Certificates Stored in File
To configure the server to allow user authentication with certificates, perform the following tasks:
- Acquire the CA certificate and copy it to the server machine. You can either copy the X.509 certificate(s) as such or you can copy a PKCS #7 package including the CA certificate(s). Certificates can be extracted from a PKCS #7 package by specifying the
-7 flag with
- Certificate authentication is a part of the
publickey authentication method. Make sure that you have enabled it in the
AuthPublicKey.Cert.Required option to
yes defines that the user must authenticate with a certificate or else the authentication will fail.
- Specify the trusted CA certificate and the mapping file(s) in the
You can define several CA certificates by using several
Note that multiple
MapFile keywords are permitted per
Pki keyword. Also, if no mapping file is defined, all connections are denied even if user certificates can be verified using the defined CA certificate. The server will accept only certificates issued by defined CA(s).
- Also define the LDAP server(s) used for CRL checks in the
ssh_certd_config file. If the CA services (OCSP, CRLs) are located behind a firewall, define also the SOCKS server.
Defining the LDAP server is not necessary if the CA certificate contains a
CRL Distribution Point or an
Authority Info Access extension.
- Create the certificate user mapping file as described in Section Certificate User Mapping File.
ssh-certd as instructed in Section Restarting ssh-certd.
For more information on the configuration file options, see sshd2_config and ssh_certd_config.
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