前言

redhat7
FileZilla Client 3.42.1
sshd配置的sftp
sftp登录时，发生异常。

现象

FileZilla Client 异常：Server unexpectedly closed network connection
sshd日志异常

May 31 10:30:47 localhost sshd[23380]: ssh_selinux_copy_context: getcon failed with No such file or directory

selinux异常：

May 31 10:30:47 localhost sshd[23368]: Accepted password for sftpabc from 3.0.1.2 port 60891 ssh2
May 31 10:30:47 localhost sshd[23368]: pam_unix(sshd:session): session opened for user sftpabc by (uid=0)
May 31 10:30:47 localhost sshd[23380]: ssh_selinux_copy_context: getcon failed with No such file or directory
May 31 10:30:47 localhost sshd[23368]: pam_unix(sshd:session): session closed for user sftpabc

分析

sshd服务重启，异常未消除。
关闭selinux，异常未消除。
修改密码，异常未消除。
新建账户，新账户可以sftp登录。
查sftp进程数量，发现异常。该sftp帐户有大量的进程。 getcon failed失败可能与此有关。

ps -ax | grep -v grep | grep sftpone | wc -l
------------------------------------------------
查询结果：6174

查sftp/sshd连接数量，发现异常。sftp/sshd有大量的连接。getcon failed失败可能与此有关。

netstat -n | awk '/^tcp .+sshd.+$/' | wc -l
------------------------------------------------
查询结果：2058

解决办法

关闭该帐户的进程。

# sftpabc 是sftp帐户名
ps -aux|grep sftpabc|grep -v grep|cut -c 9-15|xargs kill -9

参考

查看selinux日志

tail -f /var/log/secure

查看sshd日志

systemctl status sshd -l -n100

查SFTP账户的进程数量

# sftpabc 是sftp帐户名
ps -ax|grep sftpabc

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[linux] sftp/ssh异常：ssh_selinux_copy_context getcon failed with No such file or directory

前言

现象

分析

解决办法

参考

查看selinux日志

查看sshd日志

查SFTP账户的进程数量

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