Не удается подключиться к SSH-серверу. /.ssh/authorized_keys: разрешение отклонено

FredS спросил: 03 февраля 2018 в 10:09 в: ubuntu

Я пытаюсь настроить сервер Ubuntu с SSH-аутентификацией через ключи RSA последние 4-5 часов, но я не могу заставить его работать.

Я запускаю сервер Unbuntu 16.04.3 с SSH-2.0-OpenSSH_7.2p2. Просто переустановил сервер.

Я установил права на доступ к папке ~/.ssh для 700 и /.ssh/authorized_keys, чтобы 600

Ключ был сделан Puttygen (RSA 2048 бит), и я правильно сформировал его до ssh-rsa <long random string> comment, прежде чем добавлять его в /home/user/.ssh/authorized_keys

Это ошибка, которую я получаю при попытке войти в систему с помощью ключа:

login as: user
Server refused our key

Это сообщение об ошибке, которое я получаю из журнала отладки sshd.

Feb 27 23:23:21 CSGO6 sshd[1439]: debug1: Could not open authorized keys '/home/user/.ssh/authorized_keys': Permission denied

Кто-нибудь понимает, почему у sshd нет разрешения на файл authorized_keys?

Вот 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 0.0.0.0Protocol 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 DEBUG3# Authentication:
LoginGraceTime 120
PermitRootLogin prohibit-password
StrictModes yesRSAAuthentication 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 yesX11Forwarding 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
user@CSGO6:~$ # Package generated configuration file
user@CSGO6:~$ # See the sshd_config(5) manpage for details
user@CSGO6:~$
user@CSGO6:~$ # What ports, IPs and protocols we listen for
user@CSGO6:~$ Port 22
#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 DEBUG3# Authentication:
LoginGraceTime 120
PermitRootLogin prohibit-password
StrictModes yesRSAAuthentication 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 yesX11Forwarding 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

Вот код ls -la как папки .ssh, так и authorized_keys

user@CSGO6:~$ ls -la /home/user/.ssh/
total 12
drwx------ 2 user user 4096 Feb 27 23:39 .
drwxr-xr-x 5 user user 4096 Feb 27 23:14 ..
-rw------- 1 root root  802 Feb 27 23:39 authorized_keys

Btw, используя тот же rsa-key для ssh для моей малины pi не проблема.

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