主页 / server / 问题 / 994894
Accepted
Woodstock
Asked: 2019-12-10 06:19:44 +0800 CST

正确配置 SSHD 配置文件？

  • 772

我在我的 linux 机器上使用 ssh，我想确保它尽可能防水，只允许通过ed25519椭圆曲线加密 sigs 进行 ssh。

我以为我设置正确，禁用密码，没有 PAM 等。

它似乎工作正常，但今天我注意到我没有authorised_keys指定文件，并且我已经PubkeyAuthentication注释掉了。

当密码身份验证设置为否时，这些内容是否隐式设置为是？

这个设置好吗？

#       $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key

# Ciphers and keying
#RekeyLimit default none

# Logging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#PubkeyAuthentication yes

# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile     .ssh/authorized_keys .ssh/authorized_keys2

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
#PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no

# Set this to 'yes' to enable PAM authentication, account processing
linux

1 个回答

  1. Best Answer

    我不确定是否排除所有公钥算法，除了ed25519不是过分热心，它是一个很好的安全策略。Security StackExchange当然可以告诉你更多关于这个主题的信息。

    SSH默认值在sshd_config 手册页中列出，但最好阅读系统上的那个：例如 Debian 更改了一些上游默认值。PubkeyAuthentication' 的默认值是yes并且AuthorizedKeysFile' 的默认值是~/.ssh/authorized_keys（美式拼写）。

    假设您想要：禁用所有基于密码的身份验证并仅使用ed25519公钥加密，考虑到您只需要的上游默认值：

    ChallengeResponseAuthentication no
#GSSAPIAuthentication no by default
#HostbasedAuthentication no by default
#KbdInteractiveAuthentication defaults to ChallengeResponseAuthentication
#KerberosAuthentication no by default
PasswordAuthentication no
#PubkeyAuthentication yes by default
PubkeyAcceptedKeyTypes ssh-ed25519
UsePAM yes

    整体禁用PAM会禁用帐户和会话PAM 模块，从而为用户提供更好的环境。无论如何都不会使用 auth PAM 模块，因为密码和质询-响应身份验证都被禁用。

    • 2

相关问题