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examples/README.md
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examples/README.md
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# LDAP Docker Examples
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This directory contains example scripts and applications demonstrating how to use the LDAP server for authentication and user management.
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## Available Examples
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### 1. Simple Authentication (`simple_auth.py`)
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A Python script demonstrating basic LDAP authentication and user information retrieval.
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**Features:**
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- Authenticate users with username/password
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- Retrieve detailed user information
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- Get user group memberships
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- List all users in the directory
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**Usage:**
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```bash
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# Authenticate a user (default: jdoe)
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python examples/simple_auth.py
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# Authenticate with custom credentials
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python examples/simple_auth.py --username jsmith --password password123
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# List all users
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python examples/simple_auth.py --list-users
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# Use a different LDAP server
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python examples/simple_auth.py --server ldaps://localhost:636
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```
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**Example Output:**
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```
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🔐 LDAP Authentication Example
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Server: ldap://localhost:389
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Attempting to authenticate user: jdoe
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✅ Authentication successful for user: jdoe
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✅ Authentication successful!
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Fetching user information...
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==================================================
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USER INFORMATION
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==================================================
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Username: jdoe
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Full Name: John Doe
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First Name: John
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Last Name: Doe
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Email: jdoe@testing.local
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UID Number: 10001
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GID Number: 10001
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DN: uid=jdoe,ou=people,dc=testing,dc=local
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==================================================
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Fetching user groups...
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User belongs to 2 group(s):
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• developers
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• users
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```
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## Using in Your Application
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### Python with ldap3
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```python
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from ldap3 import Server, Connection
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# Connect and authenticate
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server = Server('ldap://localhost:389')
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conn = Connection(
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server,
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user='uid=jdoe,ou=people,dc=testing,dc=local',
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password='password123',
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auto_bind=True
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)
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# Search for users
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conn.search(
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'dc=testing,dc=local',
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'(objectClass=inetOrgPerson)',
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attributes=['uid', 'cn', 'mail']
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)
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for entry in conn.entries:
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print(f"{entry.cn}: {entry.mail}")
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conn.unbind()
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```
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### Using ldapsearch (Command Line)
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```bash
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# Search for a user
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ldapsearch -H ldap://localhost:389 \
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-D "cn=admin,dc=testing,dc=local" \
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-w admin_password \
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-b "dc=testing,dc=local" \
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"(uid=jdoe)"
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# List all users
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ldapsearch -H ldap://localhost:389 \
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-D "cn=admin,dc=testing,dc=local" \
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-w admin_password \
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-b "ou=people,dc=testing,dc=local" \
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"(objectClass=inetOrgPerson)" \
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uid cn mail
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```
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### Web Application Integration
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#### Flask Example
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```python
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from flask import Flask, request, jsonify
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from ldap3 import Server, Connection
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app = Flask(__name__)
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@app.route('/login', methods=['POST'])
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def login():
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username = request.json.get('username')
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password = request.json.get('password')
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server = Server('ldap://localhost:389')
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user_dn = f'uid={username},ou=people,dc=testing,dc=local'
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try:
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conn = Connection(server, user=user_dn, password=password)
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if conn.bind():
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return jsonify({'status': 'success', 'message': 'Authenticated'})
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else:
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return jsonify({'status': 'error', 'message': 'Invalid credentials'}), 401
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except:
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return jsonify({'status': 'error', 'message': 'Authentication failed'}), 401
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```
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#### Django Example
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```python
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# settings.py
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import ldap
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from django_auth_ldap.config import LDAPSearch
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AUTH_LDAP_SERVER_URI = "ldap://localhost:389"
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AUTH_LDAP_BIND_DN = "cn=admin,dc=testing,dc=local"
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AUTH_LDAP_BIND_PASSWORD = "admin_password"
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AUTH_LDAP_USER_SEARCH = LDAPSearch(
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"ou=people,dc=testing,dc=local",
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ldap.SCOPE_SUBTREE,
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"(uid=%(user)s)"
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)
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AUTHENTICATION_BACKENDS = [
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'django_auth_ldap.backend.LDAPBackend',
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'django.contrib.auth.backends.ModelBackend',
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]
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```
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## Common Integration Patterns
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### 1. Simple Bind Authentication
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The most straightforward approach - try to bind with user credentials:
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```python
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def authenticate_user(username, password):
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server = Server('ldap://localhost:389')
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user_dn = f'uid={username},ou=people,dc=testing,dc=local'
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conn = Connection(server, user=user_dn, password=password)
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return conn.bind()
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```
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### 2. Search and Bind
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Search for the user first, then authenticate:
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```python
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def authenticate_user(username, password):
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# First, search for the user with admin credentials
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server = Server('ldap://localhost:389')
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admin_conn = Connection(
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server,
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user='cn=admin,dc=testing,dc=local',
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password='admin_password',
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auto_bind=True
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)
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admin_conn.search(
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'ou=people,dc=testing,dc=local',
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f'(uid={username})',
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attributes=['dn']
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)
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if not admin_conn.entries:
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return False
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user_dn = admin_conn.entries[0].entry_dn
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admin_conn.unbind()
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# Now authenticate as the user
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user_conn = Connection(server, user=user_dn, password=password)
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return user_conn.bind()
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```
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### 3. Group-Based Authorization
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Check if user belongs to specific groups:
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```python
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def user_has_role(username, required_group):
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server = Server('ldap://localhost:389')
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conn = Connection(
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server,
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user='cn=admin,dc=testing,dc=local',
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password='admin_password',
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auto_bind=True
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)
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user_dn = f'uid={username},ou=people,dc=testing,dc=local'
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conn.search(
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'ou=groups,dc=testing,dc=local',
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f'(&(objectClass=groupOfNames)(member={user_dn})(cn={required_group}))',
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attributes=['cn']
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)
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return len(conn.entries) > 0
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```
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## Testing Your Integration
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### 1. Start the LDAP Server
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```bash
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make start
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```
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### 2. Test Connection
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```bash
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python examples/simple_auth.py --list-users
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```
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### 3. Test Authentication
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```bash
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python examples/simple_auth.py --username jdoe --password password123
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```
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### 4. Test with Your Application
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Point your application to:
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- LDAP URL: `ldap://localhost:389`
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- LDAPS URL: `ldaps://localhost:636` (with SSL)
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- Base DN: `dc=testing,dc=local`
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## Available Test Accounts
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| Username | Password | Groups | Purpose |
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|----------|----------|--------|---------|
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| admin | password123 | admins | Administrative testing |
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| jdoe | password123 | developers, users | Regular user testing |
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| jsmith | password123 | developers, users | Regular user testing |
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| testuser | password123 | users | Basic user testing |
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## SSL/TLS Configuration
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For production-like testing with LDAPS:
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```python
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import ssl
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from ldap3 import Server, Connection, Tls
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tls = Tls(
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ca_certs_file='certs/ca.crt',
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validate=ssl.CERT_REQUIRED
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)
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server = Server('ldaps://localhost:636', use_ssl=True, tls=tls)
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conn = Connection(server, user=user_dn, password=password, auto_bind=True)
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```
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## Troubleshooting
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### Connection Refused
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```bash
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# Check if LDAP server is running
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make status
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# Start if not running
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make start
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```
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### Authentication Fails
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```bash
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# Verify user exists
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make test-users
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# Check LDAP logs
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make logs
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```
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### Python ImportError
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```bash
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# Install ldap3 library
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uv pip install ldap3
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# or
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pip install ldap3
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```
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## Additional Resources
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- [ldap3 Documentation](https://ldap3.readthedocs.io/)
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- [LDAP Protocol Overview](https://ldap.com/ldap-protocol/)
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- [Django LDAP Authentication](https://django-auth-ldap.readthedocs.io/)
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- [Flask-LDAP3-Login](https://flask-ldap3-login.readthedocs.io/)
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## Contributing Examples
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Have an example for a specific framework or use case? Contributions are welcome!
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Examples we'd love to see:
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- Express.js / Node.js authentication
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- Ruby on Rails integration
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- Go LDAP client
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- Java Spring Security LDAP
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- PHP authentication
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- Docker Compose with application stack
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Submit a pull request with your example!
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