MrZ*_*der 6 networking ssh ubuntu-server
我有一个带有两个网络接口的 Ubuntu 服务器和一个名为“bluewire”的命名空间(以连接到它的以太网电缆的颜色命名)。
bluewire 命名空间添加了 enp4s0 接口,并与 WAN 隔离(这是需要的)。我可以使用 PuTTY 从桌面通过 192.168.1.1:22 SSH 连接到服务器本身,但是当我尝试通过 192.168.1.2:22 连接时,PuTTY 会抛出“连接被拒绝”错误。我怀疑命名空间根本没有侦听任何端口。
困境:如何在命名空间内启用侦听,以便我可以通过蓝线通过 SSH 进入?或者,如果不是听力问题,我需要做什么才能让 SSH 通过蓝线工作?
附加信息:
ip netns exec bluewire
OpenSSH端都是开放的。iptables
bluewire 命名空间的规则非常开放(所有内容都设置为ACCEPT
)。ip netns exec bluewire tcpdump -n dst port 22
,我可以假设服务器知道它正在接收来自桌面的请求。netns -an
显示服务器本身正在侦听端口 22,但ip netns exec bluewire netstat -an
会出现一个空表。这就是我怀疑问题所在。ifdown
红线接口并限制服务器对本地网络的访问,这样我只能通过桌面 SSH 来更改锁。编辑
根据下面 Blerg 的评论,屏幕截图 netstat -plunt
这两个接口都可以通过我桌面上的 Windows cmd 进行 ping 操作。
据我所知,路由器没有阻止内部网络上的任何端口;它只是阻止来自外部世界的所有访问,但我用于 OpenVPN 的 1194 除外。我可以使用桌面 PuTTY 通过 .1 接口进行连接,没有任何问题,所以我怀疑路由器是罪魁祸首......也许吧。
我的/etc/ssh/sshd_config
档案
[07:28]<~ @ > $ cat /etc/ssh/sshd_config
# Package generated configuration file
# See the sshd_config(5) manpage for details
# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
ListenAddress 192.168.1.1
ListenAddress 192.168.1.2
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes
# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin prohibit-password
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys
# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no
# Change to no to disable tunnelled clear text passwords
PasswordAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no
#MaxStartups 10:30:60
Banner /etc/issue.net
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
[07:29]<~ @ > $
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小智 5
对于那些感兴趣的人,我从这里找到了解决方案:https : //blog.bofh.it/debian/id_446。
诀窍是在每个命名空间中启动一个单独的 sshd 服务器:
ip netns exec mynamesapce /usr/sbin/sshd -o PidFile=/run/sshd-mynamespace.pid
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当然防火墙必须允许tcp/ssh
从您的帖子中我可以看出,您可能只让 SSH 守护进程在一个接口上侦听。在您的/etc/ssh/sshd_config
文件中,确保您已ListenAddress
列出如下:#ListenAddress
。如果启用,OpenSSH 服务器将仅侦听指定地址上的传入连接。如果您想对多个 IP 使用 ListenAddress,则需要将它们放在单独的行上,如下所示:
监听地址 192.168.1.1 监听地址 192.168.1.2