Debian 10 Buster 中的 Ssh 服务器出现错误

Debian 10 Buster 中的 Ssh 服务器出现错误

无法sshd在 Debian 10“Buster”中连接,连接时出现如下错误:

$ ssh -p 2222 [email protected]
ssh_exchange_identification: read: Connection reset by peer

检查这些服务,出现以下错误:

● sshd.service - OpenBSD Secure Shell server
   Loaded: loaded (/etc/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-10-22 18:10:51 -03; 13min ago
  Process: 559 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
 Main PID: 606 (sshd)
    Tasks: 1 (limit: 2304)
   Memory: 2.3M
   CGroup: /system.slice/sshd.service
           └─606 /usr/sbin/sshd -D

Oct 22 18:10:50 ffurtpc systemd[1]: Starting OpenBSD Secure Shell server...
Oct 22 18:10:51 ffurtpc sshd[606]: Server listening on 0.0.0.0 port 22.
Oct 22 18:10:51 ffurtpc sshd[606]: error: Bind to port 22 on :: failed: Address already in use.
Oct 22 18:10:51 ffurtpc systemd[1]: Started OpenBSD Secure Shell server.
Oct 22 18:14:26 ffurtpc sshd[1514]: Connection closed by authenticating user friedrich 192.168.12.73 port 49880 [preauth]
Oct 22 18:23:45 ffurtpc sshd[1583]: fatal: Missing privilege separation directory: /run/sshd

已经尝试使用xinetd包来管理它,将其设置为端口 2222,而 OpenBSD Secure Shell 服务器保持监听端口 22,如下所示:

● xinetd.service - LSB: Starts or stops the xinetd daemon.
   Loaded: loaded (/etc/init.d/xinetd; generated)
   Active: active (running) since Tue 2019-10-22 18:10:55 -03; 15min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 722 ExecStart=/etc/init.d/xinetd start (code=exited, status=0/SUCCESS)
    Tasks: 1 (limit: 2304)
   Memory: 4.5M
   CGroup: /system.slice/xinetd.service
           └─755 /usr/sbin/xinetd -pidfile /run/xinetd.pid -stayalive -inetd_compat -inetd_ipv6

Oct 22 18:10:56 ffurtpc xinetd[755]: Reading included configuration file: /etc/xinetd.d/echo-udp [file=/etc/xinetd.d/echo-udp] [line=26]
Oct 22 18:10:56 ffurtpc xinetd[755]: Reading included configuration file: /etc/xinetd.d/servers [file=/etc/xinetd.d/servers] [line=14]
Oct 22 18:10:56 ffurtpc xinetd[755]: Reading included configuration file: /etc/xinetd.d/services [file=/etc/xinetd.d/services] [line=13]
Oct 22 18:10:56 ffurtpc xinetd[755]: Reading included configuration file: /etc/xinetd.d/sshd [file=/etc/xinetd.d/sshd] [line=13]
Oct 22 18:10:56 ffurtpc xinetd[755]: Reading included configuration file: /etc/xinetd.d/time [file=/etc/xinetd.d/time] [line=16]
Oct 22 18:10:56 ffurtpc xinetd[755]: Reading included configuration file: /etc/xinetd.d/time-udp [file=/etc/xinetd.d/time-udp] [line=28]
Oct 22 18:10:56 ffurtpc xinetd[755]: 2.3.15.3 started with libwrap loadavg labeled-networking options compiled in.
Oct 22 18:10:56 ffurtpc xinetd[755]: Started working: 1 available service
Oct 22 18:14:22 ffurtpc sshd[1512]: Connection closed by authenticating user friedrich 192.168.12.73 port 35954 [preauth]
Oct 22 18:23:43 ffurtpc sshd[1582]: fatal: Missing privilege separation directory: /run/sshd

有任何想法吗?

答案1

这里有类似的错误,看起来启动时sshd无法创建/run/sshd目录,所以在这里通过脚本来完成它,如下所示:

在 中创建sshddir包含以下内容的脚本/etc/init.d/

#!/bin/sh

### BEGIN INIT INFO
# Provides:          sshddir
# Required-Start:    $all
# Required-Stop:     $network
# Should-Start:      $network
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Short-Description: Sshd /run/sshd Directory
# Description:       Intended to create /run/sshd directory for Sshd.
### END INIT INFO

mkdir -p /run/sshd

chmod -R 755 /run/sshd

$ sudo chmod 755 /etc/init.d/sshddir

$ sudo update-rc.d sshddir defaults

这样,就可以重新启动并访问它。

答案2

只需创建包含以下内容的sshddir.service文件/etc/system/systemd/

[Unit]
Description=Run Sshd Directory Creator
After=network.target auditd.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Service]
ExecStart=/usr/bin/sshddir
ExecReload=/usr/bin/sshddir
Restart=always
RestartPreventExitStatus=255
Type=forking

[Install]
WantedBy=multi-user.target
Alias=sshddir.service

然后:

2a-$ sudo systemctl daemon-reload

2b-$ sudo systemctl enable sshddir

但需要首先删除SysVinit托管文件:

1a-$ update-rc.d sshddir disable

1b-$ update-rc.d sshddir remove

然后,重新启动机器。

看起来像是在启动时以某种方式systemd删除了文件夹,从而产生错误。/run/sshd

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