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Custodia
========

A tool for managing secrets.

See our `Quick Start Guide <docs/source/quick.rst>`__

Custodia is a project that aims to define an API for modern cloud
applications that allows to easily store and share passwords, tokens,
certificates and any other secret in a way that keeps data secure,
manageable and auditable.

The Custodia project offers example implementations of clear text and
encrypted backends, and aims to soon provide drivers to store data in
external data stores like the Vault Project, OpenStack's Barbican,
FreeIPA's Vault and similar.

In future the Custodia project plans to enhance and enrich the API to
provide access to even more secure means of dealing with private keys,
like HSM as a Service and other similar security systems.

See the Custodia documentation for more information:
https://custodia.readthedocs.io

Requirements
------------

Runtime
~~~~~~~

-  configparser (Python 2.7)
-  cryptography
-  jwcrypto >= 0.2
-  requests
-  six

Testing
~~~~~~~

-  pip
-  setuptools >= 18.0
-  tox >= 2.3.1
-  wheel

custodia.ipa depends on several binary extensions and shared libraries
for e.g. python-cryptography, python-gssapi, python-ldap, and
python-nss. For testing and installation in a virtual environment, a C
compiler and several development packages are required.

Fedora
^^^^^^

::

    $ sudo dnf install python2 python-pip python-virtualenv python-devel \
        gcc redhat-rpm-config krb5-workstation krb5-devel libffi-devel \
        nss-devel openldap-devel cyrus-sasl-devel openssl-devel

Debian / Ubuntu
^^^^^^^^^^^^^^^

::

    $ sudo apt-get update
    $ sudo apt-get install -y python2.7 python-pip python-virtualenv python-dev \
        gcc krb5-user libkrb5-dev libffi-dev libnss3-dev libldap2-dev \
        libsasl2-dev libssl-dev

API stability
-------------

Some APIs are provisional and may change in the future.

-  Command line interface in module ``custodia.cli``.
-  The script custodia-cli.
-  *custodia.ipa* plugins

--------------

custodia.ipa — IPA plugins for Custodia
=======================================

**WARNING** *custodia.ipa is a tech preview with a provisional API.*

custodia.ipa is a collection of plugins for
`Custodia <https://custodia.readthedocs.io/>`__. It provides integration
with `FreeIPA <http://www.freeipa.org>`__. The *IPAVault* plugin is an
interface to `FreeIPA
vault <https://www.freeipa.org/page/V4/Password_Vault>`__. Secrets are
encrypted and stored in `Dogtag <http://www.dogtagpki.org>`__'s Key
Recovery Agent. The *IPACertRequest* plugin creates private key and
signed certificates on-demand. Finally the *IPAInterface* plugin is a
helper plugin that wraps ipalib and GSSAPI authentication.

custodia.ipa requirements
-------------------------

-  ipalib >= 4.5.0
-  ipaclient >= 4.5.0
-  Python 2.7 (Python 3 support in IPA vault is unstable.)

ipalib and ipaclient are not pulled in and install by default. The
packages depend on additional OS packages for Kerberos/GSSAPI, LDAP and
NSS crypto library. The dependencies are listed under *testing*
requirements above.

::

    $ pip install custodia[ipa]

custodia.ipa requires an IPA-enrolled host and a Kerberos TGT for
authentication. It is recommended to provide credentials with a keytab
file or GSS-Proxy. Furthermore *IPAVault* depends on Key Recovery Agent
service (``ipa-kra-install``).

--------------

Example configuration
---------------------

Create directories

::

    $ sudo mkdir /etc/custodia /var/lib/custodia /var/log/custodia /var/run/custodia
    $ sudo chown USER:GROUP /var/lib/custodia /var/log/custodia /var/run/custodia
    $ sudo chmod 750 /var/lib/custodia /var/log/custodia

Create service account and keytab

::

    $ kinit admin
    $ ipa service-add custodia/$HOSTNAME
    $ ipa service-allow-create-keytab custodia/$HOSTNAME --users=admin
    $ mkdir -p /etc/custodia
    $ ipa-getkeytab -p custodia/$HOSTNAME -k /etc/custodia/ipa.keytab
    $ chown custodia:custodia /etc/custodia/ipa.keytab

The IPA cert request plugin needs additional permissions

::

    $ ipa privilege-add \
        --desc="Create and request service certs with Custodia" \
        "Custodia Service Certs"
    $ ipa privilege-add-permission \
        --permissions="Retrieve Certificates from the CA" \
        --permissions="Request Certificate" \
        --permissions="Revoke Certificate" \
        --permissions="System: Modify Services" \
        "Custodia Service Certs"
    # for add_principal=True
    $ ipa privilege-add-permission \
        --permissions="System: Add Services" \
        "Custodia Service Certs"
    $ ipa role-add \
        --desc="Create and request service certs with Custodia" \
        "Custodia Service Cert Adminstrator"
    $ ipa role-add-privilege \
        --privileges="Custodia Service Certs" \
        "Custodia Service Cert Adminstrator"
    $ ipa role-add-member \
        --services="custodia/$HOSTNAME" \
        "Custodia Service Cert Adminstrator"

Create ``/etc/custodia/ipa.conf``

::

    # /etc/custodia/ipa.conf

    [global]
    debug = true
    makedirs = true

    [auth:ipa]
    handler = IPAInterface
    keytab = ${configdir}/${instance}.keytab
    ccache = FILE:${rundir}/ccache

    [auth:creds]
    handler = SimpleCredsAuth
    uid = root
    gid = root

    [authz:paths]
    handler = SimplePathAuthz
    paths = /. /secrets

    [store:vault]
    handler = IPAVault

    [store:cert]
    handler = IPACertRequest
    backing_store = vault

    [/]
    handler = Root

    [/secrets]
    handler = Secrets
    store = vault

    [/secrets/certs]
    handler = Secrets
    store = cert

Create ``/etc/systemd/system/custodia@ipa.service.d/override.conf``

On Fedora 26 and newer, the Custodia service file defaults to Python 3.
Although FreeIPA 4.5 has support for Python 3, it's not stable yet.
Therefore it is necessary to run the ``custodia.ipa`` plugins with
Python 2.7. You can either use ``systemctl edit custodia@py2.service``
to create an override or copy the file manually. Don't forget to run
``systemctl daemon-reload`` in the latter case.

::

    [Service]
    ExecStart=
    ExecStart=/usr/sbin/custodia-2 --instance=%i /etc/custodia/%i.conf

Run Custodia server

::

    $ systemctl start custodia@ipa.socket

IPA cert request
----------------

The *IPACertRequest* store plugin generates or revokes certificates on
the fly. It uses a backing store to cache certs and private keys. The
plugin can create service principal automatically. However the host must
already exist. The *IPACertRequest* does not create host entries on
demand.

A request like ``GET /path/to/store/HTTP/client1.ipa.example`` generates
a private key and CSR for the service ``HTTP/client1.ipa.example`` with
DNS subject alternative name ``client1.ipa.example``. The CSR is then
forwarded to IPA and signed by Dogtag. The resulting cert and its trust
chain is returned together with the private key as a PEM bundle.

::

    $ export CUSTODIA_INSTANCE=ipa
    $ custodia-cli get /certs/HTTP/client1.ipa.example
    -----BEGIN RSA PRIVATE KEY-----
    ...
    -----END RSA PRIVATE KEY-----

    Issuer: organizationName=IPA.EXAMPLE, commonName=Certificate Authority
    Subject: organizationName=IPA.EXAMPLE, commonName=client1.ipa.example
    Serial Number: 22
    Validity:
        Not Before: 2017-04-27 09:44:20
        Not After: 2019-04-28 09:44:20
    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----

    Issuer: organizationName=IPA.EXAMPLE, commonName=Certificate Authority
    Issuer: organizationName=IPA.EXAMPLE, commonName=Certificate Authority
    Serial Number: 1
    Validity:
        Not Before: 2017-04-26 08:24:11
        Not After: 2037-04-26 08:24:11
    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----

A DELETE request removes the cert/key pair from the backing store and
revokes the cert at the same time.

Automatic renewal of revoked or expired certificates is not implemented
yet.

FreeIPA 4.4 support
~~~~~~~~~~~~~~~~~~~

The default settings and permissions are tuned for FreeIPA >= 4.5. For
4.4, the plugin must be configured with ``chain=False``. The additional
permission ``Request Certificate with SubjectAltName`` is required, too.

::

    ipa privilege-add-permission \
        --permissions="Request Certificate with SubjectAltName" \
        "Custodia Service Certs"

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