Add support for setting the basic auth password.

For tools that don't like empty passwords, this change allows
one to set a shared secret password for all users.

README.md

@@ -116,6 +116,7 @@ Usage of oauth2_proxy:
   -login-url="": Authentication endpoint
   -pass-access-token=false: pass OAuth access_token to upstream via X-Forwarded-Access-Token header
   -pass-basic-auth=true: pass HTTP Basic Auth, X-Forwarded-User and X-Forwarded-Email information to upstream
+  -basic-auth-password="": the password to set when passing the HTTP Basic Auth header
   -pass-host-header=true: pass the request Host Header to upstream
   -profile-url="": Profile access endpoint
   -provider="google": OAuth provider

main.go

@@ -31,6 +31,7 @@ func main() {
 	flagSet.String("redirect-url", "", "the OAuth Redirect URL. ie: \"https://internalapp.yourcompany.com/oauth2/callback\"")
 	flagSet.Var(&upstreams, "upstream", "the http url(s) of the upstream endpoint. If multiple, routing is based on path")
 	flagSet.Bool("pass-basic-auth", true, "pass HTTP Basic Auth, X-Forwarded-User and X-Forwarded-Email information to upstream")
+	flagSet.String("basic-auth-password", "", "the password to set when passing the HTTP Basic Auth header")
 	flagSet.Bool("pass-access-token", false, "pass OAuth access_token to upstream via X-Forwarded-Access-Token header")
 	flagSet.Bool("pass-host-header", true, "pass the request Host Header to upstream")
 	flagSet.Var(&skipAuthRegex, "skip-auth-regex", "bypass authentication for requests path's that match (may be given multiple times)")

oauthproxy.go

@@ -42,6 +42,7 @@ type OauthProxy struct {
 	DisplayHtpasswdForm bool
 	serveMux            http.Handler
 	PassBasicAuth       bool
+	BasicAuthPassword   string
 	PassAccessToken     bool
 	CookieCipher        *cookie.Cipher
 	skipAuthRegex       []string
@@ -148,6 +149,7 @@ func NewOauthProxy(opts *Options, validator func(string) bool) *OauthProxy {
 		skipAuthRegex:     opts.SkipAuthRegex,
 		compiledRegex:     opts.CompiledRegex,
 		PassBasicAuth:     opts.PassBasicAuth,
+		BasicAuthPassword: opts.BasicAuthPassword,
 		PassAccessToken:   opts.PassAccessToken,
 		CookieCipher:      cipher,
 		templates:         loadTemplates(opts.CustomTemplatesDir),
@@ -518,7 +520,7 @@ func (p *OauthProxy) Proxy(rw http.ResponseWriter, req *http.Request) {
 
 	// At this point, the user is authenticated. proxy normally
 	if p.PassBasicAuth {
-		req.SetBasicAuth(session.User, "")
+		req.SetBasicAuth(session.User, p.BasicAuthPassword)
 		req.Header["X-Forwarded-User"] = []string{session.User}
 		if session.Email != "" {
 			req.Header["X-Forwarded-Email"] = []string{session.Email}

oauthproxy_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/base64"
 	"github.com/bitly/oauth2_proxy/providers"
 	"github.com/bmizerany/assert"
 	"io/ioutil"
@@ -88,6 +89,101 @@ func TestRobotsTxt(t *testing.T) {
 	assert.Equal(t, "User-agent: *\nDisallow: /", rw.Body.String())
 }
 
+func TestBasicAuthPassword(t *testing.T) {
+	provider_server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("%#v", r)
+		url := r.URL
+		payload := ""
+		switch url.Path {
+		case "/oauth/token":
+			payload = `{"access_token": "my_auth_token"}`
+		default:
+			payload = r.Header.Get("Authorization")
+			if payload == "" {
+				payload = "No Authorization header found."
+			}
+		}
+		w.WriteHeader(200)
+		w.Write([]byte(payload))
+	}))
+	opts := NewOptions()
+	opts.Upstreams = append(opts.Upstreams, provider_server.URL)
+	// The CookieSecret must be 32 bytes in order to create the AES
+	// cipher.
+	opts.CookieSecret = "xyzzyplughxyzzyplughxyzzyplughxp"
+	opts.ClientID = "bazquux"
+	opts.ClientSecret = "foobar"
+	opts.CookieSecure = false
+	opts.PassBasicAuth = true
+	opts.BasicAuthPassword = "This is a secure password"
+	opts.Validate()
+
+	provider_url, _ := url.Parse(provider_server.URL)
+	const email_address = "michael.bland@gsa.gov"
+	const user_name = "michael.bland"
+
+	opts.provider = &TestProvider{
+		ProviderData: &providers.ProviderData{
+			ProviderName: "Test Provider",
+			LoginUrl: &url.URL{
+				Scheme: "http",
+				Host:   provider_url.Host,
+				Path:   "/oauth/authorize",
+			},
+			RedeemUrl: &url.URL{
+				Scheme: "http",
+				Host:   provider_url.Host,
+				Path:   "/oauth/token",
+			},
+			ProfileUrl: &url.URL{
+				Scheme: "http",
+				Host:   provider_url.Host,
+				Path:   "/api/v1/profile",
+			},
+			Scope: "profile.email",
+		},
+		EmailAddress: email_address,
+	}
+
+	proxy := NewOauthProxy(opts, func(email string) bool {
+		return email == email_address
+	})
+
+	rw := httptest.NewRecorder()
+	req, _ := http.NewRequest("GET", "/oauth2/callback?code=callback_code",
+		strings.NewReader(""))
+	proxy.ServeHTTP(rw, req)
+	cookie := rw.HeaderMap["Set-Cookie"][0]
+
+	cookieName := proxy.CookieName
+	var value string
+	key_prefix := cookieName + "="
+
+	for _, field := range strings.Split(cookie, "; ") {
+		value = strings.TrimPrefix(field, key_prefix)
+		if value != field {
+			break
+		} else {
+			value = ""
+		}
+	}
+
+	req, _ = http.NewRequest("GET", "/", strings.NewReader(""))
+	req.AddCookie(&http.Cookie{
+		Name:     cookieName,
+		Value:    value,
+		Path:     "/",
+		Expires:  time.Now().Add(time.Duration(24)),
+		HttpOnly: true,
+	})
+
+	rw = httptest.NewRecorder()
+	proxy.ServeHTTP(rw, req)
+	expectedHeader := "Basic " + base64.StdEncoding.EncodeToString([]byte(user_name+":"+opts.BasicAuthPassword))
+	assert.Equal(t, expectedHeader, rw.Body.String())
+	provider_server.Close()
+}
+
 type TestProvider struct {
 	*providers.ProviderData
 	EmailAddress string

options.go

@@ -40,6 +40,7 @@ type Options struct {
 	Upstreams         []string `flag:"upstream" cfg:"upstreams"`
 	SkipAuthRegex     []string `flag:"skip-auth-regex" cfg:"skip_auth_regex"`
 	PassBasicAuth     bool     `flag:"pass-basic-auth" cfg:"pass_basic_auth"`
+	BasicAuthPassword string   `flag:"basic-auth-password" cfg:"basic_auth_password"`
 	PassAccessToken   bool     `flag:"pass-access-token" cfg:"pass_access_token"`
 	PassHostHeader    bool     `flag:"pass-host-header" cfg:"pass_host_header"`