sshpermissionskey

SSH Key: “Permissions 0644 for 'id_rsa.pub' are too open.” on mac

I generate a ssh key pair on my mac and add the public key to my ubuntu server(in fact, it is a virtual machine on my mac),but when I try to login the ubuntu server,it says:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 for '/Users/tudouya/.ssh/vm/vm_id_rsa.pub' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: /Users/tudouya/.ssh/vm/vm_id_rsa.pub
Permission denied (publickey,password).

I have tried many ways to solve this, change the key file mode, change the folder mode,as some answer on stackoverflow,but it doesn't work.
the key file permission:

vm dir:
drwxr-xr-x   4 tudouya  staff    136  4 29 10:37 vm

key file:
-rw-------  1 tudouya  staff  1679  4 29 10:30 vm_id_rsa
-rw-r--r--  1 tudouya  staff   391  4 29 10:30 vm_id_rsa.pub

please give me some idea... =========================================

I write the host infomation to ssh_config:

Host ubuntuvm
    Hostname 10.211.55.17
    PreferredAuthentications publickey
    IdentityFile /Users/tudouya/.ssh/vm/vm_id_rsa.pub

I run command "ssh -v ubuntuvm",it displays:

ssh -v ubuntuvm
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: /etc/ssh_config line 103: Applying options for *
debug1: /etc/ssh_config line 175: Applying options for ubuntuvm
debug1: Connecting to 10.211.55.17 [10.211.55.17] port 22.
debug1: Connection established.
debug1: identity file /Users/tudouya/.ssh/vm/vm_id_rsa.pub type 1
debug1: identity file /Users/tudouya/.ssh/vm/vm_id_rsa.pub-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-8
debug1: match: OpenSSH_6.6.1p1 Ubuntu-8 pat OpenSSH*
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com 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 55:6d:4f:0f:23:51:ac:8e:70:01:ec:0e:62:9e:1c:10
debug1: Host '10.211.55.17' is known and matches the RSA host key.
debug1: Found key in /Users/tudouya/.ssh/known_hosts:54
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,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/tudouya/.ssh/vm/vm_id_rsa.pub
debug1: Server accepts key: pkalg ssh-rsa blen 279
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 for '/Users/tudouya/.ssh/vm/vm_id_rsa.pub' are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: /Users/tudouya/.ssh/vm/vm_id_rsa.pub
debug1: No more authentication methods to try.
Permission denied (publickey,password).
Solution 
  • debug1: identity file /Users/tudouya/.ssh/vm/vm_id_rsa.pub type 1

    It appears that you're trying to use the wrong key file. The file with the ".pub" extension contains the public portion of the key. The corresponding file without the ".pub" extension contains the private part of the key. When you run an ssh client to connect to a remote server, you have to provide the private key file to the ssh client.

    You probably have a line in the your .ssh/config file (or /etc/ssh_config) which looks like this:

    IdentityFile .../.ssh/vm/vm_id_rsa.pub

    You need to remove the ".pub" extension from the filename:

    IdentityFile .../.ssh/vm/vm_id_rsa