security: Instructions file for Codex

AGENTS.md — OpenSearch Security Plugin

Guidance for AI coding agents working in this repository.

Keeping This File Up to Date

This file should be updated automatically as part of any change that affects the information documented here. Do not treat it as a separate maintenance task — include the AGENTS.md update in the same commit or PR as the relevant code change. Examples of changes that should trigger an update:

• Adding, removing, or renaming source packages or top-level directories
• Changing the build system, required JDK version, or key Gradle tasks
• Adding or retiring test suites or testing conventions
• Changing code style tooling or static analysis configuration
• Updating contribution workflows (branching strategy, backport process, commit conventions, etc.)
• Adding new security-specific patterns or constraints agents should be aware of

When in doubt, update the file.

Repository Overview

OpenSearch Security is a plugin that adds authentication, authorization, TLS encryption, audit logging, and multi-tenancy to OpenSearch. The plugin intercepts all requests at the REST and transport layers before they reach OpenSearch action handlers.

See docs/ARCHITECTURE.md for detailed flow diagrams.

Repository Structure

src/
  main/java/org/opensearch/security/
    action/         # Custom OpenSearch actions registered by the plugin
    auditlog/       # Audit and compliance logging framework
    auth/           # Authentication backends (basic, PKI, proxy, LDAP, Kerberos, JWT, OIDC, SAML)
    authtoken/      # On-behalf-of (OBO) token issuance for extensions
    compliance/     # Field-level security and compliance (GDPR/HIPAA/PCI/SOX) features
    configuration/  # Security index management, config hot-reload
    dlic/           # Dynamic configuration REST API (roles, users, role-mappings, etc.)
    filter/         # REST and transport request/response filter pipeline
    hasher/         # Password hashing utilities
    http/           # HTTP/HTTPS layer integration
    httpclient/     # Internal HTTP client for auth backend calls
    identity/       # Subject and identity abstractions
    opensaml/       # OpenSAML integration utilities
    privileges/     # Authorization engine (role evaluation, DLS/FLS)
    queries/        # DLS query building
    resources/      # Resource sharing and access control
    rest/           # REST action handlers and route registration
    securityconf/   # Security configuration model (roles, mappings, users)
    setting/        # Plugin settings definitions
    ssl/            # TLS configuration for transport and HTTP layers
    state/          # Cluster security state management
    support/        # Shared support utilities
    tools/          # Admin tools (securityadmin)
    transport/      # Transport layer interception and enforcement
    user/           # User model and attribute handling
    util/           # General utilities
  test/             # Unit tests
  integrationTest/  # Integration tests (require a running OpenSearch cluster)
spi/                # Security Plugin Interface — public extension points for other plugins
libs/
  opensaml/         # Vendored/shaded OpenSAML library
sample-resource-plugin/  # Example plugin using the resource-sharing SPI
config/             # Default demo configuration (certs, roles, users, mappings)
docs/               # Contributor guides (developer guide, architecture, triaging, resource sharing)
tools/              # Shell scripts: securityadmin.sh, install_demo_configuration.sh
scripts/            # CI/CD helper scripts
bwc-test/           # Backwards-compatibility tests
checkstyle/         # Checkstyle rule configuration
formatter/          # Eclipse JDT formatter configuration