The TLS handshake failure on git.dev.cleveragents.com was caused by the
hostname being absent from the certificate's Subject Alternative Names
(SANs), or by SNI virtual-host misconfiguration on the server side.
This commit delivers the repository-side remediation:
- scripts/check-tls-cert.py: New TLS certificate health-check script.
Connects to a hostname, verifies the certificate's SANs include the
target hostname, checks expiry, and reports errors/warnings. Accepts
an injectable SSLContext for unit testing without real network access.
Supports wildcard SAN matching and configurable expiry warning threshold.
- docs/development/ops-runbook.md: New ops runbook documenting the full
certificate renewal procedure (Let's Encrypt/certbot and manual CA),
SNI misconfiguration diagnosis steps, expiry monitoring with cron, and
recommended alert thresholds (30/14/7/0 days).
- features/tls_certificate_check.feature: 14 Behave scenarios tagged
@tdd_issue @tdd_issue_1543 covering: missing SAN detection, valid SAN
acceptance, expired certificate detection, expiry warning threshold,
TLS handshake errors, connection timeouts, connection refused, wildcard
SAN matching, and _hostname_matches_san unit tests.
- features/steps/tls_certificate_check_steps.py: Step definitions for
the above feature, using unittest.mock to inject SSL contexts and
socket connections so no real network calls are made.
- mkdocs.yml: Added Ops Runbook to the Development section navigation.
The actual server-side certificate renewal (adding git.dev.cleveragents.com
as a SAN and reloading the web server) must be performed by the server
administrator following the procedure in docs/development/ops-runbook.md.
Closes#1543
ISSUES CLOSED: #1543
freemo