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kevinveenbirkenbachandClaude Opus 5
c55f508e05
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>
48 lines
2.8 KiB
Markdown
48 lines
2.8 KiB
Markdown
# sshd
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## Description
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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.
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## Overview
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- Renders `sshd_config.j2` into `/etc/ssh/sshd_config` with customizable options
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- Sets file ownership (`root:root`) and permissions (`0644`)
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- Automatically reloads and restarts the SSH service via a systemd handler
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- Uses a `run_once_sys_svc_sshd` fact to ensure idempotent execution
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Key variable: `SYS_SVC_SSHD_PASSWORD_AUTHENTICATION` (default: `false`) enables password authentication when explicitly required by controlled environments such as local E2E test targets.
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## Cosmos
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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).
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```mermaid
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flowchart LR
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subgraph role [sys-svc-sshd 💻]
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svc_svc_sshd["svc-sshd"]
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end
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```
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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`.
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## Features
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- **Templated Configuration:** Delivers a Jinja2-based `sshd_config` with variables for debug logging, PAM support, and password-auth overrides.
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- **Security Defaults:** Disables password authentication and root login; enforces public-key authentication; conditionally sets `LogLevel` to `DEBUG3` when `MODE_DEBUG` is true.
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- **Systemd Integration:** Handles daemon reload and service restart seamlessly on configuration changes.
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- **Idempotency:** Ensures tasks run only once per play by setting the `run_once_sys_svc_sshd` fact.
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## Further Resources
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- [sshd_config manual](https://man7.org/linux/man-pages/man5/sshd_config.5.html)
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- [Ansible Template Module](https://docs.ansible.com/ansible/latest/collections/ansible/builtin/template_module.html)
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- [Ansible handler best practices](https://docs.ansible.com/ansible/latest/user_guide/playbooks_handlers.html)
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- [OpenSSH security recommendations](https://www.openssh.com/security.html)
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## Credits
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Implemented by **[Kevin Veen-Birkenbach](https://www.veen.world)**.
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Part of the [Infinito.Nexus Project](https://s.infinito.nexus/code) and maintained by [Kevin Veen-Birkenbach](https://www.veen.world).
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Licensed under the [Infinito.Nexus Community License (Non-Commercial)](https://s.infinito.nexus/license).
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