在亚马逊EC2上，ssh连接时出现“Permission denied (publickey)”错误

Question

我一直通过Win7上的SSH访问我的EC2实例。现在我想在Ubuntu 12.04上的另一台PC上进行ssh连接，但是出现了“Permission denied (publickey)”错误。我已经搜索了这个问题，并尝试了以下方法：

• 删除现有密钥并在EC2仪表板上创建/下载新密钥。
• 将新密钥放置在我的〜/.ssh文件夹中。

• 使用此命令更改密钥的访问权限（也尝试过400）：

  chmod 600 ~/.ssh/leno.pem

• 使用此命令更改.ssh文件夹的访问权限（也尝试过700）：

  chmod 755 ~/.ssh

• 也尝试了以下操作：

  add-ssh ~/.ssh/leno.pem

没有成功。当我尝试运行以下命令时：

ssh -vvv -i ~/.ssh/leno.pem [e-mail]

我收到了这条消息：

OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to ec2-50-19-199-128.compute-1.amazonaws.com [50.19.199.128] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/murat/.ssh/leno.pem" as a RSA1 public key
debug1: identity file /home/murat/.ssh/leno.pem type -1
debug1: identity file /home/murat/.ssh/leno.pem-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-4ubuntu6
debug1: match: OpenSSH_5.5p1 Debian-4ubuntu6 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "ec2-50-19-199-128.compute-1.amazonaws.com" from file "/home/murat/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/murat/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: [e-mail],[e-mail],ssh-rsa
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: [e-mail],[e-mail],ssh-rsa,[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[e-mail],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[e-mail],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[e-mail],zlib
debug2: kex_parse_kexinit: none,[e-mail],zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[e-mail],hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[e-mail],hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[e-mail]
debug2: kex_parse_kexinit: none,[e-mail]
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
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
debug2: dh_gen_key: priv key bits set: 142/256
debug2: bits set: 534/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA c4:de:26:09:64:6f:7c:48:6b:2b:ef:8c:c5:b7:cc:1f
debug3: load_hostkeys: loading entries for host "ec2-50-19-199-128.compute-1.amazonaws.com" from file "/home/murat/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/murat/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "50.19.199.128" from file "/home/murat/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/murat/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug1: Host 'ec2-50-19-199-128.compute-1.amazonaws.com' is known and matches the RSA host key.
debug1: Found key in /home/murat/.ssh/known_hosts:1
debug2: bits set: 514/1024
debug1: ssh_rsa_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: leno.pem (0x7feb7db9aa10)
debug2: key: /home/murat/.ssh/leno.pem ((nil))
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
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: Offering RSA public key: leno.pem
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/murat/.ssh/leno.pem
debug1: read PEM private key done: type RSA
debug3: sign_and_send_pubkey: RSA ab:3a:89:be:34:43:5a:40:5f:8a:0c:ba:5d:33:bd:cb
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
Permission denied (publickey).

我怎样才能通过ssh访问我的EC2实例呢？ 我做错了什么吗？

- boomslang

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可能是SSH访问Amazon EC2实例时出现“Permission denied（publickey）”的重复问题。 - Mohd Belal

当我使用了错误的密钥文件时，发生了这种情况。 - Mr Ed

Answer 1

我通过以下步骤解决了这个问题：

1- 使用以下命令授予权限给你的ssh-key.pem:

chmod 400 ssh-key.pem

2- 使用命令ssh-keygen获取公钥并将其复制：

ssh-keygen -y -f ssh-key.pem

3- 打开AWS控制台，选择您的实例并单击连接按钮。

4- 单击EC2 Instance connect，然后单击连接按钮以打开远程终端。 5- 然后执行以下命令：

vi ~/.ssh/authorized_keys

6- 用第二步生成的本地密钥替换服务器密钥。

7- 保存文件。

8- 打开本地终端。

9- 使用此命令连接：

ssh -i ssh-key.pem ubuntu@yourIpAdress

- Houssin Boulla

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没有任何帮助。我正在使用Ubuntu用户名（而不是root），并且~/.ssh/known_hosts包含公钥。 - Lazarus Thurston

Answer 2

当您这样做时：

删除现有密钥并在EC2仪表板上创建/下载新密钥。

您不会更改现有实例上的密钥。您所做的只是创建一个新密钥，可以分配给新启动的实例。

您正在连接到实例，并且它正在响应。当您收到此错误时，意味着您要连接的用户不存在，或者您的公钥未安装在该用户的authorized_keys文件中。

- datasage

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谢谢。我能够使用原始密钥连接成功。 - boomslang

那么，如何安装它？ - Kinnard Hockenhull

@KinnardHockenhull 每个用户都有自己的authorized_keys文件，位于主目录下的.ssh文件夹中。该文件的格式非常简单，每行只需一个公钥。如果用户没有这个文件，您可以创建它，但必须授予适当的权限，只允许用户访问它。 - datasage

Answer 3

我收到了这个错误：

Permission denied (publickey,gssapi-keyex,gssapi-with-mic)。

解决方法是在公共 DNS 之前添加 ec2-user（默认用户）。

- Monde Makoko