Difference between revisions of "~/.ssh/authorized keys"

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* <code>[[touch]] ~/[[.ssh]]/authorized_keys && [[chmod]] og-r ~/.ssh/authorized_keys</code>
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* <code>[[chmod]] 600 ~/[[.ssh]]/authorized_keys or chmod ogw-r ~/.ssh/authorized_keys</code>
 +
 +
[[chown]]
 +
 
* [[Configure OpenSSH to allow Public-key authentication]]
 
* [[Configure OpenSSH to allow Public-key authentication]]
  
 +
[[sshd_config]]
 +
#[[AuthorizedKeysFile]] .ssh/authorized_keys .ssh/authorized_keys
  
<pre>
+
https://linux.die.net/man/5/sshd_config [[sshd_config]]
AUTHORIZED_KEYS FILE FORMAT
+
 
 +
AUTHORIZED_KEYS FILE FORMAT
 
     AuthorizedKeysFile specifies the files containing public keys for public key authentication; if this option is not specified, the default is ~/.ssh/authorized_keys and
 
     AuthorizedKeysFile specifies the files containing public keys for public key authentication; if this option is not specified, the default is ~/.ssh/authorized_keys and
 
     ~/.ssh/authorized_keys2.  Each line of the file contains one key (empty lines and lines starting with a ‘#’ are ignored as comments).  Public keys consist of the following
 
     ~/.ssh/authorized_keys2.  Each line of the file contains one key (empty lines and lines starting with a ‘#’ are ignored as comments).  Public keys consist of the following
     space-separated fields: options, keytype, base64-encoded key, comment.  The options field is optional.  The supported key types are:
+
     space-separated fields: options, keytype, [[base64]]-encoded key, comment.  The options field is optional.  The supported key  
 +
types are:
  
 
           [email protected]
 
           [email protected]
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           ecdsa-sha2-nistp521
 
           ecdsa-sha2-nistp521
 
           [email protected]
 
           [email protected]
           ssh-ed25519
+
           ssh-[[ed25519]]
 
           ssh-dss
 
           ssh-dss
 
           ssh-rsa
 
           ssh-rsa
  
 
     The comment field is not used for anything (but may be convenient for the user to identify the key).
 
     The comment field is not used for anything (but may be convenient for the user to identify the key).
</pre>
 
  
 
== Example files ==
 
== Example files ==
 
  [[ssh-ed25519]] AAAAC3NzaC1lZDI1NTE5AAAAIEBiBqpWXhPTH9RIo9UR3ED9xUv6O/SqpWRn16UH/gHD TEXT@TEXT
 
  [[ssh-ed25519]] AAAAC3NzaC1lZDI1NTE5AAAAIEBiBqpWXhPTH9RIo9UR3ED9xUv6O/SqpWRn16UH/gHD TEXT@TEXT
 
  [[ssh-rsa]] .../...
 
  [[ssh-rsa]] .../...
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 +
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Additional information about format key:
 +
 +
:https://serverfault.com/questions/526399/why-do-my-two-ssh-public-keys-have-the-same-beginning/526404
 +
:https://tools.ietf.org/html/rfc4253
 +
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQ...
 +
      |  "ssh-rsa"  |exponent|  modulus
 +
 +
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFKy...
 +
          |  "ssh-ed25519"  |  32 byte public key
 +
 +
== Errors ==
 +
 +
[[sshd logs]]
 +
Apr 26 11:45:37 ip-10-10-10-10.eu-west-1.compute.internal sshd[18174]: Authentication refused: [[bad ownership or modes for file]] /home/your_user/.ssh/authorized_keys
 +
 +
== Related terms ==
 +
* [[sftp configuration]]
 +
* <code>[[expiry-time]]</code> in [[OpenSSH 7.7]] ([[2018]])
 +
* <code>[[ssh-import-id]]</code>
 +
* [[AuthenticationMethods]]
 +
* <code>[[visudo]]</code>
  
 
== See also ==
 
== See also ==

Latest revision as of 14:56, 11 September 2023

  • touch ~/.ssh/authorized_keys && chmod og-r ~/.ssh/authorized_keys
  • chmod 600 ~/.ssh/authorized_keys or chmod ogw-r ~/.ssh/authorized_keys
chown 

sshd_config

#AuthorizedKeysFile	.ssh/authorized_keys .ssh/authorized_keys

https://linux.die.net/man/5/sshd_config sshd_config

AUTHORIZED_KEYS FILE FORMAT
    AuthorizedKeysFile specifies the files containing public keys for public key authentication; if this option is not specified, the default is ~/.ssh/authorized_keys and
    ~/.ssh/authorized_keys2.  Each line of the file contains one key (empty lines and lines starting with a ‘#’ are ignored as comments).  Public keys consist of the following
    space-separated fields: options, keytype, base64-encoded key, comment.  The options field is optional.  The supported key 
types are:
          [email protected]
          ecdsa-sha2-nistp256
          ecdsa-sha2-nistp384
          ecdsa-sha2-nistp521
          [email protected]
          ssh-ed25519
          ssh-dss
          ssh-rsa
    The comment field is not used for anything (but may be convenient for the user to identify the key).

Example files[edit]

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEBiBqpWXhPTH9RIo9UR3ED9xUv6O/SqpWRn16UH/gHD TEXT@TEXT
ssh-rsa .../...


Additional information about format key:

https://serverfault.com/questions/526399/why-do-my-two-ssh-public-keys-have-the-same-beginning/526404
https://tools.ietf.org/html/rfc4253
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQ...
      |  "ssh-rsa"   |exponent|   modulus
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFKy...
          |   "ssh-ed25519"   |   32 byte public key

Errors[edit]

sshd logs

Apr 26 11:45:37 ip-10-10-10-10.eu-west-1.compute.internal sshd[18174]: Authentication refused: bad ownership or modes for file /home/your_user/.ssh/authorized_keys

Related terms[edit]

See also[edit]

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