我有一台 Macbook pro，并且我成功设置了授权密钥，这样我就不必每次登录远程计算机时都输入密码。
几年后，我有了一台安装了 Ubuntu 的新电脑。我现在正在尝试做同样的事情，但我遇到了问题。
到目前为止，我已经运行ssh-keygen -t dsa并将文件夹的权限更改~/.ssh为 700，将id_dsa*文件的权限更改为 600
我已经更新了authorised_keys远程计算机上的文件，现在它看起来像：
ssh-rsa KEYFORTHEOLDMACHINEWHICHISTILLUSE
ssh-dss KEYFORTHENEWMACHINE
我在两者之间有一个空间。我不知道这是否重要，但我尝试过在它们之间没有空格和换行符。
我已确保我的服务器上的权限也如上所述。
但当我ssh进去时，仍然提示我输入密码。有什么明显的事情表明我做错了吗？
更新：
当我运行时ls -ld ~/ ~/.ssh ~/.ssh/authorized_keys，我得到以下信息：
drwxr-xr-x 5 myusername domain users 4096 Jun 8 20:58 /home/myusername/
drwx------ 2 myusername domain users 4096 Jun 8 18:06 /home/myusername/.ssh
-rw------- 1 myusername subdept-phys-sags 1044 Jun 8 18:06 /home/myusername/.ssh/authorized_keys
更新：
当我运行时ssh -vv remote_server，我得到以下信息：
OpenSSH_7.2p2 Ubuntu-4, OpenSSL 1.0.2g-fips 1 Mar 2016
debug1: Reading configuration data /home/jg/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "ssh-gateway.physics.ac.uk" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to ssh-gateway.physics.ac.uk [163.1.240.41] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_rsa-cert type -1
debug1: identity file /home/jg/.ssh/id_dsa type 2
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/jg/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.7
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.7 pat OpenSSH_6.6.1* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to ssh-gateway.physics.ac.uk:22 as 'brook'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: [email protected],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: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:Ay2gqDucgtHyDl2rDdBifYSewyrqz1Tu9PZYU4FTeLU
debug1: Host 'ssh-gateway.physics.ac.uk' is known and matches the ECDSA host key.
debug1: Found key in /home/jg/.ssh/known_hosts:1
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS received
debug1: Skipping ssh-dss key /home/jg/.ssh/id_dsa - not in PubkeyAcceptedKeyTypes
debug2: key: /home/jg/.ssh/id_rsa ((nil))
debug2: key: /home/jg/.ssh/id_ecdsa ((nil))
debug2: key: /home/jg/.ssh/id_ed25519 ((nil))
debug2: service_accept: ssh-userauth
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
debug2: we did not send a packet, disable method
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available
debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available
debug1: Unspecified GSS failure. Minor code may provide more information
debug1: Unspecified GSS failure. Minor code may provide more information No Kerberos credentials available
debug2: we did not send a packet, disable method
debug1: Next authentication method: publickey
debug1: Trying private key: /home/jg/.ssh/id_rsa
debug1: Trying private key: /home/jg/.ssh/id_ecdsa
debug1: Trying private key: /home/jg/.ssh/id_ed25519
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
答案1
注意重要的一行：
debug1：跳过 ssh-dss 密钥 /home/jg/.ssh/id_dsa - 不在 PubkeyAcceptedKeyTypes 中
从http://www.openssh.com/txt/release-7.0
- ssh(1)、sshd(8)：扩展 Ciphers、MAC、KexAlgorithms、HostKeyAlgorithms、PubkeyAcceptedKeyTypes 和 HostbasedKeyTypes 选项，以允许附加到默认算法集而不是替换它。选项现在可以以“+”为前缀以附加到默认值，例如“HostKeyAlgorithms=+ssh-dss”。
尝试将以下内容添加到/etc/ssh/ssh_config或~/.ssh/config
PubkeyAcceptedKeyTypes +ssh-dss
注意：除了使用 RSA 生成新密钥并完全跳过此问题（一个简单的ssh-keygen应该就足够了）之外，我还想还建议使用ssh-copy-id而不是手动进行密钥复制。