2 changed files with 436 additions and 409 deletions
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// 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" |
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"net/http" |
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"strconv" |
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"time" |
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"github.com/caddyserver/caddy/v2" |
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"github.com/caddyserver/caddy/v2/modules/caddytls" |
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"github.com/lucas-clemente/quic-go/http3" |
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"go.uber.org/zap" |
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) |
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func init() { |
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err := caddy.RegisterModule(App{}) |
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if err != nil { |
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caddy.Log().Fatal(err.Error()) |
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} |
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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.cookie.*}` | HTTP request cookie
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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.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.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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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 server. Once the grace period is over, connections will
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// be forcefully closed.
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GracePeriod caddy.Duration `json:"grace_period,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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servers []*http.Server |
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h3servers []*http3.Server |
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h3listeners []net.PacketConn |
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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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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.tlsApp = app.tlsApp |
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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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// 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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// 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.Info("enabling strict SNI-Host matching because TLS client auth is configured", |
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zap.String("server_name", srvName), |
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) |
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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", |
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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.([]interface{}) { |
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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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} |
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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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for srvName, srv := range app.Servers { |
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s := &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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} |
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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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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
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tlsCfg := srv.TLSConnPolicies.TLSConfig(app.ctx) |
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ln = tls.NewListener(ln, tlsCfg) |
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/////////
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// TODO: HTTP/3 support is experimental for now
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if srv.ExperimentalHTTP3 { |
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app.logger.Info("enabling experimental HTTP/3 listener", |
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zap.String("addr", hostport), |
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) |
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h3ln, err := caddy.ListenPacket("udp", hostport) |
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if err != nil { |
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return fmt.Errorf("getting HTTP/3 UDP listener: %v", err) |
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} |
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h3srv := &http3.Server{ |
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Server: &http.Server{ |
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Addr: hostport, |
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Handler: srv, |
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TLSConfig: tlsCfg, |
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}, |
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} |
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go h3srv.Serve(h3ln) |
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app.h3servers = append(app.h3servers, h3srv) |
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app.h3listeners = append(app.h3listeners, h3ln) |
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srv.h3server = h3srv |
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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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app.logger.Debug("starting server loop", |
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zap.String("address", lnAddr), |
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zap.Bool("http3", srv.ExperimentalHTTP3), |
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zap.Bool("tls", useTLS), |
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) |
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go s.Serve(ln) |
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app.servers = append(app.servers, s) |
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} |
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} |
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} |
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// finish automatic HTTPS by finally beginning
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// certificate management
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err := app.automaticHTTPSPhase2() |
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if err != nil { |
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return fmt.Errorf("finalizing automatic HTTPS: %v", err) |
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} |
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return nil |
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} |
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// Stop gracefully shuts down the HTTP server.
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func (app *App) Stop() error { |
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ctx := context.Background() |
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if app.GracePeriod > 0 { |
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var cancel context.CancelFunc |
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ctx, cancel = context.WithTimeout(ctx, time.Duration(app.GracePeriod)) |
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defer cancel() |
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} |
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for _, s := range app.servers { |
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err := s.Shutdown(ctx) |
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if err != nil { |
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return err |
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} |
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} |
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// close the http3 servers; it's unclear whether the bug reported in
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// https://github.com/caddyserver/caddy/pull/2727#issuecomment-526856566
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// was ever truly fixed, since it seemed racey/nondeterministic; but
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// recent tests in 2020 were unable to replicate the issue again after
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// repeated attempts (the bug manifested after a config reload; i.e.
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// reusing a http3 server or listener was problematic), but it seems
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// to be working fine now
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for _, s := range app.h3servers { |
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// TODO: CloseGracefully, once implemented upstream
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// (see https://github.com/lucas-clemente/quic-go/issues/2103)
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err := s.Close() |
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if err != nil { |
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return err |
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} |
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} |
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||||
|
// closing an http3.Server does not close their underlying listeners
|
||||
|
// since apparently the listener can be used both by servers and
|
||||
|
// clients at the same time; so we need to manually call Close()
|
||||
|
// on the underlying h3 listeners (see lucas-clemente/quic-go#2103)
|
||||
|
for _, pc := range app.h3listeners { |
||||
|
err := pc.Close() |
||||
|
if err != nil { |
||||
|
return err |
||||
|
} |
||||
|
} |
||||
|
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 |
||||
|
} |
||||
|
|
||||
|
// Interface guards
|
||||
|
var ( |
||||
|
_ caddy.App = (*App)(nil) |
||||
|
_ caddy.Provisioner = (*App)(nil) |
||||
|
_ caddy.Validator = (*App)(nil) |
||||
|
) |
Loading…
Reference in new issue