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-*- outline -*-
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* Port forwarding.
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$ ssh -L 8888:www.linuxhorizon.ro:80 user@computer -N
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$ ssh -L 8888:www.linuxhorizon.ro:80 -L 110:mail.linuxhorizon.ro:110 \
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25:mail.linuxhorizon.ro:25 user@computer -N
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The second example (see above) show you how to setup your ssh tunnel for web, pop3
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and smtp. It is useful to recive/send your e-mails when you don't have direct access
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to the mail server.
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For the ASCII art and lynx browser fans here is illustrated the first example:
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+----------+<--port 22-->+----------+<--port 80-->o-----------+
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|SSH Client|-------------|ssh_server|-------------| host |
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+----------+ +----------+ o-----------+
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localhost:8888 computer www.linuxhorizon.ro:80
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* Port listening.
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Connect to a server:
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$ nc hostname port
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Be a server:
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$ nc -l -p port
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* Simple filetransfer.
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Serve a file:
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$ nc -l -p port < file
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Receive a file:
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$ nc hostname port > file
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* Filesystem cloning.
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Serve the filesystem:
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$ tar cOPp --same-owner / | nc -l -p port
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Receive the filesystem:
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$ nc -w3 hostname port | tar xPp
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* Disk cloning.
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Serve the disk image:
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$ dd if=/dev/hda | nc -l -p port
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Receive the image:
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$ nc -w3 hostname port | dd of=/dev/hda
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* Encrypted, compressed and IP restricted filetransfer.
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If combining encryption and compression, be sure to compress first then
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encrypt when sending and reverse the order for receiving. Do not attempt to
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encrypt then compress. Compression works by finding patterns which are
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destroyed intentionally by the process of encryption. Also, though not
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required, specifying the IP address of the host that will be transferring the
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file is a good idea.
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Serving a compresssed, encrypted file from 192.168.0.1 to 192.168.0.2:
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$ gzip -c < file | openssl aes-128-cbc -e -k thispassword | nc -l 192.168.0.2 12345
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Receiving, decrypting and decompressing that file:
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$ nc 192.168.0.1 12345 | openssl aes-128-cbc -d -k thispassword | gunzip -c > file
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* Scan with nmap.
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TODO
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* Scan with netcat.
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$ nc -v -w 2 -z hostname portrange
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$ nc -v -w 2 -z hostname portlisting
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Where portrange is for example "10-20" to scan all ports between 10 and 20,
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portlisting is for example 11,20,135 will scan these ports.
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I just tried this on windows xp, and the comma separated list of ports does
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NOT work. Instead, use space separated list. eg:
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cmd> nc.exe -vv -w 2 -z www.example.com 20-25 79 80 110 137-139 443
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