app/vmauth: properly proxy requests to backend paths ending with /

Previously the traling / was incorrectly removed when proxying requests from http://vmauth/

While at it, add more tests for requestHandler()

app/vmauth/auth_config.go

@@ -1009,6 +1009,14 @@ func getAuthTokensFromRequest(r *http.Request) []string {
 		}
 	}
 
+	// Authorization via http://user:pass@hosname/path
+	if u := r.URL.User; u != nil && u.Username() != "" {
+		username := u.Username()
+		password, _ := u.Password()
+		at := getHTTPAuthBasicToken(username, password)
+		ats = append(ats, at)
+	}
+
 	return ats
 }
 
@@ -1034,10 +1042,6 @@ func (up *URLPrefix) sanitizeAndInitialize() error {
 }
 
 func sanitizeURLPrefix(urlPrefix *url.URL) (*url.URL, error) {
-	// Remove trailing '/' from urlPrefix
-	for strings.HasSuffix(urlPrefix.Path, "/") {
-		urlPrefix.Path = urlPrefix.Path[:len(urlPrefix.Path)-1]
-	}
 	// Validate urlPrefix
 	if urlPrefix.Scheme != "http" && urlPrefix.Scheme != "https" {
 		return nil, fmt.Errorf("unsupported scheme for `url_prefix: %q`: %q; must be `http` or `https`", urlPrefix, urlPrefix.Scheme)

app/vmauth/main.go

@@ -118,7 +118,7 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 		}
 
 		w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
-		http.Error(w, "missing `Authorization` request header", http.StatusUnauthorized)
+		http.Error(w, "missing 'Authorization' request header", http.StatusUnauthorized)
 		return true
 	}
 

app/vmauth/main_test.go

@@ -46,10 +46,11 @@ func TestRequestHandler(t *testing.T) {
 		}
 
 		response := w.getResponse()
+		response = strings.ReplaceAll(response, "\r\n", "\n")
 		response = strings.TrimSpace(response)
 		responseExpected = strings.TrimSpace(responseExpected)
 		if response != responseExpected {
-			t.Fatalf("unexpected response\ngot\n%v\nwant\n%v", response, responseExpected)
+			t.Fatalf("unexpected response\ngot\n%s\nwant\n%s", response, responseExpected)
 		}
 	}
 
@@ -62,7 +63,8 @@ unauthorized_user:
 	backendHandler := func(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
 	}
-	responseExpected := `statusCode=200
+	responseExpected := `
+statusCode=200
 requested_url={BACKEND}/foo/abc/def?bar=baz&some_arg=some_value
 `
 	f(cfgStr, requestURL, backendHandler, responseExpected)
@@ -73,12 +75,13 @@ unauthorized_user:
   url_prefix: "{BACKEND}/foo?bar=baz"
   keep_original_host: true
 `
-	requestURL = "http://some-host.com/abc/def?some_arg=some_value"
+	requestURL = "http://some-host.com/abc/def"
 	backendHandler = func(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
 	}
-	responseExpected = `statusCode=200
+	responseExpected = `
-requested_url=http://some-host.com/foo/abc/def?bar=baz&some_arg=some_value
+statusCode=200
+requested_url=http://some-host.com/foo/abc/def?bar=baz
 `
 	f(cfgStr, requestURL, backendHandler, responseExpected)
 
@@ -89,15 +92,165 @@ unauthorized_user:
   headers:
   - "Host: other-host:12345"
 `
-	requestURL = "http://some-host.com/abc/def?some_arg=some_value"
+	requestURL = "http://some-host.com/abc/def"
 	backendHandler = func(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
 	}
-	responseExpected = `statusCode=200
+	responseExpected = `
-requested_url=http://other-host:12345/foo/abc/def?bar=baz&some_arg=some_value
+statusCode=200
+requested_url=http://other-host:12345/foo/abc/def?bar=baz
 `
 	f(cfgStr, requestURL, backendHandler, responseExpected)
 
+	// /-/reload handler failure
+	origAuthKey := reloadAuthKey.Get()
+	if err := reloadAuthKey.Set("secret"); err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	cfgStr = `
+unauthorized_user:
+  url_prefix: "{BACKEND}/foo"
+`
+	requestURL = "http://some-host.com/-/reload"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+The provided authKey doesn't match -reloadAuthKey
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	if err := reloadAuthKey.Set(origAuthKey); err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+
+	// missing authorization
+	cfgStr = `
+users:
+- username: foo
+  url_prefix: "{BACKEND}/bar"
+`
+	requestURL = "http://some-host.com/a/b"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+Www-Authenticate: Basic realm="Restricted"
+missing 'Authorization' request header
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// incorrect authorization
+	cfgStr = `
+users:
+- username: foo
+  password: secret
+  url_prefix: "{BACKEND}/bar"
+`
+	requestURL = "http://foo:invalid-secret@some-host.com/a/b"
+	backendHandler = func(_ http.ResponseWriter, _ *http.Request) {
+		panic(fmt.Errorf("backend handler shouldn't be called"))
+	}
+	responseExpected = `
+statusCode=401
+Unauthorized
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// correct authorization
+	cfgStr = `
+users:
+- username: foo
+  password: secret
+  url_prefix: "{BACKEND}/bar"
+`
+	requestURL = "http://foo:secret@some-host.com/a/b"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/bar/a/b
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo?bar=baz
+`
+	requestURL = "http://some-host.com/../../a//.///bar/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/a/bar/?bar=baz
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works for url without path
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo?bar=baz
+`
+	requestURL = "http://some-host.com/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo?bar=baz
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify how path cleanup works for url without path if url_prefix path ends with /
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/foo/?bar=baz
+`
+	requestURL = "http://some-host.com/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/foo/?bar=baz
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+	// verify how path cleanup works for url without path and the url_prefix without path prefix
+	cfgStr = `
+unauthorized_user:
+  url_prefix: {BACKEND}/?bar=baz
+`
+	requestURL = "http://some-host.com/"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/?bar=baz
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
+
+	// verify routing to default_url
+	cfgStr = `
+unauthorized_user:
+  url_map:
+  - src_paths: ["/foo/.+"]
+    url_prefix: {BACKEND}/x-foo/
+  default_url: {BACKEND}/404.html
+`
+	requestURL = "http://some-host.com/abc?de=fg"
+	backendHandler = func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "requested_url=http://%s%s", r.Host, r.URL)
+	}
+	responseExpected = `
+statusCode=200
+requested_url={BACKEND}/404.html?request_path=http%3A%2F%2Fsome-host.com%2Fabc%3Fde%3Dfg
+`
+	f(cfgStr, requestURL, backendHandler, responseExpected)
 }
 
 type fakeResponseWriter struct {
@@ -130,9 +283,10 @@ func (w *fakeResponseWriter) WriteHeader(statusCode int) {
 		"Content-Length":         true,
 		"Content-Type":           true,
 		"Date":                   true,
+		"X-Content-Type-Options": true,
 	})
 	if err != nil {
-		panic(fmt.Errorf("BUG: cannot marshal headers: %s", err))
+		panic(fmt.Errorf("cannot marshal headers: %s", err))
 	}
 }
 

docs/CHANGELOG.md

@@ -31,6 +31,7 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).
 
 ## tip
 
+* BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth/): properly proxy requests to backend urls ending with `/` if the original request path equals to `/`. Previously the trailing `/` at the backend path was incorrectly removed. For example, if the request to `http://vmauth/` is configured to be proxied to `url_prefix=http://backend/foo/`, then it was proxied to `http://backend/foo`, while it should go to `http://backend/foo/`.
 * BUGFIX: [vmauth](https://docs.victoriametrics.com/vmauth/): fix `cannot read data after closing the reader` error when proxying HTTP requests without body (aka `GET` requests). The issue has been introduced in [v1.102.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.102.0) in [this commit](https://github.com/VictoriaMetrics/VictoriaMetrics/commit/7ee57974935a662896f2de40fdf613156630617d).
 
 ## [v1.102.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.102.0)