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fix(tls): use Go TLS defaults (#8227)

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Remove fixed TLS 1.2 cipher suite list and maximum TLS version so
crypto/tls can use its maintained defaults. Keep TLS 1.2 as the
minimum supported version.

Document the shared TLS default behavior for plugins that expose TLS
configuration and add coverage to ensure CoreDNS leaves Go-managed
TLS fields unset.

Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
This commit is contained in:
Ville Vesilehto
2026-07-05 02:03:02 +03:00
committed by GitHub
parent 679f764ae1
commit bc4343b083
6 changed files with 44 additions and 16 deletions
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plugin/etcd/README.md
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@@ -55,6 +55,10 @@ etcd [ZONES...] {
* three arguments - path to cert PEM file, path to client private key PEM file, path to CA PEM
file - if the server certificate is not signed by a system-installed CA and client certificate
is needed.
CoreDNS sets the minimum TLS version to TLS 1.2. The maximum TLS version, TLS 1.2 cipher suites, and
key exchange mechanisms use the Go `crypto/tls` defaults.
* `min-lease-ttl` the minimum TTL for DNS records based on etcd lease duration. Accepts flexible time formats like '30', '30s', '5m', '1h', '2h30m'. Default: 30 seconds.
* `max-lease-ttl` the maximum TTL for DNS records based on etcd lease duration. Accepts flexible time formats like '30', '30s', '5m', '1h', '2h30m'. Default: 24 hours.