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Hides proxy protocol support behind a settings toggle and adds some implementation comments.

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This commit is contained in:
Erek Speed 2021-07-05 08:38:15 +09:00
parent ecab240817
commit 610300c2e4
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GPG key ID: 12933BB2EAD9F705
3 changed files with 50 additions and 30 deletions
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7
settings.sample.yaml
View file

@ -80,3 +80,10 @@ server_settings:
# 0 defaults to (2 * your available processors)
# https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Runtime.html#availableProcessors()
threads: 0
# Whether to enable support for HAProxy Proxy Protocol
# If using a reverse proxy to forward requests to MD@H via
# ssl passthrough, you can use Proxy Protocol to preserve
# original IP if your reverse proxy supports it. This
# will allow geo location metrics to work correctly.
# https://www.haproxy.com/blog/haproxy/proxy-protocol/
enable_proxy_protocol: false

72
src/main/kotlin/mdnet/netty/ApplicationNetty.kt
View file

@ -184,29 +184,35 @@ class Netty(
.childHandler(object : ChannelInitializer<SocketChannel>() {
val HAPROXY_SOURCE = AttributeKey.newInstance<String>("haproxy_source")
public override fun initChannel(ch: SocketChannel) {
ch.pipeline().addLast(
"proxyProtocol",
object : ChannelInboundHandlerAdapter() {
override fun channelRead(ctx: ChannelHandlerContext, msg: Any) {
if (msg is ByteBuf) {
val result: ProtocolDetectionResult<HAProxyProtocolVersion> = HAProxyMessageDecoder.detectProtocol(msg)
if (result.state() == ProtocolDetectionState.DETECTED) {
ctx.pipeline().addAfter("proxyProtocol", null, HAProxyMessageDecoder())
ctx.pipeline().remove(this)
if (serverSettings.enableProxyProtocol) {
ch.pipeline().addLast(
"proxyProtocol",
object : ChannelInboundHandlerAdapter() {
override fun channelRead(ctx: ChannelHandlerContext, msg: Any) {
if (msg is ByteBuf) {
// Since the builtin `HAProxyMessageDecoder` will break non Proxy Protocol requests
// we need to use its detection capabilities to only add it when needed.
val result: ProtocolDetectionResult<HAProxyProtocolVersion> = HAProxyMessageDecoder.detectProtocol(msg)
if (result.state() == ProtocolDetectionState.DETECTED) {
ctx.pipeline().addAfter("proxyProtocol", null, HAProxyMessageDecoder())
ctx.pipeline().remove(this)
}
}
super.channelRead(ctx, msg)
}
super.channelRead(ctx, msg)
}
}
)
ch.pipeline().addLast(
"saveOriginalIp",
object : SimpleChannelInboundHandler<HAProxyMessage>() {
override fun channelRead0(ctx: ChannelHandlerContext, msg: HAProxyMessage) {
(ctx as AttributeMap).attr(HAPROXY_SOURCE).set(msg.sourceAddress())
)
ch.pipeline().addLast(
"saveOriginalIp",
object : SimpleChannelInboundHandler<HAProxyMessage>() {
override fun channelRead0(ctx: ChannelHandlerContext, msg: HAProxyMessage) {
// Store proxy IP in an attribute for later use after HTTP request is extracted.
// Using an attribute ensures the value is scoped to this channel.
(ctx as AttributeMap).attr(HAPROXY_SOURCE).set(msg.sourceAddress())
}
}
}
)
)
}
ch.pipeline().addLast(
"ssl",
SniHandler(DomainWildcardMappingBuilder(sslContext).build())
@ -239,19 +245,25 @@ class Netty(
ch.pipeline().addLast("keepAlive", HttpServerKeepAliveHandler())
ch.pipeline().addLast("aggregator", HttpObjectAggregator(65536))
ch.pipeline().addLast(
"setForwardHeader",
object : SimpleChannelInboundHandler<FullHttpRequest>(false) {
override fun channelRead0(ctx: ChannelHandlerContext, request: FullHttpRequest) {
if ((ctx as AttributeMap).hasAttr(HAPROXY_SOURCE)) {
val addr = (ctx as AttributeMap).attr(HAPROXY_SOURCE).get()
request.headers().set("Forwarded", addr)
if (serverSettings.enableProxyProtocol) {
ch.pipeline().addLast(
"setForwardHeader",
object : SimpleChannelInboundHandler<FullHttpRequest>(false) {
override fun channelRead0(ctx: ChannelHandlerContext, request: FullHttpRequest) {
// The geo location code already supports the `Forwarded header so setting
// it is the easiest way to introduce the original IP downstream.
if ((ctx as AttributeMap).hasAttr(HAPROXY_SOURCE)) {
val addr = (ctx as AttributeMap).attr(HAPROXY_SOURCE).get()
request.headers().set("Forwarded", addr)
}
// Since we're modifying the request without handling it, we must
// call retain to ensure it will still be available downstream.
ReferenceCountUtil.retain(request)
ctx.fireChannelRead(request)
}
ReferenceCountUtil.retain(request)
ctx.fireChannelRead(request)
}
}
)
)
}
ch.pipeline().addLast("burstLimiter", burstLimiter)

1
src/main/kotlin/mdnet/settings/ClientSettings.kt
View file

@ -43,6 +43,7 @@ data class ServerSettings(
val externalIp: String? = null,
val port: Int = 443,
val threads: Int = 0,
val enableProxyProtocol: Boolean = false,
)
@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy::class)