公钥认证失败

Question

我使用的是 ubuntu 13.10，服务器运行的是 ubuntu 12.04。我已经使用ssh-keygen生成了私钥和公钥，并将id_rsa.pub放在服务器端并authorzied_keys根据我在互联网上找到的方法添加它。但是，我在尝试登录时仍然需要输入密码。我已将主目录设置为 700，将 .ssh 目录设置为 700，将 authorzied_keys 文件设置为 600，并且检查了 sshd_config 文件，但没有任何反应。

调试信息（带有 -vvv 选项）和 sshd_config 如下，服务器的 auth.log 文件中没有列出任何内容。

我什至在客户端和服务器端都更新了 openssh-server openssh-client 。

还有什么我需要做的吗？感谢您提供任何信息。

debug3: load_hostkeys: loading entries for host "[xxx.101.15.62]:2222" from file "/home/leetom/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/leetom/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "[xxx.101.15.62]:2222" from file "/home/leetom/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/leetom/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug1: Host '[xxx.101.15.62]:2222' is known and matches the ECDSA host key.
debug1: Found key in /home/leetom/.ssh/known_hosts:2
debug1: ssh_ecdsa_verify: signature correct
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: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/leetom/.ssh/id_rsa ((nil)),
debug2: key: /home/leetom/.ssh/id_dsa ((nil)),
debug2: key: /home/leetom/.ssh/id_ecdsa ((nil)),
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/leetom/.ssh/id_rsa
debug1: read PEM private key done: type RSA
debug3: sign_and_send_pubkey: RSA 68:51:b6:ed:cc:c2:54:f4:xx:15:41:d7:f5:4a:0e:da
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/leetom/.ssh/id_dsa
debug3: no such identity: /home/leetom/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/leetom/.ssh/id_ecdsa
debug3: no such identity: /home/leetom/.ssh/id_ecdsa: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
leetom@xxx.101.15.62's password: 

和 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 0.0.0.0
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
#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 yes
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
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

Answer 1

这有点像我们使用您的私钥尝试加密登录，然后我们不得不尝试其他人，因为它不被接受：

debug1: Trying private key: /home/leetom/.ssh/id_rsa
debug1: read PEM private key done: type RSA
debug3: sign_and_send_pubkey: RSA 68:51:b6:ed:cc:c2:54:f4:xx:15:41:d7:f5:4a:0e:da
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password

最简单的问题可能是您复制公钥，因为我在尝试使用我知道另一端没有的密钥进行身份验证时得到相同的响应。

与其手动复制 ID，不如试试ssh-copy-id- 输入您的密码，它就会更新authorized_keys。这应该 (a) 肯定选择与ssh应该选择的键相同的键，(b) 确保您没有意外添加任何格式错误。

如果这对您有用，请比较添加到authorized_keysby的行ssh-copy-id，希望您会明白出了什么问题。

Answer 2

权限可能是导致公钥身份验证失败的另一种问题：检查您的~和~/.ssh目录是否除了您的用户之外的任何人都无法读取（chmod 700 ~ && chmod 700 ~/.ssh可以解决这个问题）。

编辑：权限 750 也~应该没问题。