ssh keygen后登陆无效解决 – Linux操作系统：Ubuntu_Centos_Debian – 红黑联盟

设置无密码登陆,结果出错无效.

ssh-keygen,

错误的设置方式:

登陆到远程主机:mkdir .ssh && chmod 700 .ssh

本地:scp .ssh/id_rsa.pub root@your_remote_host

结果登陆还是提示要求输入密码…. ++ 试了好多次,权限啥的都是完全正确的…就是不行…
centos远程执行:restorecon .ssh .ssh/authorized_keys

最后一步是成功的保证

后来发现,正确的设置方式:

登陆到远程主机:mkdir .ssh && chmod 700 .ssh

本地:ssh-copy-id -i .ssh/id_rsa.pub root@your_remote_host

ok成功了~~

错误的设置时,ssh显示调试信息:ssh -vvv -oPreferredAuthentications=publickey root@your_remote_host

错误的调试信息如下,供参考:

引用

OpenSSH_5.2p1, OpenSSL 1.0.1c 10 May 2012

debug1: Reading configuration data /usr/local/etc/ssh_config

debug2: ssh_connect: needpriv 0

debug1: Connecting to 192.168.0.113 [192.168.0.113] port 22.

debug1: Connection established.

debug1: identity file ~/.ssh/identity type -1

debug3: Not a RSA1 key file /home/gototouch/.ssh/id_rsa.

debug2: key_type_from_name: unknown key type ‘—–BEGIN’

debug3: key_read: missing keytype

debug3: key_read: missing whitespace

debug2: key_type_from_name: unknown key type ‘—–END’

debug3: key_read: missing keytype

debug1: identity file ~/.ssh/id_rsa type 1

debug1: identity file ~/.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_5.2

debug2: fd 3 setting O_NONBLOCK

debug1: SSH2_MSG_KEXINIT sent

debug1: SSH2_MSG_KEXINIT received

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,rijndael-cbc@lysator.liu.se

debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96

debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib

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,rijndael-cbc@lysator.liu.se

debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96

debug2: kex_parse_kexinit: none,zlib@openssh.com

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: 121/256

debug2: bits set: 499/1024

debug1: SSH2_MSG_KEX_DH_GEX_INIT sent

debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY

debug3: check_host_in_hostfile: filename /home/gototouch/.ssh/known_hosts

debug3: check_host_in_hostfile: match line 6

debug1: Host ‘192.168.0.113’ is known and matches the RSA host key.

debug1: Found key in ~/.ssh/known_hosts:6

debug2: bits set: 522/1024

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: SSH2_MSG_SERVICE_REQUEST sent

debug2: service_accept: ssh-userauth

debug1: SSH2_MSG_SERVICE_ACCEPT received

debug2: key: ~/.ssh/id_rsa (0x15fce10)

debug2: key: ubuntuhost@gmail.com (0x1604210)

debug2: key: ~/.ssh/identity ((nil))

debug2: key: ~/.ssh/id_dsa ((nil))

debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password

debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password

debug3: preferred publickey

debug3: authmethod_lookup publickey

debug3: remaining preferred:

debug3: authmethod_is_enabled publickey

debug1: Next authentication method: publickey

debug1: Offering public key: ~/.ssh/id_rsa

debug3: send_pubkey_test

debug2: we sent a publickey packet, wait for reply

debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password

debug1: Offering public key: ubuntuhost@gmail.com

debug3: send_pubkey_test

debug2: we sent a publickey packet, wait for reply

debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password

debug1: Trying private key: ~/.ssh/identity

debug3: no such identity: ~/.ssh/identity

debug1: Trying private key: ~/.ssh/id_dsa

debug3: no such identity: ~/.ssh/id_dsa

debug2: we did not send a packet, disable method

debug1: No more authentication methods to try.

Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

后记:本人仔细看了下/usr/bin/ssh-copy-id的脚步,发现了centos的restorecon命令起的作用,测试了下如下方式也是可以有效的不用密码登陆:

远程执行:mkdir .ssh && chmod 700 .ssh

本地执行:cat ~/.ssh/id_rsa.pub | ssh root@your_host ‘cat – >> .ssh/authorized_keys’

远程执行:restorecon .ssh .ssh/authorized_keys

最后一步是成功的保证

来源URL：http://www.2cto.com/os/201307/227263.html