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内网,想做ssh root公钥登录,配置好之后还是提示输入密码,现象:
在服务器端使用其他端口开放sshd:

$/usr/sbin/sshd -p 1234

此时客户端可以无密码登录,但是22端口的sshd还是需要密码

停止服务端22端口的sshd(service),手动使用22端口启动:

$/usr/sbin/sshd -p 22

此时客户端可以无密码登录

太诡异了,关键问题,如果是网上说的文件夹权限或者是操作疏漏什么的,怎么手动启动sshd就可以呢?求大神指导

客户端调试信息:

ssh root@git.com -vv


debug1: Next authentication method: publickey
debug1: Trying private key: /c/Users/Zhou/.ssh/identity
debug1: Offering public key: /c/Users/Zhou/.ssh/id_rsa
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Offering public key: /c/Users/Zhou/.ssh/id_dsa
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
root@git.com's password:

补充

使用默认自启动的服务时候,客户端无法无密码登录 -vvv 参数结果如下:

debug1: Next authentication method: publickey
debug1: Trying private key: /c/Users/Zhou/.ssh/identity
debug3: no such identity: /c/Users/Zhou/.ssh/identity
debug1: Offering public key: /c/Users/Zhou/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Offering public key: /c/Users/Zhou/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
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

使用$/usr/sbin/sshd -p 22启动服务,客户端可以无密码登录 -vvv 参数结果如下:

debug1: Next authentication method: publickey
debug1: Trying private key: /c/Users/Zhou/.ssh/identity
debug3: no such identity: /c/Users/Zhou/.ssh/identity
debug1: Offering public key: /c/Users/Zhou/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-rsa blen 277
debug2: input_userauth_pk_ok: fp ca:03:6e:80:a9:5f:7c:12:69:dc:e5:f9:3c:c8:4f:83
debug3: sign_and_send_pubkey
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).

sshd_config

#       $OpenBSD: sshd_config,v 1.80 2008/07/02 02:24:18 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/local/bin:/bin:/usr/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 change a
# default value.

#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::

# Disable legacy (protocol version 1) support in the server for new
# installations. In future the default will change to require explicit
# activation of protocol 1
Protocol 2

# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key

# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024

# Logging
# obsoletes QuietMode and FascistLogging
SyslogFacility AUTH
#SyslogFacility AUTHPRIV
LogLevel debug

# Authentication:

#LoginGraceTime 2m
PermitRootLogin yes
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10

RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile      .ssh/authorized_keys
#AuthorizedKeysCommand none
#AuthorizedKeysCommandRunAs nobody

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
PasswordAuthentication yes

# Change to no to disable s/key passwords
#ChallengeResponseAuthentication yes
ChallengeResponseAuthentication no

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

# GSSAPI options
#GSSAPIAuthentication no
GSSAPIAuthentication yes
#GSSAPICleanupCredentials yes
GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no

# 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 no
UsePAM yes

# Accept locale-related environment variables
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
AcceptEnv XMODIFIERS

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#UsePrivilegeSeparation yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#ShowPatchLevel no
#UseDNS yes
#PidFile /var/run/sshd.pid
#MaxStartups 10
#PermitTunnel no
#ChrootDirectory none

# no default banner path
#Banner none

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

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

系统服务器的ssh在进程中的体现:

[root@localhost ~]# ps -ef | grep sshd
root      1233     1  0 16:54 ?        00:00:00 /usr/sbin/sshd
root      1444  1233  0 16:55 ?        00:00:00 sshd: root@pts/0

自己启动的ssh:/usr/sbin/sshd -d -p 1234

root      1470  1449  0 17:03 pts/0    00:00:00 /usr/sbin/sshd -d -p 1234
root      1471  1233  0 17:03 ?        00:00:00 sshd: root@pts/1
2014-03-26 提问
1 个回答
1

已采纳

问题已解决:是因为.ssh目录没有ssh_home_t标签!!通过下面命令重置。参考public-key-authentication-fails-only-when-sshd-is-daemon 一次由SELinux引起的ssh公钥认证失败问题

restorecon -r -vv /root/.ssh
[root@localhost ~]# restorecon -r -vv .ssh
restorecon reset /root/.ssh context unconfined_u:object_r:admin_home_t:s0->unconfined_u:object_r:ssh_home_t:s0
restorecon reset /root/.ssh/id_rsa context unconfined_u:object_r:admin_home_t:s0->unconfined_u:object_r:ssh_home_t:s0
restorecon reset /root/.ssh/known_hosts context unconfined_u:object_r:admin_home_t:s0->unconfined_u:object_r:ssh_home_t:s0
restorecon reset /root/.ssh/authorized_keys context unconfined_u:object_r:admin_home_t:s0->unconfined_u:object_r:ssh_home_t:s0
restorecon reset /root/.ssh/id_rsa.pub context unconfined_u:object_r:admin_home_t:s0->unconfined_u:object_r:ssh_home_t:s0

通过这个命令查看文件夹或文件的标签

[root@localhost ~]# ls -laZ
drwx------. root root unconfined_u:object_r:ssh_home_t:s0 .ssh

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