○ sshd_config 4 Xen

・openssh-7.5p1で使っています
・"$ man sshd_config"を実行してマニュアルを読みましょう
・個人の設定に合わせて下さい
・完全コピーしないこと (エラーが出ることあり)
・#の後に半角空きがあるもの 設定の説明
・#の後に半角空きがないもの 設定の無効 (Default値が使われます)
紫色文字 変更部分

○/etc/ssh/sshd_config

・"AddressFamily inet" (IPv4) 用です
・"ListenAddress 0.0.0.0" (IPv4) 用です
・デフォルトのwheelグループにはrootが含まれないので注意
・"SyslogFacility AUTHPRIV"の場合、/var/log/secureに出力します
・"PermitRootLogin"は"prohibit-password"になりました 7.0p1以降
・"PubkeyAuthentication"による認証を許可しています
・"PermitUserRC" 6.7p1以降で有効です

 

 
 

 

 
 
 
 

Default
Default any
 
 
 

Default
Default
Default
Default

 
Default

 
Default AUTH 
Default INFO

 

Default
Default
Default
Default
Default

Default

 
 
Default both

Default

Default
 

 
Default
 
 
Default no
 
Default

 
Default yes
Default

 
Default yes

 
Default
Default
Default
Default

 
Default
Default

 
 
 
 
 
 
 
 
 
Default

Default
Default
Default
Default
Default
Default yes
Default
Default yes
Default
Default
Default
Default
Default yes
Default
Default
Default
Default
Default
Default
Default
Default
Default

 
 

 
 

 
 
 
 
 
 
#	$OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm 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:/usr/local/bin

# 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 inet
ListenAddress 0.0.0.0
#ListenAddress ::
AllowGroups wheel

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

# Ciphers and keying
#RekeyLimit default none

# Logging
SyslogFacility AUTHPRIV
LogLevel VERBOSE

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#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 yes
# 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 no to disable s/key passwords
ChallengeResponseAuthentication no

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

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

# 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 an
# 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 no

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
X11UseLocalhost no
#PermitTTY yes
PrintMotd no
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#PermitUserEnvironment no
PermitUserRC 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

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

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

○sshd_configのチェック

・テストモード、設定ファイルや鍵の正当性チェック

# sshd -t

・拡張テストモード。設定ファイルの正当性を検査し
・有効な設定項目を標準出力に表示したあと終了

# sshd -T

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