154 lines
4.8 KiB
Go
154 lines
4.8 KiB
Go
package auth
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import (
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"io/ioutil"
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"net"
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"net/http"
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"strings"
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"github.com/containous/traefik/log"
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"github.com/containous/traefik/middlewares/tracing"
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"github.com/containous/traefik/types"
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"github.com/vulcand/oxy/forward"
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"github.com/vulcand/oxy/utils"
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)
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const (
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xForwardedURI = "X-Forwarded-Uri"
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xForwardedMethod = "X-Forwarded-Method"
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)
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// Forward the authentication to a external server
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func Forward(config *types.Forward, w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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// Ensure our request client does not follow redirects
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httpClient := http.Client{
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CheckRedirect: func(r *http.Request, via []*http.Request) error {
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return http.ErrUseLastResponse
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},
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}
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if config.TLS != nil {
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tlsConfig, err := config.TLS.CreateTLSConfig()
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if err != nil {
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tracing.SetErrorAndDebugLog(r, "Unable to configure TLS to call %s. Cause %s", config.Address, err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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httpClient.Transport = &http.Transport{
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TLSClientConfig: tlsConfig,
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}
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}
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forwardReq, err := http.NewRequest(http.MethodGet, config.Address, http.NoBody)
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tracing.LogRequest(tracing.GetSpan(r), forwardReq)
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if err != nil {
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tracing.SetErrorAndDebugLog(r, "Error calling %s. Cause %s", config.Address, err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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writeHeader(r, forwardReq, config.TrustForwardHeader)
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tracing.InjectRequestHeaders(forwardReq)
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forwardResponse, forwardErr := httpClient.Do(forwardReq)
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if forwardErr != nil {
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tracing.SetErrorAndDebugLog(r, "Error calling %s. Cause: %s", config.Address, forwardErr)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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body, readError := ioutil.ReadAll(forwardResponse.Body)
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if readError != nil {
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tracing.SetErrorAndDebugLog(r, "Error reading body %s. Cause: %s", config.Address, readError)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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defer forwardResponse.Body.Close()
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// Pass the forward response's body and selected headers if it
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// didn't return a response within the range of [200, 300).
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if forwardResponse.StatusCode < http.StatusOK || forwardResponse.StatusCode >= http.StatusMultipleChoices {
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log.Debugf("Remote error %s. StatusCode: %d", config.Address, forwardResponse.StatusCode)
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utils.CopyHeaders(w.Header(), forwardResponse.Header)
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utils.RemoveHeaders(w.Header(), forward.HopHeaders...)
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// Grab the location header, if any.
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redirectURL, err := forwardResponse.Location()
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if err != nil {
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if err != http.ErrNoLocation {
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tracing.SetErrorAndDebugLog(r, "Error reading response location header %s. Cause: %s", config.Address, err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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} else if redirectURL.String() != "" {
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// Set the location in our response if one was sent back.
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w.Header().Set("Location", redirectURL.String())
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}
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tracing.LogResponseCode(tracing.GetSpan(r), forwardResponse.StatusCode)
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w.WriteHeader(forwardResponse.StatusCode)
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w.Write(body)
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return
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}
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for _, headerName := range config.AuthResponseHeaders {
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r.Header.Set(headerName, forwardResponse.Header.Get(headerName))
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}
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r.RequestURI = r.URL.RequestURI()
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next(w, r)
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}
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func writeHeader(req *http.Request, forwardReq *http.Request, trustForwardHeader bool) {
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utils.CopyHeaders(forwardReq.Header, req.Header)
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utils.RemoveHeaders(forwardReq.Header, forward.HopHeaders...)
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if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
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if trustForwardHeader {
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if prior, ok := req.Header[forward.XForwardedFor]; ok {
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clientIP = strings.Join(prior, ", ") + ", " + clientIP
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}
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}
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forwardReq.Header.Set(forward.XForwardedFor, clientIP)
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}
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if xMethod := req.Header.Get(xForwardedMethod); xMethod != "" && trustForwardHeader {
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forwardReq.Header.Set(xForwardedMethod, xMethod)
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} else if req.Method != "" {
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forwardReq.Header.Set(xForwardedMethod, req.Method)
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} else {
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forwardReq.Header.Del(xForwardedMethod)
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}
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if xfp := req.Header.Get(forward.XForwardedProto); xfp != "" && trustForwardHeader {
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forwardReq.Header.Set(forward.XForwardedProto, xfp)
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} else if req.TLS != nil {
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forwardReq.Header.Set(forward.XForwardedProto, "https")
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} else {
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forwardReq.Header.Set(forward.XForwardedProto, "http")
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}
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if xfp := req.Header.Get(forward.XForwardedPort); xfp != "" && trustForwardHeader {
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forwardReq.Header.Set(forward.XForwardedPort, xfp)
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}
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if xfh := req.Header.Get(forward.XForwardedHost); xfh != "" && trustForwardHeader {
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forwardReq.Header.Set(forward.XForwardedHost, xfh)
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} else if req.Host != "" {
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forwardReq.Header.Set(forward.XForwardedHost, req.Host)
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} else {
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forwardReq.Header.Del(forward.XForwardedHost)
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}
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if xfURI := req.Header.Get(xForwardedURI); xfURI != "" && trustForwardHeader {
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forwardReq.Header.Set(xForwardedURI, xfURI)
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} else if req.URL.RequestURI() != "" {
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forwardReq.Header.Set(xForwardedURI, req.URL.RequestURI())
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} else {
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forwardReq.Header.Del(xForwardedURI)
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}
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}
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