将密钥与 JGit 结合使用以安全地访问 Git 存储库

2022-09-03 05:47:25

我正在使用JGit访问远程Git存储库,我需要使用SSH。JGit 使用 JSch 提供安全访问。但是,我不确定如何为JGit设置密钥文件和知道的主机文件。我尝试的如下。

创建了 SshSessionFactory 的自定义配置,通过子类化 JSchConfigSessionFactory

public class CustomJschConfigSessionFactory extends JschConfigSessionFactory {
    @Override
    protected void configure(OpenSshConfig.Host host, Session session) {
        session.setConfig("StrictHostKeyChecking", "yes");
    }
}

在我访问远程 Git 存储库的类中,执行以下操作:

CustomJschConfigSessionFactory jschConfigSessionFactory = new CustomJschConfigSessionFactory();

JSch jsch = new JSch();
try {
    jsch.addIdentity(".ssh/id_rsa");
    jsch.setKnownHosts(".ssh/known_hosts");
} catch (JSchException e) {
    e.printStackTrace();  
}
    SshSessionFactory.setInstance(jschConfigSessionFactory);

我无法弄清楚如何将此 JSch 对象与 JGit 关联,以便它可以成功连接到远程存储库。当我尝试使用JGit克隆它时,我得到以下异常:

org.eclipse.jgit.api.errors.TransportException: git@git.test.com:abc.org/test_repo.git: reject HostKey: git.test.com
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:137)
at org.eclipse.jgit.api.CloneCommand.fetch(CloneCommand.java:178)
at org.eclipse.jgit.api.CloneCommand.call(CloneCommand.java:125)
at GitTest.cloneRepo(GitTest.java:109)
at GitTest.main(GitTest.java:223)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.eclipse.jgit.errors.TransportException: git@git.test.com:abc.org/test_repo.git: reject HostKey: git.test.com
at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:142)
at org.eclipse.jgit.transport.SshTransport.getSession(SshTransport.java:121)
at org.eclipse.jgit.transport.TransportGitSsh$SshFetchConnection.<init>(TransportGitSsh.java:248)
at org.eclipse.jgit.transport.TransportGitSsh.openFetch(TransportGitSsh.java:147)
at org.eclipse.jgit.transport.FetchProcess.executeImp(FetchProcess.java:136)
at org.eclipse.jgit.transport.FetchProcess.execute(FetchProcess.java:122)
at org.eclipse.jgit.transport.Transport.fetch(Transport.java:1104)
at org.eclipse.jgit.api.FetchCommand.call(FetchCommand.java:128)
... 9 more
Caused by: com.jcraft.jsch.JSchException: reject HostKey: git.test.com
at com.jcraft.jsch.Session.checkHost(Session.java:748)
at com.jcraft.jsch.Session.connect(Session.java:321)
at org.eclipse.jgit.transport.JschConfigSessionFactory.getSession(JschConfigSessionFactory.java:116)
... 16 more

我已将 git.test.com 条目添加到我的文件中。我使用相同的代码访问具有http url的git存储库,因此代码工作正常。这是失败的关键处理部分。关于如何处理这个问题的任何想法?/etc/hosts


答案 1

您需要重写自定义工厂类中的方法:getJSch

class CustomConfigSessionFactory extends JschConfigSessionFactory
{
    @Override
    protected JSch getJSch(final OpenSshConfig.Host hc, FS fs) throws JSchException {
        JSch jsch = super.getJSch(hc, fs);
        jsch.removeAllIdentity();
        jsch.addIdentity( "/path/to/private/key" );
        return jsch;
    }
}

呼叫很重要;没有它似乎不起作用。jsch.removeAllIdentity

需要注意的是:我在Scala中写了上面的内容,然后将其翻译成Java,因此它可能不太正确。原始的 Scala 如下:

class CustomConfigSessionFactory extends JschConfigSessionFactory
{
    override protected def getJSch( hc : OpenSshConfig.Host, fs : FS ) : JSch =
    {
        val jsch = super.getJSch(hc, fs)
        jsch.removeAllIdentity()
        jsch.addIdentity( "/path/to/private/key" )
        jsch
    }
}

答案 2

Jsch sesems不喜欢散列格式的known_hosts文件 - 它必须符合以下格式生成的格式:

ssh-keyscan -t rsa hostname >> ~/.ssh/known_hosts

例如:

<hostname> ssh-rsa <longstring/longstring>

不:

 |1|<hashed hostname>= ecdsa-sha2-nistp256 <hashed fingerprint>=

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