custodia.ipa 0.2.0

FreeIPA Vault plugin for Custodia

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

custodia.ipa is a storage plugin for Custodia. It provides integration with FreeIPA’s vault facility. Secrets are encrypted and stored in Dogtag’s Key Recovery Agent.

Requirements

Installation

• pip

• setuptools >= 18.0

Runtime

• custodia >= 0.3.1

• ipalib >= 4.5.0

• ipaclient >= 4.5.0

• Python 2.7 (Python 3 support in IPA vault is unstable.)

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.

Testing and development

• wheel

• tox

virtualenv requirements

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

$ virtualenv venv
$ venv/bin/pip install --upgrade custodia.ipa

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

---

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/client1.ipa.example
$ ipa service-allow-create-keytab custodia/client1.ipa.example --users=admin
$ mkdir -p /etc/custodia
$ ipa-getkeytab -p custodia/client1.ipa.example -k /etc/custodia/custodia.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/client1.ipa.example" \
    "Custodia Service Cert Adminstrator"

Create /etc/custodia/custodia.conf

[DEFAULT]
confdir = /etc/custodia
libdir = /var/lib/custodia
logdir = /var/log/custodia
rundir = /var/run/custodia

[global]
debug = true
server_socket = ${rundir}/custodia.sock
auditlog = ${logdir}/audit.log

[auth:ipa]
handler = IPAInterface
keytab = ${confdir}/custodia.keytab
ccache = FILE:${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

Run Custodia server

$ custodia /etc/custodia/custodia.conf

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

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