1SSS_SSH_AUTHORIZEDKE(1) SSSD Manual pages SSS_SSH_AUTHORIZEDKE(1)
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6 sss_ssh_authorizedkeys - get OpenSSH authorized keys
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9 sss_ssh_authorizedkeys [options] USER
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12 sss_ssh_authorizedkeys acquires SSH public keys for user USER and
13 outputs them in OpenSSH authorized_keys format (see the
14 “AUTHORIZED_KEYS FILE FORMAT” section of sshd(8) for more information).
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16 sshd(8) can be configured to use sss_ssh_authorizedkeys for public key
17 user authentication if it is compiled with support for
18 “AuthorizedKeysCommand” option. Please refer to the sshd_config(5) man
19 page for more details about this option.
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21 If “AuthorizedKeysCommand” is supported, sshd(8) can be configured to
22 use it by putting the following directives in sshd_config(5):
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24 AuthorizedKeysCommand /usr/bin/sss_ssh_authorizedkeys
25 AuthorizedKeysCommandUser nobody
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28 KEYS FROM CERTIFICATES
29 In addition to the public SSH keys for user USER sss_ssh_authorizedkeys
30 can return public SSH keys derived from the public key of a X.509
31 certificate as well.
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33 To enable this the “ssh_use_certificate_keys” option must be set to
34 true (default) in the [ssh] section of sssd.conf. If the user entry
35 contains certificates (see “ldap_user_certificate” in sssd-ldap(5) for
36 details) or there is a certificate in an override entry for the user
37 (see sss_override(8) or sssd-ipa(5) for details) and the certificate is
38 valid SSSD will extract the public key from the certificate and convert
39 it into the format expected by sshd.
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41 Besides “ssh_use_certificate_keys” the options
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43 · ca_db
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45 · p11_child_timeout
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47 · certificate_verification
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49 can be used to control how the certificates are validated (see
50 sssd.conf(5) for details).
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52 The validation is the benefit of using X.509 certificates instead of
53 SSH keys directly because e.g. it gives a better control of the
54 lifetime of the keys. When the ssh client is configured to use the
55 private keys from a Smartcard with the help of a PKCS#11 shared library
56 (see ssh(1) for details) it might be irritating that authentication is
57 still working even if the related X.509 certificate on the Smartcard is
58 already expired because neither ssh nor sshd will look at the
59 certificate at all.
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61 It has to be noted that the derived public SSH key can still be added
62 to the authorized_keys file of the user to bypass the certificate
63 validation if the sshd configuration permits this.
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66 -d,--domain DOMAIN
67 Search for user public keys in SSSD domain DOMAIN.
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69 -?,--help
70 Display help message and exit.
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73 In case of success, an exit value of 0 is returned. Otherwise, 1 is
74 returned.
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77 sssd(8), sssd.conf(5), sssd-ldap(5), sssd-krb5(5), sssd-simple(5),
78 sssd-ipa(5), sssd-ad(5), sssd-sudo(5), sssd-session-recording(5),
79 sss_cache(8), sss_debuglevel(8), sss_obfuscate(8), sss_seed(8),
80 sssd_krb5_locator_plugin(8), sss_ssh_authorizedkeys(8),
81 sss_ssh_knownhostsproxy(8), sssd-ifp(5), pam_sss(8). sss_rpcidmapd(5)
82 sssd-systemtap(5)
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85 The SSSD upstream - https://pagure.io/SSSD/sssd/
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89SSSD 07/01/2019 SSS_SSH_AUTHORIZEDKE(1)