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ssh-keysign (1)
  • >> ssh-keysign (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • ssh-keysign (8) ( FreeBSD man: Команды системного администрирования )
  • ssh-keysign (8) ( Русские man: Команды системного администрирования )
  • ssh-keysign (8) ( Linux man: Команды системного администрирования )
  •  

    NAME

    ssh-keysign - ssh helper program for host-based authentication
     
    

    SYNOPSIS

    ssh-keysign 
    

     

    DESCRIPTION

    ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with SSH protocol version 2. This signature is of data that includes, among other items, the name of the client host and the name of the client user.

    ssh-keysign is disabled by default and can be enabled only in the global client configuration file /etc/ssh/ssh_config by setting HostbasedAuthentication to yes.

    ssh-keysign is not intended to be invoked by the user, but from ssh. See ssh(1) and sshd(1M) for more information about host-based authentication.  

    FILES

    /etc/ssh/ssh_config

    Controls whether ssh-keysign is enabled.

    /etc/ssh/ssh_host_dsa_key
    /etc/ssh/ssh_host_rsa_key

    These files contain the private parts of the host keys used to generate the digital signature. They should be owned by root, readable only by root, and not accessible to others. Because they are readable only by root, ssh-keysign must be set-uid root if host-based authentication is used.

     

    SECURITY

    ssh-keysign will not sign host-based authentication data under the following conditions:

    o If the HostbasedAuthentication client configuration parameter is not set to yes in /etc/ssh/ssh_config. This setting cannot be overriden in users' ~/.ssh/ssh_config files.
    o If the client hostname and username in /etc/ssh/ssh_config do not match the canonical hostname of the client where ssh-keysign is invoked and the name of the user invoking ssh-keysign.

    In spite of ssh-keysign's restrictions on the contents of the host-based authentication data, there remains the ability of users to use it as an avenue for obtaining the client's private host keys. For this reason host-based authentication is turned off by default.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWsshu

    Interface Stability

     

    SEE ALSO

    ssh(1), sshd(1M), ssh_config(4), attributes(5)  

    AUTHORS

    Markus Friedl, markus@openbsd.org  

    HISTORY

    ssh-keysign first appeared in Ox 3.2.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FILES
    SECURITY
    ATTRIBUTES
    SEE ALSO
    AUTHORS
    HISTORY


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