
 
-% openssl s_client -connect server.adress:993
+% openssl s_client -connect server.adress:993 > output_file
+% openssl x509 -noout -text -in output_file
 
 or
 
@@ -2930,3 +2931,74 @@ Memtest / memcheck:
 Just boot your grml Live-CD with "memtest" to execute a memcheck/memtest
 with Memtest86+.
 -- 
+Tunnel TCP-Traffic through DNS using dns2tcp:
+
+Server-side:
+~~~~~~~~~~~~
+1. Create necessary DNS-Records:
+dnstun.example.com.     3600    IN      NS      host.example.com.
+dnstun.example.com.     3600    IN      A       192.168.1.1
+host.example.com.       3600    IN      A       192.168.1.1
+
+2. Configure dns2tcpd on host.example.com.:
+# cat /etc/dns2tcpd.conf 
+listen = 192.168.1.1          #the ip dns2tcpd should listen on
+port = 53                     #" port " " " "
+user = nobody
+chroot = /tmp
+domain = dnstun.example.com.  # the zone as specified inside dns
+ressources = ssh:127.0.0.1:22 # available resources
+
+3. Start the daemon:
+# cat > /etc/default/dns2tcp << EOF
+# Set ENABLED to 1 if you want the init script to start dns2tcpd.
+ENABLED=1
+USER=nobody
+EOF
+# /etc/init.d/dns2tcp start
+
+Client-side:
+~~~~~~~~~~~~
+You have two possibilities:
+- Use the DNS inside your network (DNS must allow resolving for external domains)
+# grep nameserver /etc/resolv.conf 
+nameserver 172.16.42.1
+# dns2tcpc -z dnstun.example.com 172.16.42.1
+Available connection(s) : 
+        ssh
+# dns2tcpc -r ssh -l 2222 -z dnstun.example.com 172.16.42.1 &
+Listening on port : 2222
+# ssh localhost -p 2222
+user@host.example.com:~#
+
+- Directly contact the endpoint (port 53 UDP must be allowed outgoing)
+# dns2tcpc -z dnstun.example.com dnstun.example.com
+Available connection(s) : 
+        ssh
+# dns2tcpc -r ssh -l 2222 -z dnstun.example.com dnstun.example.com &
+Listenning on port : 2222
+# ssh localhost -p 2222
+user@host.example.com:~#
+
+Notice: using 'ssh -D 8080 ..' you will get a socks5-proxy listening on
+localhost:8080 which you can use to tunnel everything through your "dns-uplink".
+-- 
+Configure a MadWifi device for adhoc mode:
+
+Disable the autocreation of athX devices:
+# echo "options ath_pci autocreate=none" > /etc/modprobe.d/madwifi
+
+Remove the autocreated device for now:
+# wlanconfig ath0 destroy
+
+Configuration in /etc/network/interfaces:
+
+iface ath0 inet static
+  madwifi-base wifi0
+  madwifi-mode adhoc
+  ...
+
+Hints:
+  - Do not use interface names without ending 0 (otherwise startup fails).
+  - Only chooss unique names for interfaces.
+--