私は別の解決策を試しましたが、そのうち何も効果がありませんでした。
私のコンピュータでssh-keygenを使ってキーを生成しました。私のLinuxサーバーにこのキーを追加しましたが、/root/.ssh/authorized_keysうまく機能します。
2番目のLinuxサーバーでも同じことをしました。しかし、これはうまくいきません。私は別のことを試しました：
- 私の鍵を入れて
/root/.ssh/authorized_keys2 - 編集
/etc/ssh/ssh_configと/etc/ssh/sshd_config（行にコメントを付けてコメントを解除する） - 正しい許可（
.sshディレクトリ700個、authenticate_keysファイル600個）
何も動作しないようです。それでもパスワードの入力を求められます。
何が問題なのでしょうか？
ありがとうございます。
編集する：
`sshd_config
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
#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 INFO
# Authentication:
LoginGraceTime 120
#PermitRootLogin without-password
PermitRootLogin no
StrictModes yes
AllowUsers user
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
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
Ciphers [email protected],[email protected],aes256-ctr,aes128-ctr
MACs [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,hmac-ripemd160
KexAlgorithms diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1
私のssh -vv結果
OpenSSH_6.7p1 Debian-5+deb8u3, OpenSSL 1.0.1t 3 May 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to IP [IP] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.7p1 Debian-5+deb8u3
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7p1 Debian-5+deb8u3
debug1: match: OpenSSH_6.7p1 Debian-5+deb8u3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: [email protected],ssh-ed25519,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],[email protected],arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],[email protected],arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1,[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1,[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-ed25519
debug2: kex_parse_kexinit: [email protected],[email protected],aes256-ctr,aes128-ctr
debug2: kex_parse_kexinit: [email protected],[email protected],aes256-ctr,aes128-ctr
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,hmac-ripemd160
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,hmac-ripemd160
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: setup [email protected]
debug1: kex: server->client aes128-ctr [email protected] none
debug2: mac_setup: setup [email protected]
debug1: kex: client->server aes128-ctr [email protected] none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<3072<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: bits set: 1580/3072
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: ED25519 67:fd:fd:6e:a5:c1:32:96:9d:33:32:1a:cf:83:94:ea
debug1: Host '[IP]:22' is known and matches the ED25519 host key.
debug1: Found key in /root/.ssh/known_hosts:1
debug2: bits set: 1546/3072
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /root/.ssh/id_rsa (0x7f84b8ce74a0),
debug2: key: /root/.ssh/id_dsa ((nil)),
debug2: key: /root/.ssh/id_ecdsa ((nil)),
debug2: key: /root/.ssh/id_ed25519 ((nil)),
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /root/.ssh/id_rsa
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Trying private key: /root/.ssh/id_ecdsa
debug1: Trying private key: /root/.ssh/id_ed25519
debug2: we did not send a packet, disable method
user@IPのパスワード：
/var/log/auth.log(リモートサーバーから)
Jul 12 12:24:43 ns3111463 sshd[12971]: input_userauth_request: invalid user root [preauth]
Jul 12 12:24:44 ns3111463 sshd[12971]: Connection closed by IP [preauth]
Jul 12 12:24:46 ns3111463 sshd[12973]: Connection closed by IP [preauth]
Jul 12 12:24:48 ns3111463 sshd[11787]: Received signal 15; terminating.
Jul 12 12:24:48 ns3111463 sshd[12977]: Server listening on 0.0.0.0 port 22.
Jul 12 12:24:48 ns3111463 sshd[12977]: Server listening on :: port 22.
Jul 12 12:24:50 ns3111463 sshd[12978]: Connection closed by IP [preauth]
Jul 12 12:24:51 ns3111463 sshd[12980]: User root from IP not allowed because not listed in AllowUsers
Jul 12 12:24:51 ns3111463 sshd[12980]: input_userauth_request: invalid user root [preauth]
Jul 12 12:24:51 ns3111463 sshd[12980]: Connection closed by IP [preauth]
Jul 12 12:25:49 ns3111463 sshd[12977]: Received signal 15; terminating.
Jul 12 12:25:49 ns3111463 sshd[13029]: Server listening on 0.0.0.0 port 22.
Jul 12 12:25:49 ns3111463 sshd[13029]: Server listening on :: port 22.
Jul 12 12:25:50 ns3111463 sshd[13030]: User root from IP not allowed because not listed in AllowUsers
Jul 12 12:25:50 ns3111463 sshd[13030]: input_userauth_request: invalid user root [preauth]
Jul 12 12:25:51 ns3111463 sshd[13030]: Connection closed by IP [preauth]
Jul 12 12:25:53 ns3111463 sshd[13032]: Connection closed by IP [preauth]
Jul 12 12:37:41 ns3111463 sshd[13552]: Connection closed by IP [preauth]
Jul 12 12:38:09 ns3111463 sshd[13598]: Connection closed by IP [preauth]
ベストアンサー1
したがって、公開鍵認証に関しては、sshは権限に非常に面倒なので注意する必要があります。
.ssh何を制限すべきかについては、少なくともあなたの言葉が正しいです。しかし、それはすべてではありません。また、/rootそれぞれユーザーが制限して所有する必要があります。
したがって、グループが自宅に書き込めないようにユーザーの「家」を調整し、755家の正しい所有者も割り当ててみてください。
また、「authorized_keys」の代わりに「authorized_keys2」を使用するのはなぜですか？うまくいかないと思いますか？