要禁用密码身份验证,我在sshd_config中设置了以下值
ChallengeResponseAuthentication no PasswordAuthentication no UsePAM no
当我尝试使用我的私钥登录时,我得到了
Permission denied (publickey).
如果我然后将UsePAM更改为是,我可以使用我的私钥登录.为什么？
我正在从OSX连接到Ubuntu 12.04 64位主机
ssh -i ~/.ssh/deploy -l deploy localhost -p 2222 -v
这是详细的ssh输出：
OpenSSH_5.9p1,OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /Users/<user>/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: Connecting to localhost [127.0.0.1] port 2222. debug1: Connection established. debug1: identity file /Users/<user>/.ssh/deploy type 1 debug1: identity file /Users/<user>/.ssh/deploy-cert type -1 debug1: Remote protocol version 2.0,remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9 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: Server host key: RSA 50:db:75:ba:11:2f:43:c9:ab:14:40:6d:7f:a1:ee:e3 debug1: Host '[localhost]:2222' is known and matches the RSA host key. debug1: Found key in /Users/<user>/.ssh/known_hosts:2 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/<user>/.ssh/key1 debug1: Authentications that can continue: publickey debug1: Offering RSA public key: /Users/<user>/.ssh/deploy debug1: Authentications that can continue: publickey debug1: No more authentication methods to try. Permission denied (publickey).
解决方法
如果没有PAM(可插入的身份验证模块),则需要更复杂的ssh配置进行身份验证.你正在寻找这个,实际上：
# grep Password /etc/ssh/sshd_config PermitEmptyPasswords no PasswordAuthentication no
这将禁用passworded登录.确保正确建立公钥设置.
