p0t: 鍵認証に目を反らすな

うーん・・・ パーミッションですが、$HOME/.sshだけでなく、 /や/homeや/home/USERNAMEが775だったりしてもダメなので、その確認をしたほうがいいかも 一度 StrictModes no でsshdを動かしてみるとか・・・

Posted by: Ryosuke | 2006年09月30日 03:58

Ryosukeさんの情報で鍵認証できない問題が解決しました。ありがとうございます!鍵認証に対する苦手意識が消えた!心理カウンセラーにも治せない俺の下らない悩みがどんどん解決していきます。

まとめときます。

手順:

ssh-keygen -t rsa
ssh komagata@komagata.no-ip.org "echo `cat ~/.ssh/id_rsa.pub`  >> ~/.ssh/authorized_keys"

チェックするところ:

  • RSAAuthentication yes、PubkeyAuthentication yes(普通はデフォルト)
  • /.sshが700、./.ssh/authorized_keysが600
  • /, /home, ~にgroup, other書き込み権限が無いこと(権限関連はStrictModes noで一応無視できる)

デフォルトですが、一応sshd_config載せときます。

# Package generated configuration file
# See the sshd(8) 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
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
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 no

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes

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

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
KeepAlive 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

UsePAM yes

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