![如何禁用密码和 root ssh?](https://linux22.com/image/889905/%E5%A6%82%E4%BD%95%E7%A6%81%E7%94%A8%E5%AF%86%E7%A0%81%E5%92%8C%20root%20ssh%EF%BC%9F.png)
sudo systemctl restart ssh
我在 AWS EC2 上运行 VPS 的 16.04 LTS上重新启动了 ssh xenial
,但在使用 ssh 连接时仍然会提示输入密码。如何禁用 root ssh 并禁用密码登录?
ubuntu@ip-xxx-xx-x-xx:~$ 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 0.0.0.0
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
PermitRootLogin no
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 yes
# 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
AllowUsers thufir ubuntu
DenyUsers root
ubuntu@ip-xxx-xx-x-xx:~$
两个允许的用户都属于该sudo
组。
的日志/var/log/auth.log
显示:
sshd[2035]: 从 xxx.xxx.xxx.xxx 端口 43986 ssh2 接受 thufir 的键盘交互/pam
答案1
如何禁用密码和 root ssh?
让我们重新表述一下,我想你想
- 拒绝所有 root 登录
- 拒绝所有用户的所有密码登录
- 允许其他用户使用其他身份验证方法(
publickey
)
这是通过以下方式实现的配置选项:
PermitRootLogin no
PasswordAuthentication no
ChallengeResponseAuthentication no
如果您更改配置以包含这些内容(不附加到末尾!)并重新启动服务器,则应该可以实现上述目的。如果没有,请澄清问题并按照要求发布日志。
答案2
打开sshd_config
:
EDITOR=vim sudoedit /etc/ssh/sshd_config
请注意,你可以vim
用你选择的任何编辑器替换,例如nano
。在该文件中,确保PermitRootLogin
已禁用:
PermitRootLogin no