三歩あるけば物も忘れる

私メタボックル!お腹のお肉の妖精さ!

ユーザ用ツール

サイト用ツール


サイドバー

  
人気ページTOP10

463

インフラ構築:RHEL8:30.SSH-リモート接続

インフラ構築/RHEL8/30.SSH-リモート接続

サーバ側の設定は、/etc/ssh/sshd_configを設定する。

/etc/ssh/ssh_config 他のサーバにsshで接続する設定
/etc/ssh/sshd_config 他のサーバからsshで接続されるときの設定

SSHリモート接続設定

SSH設定ファイルの主な変更項目について記載する。

#変更
vi /etc/ssh/sshd_config

#文法テスト
sshd -t

#適用
systemctl restart sshd

ポート指定

#初期値
#Port 22

#変更後(IPv4のみ)
Port XXXX

接続を許可するプロトコル指定

#初期値(全てのプロトコル)
#AddressFamily any

#変更後(IPv4のみ)
AddressFamily inet

接続元のDNS問合せ無効化

#初期値(有効化)
#UseDNS no

#変更後(無効化)
UseDNS no

https://blog.framinal.life/entry/2018/08/09/172436

プロトコル指定

#初期値記載なし

#変更後(SSH2のみ)
Protocol 2

RHosts関連設定(念の為)

#初期値
#IgnoreRhosts yes

#変更後(~/.rhosts ~/.shostsの無視)
IgnoreRhosts yes

rootユーザのログイン無効化

#初期値(有効化)
PermitRootLogin yes

#変更後(無効化)
PermitRootLogin no

パスワード認証の有効化

公開鍵でなく、パスワード認証としたい場合に設定

#初期値(公開鍵認証のみ)
#PasswordAuthentication yes
#PermitEmptyPasswords no

#変更後 ※パスワード認証にしたい場合
PasswordAuthentication yes   #パスワード認証を許可するか
#PermitEmptyPasswords no     #パスワードなしでの認証を許可するか

その他

初期値から変更しない

#PAM認証を使うか
UsePAM yes

#x11転送許可
X11Forwarding yes


https://unskilled.site/sshd_config%E3%81%AE%E8%A8%AD%E5%AE%9A%E9%A0%85%E7%9B%AE%E3%81%AE%E7%90%86%E8%A7%A3%E3%82%92%E7%9B%AE%E6%8C%87%E3%81%99/

初期値

#       $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/local/bin:/usr/bin:/usr/local/sbin:/usr/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.

# If you want to change the port on a SELinux system, you have to tell
# SELinux about this change.
# semanage port -a -t ssh_port_t -p tcp #PORTNUMBER
#
#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

# This system is following system-wide crypto policy. The changes to
# crypto properties (Ciphers, MACs, ...) will not have any effect here.
# They will be overridden by command-line options passed to the server
# on command line.
# Please, check manual pages for update-crypto-policies(8) and sshd_config(5).

# Logging
#SyslogFacility AUTH
SyslogFacility AUTHPRIV
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

#PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys

#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 yes
#PermitEmptyPasswords no
PasswordAuthentication no

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes
ChallengeResponseAuthentication no

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

# GSSAPI options
GSSAPIAuthentication yes
GSSAPICleanupCredentials no
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
#GSSAPIEnablek5users no

# 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'.
# WARNING: 'UsePAM no' is not supported in Fedora and may cause several
# problems.
UsePAM yes

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes

# It is recommended to use pam_motd in /etc/pam.d/sshd instead of PrintMotd,
# as it is more configurable and versatile than the built-in version.
PrintMotd no

#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /var/run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# Accept locale-related environment variables
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
AcceptEnv XMODIFIERS

# override default of no subsystems
Subsystem sftp  /usr/libexec/openssh/sftp-server

# Example of overriding settings on a per-user basis
#Match User anoncvs
#       X11Forwarding no
#       AllowTcpForwarding no
#       PermitTTY no
#       ForceCommand cvs server

インフラ構築/RHEL8/30.SSH-リモート接続.txt · 最終更新: 2021/01/04 by admin