18 KiB

Raw Blame History

FreeIPA & Ansible

The FreeIPA/Ansible system provides centralised identity management for a fleet of Arch Linux machines: single sign-on, host-group-driven package and module deployment, policy enforcement, LUKS backup key collection, scan-result aggregation, and automatic Keycloak configuration.

All relevant files live under setup/modules/FreeipaAnsible/.

Architecture

┌──────────────────────────────────────────────────────────────────────┐
│  FreeIPA + Keycloak + Samba container (docker-compose)               │
│                                                                      │
│  • FreeIPA — user/host directory, Kerberos KDC, DNS (optional)       │
│  • Keycloak — OIDC provider federating FreeIPA via LDAP              │
│  • Samba — two SMB shares for scan results and LUKS backup keys      │
│  • cronie — hourly scan-result analyser (ansipa-check-scans)         │
└───────────┬─────────────────────────┬────────────────────────────────┘
            │ SSSD / Kerberos         │ SMB (445)
            ▼                         ▼
┌──────────────────────┐    ┌─────────────────────────────────────────┐
│  Enrolled client     │    │  Ansible controller                     │
│                      │    │                                         │
│  • sssd              │    │  • deploy-ansipa-*.yml playbooks        │
│  • ipa CLI           │    │  • collect-luks-keys.yml                │
│  • Ansible-deployed  │    │    (uploads keys to ansipa-luks-keys    │
│    timers:           │    │     share as luks-upload service acct)  │
│    ├── pkg installer │    └─────────────────────────────────────────┘
│    ├── module install│
│    ├── Flatpak install
│    ├── baseuser sync │
│    └── policy enforcer (every 30 min)
│        ├── binary blocking
│        ├── daemon enable/disable
│        ├── Timeshift backups
│        ├── security scans + SMB upload
│        └── alert fetch + desktop notify
└──────────────────────┘

FreeIPA Server Container

Quick Start

cd setup/modules/FreeipaAnsible/image
cp .env.example .env
$EDITOR .env                        # set all required variables
docker compose up -d
docker compose logs -f freeipa      # watch first-boot (~10 min)
# Once freeipa is healthy:
./keycloak-configure.sh             # wire Keycloak → FreeIPA LDAP

To run FreeIPA without Keycloak:

docker compose up -d freeipa

Environment Variables (`.env`)

Variable	Required	Description
`IPA_HOSTNAME`	yes	FQDN of the IPA server (e.g. `ipa.corp.example.com`)
`IPA_DOMAIN`	yes	DNS domain (e.g. `corp.example.com`)
`IPA_REALM`	—	Kerberos realm; defaults to `IPA_DOMAIN` uppercased
`IPA_ADMIN_PASSWORD`	yes	`admin` account password
`IPA_DM_PASSWORD`	yes	Directory Manager password
`IPA_SETUP_DNS`	—	`true` to enable integrated DNS (default `false`)
`IPA_DNS_FORWARDER`	—	Upstream DNS when `IPA_SETUP_DNS=true`
`IPA_SETUP_KRA`	—	`true` to enable the Key Recovery Authority
`SMB_SCAN_PASSWORD`	yes	Password for the `scanupload` Samba service account
`LUKS_KEY_UPLOAD_PASSWORD`	yes	Password for the `luks-upload` Samba service account
`KC_HOSTNAME`	yes	Public hostname of Keycloak
`KC_REALM`	—	Keycloak realm name (default `corp`)
`KC_ADMIN`	—	Keycloak admin username (default `admin`)
`KC_ADMIN_PASSWORD`	yes	Keycloak admin password
`KC_DB_PASSWORD`	yes	PostgreSQL password for Keycloak
`IPA_BIND_DN`	—	LDAP bind DN for Keycloak federation (default: Directory Manager)
`IPA_BIND_PASSWORD`	—	LDAP bind password; leave blank to reuse `IPA_DM_PASSWORD`
`IPA_USE_LDAPS`	—	`true` to use LDAPS for Keycloak federation

Exposed Ports

Port	Protocol	Service
389	TCP	LDAP
636	TCP	LDAPS
88	TCP + UDP	Kerberos
464	TCP + UDP	kpasswd
443	TCP	HTTPS (IPA web UI)
445	TCP	SMB (Samba shares)
139	TCP	NetBIOS session (Samba)
137	UDP	NetBIOS name service
138	UDP	NetBIOS datagram
8080	TCP	Keycloak HTTP
8443	TCP	Keycloak HTTPS

Container Internals

On first start, ipa-first-boot.service runs ipa-first-boot.sh to initialise the FreeIPA instance. On every start, ansipa-smb.service runs ansipa-smb-setup.sh to configure Samba (the container rootfs is ephemeral — Samba config and users must be re-applied after restarts).

Data persisted to the /data volume:

/data/
├── samba/
│   ├── passdb.tdb          # Samba password database (survives restarts)
│   └── ansipa-smb.env      # Persisted SMB passwords (auto-written on first start)
├── scan-results/
│   ├── archive/<host>/     # Client scan logs (written by clients via SMB)
│   └── alerts/<host>/      # Alert files generated by ansipa-check-scans (hourly)
└── luks-keys/              # LUKS backup keys (written by Ansible controller via SMB)

SMB Shares

The container exposes two Samba shares, both configured by ansipa-smb-setup.sh.

`ansipa-scans` — Scan Result Archive

Path: /data/scan-results
Authenticated user: scanupload (write-only; no browse)
Purpose: Clients enrolled in policy-security-scan upload their daily ClamAV / rkhunter / chkrootkit logs here after each scan run.
Analysis: ansipa-check-scans.sh runs hourly via cronie; it reads each host's archive logs and writes *.alert files to the alerts/ subdirectory when concerning patterns are found.
Credentials file on clients: /etc/ansipa-smb.creds (deployed by deploy-ansipa-policies.yml)

`ansipa-luks-keys` — LUKS Backup Key Store

Path: /data/luks-keys
Permissions: write-only for luks-upload; read-only for members of the KeyAdmin Linux group
Purpose: The Ansible controller writes each host's LUKS backup key here after collecting it via collect-luks-keys.yml.
Access control: Add an admin Samba user to the KeyAdmin group on the container:
```
# On the freeipa container
useradd -r -G KeyAdmin <username>
smbpasswd -a <username>
```
The KeyAdmin group and the luks-upload / scanupload service accounts are created by ansipa-smb-setup.sh on every container start.

Client Enrollment

Via Installer Module

Select freeipa-client during tui-install.sh or install-modules.sh.

Manual Enrollment

Three modes:

# Answerfile mode (unattended)
bash setup/modules/FreeipaAnsible/freeipa-client.sh \
    --answerfile setup/modules/FreeipaAnsible/freeipa-client-answerfile.json

# Interactive prompts
bash setup/modules/FreeipaAnsible/freeipa-client.sh --interactive

# Direct flag passthrough to freeipa-enroll.sh
bash setup/modules/FreeipaAnsible/freeipa-client.sh \
    --domain freeipa.example.com \
    --server ipa.example.com \
    --principal admin

Client Answerfile Schema

{
  "domain":      "freeipa.abdelbaki.eu",
  "realm":       "FREEIPA.ABDELBAKI.EU",
  "server":      "freeipa.abdelbaki.eu",
  "hostname":    "",
  "principal":   "admin",
  "password":    "",
  "mkhomedir":   true,
  "sudo":        true,
  "dns_update":  true,
  "ntp_server":  "",
  "fido2":       false,
  "fido2_users": []
}

Leave hostname blank to use the current machine hostname. Leave password blank to be prompted at enrollment time.

Ansible Playbooks

All playbooks live in setup/modules/FreeipaAnsible/ansible/ and require an inventory of enrolled IPA clients.

Deploy Package Auto-Installer

ansible-playbook -i inventory deploy-ansipa-install.yml

Deploys ansipa-install-packages.sh + a systemd timer (every 30 min). The script queries IPA for host groups named ansipa-install-<package> and installs or removes packages to match.

Group naming convention: ansipa-install-firefox → installs firefox.

Deploy Module Auto-Installer

ansible-playbook -i inventory deploy-ansipa-modules.yml \
    [-e ansipa_user=amir]

Deploys ansipa-install-modules.sh + timer. Queries for groups named ansipa-module-<name> and runs the matching script from /usr/local/lib/ansipa-modules/<name>.sh. Module scripts are copied from setup/modules/optional-Modules/apps/*.sh.

Each module is applied once and stamped in /var/lib/ansipa-modules/<name>.done.

Deploy BaseUser Sync

ansible-playbook -i inventory deploy-baseuser-sync.yml

Deploys a systemd.path unit that triggers on login. Users who are members of the IPA BaseUser group are automatically added to the local baseusers group.

Deploy Policy Enforcer

ansible-playbook -i inventory deploy-ansipa-policies.yml \
    -e smb_scan_password=<SMB_SCAN_PASSWORD>

Deploys ansipa-enforce-policies.sh, ansipa-fetch-alerts.sh, ansipa-scan-notify.sh, a systemd timer (every 30 min), and /etc/ansipa-smb.creds. Use ansible-vault for the password in production.

Collect LUKS Backup Keys

ansible-playbook -i inventory collect-luks-keys.yml \
    -e luks_smb_server=ipa.corp.example.com \
    -e luks_upload_password=<LUKS_KEY_UPLOAD_PASSWORD>

For each enrolled host:

Fetches /_LUKS_BACKUP_KEY from the client to a local staging directory.
Uploads the staged key to //ipa-server/ansipa-luks-keys/<hostname>_LUKS_BACKUP_KEY via smbclient using a temporary credentials file (no_log, deleted in post_tasks).
Removes the local staging copy after a successful upload.

Keys on the SMB share are accessible only to KeyAdmin group members (see SMB Shares).

Schedule automatic collection:

# Add to crontab on the Ansible controller
0 3 * * * cd /path/to/FreeipaAnsible/ansible && \
    ansible-playbook -i inventory collect-luks-keys.yml \
    -e luks_smb_server=ipa.corp.example.com \
    -e luks_upload_password=<LUKS_KEY_UPLOAD_PASSWORD>

Host Group Reference

Group prefix	Handled by	Effect
`ansipa-install-<pkg>`	`ansipa-install-packages.sh`	Install/remove native package
`ansipa-module-<name>`	`ansipa-install-modules.sh`	Run module script once
`fp_install-<app>`	`ansipa-install-flatpaks.sh`	Install Flatpak app
`BaseUser`	`auto-add-baseuser.sh`	Add user to local `baseusers` group
`policy-block-binary-<name>`	`ansipa-enforce-policies.sh`	Block binary via PATH wrapper + AppArmor
`policy-daemon-enable-<unit>`	`ansipa-enforce-policies.sh`	`systemctl enable --now <unit>`; reverted on leave
`policy-daemon-disable-<unit>`	`ansipa-enforce-policies.sh`	`systemctl disable --now <unit>`; reverted on leave
`policy-timeshift-backup`	`ansipa-enforce-policies.sh`	Daily Timeshift snapshot at 03:00
`policy-security-scan`	`ansipa-enforce-policies.sh`	Daily ClamAV + rkhunter + chkrootkit scan + SMB upload
`policy-scan-notify`	`ansipa-enforce-policies.sh`	Fetch server alerts, notify user every 10 min until acknowledged
`no_local_users`	`ansipa-enforce-policies.sh`	Lock passwords for root and all local users (UID ≥ 1000); reverted on leave

Policy Enforcement

ansipa-enforce-policies.sh runs every 30 minutes on each enrolled client (deployed by deploy-ansipa-policies.yml). All policies are idempotent and reversible — leaving a host group undoes the policy on the next run.

Binary Blocking

Adding a host to policy-block-binary-<name> applies two layers:

PATH wrapper — a script in /usr/local/bin/<name> that prints a policy message and exits 1. Takes priority over the real binary for $PATH-based calls.
AppArmor deny profile — /etc/apparmor.d/ansipa-block-<name> with an empty profile, denying all file access. Blocks absolute-path calls and direct exec(). Skipped silently if apparmor_parser is not present.

Leaving the group removes both layers on the next enforcer run.

Daemon Enable / Disable

Group	Effect on join	Effect on leave
`policy-daemon-enable-<unit>`	`systemctl enable --now <unit>`	`systemctl disable --now <unit>`
`policy-daemon-disable-<unit>`	`systemctl disable --now <unit>`	`systemctl enable --now <unit>`

The .service suffix is optional — it is appended automatically when the unit name contains no dot, so any systemd unit type works. If a unit appears in both enable and disable groups simultaneously, it is skipped with a warning.

State is tracked in /var/lib/ansipa-policies/daemon-enabled and daemon-disabled so revert actions are applied correctly when a host leaves a group.

Security Scans & Alert Pipeline

Client (policy-security-scan)
  └── daily 02:00: clamscan + rkhunter + chkrootkit
       └── smbclient → //ipa-server/ansipa-scans/archive/<host>/<date>.log

IPA container (hourly cron)
  └── ansipa-check-scans.sh
       └── grep for FOUND / Warning / Possible rootkit / etc.
            └── writes /data/scan-results/alerts/<host>/<date>.alert

Client (policy-scan-notify, every 10 min via systemd timer)
  └── ansipa-fetch-alerts.sh (root)
       └── downloads *.alert files → ~/administration/<host>/ per active user
            └── ansipa-scan-notify.sh (user daemon, started on login via profile.d)
                 └── notify-send every 10 min while *.alert files remain
                      └── delete file to acknowledge → removed from server on next fetch

Prerequisites for scan policies:

Add host to ansipa-module-anti-malware before policy-security-scan (installs ClamAV, rkhunter, chkrootkit).
samba-client is installed automatically by deploy-ansipa-policies.yml.
SMB credentials are written to /etc/ansipa-smb.creds (root-only, 0600).

Local User Lockdown

Adding a host to the no_local_users group locks the password of every local account — root (UID 0) and all regular users (UID ≥ 1000) — using passwd -l. Accounts whose passwords are already locked (! or * prefix in shadow) are left untouched and are not tracked.

State is persisted in /var/lib/ansipa-policies/no-local-users (one username per line). Only accounts that were actively unlocked at apply time are written to this file, so the revert step only unlocks what was changed.

Action	Effect
Join `no_local_users`	`passwd -l` on root + all UID ≥ 1000 local accounts
Leave `no_local_users`	`passwd -u` on every account listed in the state file

Interaction with FreeIPA sudo: Domain accounts in the sudoers or sudo-nopasswd FreeIPA groups retain full sudo access via SSSD — local password lockdown does not affect them. Ensure at least one domain admin has sudo before adding a host to this group.

LUKS Key Flow

  Install time (arch-autoinstall.sh or archbaseos-guided-install.sh)
  ─────────────────────────────────────────────────────────────────
  1. User sets primary LUKS passphrase interactively
  2. 64-byte random key generated from /dev/urandom
  3. Key enrolled in second LUKS slot
  4. Key written to /_LUKS_BACKUP_KEY (mode 0400, root-only)
     inside the encrypted Btrfs volume

  Post-install (Ansible controller)
  ──────────────────────────────────
  5. collect-luks-keys.yml runs
  6. Fetches /_LUKS_BACKUP_KEY from each client (become: yes)
  7. Uploads to //ipa-server/ansipa-luks-keys/<host>_LUKS_BACKUP_KEY
     as 'luks-upload' service account (write-only, no_log)
  8. Local staging copy deleted after successful upload

  Recovery (KeyAdmin member)
  ───────────────────────────
  9. Connect to //ipa-server/ansipa-luks-keys with a KeyAdmin Samba account
  10. Retrieve <host>_LUKS_BACKUP_KEY and use with cryptsetup

The backup key lives inside the encrypted partition and is only accessible when the disk is already unlocked. Its purpose is to allow an admin to unlock the disk for recovery without knowing the user's passphrase.

Keycloak

keycloak-configure.sh performs the initial wiring after both FreeIPA and Keycloak containers are healthy:

Creates the configured realm in Keycloak.
Sets up an LDAP federation pointing at the FreeIPA LDAP/LDAPS endpoint.
Configures user and group mappers.

Run it once after the first docker compose up:

cd setup/modules/FreeipaAnsible/image
./keycloak-configure.sh

The Keycloak admin console is available at http://<KC_HOSTNAME>:8080 (dev mode) or https://<KC_HOSTNAME>:8443 (requires TLS cert for production start command).

Auto Enrollment + Ansible

bash setup/modules/FreeipaAnsible/auto-enroll-ansible.sh

Combines FreeIPA client enrollment and Ansible deployment in one shot. Useful for provisioning scripts that run on first boot.

18 KiB Raw Blame History