sso-manager-node/docs/ldap.md

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default	LDAP

LDAP Directory

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SSO Manager runs an OpenLDAP directory holding your users and groups. The app authenticates against it over localhost:389 (inside the all-in-one container) and exposes LDAPS (ldaps://…:636, TLS) for legacy apps that bind LDAP directly — Gitea, Emby, the theta42/proxy, etc.

Directory layout

dc=yourdomain,dc=com
├── ou=people          users (inetOrgPerson + posixAccount + …)
├── ou=groups          groups (groupOfNames)
└── ou=policies        password policies (pwdPolicy)
    └── cn=ppolicy     default policy

Users

User entries are cn=<uid>,ou=people,<base> and carry the objectClasses:

• inetOrgPerson (cn, sn, mail, …) — identity / contact attrs.
• posixAccount (uid, uidNumber, gidNumber, homeDirectory) — the SSO's userFilter is (objectClass=posixAccount), so a user is "a real account" iff it has posixAccount.
• ldapPublicKey — SSH public keys (sshPublicKey).
• sudoRole — per-user sudo rules (sudoCommand, sudoHost, sudoUser).
• theta42Person (custom auxiliary; dateOfBirth).

Passwords are stored as {SSHA512} (8-byte salt, sha512(pass+salt), base64), verified by the pw-sha2 module. The app's hashPasswordSSHA512 is the canonical hasher; if you provision users out-of-band, hash passwords the same way or use slappasswd -h '{SSHA512}'.

Groups

Groups are cn=<name>,ou=groups,<base> (groupOfNames) with a member attribute listing member DNs. The memberOf overlay populates reverse membership (memberOf on the user); refint keeps it consistent on add/remove. Admin permission checks read the group's member list, not memberOf on the user.

The SSO requires three groups (seeded automatically by the entrypoint / install.sh):

Group	Grants
app_sso_admin	full admin (users, groups, settings)
app_sso_oauth_admin	OAuth client management
app_sso_invite	invitation management

TLS (LDAPS / StartTLS)

The bundled slapd generates a self-signed cert on first start (CN = LDAP_CERT_CN, valid 10y, SAN = CN + localhost + 127.0.0.1) and listens on:

• ldaps:/// — 636, TLS (the port to expose for direct-LDAP clients).
• ldap:/// — 389, plain + StartTLS (not mapped to the host by default).

The cert lives on the ldap-certs volume so it persists across container recreation.

Trusting the self-signed cert

Copy it out and add it to the client's CA store:

docker compose cp sso-manager:/etc/openldap/certs/ldap.crt ./ldap.crt

…or, for quick LAN use, set TLS_REQCERT never on the client (the theta42/proxy sets app_ldap__tlsOptions__rejectUnauthorized=false for the same effect).

Using your own cert

Replace the ldap-certs named volume with a bind mount containing your own ldap.crt + ldap.key:

volumes:
  - ./certs:/etc/openldap/certs   # must contain ldap.crt + ldap.key

The entrypoint leaves existing certs untouched (idempotent).

Direct-bind service accounts

For apps that bind LDAP directly, create a dedicated service account under ou=people (e.g. cn=ldapclient,ou=people,<base>) with a strong password — don't reuse the admin DN. The theta-env bootstrap creates this account automatically (cn=ldapclient) and the proxy binds as it. For anything else, create a normal user via the Users page (or POST /api/user) and just don't put it in app_sso_admin or any other privileged group — a plain posixAccount with a strong password is all a read-only bind account needs.

Example bind test:

ldapsearch -x -H ldaps://sso.example.com:636 \
  -D "cn=ldapclient,ou=people,dc=yourdomain,dc=com" -W \
  -b "ou=people,dc=yourdomain,dc=com" '(objectClass=posixAccount)' cn mail

Connecting a 3rd-party app or container

Most self-hosted apps with an "LDAP authentication" settings page — Gitea, Nextcloud, Grafana, Emby, Jenkins, etc. — or containers configured via LDAP_* env vars, all ask for the same handful of values. These are the conf.ldap values from Configuration, applied to your domain:

Field the app asks for	Value
Host / URL	ldaps://<your-sso-host>:636 (preferred), or ldap://<host>:389 + StartTLS
Bind DN	a dedicated service account — e.g. cn=ldapclient,ou=people,<base> (see above)
Bind password	that service account's password
User search base	ou=people,<base>
User search filter	(objectClass=posixAccount)
Username attribute	uid
Email attribute	mail
Group search base	ou=groups,<base>
Group membership attribute	memberOf (on the user entry — populated by the memberof overlay)
TLS	required for 636 (LDAPS); if using the bundled self-signed cert, either trust it (see TLS above) or set the app's "don't verify cert" option for LAN-only use

Worked example: Gitea

Gitea's Admin → Authentication Sources → Add Authentication Source (type LDAP, "Bind DN/Password") maps directly:

• Security Protocol: LDAPS
• Host / Port: your SSO host / 636
• Bind DN: cn=ldapclient,ou=people,dc=yourdomain,dc=com
• Bind Password: the service account's password
• User Search Base: ou=people,dc=yourdomain,dc=com
• User Filter: (&(objectClass=posixAccount)(uid=%s))
• Username Attribute: uid
• E-mail Attribute: mail

Other apps with an LDAP settings UI follow the same shape — the field names above are the constants; only the base DN and hostname change per deployment.

Generic Docker container (LDAP_* env vars)

For images that take a flat env-var LDAP config (there's no single standard, but most look like this):

environment:
  LDAP_URL: ldaps://sso.example.com:636
  LDAP_BIND_DN: cn=ldapclient,ou=people,dc=yourdomain,dc=com
  LDAP_BIND_PASSWORD: <service-account-password>
  LDAP_USER_BASE: ou=people,dc=yourdomain,dc=com
  LDAP_USER_FILTER: (objectClass=posixAccount)
  LDAP_GROUP_BASE: ou=groups,dc=yourdomain,dc=com

Check the specific image's docs for its actual variable names — the values you plug in are still the ones from the table above.

Full Linux host auth (SSH, sudo, login) instead of a single app

If you want a host (not just one app) to authenticate logins, SSH keys, and sudo against this LDAP directory — not just one application — that's a different integration (SSSD + PAM + NSS, not a single bind). See theta42/ldap-client: a script that configures SSSD on Ubuntu/Debian hosts against this directory, including group-based access control and SSH public key retrieval from LDAP.

Modules + overlays (external LDAP servers)

If you point the app at your own LDAP server instead of the bundled slapd, it needs:

• Modules: pw-sha2 (the app stores user passwords as {SSHA512}), ppolicy, memberof, refint.
• Custom schema: the theta42Person auxiliary objectClass with dateOfBirth — see ops/ldap-setup.sh for the LDIF.
• Directory tree: ou=people, ou=groups, ou=policies under the base DN, a default pwdPolicy at cn=ppolicy,ou=policies,<base>.
• Required groups: app_sso_admin, app_sso_invite, app_sso_oauth_admin.

ops/ldap-setup.sh -p <admin-password> configures all of the above idempotently against a running slapd (auto-detects the database holding your base DN, and verifies pwdAccountLockedTime is live — the attribute the app's active/inactive toggle depends on).

Backups and restore

Backup (while slapd is running):

docker compose exec sso-manager slapcat -f /etc/openldap/slapd.conf \
  -b "dc=yourdomain,dc=com" > ldap-backup-$(date +%F).ldif

Store the .ldif off the host — it contains every user's password hash.

Restore into a stopped directory. The SSO image uses a static slapd.conf (slapd starts with -f, not cn=config -F), so restore uses slapadd -f:

docker compose stop sso-manager
docker compose run --rm --no-deps --entrypoint sh sso-manager -c \
  'rm -f /var/lib/ldap/* && slapadd -f /etc/openldap/slapd.conf -l /dev/stdin' \
  < ldap-backup-<date>.ldif
docker compose start sso-manager

Verify: docker compose exec sso-manager ldapsearch -x -b "dc=yourdomain,dc=com".

Redis state (OAuth clients, tokens) and ./config/ secrets are backed up separately — see the Backups and restore section of DEPLOYMENT.md for the full (LDAP + Redis + secrets) runbook.

Troubleshooting

503 OpenLDAP ppolicy overlay is not configured

The ppolicy overlay isn't attached to the database holding your users, so the active/inactive toggle can't set pwdAccountLockedTime:

sudo ./ops/ldap-setup.sh -p 'admin-password' -b dc=yourdomain,dc=com

LDAP connection refused

docker compose exec sso-manager sh -c 'ldapsearch -x -H ldap://localhost:389 -b "" -s base'
systemctl status slapd   # bare metal

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