Each user on the server has their own authorized_keys file, so by adding a public key to one user, you allow someone with the corresponding private key to log in, as that user.
Can authorized_keys have multiple keys?
It’s perfectly acceptable to have more than one key in an authorized_keys file.
What is AuthorizedKeysFile?
The AuthorizedKeysFile keyword specifies the file containing public keys for public key authentication. If none is specified, the default is ~/. ssh/authorized_keys and ~/. ssh. Each line of the file contains one key specification (empty lines and lines starting with # are ignored as comments).
What permissions should authorized_keys have?
The authorized_keys file should have 644 permissions and be owned by the user. The next time you connect with SSH you should not have to enter your password.
Do I need more than 1 SSH key?
As far as security is concerned, you don’t compromise your key in any way by using it to log in on a machine (as you would by using a password), so having separate keys for separate destinations doesn’t make you any more safe from an authentication/security perspective.
What is the difference between Authorized_keys and authorized_keys2?
ssh/authorized_keys file lists the RSA keys that are permitted for RSA authentication in SSH protocols 1.3 and 1.5 Similarly, the $HOME/. ssh/authorized_keys2 file lists the DSA and RSA keys that are permitted for public key authentication (PubkeyAuthentication) in SSH protocol 2.0.
What is Known_hosts file in Linux?
known_hosts. This is a very important file for SSH. The ~/. ssh/known_hosts file contains the SSH fingerprints of machines you’ve logged into. These fingerprints are generated from the remote server’s SSH key.
What is the difference between authorized_keys and authorized_keys2?
Can I delete known_hosts file?
Windows with PuTTY Search for regedit.exe and open it. Navigate to HKEY_CURRENT_USER/SOFTWARE/SimonTatham/PuTTy/SshHostKeys. Right click the offending key and click delete.
What permissions should be .ssh folder?
ssh directory permissions should be 700 (drwx——). The public key (. pub file) should be 644 (-rw-r–r–). The private key (id_rsa) on the client host, and the authorized_keys file on the server, should be 600 (-rw——-).
What is the difference between Known_hosts and authorized_keys?
The known_hosts file lets the client authenticate the server, to check that it isn’t connecting to an impersonator. The authorized_keys file lets the server authenticate the user.
What is the authorizedkeysfile keyword?
The AuthorizedKeysFile keyword specifies the file containing public keys for public key authentication . The file contains a list of public keys, one per line.
What is the difference between authorizedkeysfile and speckeysfile?
Specifies the file that contains the public keys that can be used for user authentication. AuthorizedKeysFile may contain tokens of the form %T which are substituted during connection setup.
What is an authorized key in SSH?
In a PKI model, once an SSH server receives a public key from a user and considers the key trustworthy, the server marks the key as authorized in its authorized_keys file. Such keys are called authorized keys . The AuthorizedKeysFile keyword specifies the file containing public keys for public key authentication .
What is %T token in authorizationauthorizedkeysfile?
AuthorizedKeysFile may contain tokens of the form %T which are substituted during connection setup. The following tokens are defined: %% is replaced by a literal ‘%’, %h is replaced by the home directory of the user being authenticated, and %u is replaced by the username of that user.
