ssh "permissions are too open"

The keys need to be read-writable only by you:

chmod 600 ~/.ssh/id_rsa

Alternatively, the keys can be only readable by you (this also blocks your write access):

chmod 400 ~/.ssh/id_rsa

600 appears to be better in most cases, because you don't need to change file permissions later to edit it. (See the comments for more nuances)

The relevant portion from the manpage (man ssh)

 ~/.ssh/id_rsa
         Contains the private key for authentication.  These files contain sensitive 
         data and should be readable by the user but not
         accessible by others (read/write/execute).  ssh will simply ignore a private 
         key file if it is              
         accessible by others.  It is possible to specify a
         passphrase when generating the key which will be used to encrypt the sensitive 
         part of this file using 3DES.

 ~/.ssh/identity.pub
 ~/.ssh/id_dsa.pub
 ~/.ssh/id_ecdsa.pub
 ~/.ssh/id_rsa.pub
         Contains the public key for authentication.  These files are not sensitive and 
         can (but need not) be readable by anyone.

Using Cygwin in Windows 8.1, there is a command need to be run:

chgrp Users ~/.ssh/id_rsa

Then the solution posted here can be applied, 400 or 600 is OK.

chmod 600 ~/.ssh/id_rsa

Reference here

I've got the error in my windows 10 so I set permission as the following and it works.

In details, remove other users/groups until it has only 'SYSTEM' and 'Administrators'. Then add your windows login into it with Read permission only.

Note the id_rsa file is under the c:\users\<username> folder.

The locale-independent solution that works on Windows 8.1 is:

chgrp 545 ~/.ssh/id_rsa
chmod 600 ~/.ssh/id_rsa

GID 545 is a special ID that always refers to the 'Users' group, even if you locale uses a different word for Users.

Windows 10 ssh into Ubuntu EC2 “permissions are too open” error on AWS

I had this issue trying to ssh into an Ubuntu EC2 instance using the .pem file from AWS.

In windows this worked when I put this key in a folder created under the .ssh folder

C:\Users\USERNAME\.ssh\private_key

To change permission settings in Windows 10 :

File Settings > Security > Advanced

Disable inheritance

Convert Inherited Permissions Into Explicit Permissions

Remove all the permission entries except for Administrators

Could then connect securely.

AFAIK the values are:

• 700 for the hidden directory .ssh where key files are located

• 600 for the keyfile id_rsa

0600 is what mine is set at (and it's working)

I have got a similar issue when i was trying to login to remote ftp server using public keys.
To solve this issue I have done the following process:

• First find the location of the public keys, because when you try to login to ftp, this public key is used.
• Alternatively, you can create a key and set that key's permissions to 600.
• Make sure you are in the correct location and perform this command:

chmod 600 id_rsa

On Windows 10, cygwin's chmod and chgrp weren't enough for me. I had to

• right click on the file
• -> Properties
• -> Security (tab)
• and remove all users and groups except for my active user.

I got success with sudo

sudo chmod 400 pem-file.pem
sudo ssh -i pem-file.pem username@X.X.X.X

provide 400 permission, execute below command

chmod 400 /Users/username/.ssh/id_rsa

There is one exception to the 0x00 permissions requirement on a key. If the key is owned by root and group-owned by a group with users in it, then it can be 0440 and any user in that group can use the key.

I believe this will work with any permissions in the set 0xx0 but I haven't tested every combination with every version. I have tried 0660 with 5.3p1-84 on CentOS 6, and the group not the primary group of the user but a secondary group, and it works fine.

This would typically not be done for someone's personal key, but for a key used for automation, in a situation where you don't want the application to be able to mess with the key.

Similar rules apply to the .ssh directory restrictions.

For windows users Only. Goto file property --> security --> advanced

1. Disable inheritance property
2. Convert Inherited Permissions Into Explicit Permissions.
3. Remove all the permission entries except the Administrators.

This is what worked for me (on mac)

sudo chmod 600 path_to_your_key.pem 

then :

ssh -i path_to_your_key user@server_ip

Hope it help

In case you are using WSL on windows

The most simple answer is to just type: sudo ssh -i keyfile.pem <user>@ip

without changing the file permissions. The reason why this happens? Another resource

You can't modify the permissions of files on Windows's filesystem using chmod on Bash on Ubuntu on Windows. You'll have to copy the private key to your WSL home directory (~) and do it there.

On the other hand, sudo should never be utilized with ssh. The reason why issuing with sudo works is that it's now likely being executed as root, and this is not the correct way to do this and is a massive security risk, as Allowing for anything other the 600/400 permissions defeats the purpose of utilizing an SSH key, compromising the security of the key.

The best way to do that is by copying the file to $HOME/.ssh:

cp keyfile.pem ~/.ssh

Doing sudo chmod 400 keyfile.pem to it.

Then ssh -i keyfile.pem <user>@ip.

I got same issue after migration from another mac. And it blocked to connect github by my key.

I reset permission as below and it works well now.

chmod 700 ~/.ssh     # (drwx------)
cd ~/.ssh            
chmod 644 *.pub      # (-rw-r--r--)
chmod 600 id_rsa     # (-rw-------)

For me (using the Ubuntu Subsystem for Windows) the error message changed to:

 Permissions 0555 for 'key.pem' are too open

after using chmod 400. It turns out that using root as a default user was the reason.

Change this using the cmd:

 ubuntu config --default-user your_username

for Windows :

Strange, but UI tweaks, described here before did not helped me.

But this solved the issue :

1. Open PowerShell under admin rights
2. Go to directory with your keys (using cd command)
3. Enter commands one by one

:

$path = ".\{your private key file name}" //for example "myKey"

Then remove your explicit permissions by typing:

icacls.exe $path /reset

Then assign to current user read-permission:

icacls.exe $path /GRANT:R "$($env:USERNAME):(R)"

Then remove inheritance:

icacls.exe $path /inheritance:r

Hope, will help someone

Simply use the following:

sudo chmod 600 [Location of Private Key]/[Name of Private Key]
sudo chmod 700 [Location of Folder Containing Private Key]/[Name of Folder Conataining Private Key]
sudo ssh -v -i key.pem ubuntu@instance.re-region-1.compute.amazonaws.com

what worked for me

chgrp Users FOLDER

chmod 600 FOLDER

700  folder
644  id_rsa.pub

this works for me.

As people have said, in Windows, I just dropped my .pem file in C:\Users\[user]\.ssh\ and that solved it. Although you can do chmod and other command line options from a bash or powershell prompt that didn't work. I didn't change rsa or anything else. Then when running the connection you have to put the path to the pem file in the .ssh folder:

ssh -i "C:\Users\[user]\.ssh\ubuntukp01.pem" ubuntu@ec[ipaddress].us-west-2.compute.amazonaws.com

I keep all my own certificates and keys in one directory, and this works for tools like PuTTY, but I got this too open error message from the scp command. I discovered that Windows already maintains a C:\users\ACCOUNTNAME\.ssh folder having the proper access rights for storing SSH keys. So long as you keep the contents backed up (Windows sometimes deletes it during updates), or create your own folder for ssh keys in your user folder, this will work fine, as only you and the administrators have access to that parent folder.

Be very careful about changing access rights on Windows folders. I did this, and once a day Windows is scanning, reading, and writing all the files on my C: drive, a process that slows the computer for many minutes.

Interesting message here. Operating Systems are smart enough to deny remote connections if your private key is too open. It understands the risk where permissions for id_rsa is wide open (read, is editable by anyone).

{One may change your lock first and then open it with the keys he already has}

cd ~/.ssh
chmod 400 id_rsa

While working on the multiple servers (non-production), most of us feel need to connect remote server with ssh. A good idea is to have a piece of application level code (may be java using jsch) to create ssh trusts between servers. This way connection will be password-less. Incase, perl is installed - one may use net ssh module too.

The other trick is to do that on the downloads folder. After you download the private key from AWS EC2 instance, the file will be in this folder,then simply type the command

ssh-keygen -y -f myprivateKey.pem > mypublicKey.pub

I am using Windows 10 and trying to connect to EC2 instance via SSH. Rather than using Cygwin for Windows, try using Git Bash. After doing chmod 400 for key I am able to SSH into the EC2 instance, but the same is not working for me from Cygwin. Windows treats the .pem file as coming from internet and blocks it, even disabling inheritance doesn't work.

I converted the file to .ppk format and it's working fine from PuTTY also, but it's not working from Cygwin.

In addition to the accepted answer, if you have done all the suggested means, and you are using "wsl" ubuntu on windows, you can append "sudo" to your ssh command e.g

sudo ssh -i xxx.pem xxxx@xxxx.compute-1.amazonaws.com

For Windows 10 this is what I've found works for me:

1. Move your key to the Linux file system: mv ~/.ssh /home/{username}
2. Set the permission on that key: chmod 700 /home/{username}/.ssh/id_rsa
3. Create a symbolic link to the key: ln -s /home/{username}/.ssh ~/.ssh

This happens if you have set your home directory (~) to be stored in Windows instead of Linux (under /mnt/ vs /home/).

In my case the issue was a whitespace too much.

ssh -i mykey.pem  ubuntu@instace.eu-north-1.compute.amazonaws.com

but

ssh -i mykey.pem ubuntu@instace.eu-north-1.compute.amazonaws.com

worked fine. The problem is that the whitespace is taken as part of the username.

I was getting this issue on WSL on Windows while connecting to AWS instance. My issue got resolved by switching to classic Command prompt. You can try switching to a different terminal interface and see if that helps.