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Russ Magee
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65
README.md
65
README.md
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@ -1,7 +1,7 @@
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[](https://godoc.org/blitter.com/go/hkexsh)
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HKExSh
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# HKExSh
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--
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HKExSh (**H**erradura**K**yber**Ex** **Sh**ell) is a golang implementation of a simple
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@ -19,6 +19,7 @@ and the net.Conn type), which automatically negotiate keying material for
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secure sockets using one of a selectable set of experimental key exchange (KEX) or
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key encapsulation mechanisms (KEM).
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### Key Exchange
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Currently supported exchanges are:
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* The HerraduraKEx key exchange algorithm first released at
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@ -40,16 +41,20 @@ Currently supported session algorithms:
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* HMAC-SHA512
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### Conn
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Calls to hkexnet.Dial() and hkexnet.Listen()/Accept() are generally the same as calls to the equivalents within the _net_ package; however upon connection a key exchange automatically occurs whereby client and server independently derive the same keying material, and all following traffic is secured by a symmetric encryption algorithm.
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Above the hkexnet.Conn layer, the server and client apps in this repository (hkexshd/ and hkexsh/ respectively) negotiate session settings (cipher/hmac algorithms, interactive/non-interactive, tunnels, if any, etc.) to be used for communication.
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### Session Negotiation
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Above the hkexnet.Conn layer, the server and client apps in this repository (hkexshd/ and hkexsh/ respectively) negotiate session settings (cipher/hmac algorithms, interactive/non-interactive mode, tunnel specifiers, etc.) to be used for communication.
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Packets are subject to random padding (size, prefix/postfix), and (optionally) the client and server
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channels can both send _chaff_ packets at random defineable intervals to help thwart analysis of session activity (applicable to interactive and non-interactive command sessions, file copies and tunnels).
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### Padding and Chaffing
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Packets are subject to padding (random size, randomly applied as prefix or postfix), and optionally the client and server channels can both send _chaff_ packets at random defineable intervals to help thwart analysis of session activity (applicable to interactive and non-interactive command sessions, file copies and tunnels).
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Tunnels, if specified, are set up during initial client->server connection. Packets from the client local port(s) are sent through the main secured connection to the server's remote port(s), and vice versa, tagged with a tunnel specifier so that they can be de-multiplexed and delivered to the proper tunnel endpoints.
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### Mux/Demux of Chaffing and Tunnel Data
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Chaffing and tunnels, if specified, are set up during initial client->server connection. Packets from the client local port(s) are sent through the main secured connection to the server's remote port(s), and vice versa, tagged with a chaff or tunnel specifier so that they can be discarded as chaff or de-multiplexed and delivered to the proper tunnel endpoints, respectively.
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Finally, within the hkexpasswd/ directory is a password-setting utility. HKExSh uses its own passwd file distinct from the system /etc/passwd to authenticate clients, using standard bcrypt+salt storage.
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### Accounts and Passwords
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Within the hkexpasswd/ directory is a password-setting utility. HKExSh uses its own password file distinct from the system /etc/passwd to authenticate clients, using standard bcrypt+salt storage. This is currently done to allow alternate login credentials via hkexsh vs. console/ssh login, due to the experimental nature of the program. At some point in the future an option to use the system's /etc/passwd and /etc/shadow may be implemented, making the use of the auxilliary hkexpasswd utility optional or obsolete.
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HERRADURA KEX
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@ -65,51 +70,51 @@ KYBER IND-CCA-2 KEM
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As of this time (Oct 2018) Kyber is one of the candidate algorithms submitted to the [NIST post-quantum cryptography project](https://csrc.nist.gov/Projects/Post-Quantum-Cryptography). The authors recommend using it in "... so-called hybrid mode in combination with established "pre-quantum" security; for example in combination with elliptic-curve Diffie-Hellman." THIS PROJECT DOES NOT DO THIS (in case you didn't notice yet, THIS PROJECT IS EXPERIMENTAL.)
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Dependencies:
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--
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* Recent version of go (tested, at various times, with go-1.9 to go-1.11.1)
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### Dependencies:
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* Recent version of go (tested, at various times, with go-1.9 to go-1.12.4)
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* [github.com/mattn/go-isatty](http://github.com/mattn/go-isatty) //terminal tty detection
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* [github.com/kr/pty](http://github.com/kr/pty) //unix pty control (server pty connections)
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* [github.com/jameskeane/bcrypt](http://github.com/jameskeane/bcrypt) //password storage/auth
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* [blitter.com/go/goutmp](https://gogs.blitter.com/RLabs/goutmp) // wtmp/lastlog C bindings
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* [blitter.com/go/goutmp](https://gogs.blitter.com/RLabs/goutmp) // wtmp/lastlog C bindings for user accounting
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* [https://git.schwanenlied.me/yawning/kyber](https://git.schwanenlied.me/yawning/kyber) // golang Kyber KEM
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* [https://git.schwanenlied.me/yawning/newhope](https://git.schwanenlied.me/yawning/newhope) // golang NEWHOPE,NEWHOPE-SIMPLE KEX
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* [blitter.com/go/mtwist](https://gogs.blitter.com/RLabs/mtwist) // 64-bit Mersenne Twister PRNG
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* [blitter.com/go/cryptmt](https://gogs.blitter.com/RLabs/cryptmt) // CryptMTv1 stream cipher
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Get source code
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--
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### Get source code
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* $ go get -u blitter.com/go/hkexsh
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* $ cd $GOPATH/src/blitter.com/go/hkexsh
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* $ go build ./... # install all dependent go pkgs
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To build
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--
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### To build
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* $ cd $GOPATH/src/blitter.com/go/hkexsh
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* $ make clean all
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To install, uninstall, re-install
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--
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### To install, uninstall, re-install
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* $ sudo make [install | uninstall | reinstall]
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To manage service (assuming openrc init)
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--
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### To manage service (assuming openrc init)
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* $ sudo rc-config [start | restart | stop] hkexshd
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An example init script (hkexshd.initrc) is provided. Consult your Linux distribution documentation for proper service/daemon installation. Default assumes installation in /usr/local/sbin (hkexshd, hkexpasswd) and /usr/local/bin (hkexsh/hkexcp symlink).
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To set accounts & passwords:
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--
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### To set accounts & passwords:
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* $ sudo touch /etc/hkexsh.passwd
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* $ sudo hkexpasswd/hkexpasswd -u joebloggs
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* $ <enter a password, enter again to confirm>
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Testing Client and Server from $GOPATH dev tree (w/o 'make install')
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--
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### Testing Client and Server from $GOPATH dev tree (w/o 'make install')
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In separate shells A and B:
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* [A]$ cd hkexshd && sudo ./hkexshd & # add -d for debugging
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@ -126,15 +131,15 @@ NOTE if running client (hkexsh) with -d, one will likely need to run 'reset' aft
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to fix up the shell tty afterwards, as stty echo may not be restored if client crashes
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or is interrupted.
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Setting up an 'authtoken' for scripted (password-free) logins
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--
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### Setting up an 'authtoken' for scripted (password-free) logins
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Use the -g option of hkexsh to request a token from the remote server, which will return a
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hostname:token string. Place this string into $HOME/.hkexsh_id to allow logins without
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entering a password (obviously, $HOME/.hkexsh_id on both server and client for the user
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should *not* be world-readable.)
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File Copying using hkexcp
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--
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### File Copying using hkexcp
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hkexcp is a symlink to hkexsh, and the binary checks its own filename to determine whether
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it is being invoked in 'shell' or 'copy' mode. Refer to the '-h' output for differences in
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accepted options.
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Remote (server) to local (client) copy:
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* hkexcp joebloggs@host-or-ip:/remoteDirOrFile /some/where/local/Dir
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hkexcp uses a 'tarpipe' to send file data over the encrypted channel. Use the -d flag on client or server to see the generated tar commands if you're curious.
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NOTE: Renaming while copying (eg., 'cp /foo/bar/fileA ./fileB') is NOT supported. Put another way, the destination (whether local or remote) must ALWAYS be a directory.
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hkexcp uses tar (a 'tarpipe') with gzip compression, sending tar data over the hkex encrypted channel. Use the -d flag on client or server to see the generated tar commands if you're curious.
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### Tunnels
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Tunnels
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--
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Simple tunnels (client -> server, no reverse tunnels for now) are supported.
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Syntax: hkexsh -T=<tunspec>{,<tunspec>...}
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.. where <tunspec> is <localport:remoteport>
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Example, tunnelling ssh through hkexsh (NOTE [issue #15](https://blitter.com:3000/RLabs/hkexsh/issues/15))
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Example, tunnelling ssh through hkexsh
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* [server side] $ sudo /usr/sbin/sshd -p 7002
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* [client side, term A] $ hkexsh -T=6002:7002 user@server
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