.. _caconnectors: CA Connectors ------------- .. index:: caconnectors, CA, Certificate Authority, certificate token You can use eduMFA to enroll certificates and assign certificates to users. You can define connections to Certificate Authorities, that are used when enrolling certificates. .. _fig_caconnector: .. figure:: images/CA-connectors.png :width: 500 *A local CA definition* When you enroll a Token of type *certificate* the Certificate Signing Request gets signed by one of the CAs attached to eduMFA by the CA connectors. The first CA connector that ships with eduMFA is a connector to a local openSSL based Certificate Authority as shown in figure :ref:`fig_caconnector`. When enrolling a certificate token you can choose, which CA should sign the certificate request. .. figure:: images/enroll-cert.png :width: 500 *Enrolling a certificate token* .. _local_caconnector: Local CA Connector ~~~~~~~~~~~~~~~~~~ .. index:: openssl The local CA connector calls a local openSSL configuration. .. note:: This description is meant to be as an example. When setting up a productive CA, you should ask a PKI consultant for assistance. Setup ..... You can use the :ref:`edumfa-manage` tool to setup a new CA like this:: edumfa-manage ca create myCA This will ask you for all necessary parameters for the CA and then automatically 1. Create the files for this new CA and 2. Create the CA connector in eduMFA. Management .......... There are different ways to enroll a certificate token. See :ref:`certificate_token`. When an administrator *revokes* a certificate token, the certificate is revoked and a CRL is created. .. note:: eduMFA does not create the CRL regularly. The CRL usually has a validity period of 30 days. I.e. you need to create the CRL on a regular basis. You can use openssl to do so or the edumfa-manage command. edumfa-manage ca list lists all configured *CA connectors*. You can use the ``-v`` switch to get more information. You can create a new CRL with the command:: edumfa-manage ca create_crl This command will check the *overlap period* and only create a new CRL if it is necessary. If you want to force the creation of the CRL, you can use the switch *-f*. For more information on edumfa-manage see :ref:`edumfa-manage`. Templates ......... .. index:: Certificate Templates The *local CA* supports a kind of certificate templates. These "templates" are predefined combinations of *extensions* and *validity days*, as they are passed to openSSL via the parameters ``-extensions`` and ``-days``. This way the administrator can define certificate templates with certain X.509 extensions like keyUsage, extendedKeyUsage, CDPs or AIAs and certificate validity periods. The extensions are defined in YAML file and the location of this file is added to the CA connector definition. The file can look like this, defining three templates "user", "webserver" and "template3":: user: days: 365 extensions: "user" webserver: days: 750 extensions: "server" template3: days: 10 extensions: "user" .. _msca_caconnector: Microsoft CA Connector ~~~~~~~~~~~~~~~~~~~~~~ This CA connector communicates to the eduMFA MS CA worker, that is installed on a Windows server in the Windows Domain. Through this worker, eduMFA can connect potentially to all Microsoft CAs in the Windows Domain. The Microsoft CA Connector has the following options. **Hostname** The hostname (FQDN) or IP address where the eduMFA MS CA worker is running. .. note:: If you configure `Use SSL`, you need to provide the correct hostname as it is contained in the server certificate. **Port** The port on which the worker listens. **Connect via Proxy** Whether the worker is situated behind a HTTP proxy. **Domain CA** The worker will provide a list of available CAs in the domain. This is the actual CA to which eduMFA shall communicate. After providing the initial connection information `hostname` and `Port`, eduMFA can fetch the available CAs in the Windows Domain. The CA is identified by the hostname where the Microsoft CA is running and the name of the CA like `\\`. **Use SSL** This is a boolean parameter. If it is checked, then eduMFA will communicate to the CA worker via TLS. Depending on the worker configuration it will also be required, to provide a client certificate for authentication. .. note:: In productive use SSL should always be activated and a client certificate must be used for authentication. **CA certificate** This is the location of the file, that contains the CA certificate, that issued the CA worker server certificate. This file is located on the eduMFA server in PEM format. **Client certificate** This is the file location of the certificate that eduMFA uses to authenticate against the CA worker. It is in PEM format. .. note:: The subject of this certificate must match the name of the eduMFA server as seen by the CA worker. It is a good idea to request the client certificate from the CA on the domain where the CA worker is actually running at. **Client private key** This is the location of the file containing the private key that belongs to the `Client certificate`. It is in PEM format and can either be password protected (encrypted) or not. The key can be provided in PKCS1 or PKCS8 format. .. note:: The PCKCS1 format will start with ``-----BEGIN RSA PRIVATE KEY-----``, the PKCS8 format will start with ``-----BEGIN PRIVATE KEY-----``. To convert between PKCS1 and PKCS8 format you can use:: openssl pkcs8 -in private-p1.pem -topk8 -out private-p8.pem -nocrypt openssl pkcs8 -in private-p1.pem -topk8 -out private-p8-encrypted.pem openssl rsa -in private-p8.pem -out private-p1.pem **Password of client certificate** This is the password of the encrypted client private key. .. note:: We strongly recommend to protect the file with a password. As encrypted key files we only support PKCS8! Basic setup from the command line ................................. Of course the MS CA Connector can be configured in the eduMFA Web UI. For quick setup, you can also configure a connector at the command line using :ref:`edumfa-manage` like this:: edumfa-manage ca create -t microsoft It will ask you all relevant questions and setup a connector in eduMFA.