mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-16 21:56:40 -05:00
1c17e6c6bb
An upstream like https://localhost:80 is still forbidden, but an addr of localhost:80 can be used while explicitly enabling TLS as an override; we just don't allow the implicit behavior to be ambiguous.
724 lines
20 KiB
Go
724 lines
20 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 reverseproxy
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import (
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"net"
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"net/http"
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"net/url"
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"reflect"
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"strconv"
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"strings"
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"time"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig"
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"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
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"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
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"github.com/dustin/go-humanize"
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)
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func init() {
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httpcaddyfile.RegisterHandlerDirective("reverse_proxy", parseCaddyfile)
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}
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func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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rp := new(Handler)
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err := rp.UnmarshalCaddyfile(h.Dispenser)
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if err != nil {
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return nil, err
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}
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return rp, nil
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}
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// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
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//
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// reverse_proxy [<matcher>] [<upstreams...>] {
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// # upstreams
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// to <upstreams...>
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//
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// # load balancing
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// lb_policy <name> [<options...>]
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// lb_try_duration <duration>
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// lb_try_interval <interval>
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//
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// # active health checking
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// health_path <path>
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// health_port <port>
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// health_interval <interval>
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// health_timeout <duration>
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// health_status <status>
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// health_body <regexp>
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//
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// # passive health checking
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// max_fails <num>
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// fail_duration <duration>
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// max_conns <num>
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// unhealthy_status <status>
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// unhealthy_latency <duration>
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//
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// # streaming
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// flush_interval <duration>
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//
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// # header manipulation
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// header_up [+|-]<field> [<value|regexp> [<replacement>]]
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// header_down [+|-]<field> [<value|regexp> [<replacement>]]
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//
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// # round trip
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// transport <name> {
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// ...
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// }
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// }
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//
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// Proxy upstream addresses should be network dial addresses such
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// as `host:port`, or a URL such as `scheme://host:port`. Scheme
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// and port may be inferred from other parts of the address/URL; if
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// either are missing, defaults to HTTP.
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func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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// currently, all backends must use the same scheme/protocol (the
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// underlying JSON does not yet support per-backend transports)
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var commonScheme string
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// we'll wait until the very end of parsing before
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// validating and encoding the transport
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var transport http.RoundTripper
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var transportModuleName string
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// TODO: the logic in this function is kind of sensitive, we need
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// to write tests before making any more changes to it
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upstreamDialAddress := func(upstreamAddr string) (string, error) {
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var network, scheme, host, port string
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if strings.Contains(upstreamAddr, "://") {
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toURL, err := url.Parse(upstreamAddr)
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if err != nil {
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return "", d.Errf("parsing upstream URL: %v", err)
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}
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// there is currently no way to perform a URL rewrite between choosing
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// a backend and proxying to it, so we cannot allow extra components
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// in backend URLs
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if toURL.Path != "" || toURL.RawQuery != "" || toURL.Fragment != "" {
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return "", d.Err("for now, URLs for proxy upstreams only support scheme, host, and port components")
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}
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// ensure the port and scheme aren't in conflict
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urlPort := toURL.Port()
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if toURL.Scheme == "http" && urlPort == "443" {
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return "", d.Err("upstream address has conflicting scheme (http://) and port (:443, the HTTPS port)")
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}
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if toURL.Scheme == "https" && urlPort == "80" {
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return "", d.Err("upstream address has conflicting scheme (https://) and port (:80, the HTTP port)")
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}
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// if port is missing, attempt to infer from scheme
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if toURL.Port() == "" {
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var toPort string
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switch toURL.Scheme {
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case "", "http":
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toPort = "80"
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case "https":
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toPort = "443"
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}
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toURL.Host = net.JoinHostPort(toURL.Hostname(), toPort)
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}
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scheme, host, port = toURL.Scheme, toURL.Hostname(), toURL.Port()
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} else {
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// extract network manually, since caddy.ParseNetworkAddress() will always add one
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if idx := strings.Index(upstreamAddr, "/"); idx >= 0 {
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network = strings.ToLower(strings.TrimSpace(upstreamAddr[:idx]))
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upstreamAddr = upstreamAddr[idx+1:]
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}
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var err error
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host, port, err = net.SplitHostPort(upstreamAddr)
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if err != nil {
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host = upstreamAddr
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}
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}
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// the underlying JSON does not yet support different
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// transports (protocols or schemes) to each backend,
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// so we remember the last one we see and compare them
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if commonScheme != "" && scheme != commonScheme {
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return "", d.Errf("for now, all proxy upstreams must use the same scheme (transport protocol); expecting '%s://' but got '%s://'",
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commonScheme, scheme)
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}
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commonScheme = scheme
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// for simplest possible config, we only need to include
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// the network portion if the user specified one
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if network != "" {
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return caddy.JoinNetworkAddress(network, host, port), nil
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}
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return net.JoinHostPort(host, port), nil
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}
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// appendUpstream creates an upstream for address and adds
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// it to the list. If the address starts with "srv+" it is
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// treated as a SRV-based upstream, and any port will be
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// dropped.
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appendUpstream := func(address string) error {
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isSRV := strings.HasPrefix(address, "srv+")
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if isSRV {
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address = strings.TrimPrefix(address, "srv+")
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}
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dialAddr, err := upstreamDialAddress(address)
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if err != nil {
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return err
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}
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if isSRV {
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if host, _, err := net.SplitHostPort(dialAddr); err == nil {
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dialAddr = host
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}
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h.Upstreams = append(h.Upstreams, &Upstream{LookupSRV: dialAddr})
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} else {
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h.Upstreams = append(h.Upstreams, &Upstream{Dial: dialAddr})
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}
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return nil
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}
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for d.Next() {
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for _, up := range d.RemainingArgs() {
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err := appendUpstream(up)
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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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for d.NextBlock(0) {
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switch d.Val() {
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case "to":
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args := d.RemainingArgs()
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if len(args) == 0 {
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return d.ArgErr()
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}
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for _, up := range args {
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err := appendUpstream(up)
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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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case "lb_policy":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.LoadBalancing != nil && h.LoadBalancing.SelectionPolicyRaw != nil {
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return d.Err("load balancing selection policy already specified")
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}
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name := d.Val()
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mod, err := caddy.GetModule("http.reverse_proxy.selection_policies." + name)
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if err != nil {
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return d.Errf("getting load balancing policy module '%s': %v", mod, err)
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}
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unm, ok := mod.New().(caddyfile.Unmarshaler)
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if !ok {
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return d.Errf("load balancing policy module '%s' is not a Caddyfile unmarshaler", mod)
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}
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err = unm.UnmarshalCaddyfile(d.NewFromNextSegment())
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if err != nil {
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return err
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}
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sel, ok := unm.(Selector)
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if !ok {
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return d.Errf("module %s is not a Selector", mod)
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}
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if h.LoadBalancing == nil {
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h.LoadBalancing = new(LoadBalancing)
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}
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h.LoadBalancing.SelectionPolicyRaw = caddyconfig.JSONModuleObject(sel, "policy", name, nil)
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case "lb_try_duration":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.LoadBalancing == nil {
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h.LoadBalancing = new(LoadBalancing)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad duration value %s: %v", d.Val(), err)
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}
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h.LoadBalancing.TryDuration = caddy.Duration(dur)
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case "lb_try_interval":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.LoadBalancing == nil {
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h.LoadBalancing = new(LoadBalancing)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad interval value '%s': %v", d.Val(), err)
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}
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h.LoadBalancing.TryInterval = caddy.Duration(dur)
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case "health_path":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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h.HealthChecks.Active.Path = d.Val()
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case "health_port":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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portNum, err := strconv.Atoi(d.Val())
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if err != nil {
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return d.Errf("bad port number '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Active.Port = portNum
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case "health_interval":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad interval value %s: %v", d.Val(), err)
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}
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h.HealthChecks.Active.Interval = caddy.Duration(dur)
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case "health_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value %s: %v", d.Val(), err)
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}
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h.HealthChecks.Active.Timeout = caddy.Duration(dur)
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case "health_status":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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val := d.Val()
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if len(val) == 3 && strings.HasSuffix(val, "xx") {
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val = val[:1]
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}
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statusNum, err := strconv.Atoi(val[:1])
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if err != nil {
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return d.Errf("bad status value '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Active.ExpectStatus = statusNum
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case "health_body":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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h.HealthChecks.Active.ExpectBody = d.Val()
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case "max_fails":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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maxFails, err := strconv.Atoi(d.Val())
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if err != nil {
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return d.Errf("invalid maximum fail count '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.MaxFails = maxFails
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case "fail_duration":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad duration value '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.FailDuration = caddy.Duration(dur)
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case "unhealthy_request_count":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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maxConns, err := strconv.Atoi(d.Val())
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if err != nil {
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return d.Errf("invalid maximum connection count '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.UnhealthyRequestCount = maxConns
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|
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case "unhealthy_status":
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args := d.RemainingArgs()
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if len(args) == 0 {
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return d.ArgErr()
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}
|
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
|
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
|
|
for _, arg := range args {
|
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if len(arg) == 3 && strings.HasSuffix(arg, "xx") {
|
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arg = arg[:1]
|
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}
|
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statusNum, err := strconv.Atoi(arg[:1])
|
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if err != nil {
|
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return d.Errf("bad status value '%s': %v", d.Val(), err)
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}
|
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h.HealthChecks.Passive.UnhealthyStatus = append(h.HealthChecks.Passive.UnhealthyStatus, statusNum)
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}
|
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|
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case "unhealthy_latency":
|
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if !d.NextArg() {
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return d.ArgErr()
|
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}
|
|
if h.HealthChecks == nil {
|
|
h.HealthChecks = new(HealthChecks)
|
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}
|
|
if h.HealthChecks.Passive == nil {
|
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h.HealthChecks.Passive = new(PassiveHealthChecks)
|
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}
|
|
dur, err := time.ParseDuration(d.Val())
|
|
if err != nil {
|
|
return d.Errf("bad duration value '%s': %v", d.Val(), err)
|
|
}
|
|
h.HealthChecks.Passive.UnhealthyLatency = caddy.Duration(dur)
|
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|
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case "flush_interval":
|
|
if !d.NextArg() {
|
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return d.ArgErr()
|
|
}
|
|
if fi, err := strconv.Atoi(d.Val()); err == nil {
|
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h.FlushInterval = caddy.Duration(fi)
|
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} else {
|
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dur, err := time.ParseDuration(d.Val())
|
|
if err != nil {
|
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return d.Errf("bad duration value '%s': %v", d.Val(), err)
|
|
}
|
|
h.FlushInterval = caddy.Duration(dur)
|
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}
|
|
|
|
case "header_up":
|
|
if h.Headers == nil {
|
|
h.Headers = new(headers.Handler)
|
|
}
|
|
if h.Headers.Request == nil {
|
|
h.Headers.Request = new(headers.HeaderOps)
|
|
}
|
|
args := d.RemainingArgs()
|
|
switch len(args) {
|
|
case 1:
|
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headers.CaddyfileHeaderOp(h.Headers.Request, args[0], "", "")
|
|
case 2:
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|
headers.CaddyfileHeaderOp(h.Headers.Request, args[0], args[1], "")
|
|
case 3:
|
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headers.CaddyfileHeaderOp(h.Headers.Request, args[0], args[1], args[2])
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|
default:
|
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return d.ArgErr()
|
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}
|
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|
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case "header_down":
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if h.Headers == nil {
|
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h.Headers = new(headers.Handler)
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|
}
|
|
if h.Headers.Response == nil {
|
|
h.Headers.Response = &headers.RespHeaderOps{
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HeaderOps: new(headers.HeaderOps),
|
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}
|
|
}
|
|
args := d.RemainingArgs()
|
|
switch len(args) {
|
|
case 1:
|
|
headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], "", "")
|
|
case 2:
|
|
headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], args[1], "")
|
|
case 3:
|
|
headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], args[1], args[2])
|
|
default:
|
|
return d.ArgErr()
|
|
}
|
|
|
|
case "transport":
|
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if !d.NextArg() {
|
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return d.ArgErr()
|
|
}
|
|
if h.TransportRaw != nil {
|
|
return d.Err("transport already specified")
|
|
}
|
|
transportModuleName = d.Val()
|
|
mod, err := caddy.GetModule("http.reverse_proxy.transport." + transportModuleName)
|
|
if err != nil {
|
|
return d.Errf("getting transport module '%s': %v", mod, err)
|
|
}
|
|
unm, ok := mod.New().(caddyfile.Unmarshaler)
|
|
if !ok {
|
|
return d.Errf("transport module '%s' is not a Caddyfile unmarshaler", mod)
|
|
}
|
|
err = unm.UnmarshalCaddyfile(d.NewFromNextSegment())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
rt, ok := unm.(http.RoundTripper)
|
|
if !ok {
|
|
return d.Errf("module %s is not a RoundTripper", mod)
|
|
}
|
|
transport = rt
|
|
|
|
default:
|
|
return d.Errf("unrecognized subdirective %s", d.Val())
|
|
}
|
|
}
|
|
}
|
|
|
|
// if the scheme inferred from the backends' addresses is
|
|
// HTTPS, we will need a non-nil transport to enable TLS
|
|
if commonScheme == "https" && transport == nil {
|
|
transport = new(HTTPTransport)
|
|
transportModuleName = "http"
|
|
}
|
|
|
|
// verify transport configuration, and finally encode it
|
|
if transport != nil {
|
|
if te, ok := transport.(TLSTransport); ok {
|
|
if commonScheme == "https" && !te.TLSEnabled() {
|
|
err := te.EnableTLS(new(TLSConfig))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if commonScheme == "http" && te.TLSEnabled() {
|
|
return d.Errf("upstream address scheme is HTTP but transport is configured for HTTP+TLS (HTTPS)")
|
|
}
|
|
} else if commonScheme == "https" {
|
|
return d.Errf("upstreams are configured for HTTPS but transport module does not support TLS: %T", transport)
|
|
}
|
|
if !reflect.DeepEqual(transport, reflect.New(reflect.TypeOf(transport).Elem()).Interface()) {
|
|
h.TransportRaw = caddyconfig.JSONModuleObject(transport, "protocol", transportModuleName, nil)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// UnmarshalCaddyfile deserializes Caddyfile tokens into h.
|
|
//
|
|
// transport http {
|
|
// read_buffer <size>
|
|
// write_buffer <size>
|
|
// dial_timeout <duration>
|
|
// tls_client_auth <cert_file> <key_file>
|
|
// tls_insecure_skip_verify
|
|
// tls_timeout <duration>
|
|
// tls_trusted_ca_certs <cert_files...>
|
|
// keepalive [off|<duration>]
|
|
// keepalive_idle_conns <max_count>
|
|
// versions <versions...>
|
|
// }
|
|
//
|
|
func (h *HTTPTransport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
|
|
for d.Next() {
|
|
for d.NextBlock(0) {
|
|
switch d.Val() {
|
|
case "read_buffer":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
size, err := humanize.ParseBytes(d.Val())
|
|
if err != nil {
|
|
return d.Errf("invalid read buffer size '%s': %v", d.Val(), err)
|
|
}
|
|
h.ReadBufferSize = int(size)
|
|
|
|
case "write_buffer":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
size, err := humanize.ParseBytes(d.Val())
|
|
if err != nil {
|
|
return d.Errf("invalid write buffer size '%s': %v", d.Val(), err)
|
|
}
|
|
h.WriteBufferSize = int(size)
|
|
|
|
case "dial_timeout":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
dur, err := time.ParseDuration(d.Val())
|
|
if err != nil {
|
|
return d.Errf("bad timeout value '%s': %v", d.Val(), err)
|
|
}
|
|
h.DialTimeout = caddy.Duration(dur)
|
|
|
|
case "tls_client_auth":
|
|
args := d.RemainingArgs()
|
|
if len(args) != 2 {
|
|
return d.ArgErr()
|
|
}
|
|
if h.TLS == nil {
|
|
h.TLS = new(TLSConfig)
|
|
}
|
|
h.TLS.ClientCertificateFile = args[0]
|
|
h.TLS.ClientCertificateKeyFile = args[1]
|
|
|
|
case "tls":
|
|
if h.TLS == nil {
|
|
h.TLS = new(TLSConfig)
|
|
}
|
|
|
|
case "tls_insecure_skip_verify":
|
|
if d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
if h.TLS == nil {
|
|
h.TLS = new(TLSConfig)
|
|
}
|
|
h.TLS.InsecureSkipVerify = true
|
|
|
|
case "tls_timeout":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
dur, err := time.ParseDuration(d.Val())
|
|
if err != nil {
|
|
return d.Errf("bad timeout value '%s': %v", d.Val(), err)
|
|
}
|
|
if h.TLS == nil {
|
|
h.TLS = new(TLSConfig)
|
|
}
|
|
h.TLS.HandshakeTimeout = caddy.Duration(dur)
|
|
|
|
case "tls_trusted_ca_certs":
|
|
args := d.RemainingArgs()
|
|
if len(args) == 0 {
|
|
return d.ArgErr()
|
|
}
|
|
if h.TLS == nil {
|
|
h.TLS = new(TLSConfig)
|
|
}
|
|
|
|
h.TLS.RootCAPEMFiles = args
|
|
|
|
case "tls_server_name":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
if h.TLS == nil {
|
|
h.TLS = new(TLSConfig)
|
|
}
|
|
|
|
h.TLS.ServerName = d.Val()
|
|
|
|
case "keepalive":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
if h.KeepAlive == nil {
|
|
h.KeepAlive = new(KeepAlive)
|
|
}
|
|
if d.Val() == "off" {
|
|
var disable bool
|
|
h.KeepAlive.Enabled = &disable
|
|
break
|
|
}
|
|
dur, err := time.ParseDuration(d.Val())
|
|
if err != nil {
|
|
return d.Errf("bad duration value '%s': %v", d.Val(), err)
|
|
}
|
|
h.KeepAlive.IdleConnTimeout = caddy.Duration(dur)
|
|
|
|
case "keepalive_idle_conns":
|
|
if !d.NextArg() {
|
|
return d.ArgErr()
|
|
}
|
|
num, err := strconv.Atoi(d.Val())
|
|
if err != nil {
|
|
return d.Errf("bad integer value '%s': %v", d.Val(), err)
|
|
}
|
|
if h.KeepAlive == nil {
|
|
h.KeepAlive = new(KeepAlive)
|
|
}
|
|
h.KeepAlive.MaxIdleConns = num
|
|
h.KeepAlive.MaxIdleConnsPerHost = num
|
|
|
|
case "versions":
|
|
h.Versions = d.RemainingArgs()
|
|
if len(h.Versions) == 0 {
|
|
return d.ArgErr()
|
|
}
|
|
|
|
default:
|
|
return d.Errf("unrecognized subdirective %s", d.Val())
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Interface guards
|
|
var (
|
|
_ caddyfile.Unmarshaler = (*Handler)(nil)
|
|
_ caddyfile.Unmarshaler = (*HTTPTransport)(nil)
|
|
)
|