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kevinveenbirkenbachandClaude Opus 5 c55f508e05 feat(readme): draw mandatory and disabled service relations

The cosmos generator linked a consumer to its provider only through an
'<role>' in group_names reference or an explicit provides: name. A hard
dependency has neither -- pinning the provider on unconditionally is
exactly what removes the Jinja reference the generator was reading -- so
web-svc-asset's bond to web-svc-file vanished from the diagram the moment
it became binding. Match a service key against the provider's own primary
key from the registry, in both directions.

Services the role turns off drew a solid 1:1 edge, claiming a mandatory
relationship for something that carries nothing at deploy time. They now
render as a red 0..0 edge; edge merging gained a real precedence so a
provider consumed through two keys stays live when only one is off.

Named colour, not hex: a '#' opens an entity code in the mermaid lexer and
turns the whole diagram into a parse error on GitHub.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-17 18:02:31 +02:00

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sshd

Description

This Ansible role configures the OpenSSH daemon (sshd) by deploying a templated sshd_config file. It applies secure, best-practice settings to harden remote access and reduce the risk of misconfiguration or lockout. Settings include disabling root login, enforcing public-key authentication, and setting appropriate logging levels.

Overview

Renders sshd_config.j2 into /etc/ssh/sshd_config with customizable options
Sets file ownership (root:root) and permissions (0644)
Automatically reloads and restarts the SSH service via a systemd handler
Uses a run_once_sys_svc_sshd fact to ensure idempotent execution

Key variable: SYS_SVC_SSHD_PASSWORD_AUTHENTICATION (default: false) enables password authentication when explicitly required by controlled environments such as local E2E test targets.

Cosmos

The diagram places sshd in the Infinito.Nexus cosmos: the components it deploys (capabilities), the central services it consumes (dependencies), and its outward reach (federation and bridged external networks).

flowchart LR
    subgraph role [sys-svc-sshd 💻]
        svc_svc_sshd["svc-sshd"]
    end

Solid 1:1 edges are fixed relationships; dashed 0..1 edges are conditional (enabled only in matching deployments); red 0..0 edges are turned off in this role. Node markers show the role's deploy modes (💻 host, 🐳 compose, 🐝 swarm); ❌ marks a service that is explicitly turned off, and ⚙️ an Ansible role dependency declared in meta/main.yml.

Features

Templated Configuration: Delivers a Jinja2-based sshd_config with variables for debug logging, PAM support, and password-auth overrides.
Security Defaults: Disables password authentication and root login; enforces public-key authentication; conditionally sets LogLevel to DEBUG3 when MODE_DEBUG is true.
Systemd Integration: Handles daemon reload and service restart seamlessly on configuration changes.
Idempotency: Ensures tasks run only once per play by setting the run_once_sys_svc_sshd fact.

Further Resources

Credits

Implemented by Kevin Veen-Birkenbach. Part of the Infinito.Nexus Project and maintained by Kevin Veen-Birkenbach. Licensed under the Infinito.Nexus Community License (Non-Commercial).

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