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TUN-9858: Remove proxy-dns feature from cloudflared

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Remove the DNS over HTTPS (DoH) proxy feature built on CoreDNS due to
security vulnerabilities (GO-2025-3942, GO-2026-4289).

This removes:
- Standalone proxy-dns command (cloudflared proxy-dns)
- Tunnel subcommand (cloudflared tunnel proxy-dns)
- Proxy-dns flags for tunnel run (--proxy-dns, --proxy-dns-port, etc.)
- Config file resolver section support
- tunneldns/ package (CoreDNS-based implementation)
- Related component tests

BREAKING CHANGE: The proxy-dns feature is no longer available.
Users should migrate to alternative DNS over HTTPS solutions.
This commit is contained in:
João "Pisco" Fernandes
2026-02-06 12:43:53 +00:00
parent d6cb78aeb4
commit 9388e7f48c
254 changed files with 80 additions and 49676 deletions
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.vulnignore
-2
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@@ -1,4 +1,2 @@
# Add vulnerability IDs (e.g., GO-2022-0450) to ignore, one per line.
# You can also add comments on the same line after the ID.
GO-2025-3942 # Ignore core-dns vulnerability since we will be removing the proxy-dns feature in the near future
GO-2026-4289 # Ignore core-dns vulnerability since we will be removing the proxy-dns feature in the near future