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topic (iac): [secure-hybrid-network] tighten firewall application rules#266

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ferantivero wants to merge 2 commits into
patch/421252_fix-subnet-sizingfrom
topic/421252_tighten-fw-rules
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topic (iac): [secure-hybrid-network] tighten firewall application rules#266
ferantivero wants to merge 2 commits into
patch/421252_fix-subnet-sizingfrom
topic/421252_tighten-fw-rules

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@ferantivero
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Why

The firewall allows all outbound HTTP/HTTPS to any FQDN from any source — a reference implementation should demonstrate least-privilege.

What

  • Replace all-internet rule (HTTP/HTTPS to * from *) with windows-update rule
  • Restrict to *.update.microsoft.com, *.windowsupdate.com, *.download.windowsupdate.com
  • Limit source to spoke address prefix only

Test

  • Bicep compiles without errors

ferantivero and others added 2 commits May 18, 2026 11:31
Replace overly permissive allow-all rule (targetFqdns: '*',
sourceAddresses: '*') with a scoped rule allowing only Windows
Update FQDNs from the spoke network prefix.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…en2 (#267)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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