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[Security] Add explicit egress policy to calendar sync URL fetches #12

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opened 2026-07-11 12:51:17 +02:00 by zemion · 1 comment
zemion commented 2026-07-11 12:51:17 +02:00
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The full audit confirms the existing calendar egress concern: CalDAV/ICS/EWS/Graph sync performs dynamic outbound URL requests. Some URLs are admin-configured, but there is no shared egress policy yet.

Classification: structural security work.

Report evidence:

  • govoplan-calendar/src/govoplan_calendar/backend/caldav.py:313.
  • govoplan-calendar/src/govoplan_calendar/backend/service.py:752.
  • Bandit: B310; Semgrep: dynamic-urllib-use-detected.
  • Related existing issue: govoplan-calendar#8.

Suggested next steps:

  • Define calendar sync source URL policy: HTTP(S)-only, private network policy, redirect policy, timeout and size limits, optional allowlists.
  • Use the policy before CalDAV/ICS/EWS requests.
  • Add narrow scanner annotations after policy enforcement.

Baseline report directory: audit-reports/govoplan-full-20260711-1238

<!-- codex-audit-full-2026-07-11:calendar-egress-audit --> The full audit confirms the existing calendar egress concern: CalDAV/ICS/EWS/Graph sync performs dynamic outbound URL requests. Some URLs are admin-configured, but there is no shared egress policy yet. Classification: **structural security work**. Report evidence: - `govoplan-calendar/src/govoplan_calendar/backend/caldav.py:313`. - `govoplan-calendar/src/govoplan_calendar/backend/service.py:752`. - Bandit: `B310`; Semgrep: `dynamic-urllib-use-detected`. - Related existing issue: `govoplan-calendar#8`. Suggested next steps: - Define calendar sync source URL policy: HTTP(S)-only, private network policy, redirect policy, timeout and size limits, optional allowlists. - Use the policy before CalDAV/ICS/EWS requests. - Add narrow scanner annotations after policy enforcement. Baseline report directory: `audit-reports/govoplan-full-20260711-1238`
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type
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priority
p1
module/calendar
status
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codex/ready
 labels 2026-07-11 12:51:17 +02:00
zemion commented 2026-07-11 12:51:47 +02:00
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Closing as duplicate of existing govoplan-calendar#8. Full-audit evidence has been posted there.

Closing as duplicate of existing `govoplan-calendar#8`. Full-audit evidence has been posted there.
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Reference: add-ideas/govoplan-calendar#12
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