Digital Identity Systems on Alpine Linux

Digital identity management is crucial for modern applications and services. Learn how to implement secure, scalable identity systems on Alpine Linux using industry-standard protocols and tools! 🔐

What are Digital Identity Systems?

Digital identity systems provide secure methods for:

• User Authentication: Verifying user identities
• Authorization: Controlling access to resources
• Single Sign-On (SSO): One login for multiple services
• Identity Federation: Sharing identities across organizations
• Multi-Factor Authentication: Enhanced security layers

Common Identity Protocols

We’ll implement several protocols:

1. OAuth 2.0: Authorization framework
2. OpenID Connect: Authentication layer on OAuth 2.0
3. SAML 2.0: Security Assertion Markup Language
4. LDAP: Lightweight Directory Access Protocol
5. JWT: JSON Web Tokens for stateless authentication

Prerequisites

Before implementing identity systems:

• Alpine Linux system with root access
• Domain name with SSL certificate
• Basic understanding of authentication concepts
• Database system (PostgreSQL/MySQL)

Step 1: System Preparation

Update System and Install Dependencies

# Update Alpine Linux
sudo apk update && sudo apk upgrade

# Install essential packages
sudo apk add nginx postgresql postgresql-dev redis
sudo apk add python3 python3-dev py3-pip nodejs npm
sudo apk add openssl ca-certificates git curl wget

# Install development tools
sudo apk add build-base cmake libffi-dev

Configure Database

# Initialize PostgreSQL
sudo rc-update add postgresql
sudo /etc/init.d/postgresql setup
sudo /etc/init.d/postgresql start

# Create identity database
sudo -u postgres createdb identity_system
sudo -u postgres psql -c "CREATE USER identity_user WITH PASSWORD 'secure_password';"
sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE identity_system TO identity_user;"

Step 2: OAuth 2.0 Server Implementation

Install OAuth2 Server (Hydra)

# Download Ory Hydra
cd /tmp
wget https://github.com/ory/hydra/releases/download/v2.2.0/hydra_2.2.0_Linux_64bit.tar.gz
tar -xzf hydra_2.2.0_Linux_64bit.tar.gz
sudo mv hydra /usr/local/bin/

# Verify installation
hydra version

Configure Hydra

# Create Hydra configuration directory
sudo mkdir -p /etc/hydra
sudo nano /etc/hydra/config.yaml

Add Hydra configuration:

# Hydra Configuration
serve:
  public:
    host: 0.0.0.0
    port: 4444
  admin:
    host: 0.0.0.0
    port: 4445

dsn: postgres://identity_user:secure_password@localhost:5432/identity_system?sslmode=disable

urls:
  self:
    issuer: https://auth.yourdomain.com
  consent: https://auth.yourdomain.com/consent
  login: https://auth.yourdomain.com/login
  logout: https://auth.yourdomain.com/logout

secrets:
  system:
    - "your-32-character-secret-key-here!"

oidc:
  subject_identifiers:
    supported_types:
      - pairwise
      - public
    pairwise:
      salt: "your-salt-here"

ttl:
  login_consent_request: 1h
  access_token: 1h
  refresh_token: 720h
  id_token: 1h
  auth_code: 10m

oauth2:
  expose_internal_errors: false
  hashers:
    algorithm: bcrypt
    bcrypt:
      cost: 12

Initialize Hydra Database

# Run database migrations
hydra migrate sql --yes postgres://identity_user:secure_password@localhost:5432/identity_system?sslmode=disable

# Create OAuth2 client
hydra clients create \
    --endpoint http://localhost:4445 \
    --id example-client \
    --secret client-secret \
    --grant-types authorization_code,refresh_token \
    --response-types code \
    --scope openid,offline \
    --callbacks https://yourapp.com/callback

Create Hydra Service

# Create systemd service file
sudo nano /etc/init.d/hydra

Add service script:

#!/sbin/openrc-run

name="hydra"
description="Ory Hydra OAuth2 Server"

command="/usr/local/bin/hydra"
command_args="serve all --config /etc/hydra/config.yaml"
pidfile="/var/run/hydra.pid"
command_background="yes"

depend() {
    need net postgresql
}

start_pre() {
    checkpath --directory --owner root:root --mode 0755 /var/run
}

Start Hydra service:

sudo chmod +x /etc/init.d/hydra
sudo rc-update add hydra default
sudo rc-service hydra start

Step 3: OpenID Connect Identity Provider

Install and Configure Keycloak

# Download Keycloak
cd /opt
sudo wget https://github.com/keycloak/keycloak/releases/download/22.0.1/keycloak-22.0.1.tar.gz
sudo tar -xzf keycloak-22.0.1.tar.gz
sudo mv keycloak-22.0.1 keycloak

# Create keycloak user
sudo adduser -D -s /bin/false keycloak
sudo chown -R keycloak:keycloak /opt/keycloak

Configure Keycloak Database

# Create Keycloak database
sudo -u postgres createdb keycloak
sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE keycloak TO identity_user;"

# Configure Keycloak database connection
sudo nano /opt/keycloak/conf/keycloak.conf

Add database configuration:

# Database configuration
db=postgres
db-username=identity_user
db-password=secure_password
db-url=jdbc:postgresql://localhost:5432/keycloak

# Hostname configuration
hostname=auth.yourdomain.com
hostname-strict=false
hostname-strict-https=false

# HTTP configuration
http-enabled=true
http-port=8080
https-port=8443

# Proxy configuration
proxy=edge

Initialize Keycloak

# Build Keycloak
cd /opt/keycloak
sudo -u keycloak bin/kc.sh build

# Create admin user
sudo -u keycloak bin/kc.sh start-dev --verbose &
sleep 30

# Create admin user via CLI
curl -X POST http://localhost:8080/admin/realms/master/users \
  -H "Content-Type: application/json" \
  -d '{
    "username": "admin",
    "email": "[email protected]",
    "enabled": true,
    "credentials": [{
      "type": "password",
      "value": "admin_password",
      "temporary": false
    }]
  }'

Create Keycloak Service

# Create service script
sudo nano /etc/init.d/keycloak

Add service configuration:

#!/sbin/openrc-run

name="keycloak"
description="Keycloak Identity and Access Management"

user="keycloak"
group="keycloak"
command="/opt/keycloak/bin/kc.sh"
command_args="start --optimized"
pidfile="/var/run/keycloak.pid"
command_background="yes"

depend() {
    need net postgresql
}

start_pre() {
    checkpath --directory --owner keycloak:keycloak --mode 0755 /var/run
}

Enable Keycloak:

sudo chmod +x /etc/init.d/keycloak
sudo rc-update add keycloak default
sudo rc-service keycloak start

Step 4: SAML 2.0 Implementation

Install SimpleSAMLphp

# Install PHP and required extensions
sudo apk add php8 php8-fpm php8-dom php8-xml php8-xmlreader
sudo apk add php8-session php8-openssl php8-mbstring
sudo apk add php8-curl php8-json php8-pdo php8-pdo_pgsql

# Download SimpleSAMLphp
cd /opt
sudo wget https://github.com/simplesamlphp/simplesamlphp/releases/download/v2.0.4/simplesamlphp-2.0.4.tar.gz
sudo tar -xzf simplesamlphp-2.0.4.tar.gz
sudo mv simplesamlphp-2.0.4 simplesamlphp

# Set permissions
sudo chown -R nginx:nginx /opt/simplesamlphp

Configure SimpleSAMLphp

# Copy default configuration
cd /opt/simplesamlphp
sudo cp config-templates/config.php config/config.php
sudo nano config/config.php

Edit configuration:

<?php

$config = [
    'baseurlpath' => '/simplesaml/',
    'certdir' => 'cert/',
    'loggingdir' => 'log/',
    'datadir' => 'data/',
    'tempdir' => '/tmp/simplesaml',

    'auth.adminpassword' => 'admin_secret_password',
    'secretsalt' => 'your-secret-salt-here',

    'technicalcontact_name' => 'Administrator',
    'technicalcontact_email' => '[email protected]',

    'timezone' => 'UTC',

    'store.type' => 'sql',
    'store.sql.dsn' => 'pgsql:host=localhost;port=5432;dbname=identity_system',
    'store.sql.username' => 'identity_user',
    'store.sql.password' => 'secure_password',

    'session.cookie.secure' => true,
    'session.cookie.samesite' => 'None',
];

Configure SAML Identity Provider

# Configure SAML IdP
sudo nano /opt/simplesamlphp/metadata/saml20-idp-hosted.php

Add IdP configuration:

<?php

$metadata['https://auth.yourdomain.com/saml'] = [
    'host' => '__DEFAULT__',
    'privatekey' => 'server.pem',
    'certificate' => 'server.crt',
    'auth' => 'example-userpass',
    
    'attributes.NameFormat' => 'urn:oasis:names:tc:SAML:2.0:attrname-format:uri',
    'NameIDFormat' => 'urn:oasis:names:tc:SAML:2.0:nameid-format:transient',
    
    'authproc' => [
        30 => 'core:LanguageAdaptor',
        45 => [
            'class' => 'core:StatisticsWithAttribute',
            'attributename' => 'realm',
            'type' => 'saml20-idp-SSO',
        ],
        50 => 'core:AttributeLimit',
        99 => 'core:LanguageAdaptor',
    ],
];

Step 5: LDAP Authentication Backend

Install OpenLDAP

# Install OpenLDAP
sudo apk add openldap openldap-back-mdb openldap-clients

# Configure LDAP
sudo nano /etc/openldap/slapd.conf

Add LDAP configuration:

# Schema includes
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema

# Process ID and arguments files
pidfile /var/run/openldap/slapd.pid
argsfile /var/run/openldap/slapd.args

# Database configuration
database mdb
suffix "dc=yourdomain,dc=com"
rootdn "cn=admin,dc=yourdomain,dc=com"
rootpw {SSHA}your-hashed-password-here

# Database directory
directory /var/lib/openldap/openldap-data

# Indices
index objectClass eq
index cn,sn,uid eq,sub
index mail eq,sub

# Access controls
access to attrs=userPassword
    by self write
    by anonymous auth
    by * none

access to *
    by self write
    by * read

Initialize LDAP Database

# Create LDAP directories
sudo mkdir -p /var/lib/openldap/openldap-data
sudo mkdir -p /var/run/openldap
sudo chown -R ldap:ldap /var/lib/openldap
sudo chown -R ldap:ldap /var/run/openldap

# Generate admin password
slappasswd

# Start LDAP service
sudo rc-update add slapd default
sudo rc-service slapd start

# Create base LDIF
nano base.ldif

Add base LDAP structure:

dn: dc=yourdomain,dc=com
objectClass: top
objectClass: domain
dc: yourdomain

dn: ou=people,dc=yourdomain,dc=com
objectClass: organizationalUnit
ou: people

dn: ou=groups,dc=yourdomain,dc=com
objectClass: organizationalUnit
ou: groups

dn: cn=admin,dc=yourdomain,dc=com
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
cn: admin
sn: Administrator
uid: admin
mail: [email protected]
userPassword: {SSHA}your-hashed-password-here

Import base structure:

ldapadd -x -D "cn=admin,dc=yourdomain,dc=com" -W -f base.ldif

Step 6: JWT Token Management

Create JWT Service

# Create JWT service directory
mkdir -p ~/identity-services/jwt-service
cd ~/identity-services/jwt-service

# Initialize Node.js project
npm init -y

# Install dependencies
npm install express jsonwebtoken bcryptjs cors helmet
npm install dotenv express-rate-limit express-validator

Implement JWT Service

# Create JWT service
nano server.js

Add JWT implementation:

const express = require('express');
const jwt = require('jsonwebtoken');
const bcrypt = require('bcryptjs');
const cors = require('cors');
const helmet = require('helmet');
const rateLimit = require('express-rate-limit');
const { body, validationResult } = require('express-validator');
require('dotenv').config();

const app = express();
const PORT = process.env.PORT || 3000;
const JWT_SECRET = process.env.JWT_SECRET || 'your-super-secret-key';

// Middleware
app.use(helmet());
app.use(cors());
app.use(express.json());

// Rate limiting
const limiter = rateLimit({
    windowMs: 15 * 60 * 1000, // 15 minutes
    max: 100 // limit each IP to 100 requests per windowMs
});
app.use(limiter);

// In-memory user store (replace with database in production)
const users = [
    {
        id: 1,
        username: 'admin',
        email: '[email protected]',
        password: '$2a$10$example.hashed.password.here'
    }
];

// Authentication middleware
const authenticateToken = (req, res, next) => {
    const authHeader = req.headers['authorization'];
    const token = authHeader && authHeader.split(' ')[1];

    if (!token) {
        return res.status(401).json({ error: 'Access denied. No token provided.' });
    }

    jwt.verify(token, JWT_SECRET, (err, user) => {
        if (err) {
            return res.status(403).json({ error: 'Invalid token.' });
        }
        req.user = user;
        next();
    });
};

// Routes
app.post('/auth/login', [
    body('username').isLength({ min: 3 }).trim().escape(),
    body('password').isLength({ min: 6 })
], async (req, res) => {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
        return res.status(400).json({ errors: errors.array() });
    }

    const { username, password } = req.body;
    
    // Find user
    const user = users.find(u => u.username === username);
    if (!user) {
        return res.status(401).json({ error: 'Invalid credentials' });
    }

    // Verify password
    const validPassword = await bcrypt.compare(password, user.password);
    if (!validPassword) {
        return res.status(401).json({ error: 'Invalid credentials' });
    }

    // Generate tokens
    const accessToken = jwt.sign(
        { id: user.id, username: user.username, email: user.email },
        JWT_SECRET,
        { expiresIn: '1h' }
    );

    const refreshToken = jwt.sign(
        { id: user.id, type: 'refresh' },
        JWT_SECRET,
        { expiresIn: '7d' }
    );

    res.json({
        accessToken,
        refreshToken,
        user: {
            id: user.id,
            username: user.username,
            email: user.email
        }
    });
});

app.post('/auth/refresh', (req, res) => {
    const { refreshToken } = req.body;
    
    if (!refreshToken) {
        return res.status(401).json({ error: 'Refresh token required' });
    }

    jwt.verify(refreshToken, JWT_SECRET, (err, decoded) => {
        if (err || decoded.type !== 'refresh') {
            return res.status(403).json({ error: 'Invalid refresh token' });
        }

        const user = users.find(u => u.id === decoded.id);
        if (!user) {
            return res.status(403).json({ error: 'User not found' });
        }

        const accessToken = jwt.sign(
            { id: user.id, username: user.username, email: user.email },
            JWT_SECRET,
            { expiresIn: '1h' }
        );

        res.json({ accessToken });
    });
});

app.get('/auth/verify', authenticateToken, (req, res) => {
    res.json({ valid: true, user: req.user });
});

app.get('/protected', authenticateToken, (req, res) => {
    res.json({ 
        message: 'This is a protected route',
        user: req.user 
    });
});

app.listen(PORT, () => {
    console.log(`JWT Service running on port ${PORT}`);
});

Create Environment Configuration

# Create environment file
nano .env

Add configuration:

PORT=3000
JWT_SECRET=your-super-secret-jwt-key-at-least-32-characters
NODE_ENV=production

Create JWT Service

# Create service script
sudo nano /etc/init.d/jwt-service

Add service configuration:

#!/sbin/openrc-run

name="jwt-service"
description="JWT Authentication Service"

user="nobody"
group="nobody"
command="/usr/bin/node"
command_args="/home/user/identity-services/jwt-service/server.js"
pidfile="/var/run/jwt-service.pid"
command_background="yes"

depend() {
    need net
}

start_pre() {
    cd /home/user/identity-services/jwt-service
}

Step 7: Identity Federation Hub

Create Identity Federation Service

# Create federation service
mkdir -p ~/identity-services/federation-hub
cd ~/identity-services/federation-hub

# Initialize project
npm init -y
npm install express passport passport-oauth2 passport-saml
npm install passport-ldapauth session-file-store express-session

Implement Federation Hub

# Create federation service
nano app.js

Add federation implementation:

const express = require('express');
const session = require('express-session');
const FileStore = require('session-file-store')(session);
const passport = require('passport');
const OAuth2Strategy = require('passport-oauth2');
const SamlStrategy = require('passport-saml').Strategy;
const LdapStrategy = require('passport-ldapauth');

const app = express();

// Session configuration
app.use(session({
    store: new FileStore(),
    secret: 'federation-secret-key',
    resave: false,
    saveUninitialized: false,
    cookie: { secure: false, maxAge: 3600000 }
}));

app.use(passport.initialize());
app.use(passport.session());

// Passport serialization
passport.serializeUser((user, done) => {
    done(null, user);
});

passport.deserializeUser((user, done) => {
    done(null, user);
});

// OAuth2 Strategy (for Hydra/Keycloak)
passport.use('oauth2', new OAuth2Strategy({
    authorizationURL: 'https://auth.yourdomain.com/oauth2/auth',
    tokenURL: 'https://auth.yourdomain.com/oauth2/token',
    clientID: 'federation-client',
    clientSecret: 'federation-secret',
    callbackURL: '/auth/oauth2/callback'
}, async (accessToken, refreshToken, profile, done) => {
    // Process OAuth2 user
    return done(null, { provider: 'oauth2', profile, accessToken });
}));

// SAML Strategy
passport.use('saml', new SamlStrategy({
    entryPoint: 'https://auth.yourdomain.com/saml/sso',
    issuer: 'federation-hub',
    callbackUrl: 'https://federation.yourdomain.com/auth/saml/callback',
    cert: 'path/to/saml/cert.pem'
}, (profile, done) => {
    return done(null, { provider: 'saml', profile });
}));

// LDAP Strategy
passport.use('ldap', new LdapStrategy({
    server: {
        url: 'ldap://localhost:389',
        bindDN: 'cn=admin,dc=yourdomain,dc=com',
        bindCredentials: 'admin_password',
        searchBase: 'ou=people,dc=yourdomain,dc=com',
        searchFilter: '(uid={{username}})'
    }
}, (user, done) => {
    return done(null, { provider: 'ldap', user });
}));

// Routes
app.get('/auth/oauth2', passport.authenticate('oauth2'));
app.get('/auth/oauth2/callback', 
    passport.authenticate('oauth2', { failureRedirect: '/login' }),
    (req, res) => res.redirect('/dashboard')
);

app.get('/auth/saml', passport.authenticate('saml'));
app.get('/auth/saml/callback',
    passport.authenticate('saml', { failureRedirect: '/login' }),
    (req, res) => res.redirect('/dashboard')
);

app.post('/auth/ldap',
    passport.authenticate('ldap', { failureRedirect: '/login' }),
    (req, res) => res.redirect('/dashboard')
);

app.get('/dashboard', (req, res) => {
    if (!req.isAuthenticated()) {
        return res.redirect('/login');
    }
    res.json({ user: req.user, message: 'Welcome to the federation hub!' });
});

app.listen(4000, () => {
    console.log('Federation Hub running on port 4000');
});

Step 8: Nginx Reverse Proxy Configuration

Configure Nginx for Identity Services

# Configure Nginx
sudo nano /etc/nginx/nginx.conf

Add proxy configuration:

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    # OAuth2/OIDC Proxy
    upstream hydra_public {
        server 127.0.0.1:4444;
    }

    upstream hydra_admin {
        server 127.0.0.1:4445;
    }

    upstream keycloak {
        server 127.0.0.1:8080;
    }

    upstream jwt_service {
        server 127.0.0.1:3000;
    }

    upstream federation_hub {
        server 127.0.0.1:4000;
    }

    # Main identity service
    server {
        listen 80;
        server_name auth.yourdomain.com;
        return 301 https://$server_name$request_uri;
    }

    server {
        listen 443 ssl http2;
        server_name auth.yourdomain.com;

        ssl_certificate /etc/ssl/certs/auth.yourdomain.com.pem;
        ssl_certificate_key /etc/ssl/private/auth.yourdomain.com.key;

        # OAuth2 endpoints
        location /oauth2/ {
            proxy_pass http://hydra_public/;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }

        # Keycloak
        location /realms/ {
            proxy_pass http://keycloak;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }

        # SAML endpoints
        location /simplesaml/ {
            root /opt/simplesamlphp/www;
            index index.php;
            
            location ~ \.php$ {
                fastcgi_pass unix:/var/run/php8-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                include fastcgi_params;
            }
        }

        # JWT service
        location /jwt/ {
            proxy_pass http://jwt_service/;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }
    }

    # Federation hub
    server {
        listen 443 ssl http2;
        server_name federation.yourdomain.com;

        ssl_certificate /etc/ssl/certs/federation.yourdomain.com.pem;
        ssl_certificate_key /etc/ssl/private/federation.yourdomain.com.key;

        location / {
            proxy_pass http://federation_hub;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
        }
    }
}

Step 9: Security and Monitoring

Set Up SSL Certificates

# Install certbot for Let's Encrypt
sudo apk add certbot certbot-nginx

# Generate certificates
sudo certbot --nginx -d auth.yourdomain.com
sudo certbot --nginx -d federation.yourdomain.com

# Auto-renewal
echo "0 12 * * * certbot renew --quiet" | sudo crontab -

Create Security Monitoring

# Create security monitoring script
sudo nano /usr/local/bin/identity-monitor.sh

Add monitoring script:

#!/bin/bash

LOG_FILE="/var/log/identity-security.log"

echo "=== Identity System Security Monitor ===" | tee -a $LOG_FILE
echo "Timestamp: $(date)" | tee -a $LOG_FILE

# Check failed login attempts
FAILED_OAUTH=$(grep "authentication failed" /var/log/nginx/access.log | tail -10 | wc -l)
if [ $FAILED_OAUTH -gt 5 ]; then
    echo "WARNING: High number of OAuth authentication failures: $FAILED_OAUTH" | tee -a $LOG_FILE
fi

# Check certificate expiration
CERT_DAYS=$(openssl x509 -in /etc/ssl/certs/auth.yourdomain.com.pem -noout -dates | grep notAfter | cut -d= -f2)
echo "Certificate expires: $CERT_DAYS" | tee -a $LOG_FILE

# Check service status
for service in hydra keycloak jwt-service; do
    if pgrep $service > /dev/null; then
        echo "✓ $service: Running" | tee -a $LOG_FILE
    else
        echo "✗ $service: Not running" | tee -a $LOG_FILE
    fi
done

# Database connection test
if pg_isready -h localhost -p 5432 > /dev/null; then
    echo "✓ PostgreSQL: Connected" | tee -a $LOG_FILE
else
    echo "✗ PostgreSQL: Connection failed" | tee -a $LOG_FILE
fi

echo "=== Monitor Complete ===" | tee -a $LOG_FILE

Set Up Rate Limiting and Security

# Install fail2ban
sudo apk add fail2ban

# Configure fail2ban for identity services
sudo nano /etc/fail2ban/jail.local

Add fail2ban configuration:

[DEFAULT]
bantime = 3600
findtime = 600
maxretry = 5

[nginx-auth]
enabled = true
filter = nginx-auth
logpath = /var/log/nginx/access.log
maxretry = 3
bantime = 7200

[hydra-auth]
enabled = true
filter = hydra-auth
logpath = /var/log/hydra/hydra.log
maxretry = 3
bantime = 3600

Conclusion

You’ve successfully implemented a comprehensive digital identity system on Alpine Linux! Your setup includes:

✅ OAuth 2.0 Server: Ory Hydra for authorization ✅ OpenID Connect Provider: Keycloak for authentication ✅ SAML 2.0 Support: SimpleSAMLphp for enterprise SSO ✅ LDAP Integration: OpenLDAP for directory services ✅ JWT Service: Custom token management ✅ Identity Federation: Multi-protocol identity hub ✅ Security Monitoring: Automated security checks ✅ SSL/TLS Termination: Nginx reverse proxy with HTTPS

Your identity system now supports:

• Single Sign-On (SSO) across multiple applications
• Multi-factor authentication
• Identity federation across organizations
• API authentication with JWT tokens
• Enterprise directory integration
• Secure token management

Remember to:

• Regularly update all identity services
• Monitor authentication logs for suspicious activity
• Backup identity databases and configurations
• Test disaster recovery procedures
• Review and update security policies

Your digital identity system is now ready to provide secure, scalable authentication for your applications! 🔐

Stay secure and protect your users’ digital identities! 🛡️