NAME

       sss_ssh_authorizedkeys - get OpenSSH authorized keys

SYNOPSIS

       sss_ssh_authorizedkeys [options] USER

DESCRIPTION

       sss_ssh_authorizedkeys acquires SSH public keys for user USER and outputs them in OpenSSH
       authorized_keys format (see the “AUTHORIZED_KEYS FILE FORMAT” section of sshd(8) for more
       information).

       sshd(8) can be configured to use sss_ssh_authorizedkeys for public key user authentication
       if it is compiled with support for “AuthorizedKeysCommand” option. Please refer to the
       sshd_config(5) man page for more details about this option.

       If “AuthorizedKeysCommand” is supported, sshd(8) can be configured to use it by putting
       the following directives in sshd_config(5):

             AuthorizedKeysCommand /usr/bin/sss_ssh_authorizedkeys
             AuthorizedKeysCommandUser nobody

   KEYS FROM CERTIFICATES
       In addition to the public SSH keys for user USER sss_ssh_authorizedkeys can return public
       SSH keys derived from the public key of a X.509 certificate as well.

       To enable this the “ssh_use_certificate_keys” option must be set to true (default) in the
       [ssh] section of sssd.conf. If the user entry contains certificates (see
       “ldap_user_certificate” in sssd-ldap(5) for details) or there is a certificate in an
       override entry for the user (see sss_override(8) or sssd-ipa(5) for details) and the
       certificate is valid SSSD will extract the public key from the certificate and convert it
       into the format expected by sshd.

       Besides “ssh_use_certificate_keys” the options

       •   ca_db

       •   p11_child_timeout

       •   certificate_verification

       can be used to control how the certificates are validated (see sssd.conf(5) for details).

       The validation is the benefit of using X.509 certificates instead of SSH keys directly
       because e.g. it gives a better control of the lifetime of the keys. When the ssh client is
       configured to use the private keys from a Smartcard with the help of a PKCS#11 shared
       library (see ssh(1) for details) it might be irritating that authentication is still
       working even if the related X.509 certificate on the Smartcard is already expired because
       neither ssh nor sshd will look at the certificate at all.

       It has to be noted that the derived public SSH key can still be added to the
       authorized_keys file of the user to bypass the certificate validation if the sshd
       configuration permits this.

OPTIONS

       -d,--domain DOMAIN
           Search for user public keys in SSSD domain DOMAIN.

       -?,--help
           Display help message and exit.

EXIT STATUS

       In case of success, an exit value of 0 is returned. Otherwise, 1 is returned.

SEE ALSO

       sssd(8), sssd.conf(5), sssd-ldap(5), sssd-krb5(5), sssd-simple(5), sssd-ipa(5), sssd-
       ad(5), sssd-files(5), sssd-sudo(5), sssd-session-recording(5), sss_cache(8),
       sss_debuglevel(8), sss_obfuscate(8), sss_seed(8), sssd_krb5_locator_plugin(8),
       sss_ssh_authorizedkeys(8), sss_ssh_knownhostsproxy(8), sssd-ifp(5), pam_sss(8).
       sss_rpcidmapd(5) sssd-systemtap(5)

AUTHORS

       The SSSD upstream - https://github.com/SSSD/sssd/