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Restrict Access to SSH server based on incoming key type


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I am running ubuntu 18.04.3 server HWE edition in my local lab and while reading the manuals I came across the issue that I am unable to determine how to exclude users from connecting to my server via ssh which do not use a key created using the ed25519 algorithm.



I know that I can configure sshd to deny specific ciphers, but I can not find information about restricting the usage of keys with specific algorithms.



I made it sofar that I basically deleted all host keys which are not ed25519 and restricted the renewal to only ed25519, but this obviously will not achieve what I want userside.



Thanks in advance.










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    I am running ubuntu 18.04.3 server HWE edition in my local lab and while reading the manuals I came across the issue that I am unable to determine how to exclude users from connecting to my server via ssh which do not use a key created using the ed25519 algorithm.



    I know that I can configure sshd to deny specific ciphers, but I can not find information about restricting the usage of keys with specific algorithms.



    I made it sofar that I basically deleted all host keys which are not ed25519 and restricted the renewal to only ed25519, but this obviously will not achieve what I want userside.



    Thanks in advance.










    share|improve this question







    New contributor



    Seemax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.
























      0












      0








      0








      I am running ubuntu 18.04.3 server HWE edition in my local lab and while reading the manuals I came across the issue that I am unable to determine how to exclude users from connecting to my server via ssh which do not use a key created using the ed25519 algorithm.



      I know that I can configure sshd to deny specific ciphers, but I can not find information about restricting the usage of keys with specific algorithms.



      I made it sofar that I basically deleted all host keys which are not ed25519 and restricted the renewal to only ed25519, but this obviously will not achieve what I want userside.



      Thanks in advance.










      share|improve this question







      New contributor



      Seemax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I am running ubuntu 18.04.3 server HWE edition in my local lab and while reading the manuals I came across the issue that I am unable to determine how to exclude users from connecting to my server via ssh which do not use a key created using the ed25519 algorithm.



      I know that I can configure sshd to deny specific ciphers, but I can not find information about restricting the usage of keys with specific algorithms.



      I made it sofar that I basically deleted all host keys which are not ed25519 and restricted the renewal to only ed25519, but this obviously will not achieve what I want userside.



      Thanks in advance.







      ubuntu sshd algorithms






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      Seemax is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked 38 mins ago









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