SELINUX导致的SSH密匙无法创建和访问的问题

故障现象：

执行生成密匙命令时提示：

#ssh-keygen -t dsa

......

open /root/.ssh/id_dsa failed: Permission denied.

Saving the key failed: /root/.ssh/id_dsa.

同时：

放置好其他机器的authorized_keys，也无法通过密匙访问,任然需要密码。

Connection to 192.168.X.X closed.

[root@hadoop-0 .ssh]# ssh 192.168.X.X

root@192.168.110.109's password:

原来的/etc/selinux/config

# This file controls the state of SELinux on the system.

# SELINUX= can take one of these three values:

#     enforcing - SELinux security policy is enforced.

#     permissive - SELinux prints warnings instead of enforcing.

#     disabled - No SELinux policy is loaded.

SELINUX=enforcing

# SELINUXTYPE= can take one of these two values:

#     targeted - Targeted processes are protected,

#     mls - Multi Level Security protection.

SELINUXTYPE=targeted

故障解决方法：

修改

# This file controls the state of SELinux on the system.

# SELINUX= can take one of these three values:

#     enforcing - SELinux security policy is enforced.

#     permissive - SELinux prints warnings instead of enforcing.

#     disabled - No SELinux policy is loaded.

SELINUX=disabled

# SELINUXTYPE= can take one of these two values:

#     targeted - Targeted processes are protected,

#     mls - Multi Level Security protection.

SELINUXTYPE=targeted

重启服务器

能通过密匙访问了

[root@XX-0 .ssh]# ssh 192.168.x.x

Last login: Thu Apr 19 01:52:15 2012 from 192.168.x.x

------------------------------------------------------

生成密匙

# ssh-keygen -t dsa

Your public key has been saved in /root/.ssh/id_dsa.pub.

The key fingerprint is:

96:22:e3:a9:ac:a0:45:24:19:c2:c2:1a:75:d9:61:f9 root@XX-test

The key's randomart image is:

--[ DSA 1024]----

|=.. .ooo         |

| = ...o          |

Y

能正常生成密匙，至此故障解决。