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JSch Java Secure Channel by firstname.lastname@example.org, JCraft,Inc. http://www.jcraft.com/jsch/ Last modified: Tue Feb 11 14:11:51 UTC 2003 Description =========== JSch is a pure Java implementation of SSH2. JSch allows you to connect to an sshd server and use port forwarding, X11 forwarding, file transfer, etc., and you can integrate its functionality into your own Java programs. JSch is licensed under BSD style license. Documentation ============= * README files all over the source tree have info related to the stuff in the directories. * ChangeLog: what changed from the previous version? Directories & Files in the Source Tree ====================================== * src/com/ has source trees of JSch * example/ has some samples, which demonstrate the usages. * tools/ has scripts for Ant. Why JSch? ========== Our intension in developing this stuff is to enable users of our pure java X servers, WiredX(http://wiredx.net/) and WeirdX, to enjoy secure X sessions. Our efforts have mostly targeted the SSH2 protocol in relation to X Window System and X11 forwarding. Of course, we are also interested in adding other functionality - port forward, file transfer, terminal emulation, etc. Features ======== * JSch requires J2SE 1.4. JSch is in pure Java, but it depends on JavaTM Cryptography Extension (JCE), which is included in J2SE 1.4.0 or later. * SSH2 protocol support. * Key exchange: diffie-hellman-group-exchange-sha1, diffie-hellman-group1-sha1 * Cipher: blowfish-cbc,3des-cbc * MAC: hmac-md5,hmac-md5-96,hmac-sha1,hmac-sha1-96 * Host key type: ssh-dss, ssh-rsa * Userauth: password * Userauth: publickey(DSA,RSA) * X11 forwarding. * xauth spoofing. * connection through HTTP proxy. * connection through SOCKS5 proxy. * port forwarding. * stream forwarding. * signal sending. The unofficial patch for sshd of openssh will be find in the thread http://marc.theaimsgroup.com/?l=openssh-unix-dev&m=104295745607575&w=2 * remote exec. * SSH File Transfer Protocol * packet compression. JZlib(http://www.jcraft.com/jzlib/) has been used. * JSch is licensed under BSD style license(refer to LICENSE.txt). How To Try ========== This archive does not include java byte code, so please compile the source code by your self. $ cd jsch-?.?.?/src $ javac com/jcraft/jsch/*java com/jcraft/jsch/jce/*java com/jcraft/jzlib/*.java '/examples/' directory has included some samples to demonstrate what JSch can do. Please refer to '/examples/README' file. Stream Forwarding ================= JSch has a unique functionality, Stream Forwarding. Stream Forwarding allows you to plug Java I/O streams directly into a remote TCP port without assigning and opening a local TCP port. In port forwarding, as with the -L option of ssh command, you have to assign and open a local TCP port and that port is also accessible by crackers on localhost. In some case, that local TCP port may be plugged to a secret port via SSH session. A sample program, /example/StreamForwarding.java , demonstrates this functionality. Packet Compression ================== According to the draft from IETF sesch working group, the packet compression can be applied to each data stream directions; from sshd server to ssh client and from ssh client to sshd server. So, jsch allows you to choose which data stream direction will be compressed or not. For example, in X11 forwarding session, the packet compression for data stream from sshd to ssh client will save the network traffic, but usually the traffic from ssh client to sshd is light, so by omitting the compression for this direction, you may be able to save some CPU time. Please refer to a sample program 'examples/Compression.java'. TODO ==== * generating RSA, DSA key pairs. * re-implementation with java.nio. * replacing cipher, hash by JCE with pure Java code. * error handling. Copyrights & Disclaimers ======================== JSch is copyrighted by ymnk, JCraft,Inc. and is licensed through BSD style license. Read the LICENSE.txt file for the complete license. Credits and Acknowledgments ============================ JSch has been developed by email@example.com and it can not be hacked without several help. * First of all, we want to thank JCE team</a> at Sun Microsystems. For long time, we had planed to implement SSH2 in pure Java, but we had hesitated to do because tons of work must be done for implementing ciphers, hashes, etc., from the scratch. Thanks to newly added functionalities to J2SE 1.4.0, we could release the first working version within just 1.5 weeks from the scratch. * We appreciate the OpenSSH project. The options '-ddd' of sshd, '---vvv' of ssh and the compile options '-DPACKET_DEBUG', '-DDEBUG_KEXDH' and '-DDEBUG_KEX' were very useful in debugging JSch. * We appreciate IETF sesch working group and SSH Communications Security Corp. Without the standardization of the protocol, we could not get the chance to implement JSch. * We appreciate Seigo Haruyama(http://www.unixuser.org/~haruyama/), who are interpreting drafts of SSH2 protocol in Japanese. His works were very useful for us to understand the technical terms in our native language. * We also appreciate SourceForge.net's awesome service to the Open Source Community. If you have any comments, suggestions and questions, write us at firstname.lastname@example.org ``SSH is a registered trademark and Secure Shell is a trademark of SSH Communications Security Corp (www.ssh.com)''.