javaSftpserver

Native cross-platform ssh/sftp server compiled with graalvm, only 6m in size.(If it works for you, please give me a star >_<)

use

Use commands to execute files on the machine to be managed.

args: user passMd5 host port

iptables -A INPUT -p tcp --dport   36721 -j ACCEPT #If your machine is linux, you need to open the port for connection
./javaSftp-1.0-SNAPSHOT_UPX  test e10adc3949ba59abbe56e057f20f883e 122.114.xxx.xxx  36721  #user=test pass=123456 (e10adc3949ba59abbe56e057f20f883e)

Then you can connect in the file manager under linux/windows

• linux nautilus

• windows: You need some software such as WinSCP

issue

• Unable to connect to sftp server You can execute ssh user@host -p port first to try to connect to the target ssh service，If your sftp server was restarted before , a new key will be generated in the client's ~/.ssh directory.Try to delete the key information in the known_hosts file,Reconnect afterwards

xxx@xxxx~> ssh test@122.114.xxx.xxx -p 36721                                                                                                                                                                    14:17:09
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:mwYLNeXGp6svf9pJ8z98QWzghWbBE4rm0Sfhcs1QdpE.
Please contact your system administrator.
Add correct host key in /home/xxx/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /home/xxx/.ssh/known_hosts:1
  remove with:
  ssh-keygen -f "/home/xxx/.ssh/known_hosts" -R "[122.114.xxx.xxx]:36721"
ECDSA host key for [122.114.xxx.xxx]:36721 has changed and you have requested strict checking.
Host key verification failed.

build

git cone this project , and open with IDE .After waiting for maven to compile the classes that can be compiled.

jar

Because there are some symbol errors that require other dependencies, they will increase the size of the binary executable file. So I chose not to fix them (does not affect basic functions)

cd  javaSftpserver
 mvn assembly:attached -f "pom.xml"  #They will output all class files to the target folder

Will generate a jar in directory target

native image

linux

cd  javaSftpserver
./build.sh

In order to successfully perform native compilation, I dealt with the log dependency of Apache SSHD's SLFJ. Pre-compilation configuration and optimization have been carried out.You can execute build.sh to compile after installing graalvm.When I perform upx compression, the output file size is reduced to 6m.

windows

In theory, it supports windows, you need to download the windows version of graalvm and install navtive-image. And replace the navtive-image path in build.sh, enter in the console

[your mvn path] assembly:attached -f "pom.xml"
[your native-image path]    --no-fallback   -H:+ReportExceptionStackTraces  --no-server   --initialize-at-build-time   --allow-incomplete-classpath     -H:DynamicProxyConfigurationFiles=proxyClass.json --enable-all-security-services   -H:ReflectionConfigurationFiles=reflectionConfig.json      --pgo    -jar target/javaSftp-1.0-SNAPSHOT.jar

中文

这是一个java实现的跨平台的ssh/sftp服务器,使用graalvm原生编译为二进制镜像,只有6m.我一般用来管理docker文件和远程vps文件。已经在linux ubuntu18 x64上进行了编译和测试(支持文件/夹 删除/创建/修改/复制/移动 等).如果它对你有用,请给我一个星星>_<

为了成功的进行原生编译,我处理了Apache SSHD的SLFJ的日志依赖。已经进行了提前的编译配置和PGO优化,你可以在安装graalvm后执行build.sh进行编译,当我进行了upx压缩之后,输出文件体积降低到了6m.关于如何编译,见英文上文.