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authorization.go
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/
authorization.go
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package main
import (
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
)
func (u *upstream) newUpstreamRequest(r *http.Request, body io.Reader, suffix string) (*http.Request, error) {
url := u.authBackend + "/" + strings.TrimPrefix(r.URL.RequestURI(), u.relativeURLRoot) + suffix
authReq, err := http.NewRequest(r.Method, url, body)
if err != nil {
return nil, err
}
// Forward all headers from our client to the auth backend. This includes
// HTTP Basic authentication credentials (the 'Authorization' header).
for k, v := range r.Header {
authReq.Header[k] = v
}
// Clean some headers when issuing a new request without body
if body == nil {
authReq.Header.Del("Content-Type")
authReq.Header.Del("Content-Encoding")
authReq.Header.Del("Content-Length")
authReq.Header.Del("Content-Disposition")
authReq.Header.Del("Accept-Encoding")
// Hop-by-hop headers. These are removed when sent to the backend.
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html
authReq.Header.Del("Transfer-Encoding")
authReq.Header.Del("Connection")
authReq.Header.Del("Keep-Alive")
authReq.Header.Del("Proxy-Authenticate")
authReq.Header.Del("Proxy-Authorization")
authReq.Header.Del("Te")
authReq.Header.Del("Trailers")
authReq.Header.Del("Upgrade")
}
// Also forward the Host header, which is excluded from the Header map by the http libary.
// This allows the Host header received by the backend to be consistent with other
// requests not going through gitlab-workhorse.
authReq.Host = r.Host
// Set a custom header for the request. This can be used in some
// configurations (Passenger) to solve auth request routing problems.
authReq.Header.Set("Gitlab-Workhorse", Version)
return authReq, nil
}
func preAuthorizeHandler(handleFunc serviceHandleFunc, suffix string) serviceHandleFunc {
return func(w http.ResponseWriter, r *gitRequest) {
authReq, err := r.u.newUpstreamRequest(r.Request, nil, suffix)
if err != nil {
fail500(w, fmt.Errorf("preAuthorizeHandler: newUpstreamRequest: %v", err))
return
}
authResponse, err := r.u.httpClient.Do(authReq)
if err != nil {
fail500(w, fmt.Errorf("preAuthorizeHandler: do %v: %v", authReq.URL.Path, err))
return
}
defer authResponse.Body.Close()
if authResponse.StatusCode != 200 {
// The Git request is not allowed by the backend. Maybe the
// client needs to send HTTP Basic credentials. Forward the
// response from the auth backend to our client. This includes
// the 'WWW-Authenticate' header that acts as a hint that
// Basic auth credentials are needed.
for k, v := range authResponse.Header {
// Accomodate broken clients that do case-sensitive header lookup
if k == "Www-Authenticate" {
w.Header()["WWW-Authenticate"] = v
} else {
w.Header()[k] = v
}
}
w.WriteHeader(authResponse.StatusCode)
io.Copy(w, authResponse.Body)
return
}
// The auth backend validated the client request and told us additional
// request metadata. We must extract this information from the auth
// response body.
if err := json.NewDecoder(authResponse.Body).Decode(&r.authorizationResponse); err != nil {
fail500(w, fmt.Errorf("preAuthorizeHandler: decode authorization response: %v", err))
return
}
// Don't hog a TCP connection in CLOSE_WAIT, we can already close it now
authResponse.Body.Close()
// Negotiate authentication (Kerberos) may need to return a WWW-Authenticate
// header to the client even in case of success as per RFC4559.
for k, v := range authResponse.Header {
// Case-insensitive comparison as per RFC7230
if strings.EqualFold(k, "WWW-Authenticate") {
w.Header()[k] = v
}
}
handleFunc(w, r)
}
}