Where is authorized keys2

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Change base. Conversation 3 Commits 2 Checks 0 Files changed. In OpenSSH, a user's authorized keys file lists keys that are authorized for authenticating as that user, one per line.

Lines starting with and empty lines are ignored. Each line contains a public SSH key. The public key may be preceded by options that control what can be done with the key. Indicates that the key should be trusted as a certificate authority to validate proprietary OpenSSH certificates for authenticating as that user.

We strongly recommend against using this option , as using OpenSSH certificates for user authentication makes it impossible to audit who has access to the server by inspecting server configuration files, and no trustworthy OpenSSH certificate authority exists.

Forces a command to be executed when this key is used for authentication. This is also called command restriction or forced command. The effect is to limit the privileges given to the key, and specifying this options is often important for implementing the principle of least privilege.

Without this option, the key grants unlimited access as that user, including obtaining shell access. It is a common error when configuring SFTP file transfers to accidentally omit this option and permit shell access. Specifies an environment variable and its value to be added to the environment before executing shell or command. Specifies a source restriction or from-stanza , restricting the set of IP addresses or host names from which the reverse-mapped DNS names from which the key can be used.

Dennis Williamson Dennis Williamson If only someone would tell redhat that DennisWilliamson Right.. Show 1 more comment. Originally the difference was for version differentiation. But don't bother any more, as now the 2 can be ignored. IQAndreas 1, 2 2 gold badges 15 15 silver badges 37 37 bronze badges. It becomes especially important when shared homes are used as they generally are on a cluster. It is a real shame it is now depreciated. I did not know you can list multiple files in that option.

Especially as the first words in the manpage for it was Specifies the file that Singular file rather than plural files. But that was clarified later. Thanks again. The Overflow Blog.