authelia/internal/middlewares/http_to_authelia_handler_adaptor.go
James Elliott ddea31193b
feature(oidc): add support for OpenID Connect
OpenID connect has become a standard when it comes to authentication and
in order to fix a security concern around forwarding authentication and authorization information
it has been decided to add support for it.

This feature is in beta version and only enabled when there is a configuration for it.
Before enabling it in production, please consider that it's in beta with potential bugs and that there
are several production critical features still missing such as all OIDC related data is stored in
configuration or memory. This means you are potentially going to experience issues with HA
deployments, or when restarting a single instance specifically related to OIDC.

We are still working on adding the remaining set of features before making it GA as soon as possible.

Related to #189

Co-authored-by: Clement Michaud <clement.michaud34@gmail.com>
2021-05-05 00:15:36 +02:00

126 lines
2.5 KiB
Go

package middlewares
import (
"io"
"net/http"
"net/url"
"github.com/valyala/fasthttp"
)
// AutheliaHandlerFunc is used with the NewHTTPToAutheliaHandlerAdaptor to encapsulate a func.
type AutheliaHandlerFunc func(ctx *AutheliaCtx, rw http.ResponseWriter, r *http.Request)
type netHTTPBody struct {
b []byte
}
// Read reads the body.
func (r *netHTTPBody) Read(p []byte) (int, error) {
if len(r.b) == 0 {
return 0, io.EOF
}
n := copy(p, r.b)
r.b = r.b[n:]
return n, nil
}
// Close closes the body.
func (r *netHTTPBody) Close() error {
r.b = r.b[:0]
return nil
}
type netHTTPResponseWriter struct {
statusCode int
h http.Header
body []byte
}
// StatusCode returns the status code.
func (w *netHTTPResponseWriter) StatusCode() int {
if w.statusCode == 0 {
return http.StatusOK
}
return w.statusCode
}
// Header returns the http.Header.
func (w *netHTTPResponseWriter) Header() http.Header {
if w.h == nil {
w.h = make(http.Header)
}
return w.h
}
// WriteHeader needs to be documented TODO: document it.
func (w *netHTTPResponseWriter) WriteHeader(statusCode int) {
w.statusCode = statusCode
}
// Write writes to the body.
func (w *netHTTPResponseWriter) Write(p []byte) (int, error) {
w.body = append(w.body, p...)
return len(p), nil
}
// NewHTTPToAutheliaHandlerAdaptor creates a new adaptor given the AutheliaHandlerFunc.
func NewHTTPToAutheliaHandlerAdaptor(h AutheliaHandlerFunc) RequestHandler {
return func(ctx *AutheliaCtx) {
var r http.Request
body := ctx.PostBody()
r.Method = string(ctx.Method())
r.Proto = "HTTP/1.1"
r.ProtoMajor = 1
r.ProtoMinor = 1
r.RequestURI = string(ctx.RequestURI())
r.ContentLength = int64(len(body))
r.Host = string(ctx.Host())
r.RemoteAddr = ctx.RemoteAddr().String()
hdr := make(http.Header)
ctx.Request.Header.VisitAll(func(k, v []byte) {
sk := string(k)
sv := string(v)
switch sk {
case "Transfer-Encoding":
r.TransferEncoding = append(r.TransferEncoding, sv)
default:
hdr.Set(sk, sv)
}
})
r.Header = hdr
r.Body = &netHTTPBody{body}
rURL, err := url.ParseRequestURI(r.RequestURI)
if err != nil {
ctx.Logger.Errorf("cannot parse requestURI %q: %s", r.RequestURI, err)
ctx.RequestCtx.Error("Internal Server Error", fasthttp.StatusInternalServerError)
return
}
r.URL = rURL
var w netHTTPResponseWriter
h(ctx, &w, r.WithContext(ctx))
ctx.SetStatusCode(w.StatusCode())
for k, vv := range w.Header() {
for _, v := range vv {
ctx.Response.Header.Set(k, v)
}
}
ctx.Write(w.body) //nolint:errcheck
}
}