尝试通过 SSH 连接到远程计算机，但仍要求输入密码

Question

尝试通过 SSH 连接到远程计算机，但仍要求输入密码。

我有多台运行 SElinux 的计算机，其中只有一台让我在没有密码的情况下很难使用 ssh。

我做了一个 ssh-copy-id，我可以在 .ssh/authorized_keys 中看到我的密钥。

我 chmod 700 .ssh 和 chmod 600 ./ssh/* 中的所有文件

如果我执行 ssh -v 这是我的输出：

OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to wcmisdlin05 [10.52.208.224] port 22.
debug1: Connection established.
debug1: identity file /home/jsmith/.ssh/identity type -1
debug1: identity file /home/jsmith/.ssh/id_rsa type 1
debug1: identity file /home/jsmith/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'wcmisdlin05' is known and matches the RSA host key.
debug1: Found key in /home/jsmith/.ssh/known_hosts:9
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_501' not found

debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_501' not found

debug1: Unspecified GSS failure.  Minor code may provide more information


debug1: Unspecified GSS failure.  Minor code may provide more information


debug1: Next authentication method: publickey
debug1: Offering public key: /home/jsmith/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /home/jsmith/.ssh/identity
debug1: Trying private key: /home/jsmith/.ssh/id_dsa
debug1: Next authentication method: password

有人可以告诉我为什么它不能在这台远程计算机上工作吗？

Answer 1

我经常在涉及SELinux 的CentOS 6 机器上遇到类似的错误ssh-copy-id。

当ssh-copy-id创建授权密钥文件将其与适当的权限创建它，而是用错了SELinux的标签。对此的修复是使用以下命令将标签恢复为其策略默认值：

restorecon -R ~/.ssh

Answer 2

如果可能的话，从服务器端调试这些东西总是容易得多。如果您可以在调试模式下在另一个端口上启动 sshd，它会立即告诉您密钥被拒绝的原因（我的猜测是您的主目录是组可写的）。例如，您可以在端口 2222 上以调试模式启动 sshd /usr/sbin/sshd -d -p 2222，然后使用 连接ssh -p 2222 user@remotehost。

Answer 3

我前段时间在 RHEL5 上经历过这种情况（我不知道这是否是你使用的发行版），并发现只有当我使用 ssh-copy-id 时才会出现这种情况。尝试将密钥文件 scp 到正确的文件夹，当然还要重置权限