ssh 无密码登录不成功？

[hxhazx]

我安装了cygwin，要设置一个无密码登录，
发现现在有一个问题，如果生成的是id_rsa 和 id_rsa.pub，并将id_rsa_pub导入到authorized_keys文件中时，ssh localhost就可以实现无密码登录；
但奇怪的是同样的配置，生成的是id_dsa 和 id_dsa.pub，并将id_dsa_pub导入到authorized_keys文件中时，ssh localhost就提示要输入密码才行。
同样的条件下，这是怎么回事呢？

[hxhazx]

我查看了下我的sshd端用的是SSH2，难道是2只支持rsa而SSH1只支持dsa？瞎猜的

[hxhazx]

$ ssh -vv localhost
OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_rsa-cert type -1
debug1: identity file /home/Administrator/.ssh/id_dsa type 2
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/Administrator/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.1
debug1: match: OpenSSH_7.1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to localhost:22 as 'Administrator'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: [e-mail],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
debug2: kex_parse_kexinit: [e-mail],[e-mail],[e-mail],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[e-mail],[e-mail],ssh-ed25519,ssh-rsa
debug2: kex_parse_kexinit: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail],arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: kex_parse_kexinit: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail],arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail]
debug2: kex_parse_kexinit: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1,[e-mail],[e-mail],[e-mail],[e-mail],hmac-md5,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1,[e-mail],[e-mail],[e-mail],[e-mail],hmac-md5,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: [e-mail],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
debug2: kex_parse_kexinit: ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: kex_parse_kexinit: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail]
debug2: kex_parse_kexinit: [e-mail],aes128-ctr,aes192-ctr,aes256-ctr,[e-mail],[e-mail]
debug2: kex_parse_kexinit: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: kex_parse_kexinit: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-sha1
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
debug1: kex: server->client [e-mail] <implicit> none
debug1: kex: client->server [e-mail] <implicit> none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:mCdWwIg4vSv+H3ZpKi6LZBX+DOECy851X3wGm/d9vzs
debug1: Host 'localhost' is known and matches the ECDSA host key.
debug1: Found key in /home/Administrator/.ssh/known_hosts:1
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: /home/Administrator/.ssh/id_rsa (0x0),
debug2: key: /home/Administrator/.ssh/id_dsa (0x20058108),
debug2: key: /home/Administrator/.ssh/id_ecdsa (0x0),
debug2: key: /home/Administrator/.ssh/id_ed25519 (0x0),
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /home/Administrator/.ssh/id_rsa
debug1: Skipping ssh-dss key /home/Administrator/.ssh/id_dsa for not in PubkeyAcceptedKeyTypes
debug1: Trying private key: /home/Administrator/.ssh/id_ecdsa
debug1: Trying private key: /home/Administrator/.ssh/id_ed25519
debug2: we did not send a packet, disable method
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
Administrator@localhost's password:

[hxhazx]

没有人愿意指点一下吗

[hroapye]

正好碰到这个问题。 具体原因如下： OpenSSH 7 默认不允许用DSA的公钥，在配置里加上

PubkeyAcceptedKeyTypes +ssh-dss

可以打开限制。