mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-23 22:27:38 -05:00
551 lines
21 KiB
Go
551 lines
21 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyhttp
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net/http"
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"strconv"
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"sync"
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"time"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/modules/caddyevents"
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"github.com/caddyserver/caddy/v2/modules/caddytls"
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"go.uber.org/zap"
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/h2c"
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)
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func init() {
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caddy.RegisterModule(App{})
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}
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// App is a robust, production-ready HTTP server.
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//
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// HTTPS is enabled by default if host matchers with qualifying names are used
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// in any of routes; certificates are automatically provisioned and renewed.
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// Additionally, automatic HTTPS will also enable HTTPS for servers that listen
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// only on the HTTPS port but which do not have any TLS connection policies
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// defined by adding a good, default TLS connection policy.
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//
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// In HTTP routes, additional placeholders are available (replace any `*`):
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//
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// Placeholder | Description
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// ------------|---------------
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// `{http.request.body}` | The request body (⚠️ inefficient; use only for debugging)
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// `{http.request.cookie.*}` | HTTP request cookie
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// `{http.request.duration}` | Time up to now spent handling the request (after decoding headers from client)
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// `{http.request.duration_ms}` | Same as 'duration', but in milliseconds.
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// `{http.request.uuid}` | The request unique identifier
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// `{http.request.header.*}` | Specific request header field
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// `{http.request.host.labels.*}` | Request host labels (0-based from right); e.g. for foo.example.com: 0=com, 1=example, 2=foo
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// `{http.request.host}` | The host part of the request's Host header
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// `{http.request.hostport}` | The host and port from the request's Host header
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// `{http.request.method}` | The request method
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// `{http.request.orig_method}` | The request's original method
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// `{http.request.orig_uri.path.dir}` | The request's original directory
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// `{http.request.orig_uri.path.file}` | The request's original filename
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// `{http.request.orig_uri.path}` | The request's original path
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// `{http.request.orig_uri.query}` | The request's original query string (without `?`)
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// `{http.request.orig_uri}` | The request's original URI
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// `{http.request.port}` | The port part of the request's Host header
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// `{http.request.proto}` | The protocol of the request
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// `{http.request.remote.host}` | The host part of the remote client's address
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// `{http.request.remote.port}` | The port part of the remote client's address
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// `{http.request.remote}` | The address of the remote client
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// `{http.request.scheme}` | The request scheme
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// `{http.request.tls.version}` | The TLS version name
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// `{http.request.tls.cipher_suite}` | The TLS cipher suite
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// `{http.request.tls.resumed}` | The TLS connection resumed a previous connection
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// `{http.request.tls.proto}` | The negotiated next protocol
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// `{http.request.tls.proto_mutual}` | The negotiated next protocol was advertised by the server
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// `{http.request.tls.server_name}` | The server name requested by the client, if any
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// `{http.request.tls.client.fingerprint}` | The SHA256 checksum of the client certificate
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// `{http.request.tls.client.public_key}` | The public key of the client certificate.
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// `{http.request.tls.client.public_key_sha256}` | The SHA256 checksum of the client's public key.
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// `{http.request.tls.client.certificate_pem}` | The PEM-encoded value of the certificate.
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// `{http.request.tls.client.certificate_der_base64}` | The base64-encoded value of the certificate.
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// `{http.request.tls.client.issuer}` | The issuer DN of the client certificate
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// `{http.request.tls.client.serial}` | The serial number of the client certificate
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// `{http.request.tls.client.subject}` | The subject DN of the client certificate
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// `{http.request.tls.client.san.dns_names.*}` | SAN DNS names(index optional)
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// `{http.request.tls.client.san.emails.*}` | SAN email addresses (index optional)
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// `{http.request.tls.client.san.ips.*}` | SAN IP addresses (index optional)
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// `{http.request.tls.client.san.uris.*}` | SAN URIs (index optional)
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// `{http.request.uri.path.*}` | Parts of the path, split by `/` (0-based from left)
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// `{http.request.uri.path.dir}` | The directory, excluding leaf filename
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// `{http.request.uri.path.file}` | The filename of the path, excluding directory
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// `{http.request.uri.path}` | The path component of the request URI
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// `{http.request.uri.query.*}` | Individual query string value
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// `{http.request.uri.query}` | The query string (without `?`)
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// `{http.request.uri}` | The full request URI
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// `{http.response.header.*}` | Specific response header field
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// `{http.vars.*}` | Custom variables in the HTTP handler chain
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// `{http.shutting_down}` | True if the HTTP app is shutting down
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// `{http.time_until_shutdown}` | Time until HTTP server shutdown, if scheduled
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type App struct {
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// HTTPPort specifies the port to use for HTTP (as opposed to HTTPS),
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// which is used when setting up HTTP->HTTPS redirects or ACME HTTP
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// challenge solvers. Default: 80.
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HTTPPort int `json:"http_port,omitempty"`
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// HTTPSPort specifies the port to use for HTTPS, which is used when
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// solving the ACME TLS-ALPN challenges, or whenever HTTPS is needed
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// but no specific port number is given. Default: 443.
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HTTPSPort int `json:"https_port,omitempty"`
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// GracePeriod is how long to wait for active connections when shutting
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// down the servers. During the grace period, no new connections are
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// accepted, idle connections are closed, and active connections will
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// be given the full length of time to become idle and close.
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// Once the grace period is over, connections will be forcefully closed.
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// If zero, the grace period is eternal. Default: 0.
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GracePeriod caddy.Duration `json:"grace_period,omitempty"`
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// ShutdownDelay is how long to wait before initiating the grace
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// period. When this app is stopping (e.g. during a config reload or
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// process exit), all servers will be shut down. Normally this immediately
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// initiates the grace period. However, if this delay is configured, servers
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// will not be shut down until the delay is over. During this time, servers
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// continue to function normally and allow new connections. At the end, the
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// grace period will begin. This can be useful to allow downstream load
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// balancers time to move this instance out of the rotation without hiccups.
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//
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// When shutdown has been scheduled, placeholders {http.shutting_down} (bool)
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// and {http.time_until_shutdown} (duration) may be useful for health checks.
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ShutdownDelay caddy.Duration `json:"shutdown_delay,omitempty"`
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// Servers is the list of servers, keyed by arbitrary names chosen
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// at your discretion for your own convenience; the keys do not
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// affect functionality.
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Servers map[string]*Server `json:"servers,omitempty"`
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ctx caddy.Context
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logger *zap.Logger
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tlsApp *caddytls.TLS
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// used temporarily between phases 1 and 2 of auto HTTPS
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allCertDomains []string
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}
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// CaddyModule returns the Caddy module information.
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func (App) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http",
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New: func() caddy.Module { return new(App) },
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}
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}
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// Provision sets up the app.
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func (app *App) Provision(ctx caddy.Context) error {
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// store some references
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tlsAppIface, err := ctx.App("tls")
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if err != nil {
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return fmt.Errorf("getting tls app: %v", err)
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}
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app.tlsApp = tlsAppIface.(*caddytls.TLS)
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app.ctx = ctx
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app.logger = ctx.Logger(app)
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eventsAppIface, err := ctx.App("events")
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if err != nil {
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return fmt.Errorf("getting events app: %v", err)
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}
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repl := caddy.NewReplacer()
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// this provisions the matchers for each route,
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// and prepares auto HTTP->HTTPS redirects, and
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// is required before we provision each server
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err = app.automaticHTTPSPhase1(ctx, repl)
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if err != nil {
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return err
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}
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// prepare each server
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for srvName, srv := range app.Servers {
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srv.name = srvName
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srv.tlsApp = app.tlsApp
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srv.events = eventsAppIface.(*caddyevents.App)
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srv.ctx = ctx
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srv.logger = app.logger.Named("log")
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srv.errorLogger = app.logger.Named("log.error")
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srv.shutdownAtMu = new(sync.RWMutex)
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// only enable access logs if configured
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if srv.Logs != nil {
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srv.accessLogger = app.logger.Named("log.access")
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}
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// the Go standard library does not let us serve only HTTP/2 using
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// http.Server; we would probably need to write our own server
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if !srv.protocol("h1") && (srv.protocol("h2") || srv.protocol("h2c")) {
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return fmt.Errorf("server %s: cannot enable HTTP/2 or H2C without enabling HTTP/1.1; add h1 to protocols or remove h2/h2c", srvName)
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}
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// if no protocols configured explicitly, enable all except h2c
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if len(srv.Protocols) == 0 {
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srv.Protocols = []string{"h1", "h2", "h3"}
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}
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// if not explicitly configured by the user, disallow TLS
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// client auth bypass (domain fronting) which could
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// otherwise be exploited by sending an unprotected SNI
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// value during a TLS handshake, then putting a protected
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// domain in the Host header after establishing connection;
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// this is a safe default, but we allow users to override
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// it for example in the case of running a proxy where
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// domain fronting is desired and access is not restricted
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// based on hostname
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if srv.StrictSNIHost == nil && srv.hasTLSClientAuth() {
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app.logger.Warn("enabling strict SNI-Host enforcement because TLS client auth is configured",
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zap.String("server_id", srvName))
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trueBool := true
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srv.StrictSNIHost = &trueBool
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}
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// process each listener address
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for i := range srv.Listen {
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lnOut, err := repl.ReplaceOrErr(srv.Listen[i], true, true)
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if err != nil {
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return fmt.Errorf("server %s, listener %d: %v", srvName, i, err)
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}
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srv.Listen[i] = lnOut
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}
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// set up each listener modifier
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if srv.ListenerWrappersRaw != nil {
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vals, err := ctx.LoadModule(srv, "ListenerWrappersRaw")
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if err != nil {
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return fmt.Errorf("loading listener wrapper modules: %v", err)
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}
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var hasTLSPlaceholder bool
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for i, val := range vals.([]any) {
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if _, ok := val.(*tlsPlaceholderWrapper); ok {
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if i == 0 {
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// putting the tls placeholder wrapper first is nonsensical because
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// that is the default, implicit setting: without it, all wrappers
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// will go after the TLS listener anyway
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return fmt.Errorf("it is unnecessary to specify the TLS listener wrapper in the first position because that is the default")
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}
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if hasTLSPlaceholder {
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return fmt.Errorf("TLS listener wrapper can only be specified once")
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}
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hasTLSPlaceholder = true
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}
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srv.listenerWrappers = append(srv.listenerWrappers, val.(caddy.ListenerWrapper))
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}
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// if any wrappers were configured but the TLS placeholder wrapper is
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// absent, prepend it so all defined wrappers come after the TLS
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// handshake; this simplifies logic when starting the server, since we
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// can simply assume the TLS placeholder will always be there
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if !hasTLSPlaceholder && len(srv.listenerWrappers) > 0 {
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srv.listenerWrappers = append([]caddy.ListenerWrapper{new(tlsPlaceholderWrapper)}, srv.listenerWrappers...)
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}
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}
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// pre-compile the primary handler chain, and be sure to wrap it in our
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// route handler so that important security checks are done, etc.
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primaryRoute := emptyHandler
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if srv.Routes != nil {
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err := srv.Routes.ProvisionHandlers(ctx)
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if err != nil {
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return fmt.Errorf("server %s: setting up route handlers: %v", srvName, err)
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}
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primaryRoute = srv.Routes.Compile(emptyHandler)
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}
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srv.primaryHandlerChain = srv.wrapPrimaryRoute(primaryRoute)
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// pre-compile the error handler chain
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if srv.Errors != nil {
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err := srv.Errors.Routes.Provision(ctx)
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if err != nil {
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return fmt.Errorf("server %s: setting up server error handling routes: %v", srvName, err)
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}
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srv.errorHandlerChain = srv.Errors.Routes.Compile(errorEmptyHandler)
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}
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// prepare the TLS connection policies
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err = srv.TLSConnPolicies.Provision(ctx)
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if err != nil {
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return fmt.Errorf("server %s: setting up TLS connection policies: %v", srvName, err)
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}
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// if there is no idle timeout, set a sane default; users have complained
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// before that aggressive CDNs leave connections open until the server
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// closes them, so if we don't close them it leads to resource exhaustion
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if srv.IdleTimeout == 0 {
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srv.IdleTimeout = defaultIdleTimeout
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}
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}
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return nil
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}
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// Validate ensures the app's configuration is valid.
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func (app *App) Validate() error {
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// each server must use distinct listener addresses
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lnAddrs := make(map[string]string)
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for srvName, srv := range app.Servers {
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for _, addr := range srv.Listen {
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listenAddr, err := caddy.ParseNetworkAddress(addr)
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if err != nil {
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return fmt.Errorf("invalid listener address '%s': %v", addr, err)
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}
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// check that every address in the port range is unique to this server;
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// we do not use <= here because PortRangeSize() adds 1 to EndPort for us
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for i := uint(0); i < listenAddr.PortRangeSize(); i++ {
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addr := caddy.JoinNetworkAddress(listenAddr.Network, listenAddr.Host, strconv.Itoa(int(listenAddr.StartPort+i)))
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if sn, ok := lnAddrs[addr]; ok {
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return fmt.Errorf("server %s: listener address repeated: %s (already claimed by server '%s')", srvName, addr, sn)
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}
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lnAddrs[addr] = srvName
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}
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}
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}
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return nil
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}
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// Start runs the app. It finishes automatic HTTPS if enabled,
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// including management of certificates.
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func (app *App) Start() error {
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// get a logger compatible with http.Server
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serverLogger, err := zap.NewStdLogAt(app.logger.Named("stdlib"), zap.DebugLevel)
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if err != nil {
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return fmt.Errorf("failed to set up server logger: %v", err)
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}
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for srvName, srv := range app.Servers {
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srv.server = &http.Server{
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ReadTimeout: time.Duration(srv.ReadTimeout),
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ReadHeaderTimeout: time.Duration(srv.ReadHeaderTimeout),
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WriteTimeout: time.Duration(srv.WriteTimeout),
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IdleTimeout: time.Duration(srv.IdleTimeout),
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MaxHeaderBytes: srv.MaxHeaderBytes,
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Handler: srv,
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ErrorLog: serverLogger,
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}
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// disable HTTP/2, which we enabled by default during provisioning
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if !srv.protocol("h2") {
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srv.server.TLSNextProto = make(map[string]func(*http.Server, *tls.Conn, http.Handler))
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for _, cp := range srv.TLSConnPolicies {
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// the TLSConfig was already provisioned, so... manually remove it
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for i, np := range cp.TLSConfig.NextProtos {
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if np == "h2" {
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cp.TLSConfig.NextProtos = append(cp.TLSConfig.NextProtos[:i], cp.TLSConfig.NextProtos[i+1:]...)
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break
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}
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}
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// remove it from the parent connection policy too, just to keep things tidy
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for i, alpn := range cp.ALPN {
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if alpn == "h2" {
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cp.ALPN = append(cp.ALPN[:i], cp.ALPN[i+1:]...)
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break
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}
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}
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}
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}
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// this TLS config is used by the std lib to choose the actual TLS config for connections
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// by looking through the connection policies to find the first one that matches
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tlsCfg := srv.TLSConnPolicies.TLSConfig(app.ctx)
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// enable H2C if configured
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if srv.protocol("h2c") {
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h2server := &http2.Server{
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IdleTimeout: time.Duration(srv.IdleTimeout),
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}
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srv.server.Handler = h2c.NewHandler(srv, h2server)
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}
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for _, lnAddr := range srv.Listen {
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listenAddr, err := caddy.ParseNetworkAddress(lnAddr)
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if err != nil {
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return fmt.Errorf("%s: parsing listen address '%s': %v", srvName, lnAddr, err)
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}
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srv.addresses = append(srv.addresses, listenAddr)
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for portOffset := uint(0); portOffset < listenAddr.PortRangeSize(); portOffset++ {
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// create the listener for this socket
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hostport := listenAddr.JoinHostPort(portOffset)
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ln, err := caddy.Listen(listenAddr.Network, hostport)
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if err != nil {
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return fmt.Errorf("%s: listening on %s: %v", listenAddr.Network, hostport, err)
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}
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// wrap listener before TLS (up to the TLS placeholder wrapper)
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var lnWrapperIdx int
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for i, lnWrapper := range srv.listenerWrappers {
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if _, ok := lnWrapper.(*tlsPlaceholderWrapper); ok {
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lnWrapperIdx = i + 1 // mark the next wrapper's spot
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break
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}
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ln = lnWrapper.WrapListener(ln)
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}
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// enable TLS if there is a policy and if this is not the HTTP port
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useTLS := len(srv.TLSConnPolicies) > 0 && int(listenAddr.StartPort+portOffset) != app.httpPort()
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if useTLS {
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// create TLS listener - this enables and terminates TLS
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ln = tls.NewListener(ln, tlsCfg)
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// enable HTTP/3 if configured
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if srv.protocol("h3") {
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app.logger.Info("enabling HTTP/3 listener", zap.String("addr", hostport))
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if err := srv.serveHTTP3(hostport, tlsCfg); err != nil {
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return err
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}
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}
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}
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// finish wrapping listener where we left off before TLS
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for i := lnWrapperIdx; i < len(srv.listenerWrappers); i++ {
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ln = srv.listenerWrappers[i].WrapListener(ln)
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}
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// if binding to port 0, the OS chooses a port for us;
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// but the user won't know the port unless we print it
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if listenAddr.StartPort == 0 && listenAddr.EndPort == 0 {
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app.logger.Info("port 0 listener",
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zap.String("input_address", lnAddr),
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zap.String("actual_address", ln.Addr().String()),
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)
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}
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app.logger.Debug("starting server loop",
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zap.String("address", ln.Addr().String()),
|
|
zap.Bool("tls", useTLS),
|
|
zap.Bool("http3", srv.h3server != nil))
|
|
|
|
srv.listeners = append(srv.listeners, ln)
|
|
|
|
// enable HTTP/1 if configured
|
|
if srv.protocol("h1") {
|
|
//nolint:errcheck
|
|
go srv.server.Serve(ln)
|
|
}
|
|
}
|
|
}
|
|
|
|
srv.logger.Info("server running",
|
|
zap.String("name", srvName),
|
|
zap.Strings("protocols", srv.Protocols))
|
|
}
|
|
|
|
// finish automatic HTTPS by finally beginning
|
|
// certificate management
|
|
err = app.automaticHTTPSPhase2()
|
|
if err != nil {
|
|
return fmt.Errorf("finalizing automatic HTTPS: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Stop gracefully shuts down the HTTP server.
|
|
func (app *App) Stop() error {
|
|
ctx := context.Background()
|
|
|
|
// see if any listeners in our config will be closing or if they are continuing
|
|
// hrough a reload; because if any are closing, we will enforce shutdown delay
|
|
var delay bool
|
|
scheduledTime := time.Now().Add(time.Duration(app.ShutdownDelay))
|
|
if app.ShutdownDelay > 0 {
|
|
for _, server := range app.Servers {
|
|
for _, na := range server.addresses {
|
|
for _, addr := range na.Expand() {
|
|
if caddy.ListenerUsage(addr.Network, addr.JoinHostPort(0)) < 2 {
|
|
app.logger.Debug("listener closing and shutdown delay is configured", zap.String("address", addr.String()))
|
|
server.shutdownAtMu.Lock()
|
|
server.shutdownAt = scheduledTime
|
|
server.shutdownAtMu.Unlock()
|
|
delay = true
|
|
} else {
|
|
app.logger.Debug("shutdown delay configured but listener will remain open", zap.String("address", addr.String()))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// honor scheduled/delayed shutdown time
|
|
if delay {
|
|
app.logger.Debug("shutdown scheduled",
|
|
zap.Duration("delay_duration", time.Duration(app.ShutdownDelay)),
|
|
zap.Time("time", scheduledTime))
|
|
time.Sleep(time.Duration(app.ShutdownDelay))
|
|
}
|
|
|
|
// enforce grace period if configured
|
|
if app.GracePeriod > 0 {
|
|
var cancel context.CancelFunc
|
|
ctx, cancel = context.WithTimeout(ctx, time.Duration(app.GracePeriod))
|
|
defer cancel()
|
|
app.logger.Debug("servers shutting down; grace period initiated", zap.Duration("duration", time.Duration(app.GracePeriod)))
|
|
} else {
|
|
app.logger.Debug("servers shutting down with eternal grace period")
|
|
}
|
|
|
|
// shut down servers
|
|
for _, server := range app.Servers {
|
|
if err := server.server.Shutdown(ctx); err != nil {
|
|
app.logger.Error("server shutdown",
|
|
zap.Error(err),
|
|
zap.Strings("addresses", server.Listen))
|
|
}
|
|
|
|
if server.h3server != nil {
|
|
// TODO: CloseGracefully, once implemented upstream (see https://github.com/lucas-clemente/quic-go/issues/2103)
|
|
if err := server.h3server.Close(); err != nil {
|
|
app.logger.Error("HTTP/3 server shutdown",
|
|
zap.Error(err),
|
|
zap.Strings("addresses", server.Listen))
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (app *App) httpPort() int {
|
|
if app.HTTPPort == 0 {
|
|
return DefaultHTTPPort
|
|
}
|
|
return app.HTTPPort
|
|
}
|
|
|
|
func (app *App) httpsPort() int {
|
|
if app.HTTPSPort == 0 {
|
|
return DefaultHTTPSPort
|
|
}
|
|
return app.HTTPSPort
|
|
}
|
|
|
|
// defaultIdleTimeout is the default HTTP server timeout
|
|
// for closing idle connections; useful to avoid resource
|
|
// exhaustion behind hungry CDNs, for example (we've had
|
|
// several complaints without this).
|
|
const defaultIdleTimeout = caddy.Duration(5 * time.Minute)
|
|
|
|
// Interface guards
|
|
var (
|
|
_ caddy.App = (*App)(nil)
|
|
_ caddy.Provisioner = (*App)(nil)
|
|
_ caddy.Validator = (*App)(nil)
|
|
)
|