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Add configurable resource limits to prevent potential DoS vectors via connection/stream exhaustion on gRPC, HTTPS, and HTTPS/3 servers. New configuration plugins: - grpc_server: configure max_streams, max_connections - https: configure max_connections - https3: configure max_streams Changes: - Use netutil.LimitListener for connection limiting - Use gRPC MaxConcurrentStreams and message size limits - Add QUIC MaxIncomingStreams for HTTPS/3 stream limiting - Set secure defaults: 256 max streams, 200 max connections - Setting any limit to 0 means unbounded/fallback to previous impl Defaults are applied automatically when plugins are omitted from config. Includes tests and integration tests. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
48 lines
1.0 KiB
Markdown
48 lines
1.0 KiB
Markdown
# https3
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## Name
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*https3* - configures DNS-over-HTTPS/3 (DoH3) server options.
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## Description
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The *https3* plugin allows you to configure parameters for the DNS-over-HTTPS/3 (DoH3) server to fine-tune the security posture and performance of the server. HTTPS/3 uses QUIC as the underlying transport.
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This plugin can only be used once per HTTPS3 listener block.
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## Syntax
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```txt
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https3 {
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max_streams POSITIVE_INTEGER
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}
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```
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* `max_streams` limits the number of concurrent QUIC streams per connection. This helps prevent unbounded streams on a single connection, exhausting server resources. The default value is 256 if not specified. Set to 0 to use underlying QUIC transport default.
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## Examples
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Set custom limits for maximum streams:
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```
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https3://.:443 {
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tls cert.pem key.pem
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https3 {
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max_streams 50
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}
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whoami
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}
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```
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Set values to 0 for QUIC transport default, matching CoreDNS behaviour before v1.14.0:
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```
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https3://.:443 {
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tls cert.pem key.pem
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https3 {
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max_streams 0
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}
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whoami
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}
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```
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