Auth: Support for user authentication via reverse proxy header (like…

Auth: Support for user authentication via reverse proxy header (like X-Authenticated-User, or X-WEBAUTH-USER), Closes #1921

CHANGELOG.md

@@ -10,7 +10,7 @@
 **Backend**
 - [Issue #1905](https://github.com/grafana/grafana/issues/1905). Github OAuth: You can now configure a Github team membership requirement, thx @dewski
 - [Issue #1891](https://github.com/grafana/grafana/issues/1891). Security: New config option to disable the use of gravatar for profile images
-
+- [Issue #1921](https://github.com/grafana/grafana/issues/1921). Auth: Support for user authentication via reverse proxy header (like X-Authenticated-User, or X-WEBAUTH-USER)
 
 # 2.0.3 (unreleased - 2.0.x branch)
 

pkg/middleware/auth_proxy.go

+package middleware
+
+import (
+	"github.com/grafana/grafana/pkg/bus"
+	m "github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/setting"
+)
+
+func initContextWithAuthProxy(ctx *Context) bool {
+	if !setting.AuthProxyEnabled {
+		return false
+	}
+
+	proxyHeaderValue := ctx.Req.Header.Get(setting.AuthProxyHeaderName)
+	if len(proxyHeaderValue) <= 0 {
+		return false
+	}
+
+	query := getSignedInUserQueryForProxyAuth(proxyHeaderValue)
+	if err := bus.Dispatch(query); err != nil {
+		if err != m.ErrUserNotFound {
+			ctx.Handle(500, "Failed find user specifed in auth proxy header", err)
+			return true
+		}
+
+		if setting.AuthProxyAutoSignUp {
+			cmd := getCreateUserCommandForProxyAuth(proxyHeaderValue)
+			if err := bus.Dispatch(cmd); err != nil {
+				ctx.Handle(500, "Failed to create user specified in auth proxy header", err)
+				return true
+			}
+			query = &m.GetSignedInUserQuery{UserId: cmd.Result.Id}
+			if err := bus.Dispatch(query); err != nil {
+				ctx.Handle(500, "Failed find user after creation", err)
+				return true
+			}
+		}
+	}
+
+	ctx.SignedInUser = query.Result
+	ctx.IsSignedIn = true
+	return true
+}
+
+func getSignedInUserQueryForProxyAuth(headerVal string) *m.GetSignedInUserQuery {
+	query := m.GetSignedInUserQuery{}
+	if setting.AuthProxyHeaderProperty == "username" {
+		query.Login = headerVal
+	} else if setting.AuthProxyHeaderProperty == "email" {
+		query.Email = headerVal
+	} else {
+		panic("Auth proxy header property invalid")
+	}
+	return &query
+}
+
+func getCreateUserCommandForProxyAuth(headerVal string) *m.CreateUserCommand {
+	cmd := m.CreateUserCommand{}
+	if setting.AuthProxyHeaderProperty == "username" {
+		cmd.Login = headerVal
+	} else if setting.AuthProxyHeaderProperty == "email" {
+		cmd.Email = headerVal
+	} else {
+		panic("Auth proxy header property invalid")
+	}
+	return &cmd
+}

pkg/middleware/auth_test.go

+package middleware
+
+import (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestMiddlewareAuth(t *testing.T) {
+
+	Convey("Given the grafana middleware", t, func() {
+		reqSignIn := Auth(&AuthOptions{ReqSignedIn: true})
+
+		middlewareScenario("ReqSignIn true and unauthenticated request", func(sc *scenarioContext) {
+			sc.m.Get("/secure", reqSignIn, sc.defaultHandler)
+
+			sc.fakeReq("GET", "/secure").exec()
+
+			Convey("Should redirect to login", func() {
+				So(sc.resp.Code, ShouldEqual, 302)
+			})
+		})
+
+		middlewareScenario("ReqSignIn true and unauthenticated API request", func(sc *scenarioContext) {
+			sc.m.Get("/api/secure", reqSignIn, sc.defaultHandler)
+
+			sc.fakeReq("GET", "/api/secure").exec()
+
+			Convey("Should return 401", func() {
+				So(sc.resp.Code, ShouldEqual, 401)
+			})
+		})
+
+	})
+}

pkg/middleware/middleware.go

 package middleware
 
 import (
-	"fmt"
 	"strconv"
 	"strings"
 
@@ -41,6 +40,7 @@ func GetContextHandler() macaron.Handler {
 		// then look for api key in session (special case for render calls via api)
 		// then test if anonymous access is enabled
 		if initContextWithApiKey(ctx) ||
+			initContextWithAuthProxy(ctx) ||
 			initContextWithUserSessionCookie(ctx) ||
 			initContextWithApiKeyFromSession(ctx) ||
 			initContextWithAnonymousUser(ctx) {
@@ -79,7 +79,6 @@ func initContextWithUserSessionCookie(ctx *Context) bool {
 
 	var userId int64
 	if userId = getRequestUserId(ctx); userId == 0 {
-		fmt.Printf("Not userId")
 		return false
 	}
 

pkg/middleware/middleware_test.go

@@ -128,6 +128,62 @@ func TestMiddlewareContext(t *testing.T) {
 				So(sc.context.IsSignedIn, ShouldBeFalse)
 			})
 		})
+
+		middlewareScenario("When auth_proxy is enabled enabled and user exists", func(sc *scenarioContext) {
+			setting.AuthProxyEnabled = true
+			setting.AuthProxyHeaderName = "X-WEBAUTH-USER"
+			setting.AuthProxyHeaderProperty = "username"
+
+			bus.AddHandler("test", func(query *m.GetSignedInUserQuery) error {
+				query.Result = &m.SignedInUser{OrgId: 2, UserId: 12}
+				return nil
+			})
+
+			sc.fakeReq("GET", "/")
+			sc.req.Header.Add("X-WEBAUTH-USER", "torkelo")
+			sc.exec()
+
+			Convey("should init context with user info", func() {
+				So(sc.context.IsSignedIn, ShouldBeTrue)
+				So(sc.context.UserId, ShouldEqual, 12)
+				So(sc.context.OrgId, ShouldEqual, 2)
+			})
+		})
+
+		middlewareScenario("When auth_proxy is enabled enabled and user does not exists", func(sc *scenarioContext) {
+			setting.AuthProxyEnabled = true
+			setting.AuthProxyHeaderName = "X-WEBAUTH-USER"
+			setting.AuthProxyHeaderProperty = "username"
+			setting.AuthProxyAutoSignUp = true
+
+			bus.AddHandler("test", func(query *m.GetSignedInUserQuery) error {
+				if query.UserId > 0 {
+					query.Result = &m.SignedInUser{OrgId: 4, UserId: 33}
+					return nil
+				} else {
+					return m.ErrUserNotFound
+				}
+			})
+
+			var createUserCmd *m.CreateUserCommand
+			bus.AddHandler("test", func(cmd *m.CreateUserCommand) error {
+				createUserCmd = cmd
+				cmd.Result = m.User{Id: 33}
+				return nil
+			})
+
+			sc.fakeReq("GET", "/")
+			sc.req.Header.Add("X-WEBAUTH-USER", "torkelo")
+			sc.exec()
+
+			Convey("Should create user if auto sign up is enabled", func() {
+				So(sc.context.IsSignedIn, ShouldBeTrue)
+				So(sc.context.UserId, ShouldEqual, 33)
+				So(sc.context.OrgId, ShouldEqual, 4)
+
+			})
+		})
+
 	})
 }
 
@@ -149,12 +205,14 @@ func middlewareScenario(desc string, fn scenarioFunc) {
 		startSessionGC = func() {}
 		sc.m.Use(Sessioner(&session.Options{}))
 
-		sc.m.Get("/", func(c *Context) {
+		sc.defaultHandler = func(c *Context) {
 			sc.context = c
 			if sc.handlerFunc != nil {
 				sc.handlerFunc(sc.context)
 			}
-		})
+		}
+
+		sc.m.Get("/", sc.defaultHandler)
 
 		fn(sc)
 	})
@@ -167,6 +225,7 @@ type scenarioContext struct {
 	apiKey         string
 	respJson       map[string]interface{}
 	handlerFunc    handlerFunc
+	defaultHandler macaron.Handler
 
 	req *http.Request
 }

pkg/models/user.go

@@ -89,6 +89,8 @@ type GetUserByIdQuery struct {
 
 type GetSignedInUserQuery struct {
 	UserId int64
+	Login  string
+	Email  string
 	Result *SignedInUser
 }
 

pkg/services/sqlstore/user.go

@@ -263,8 +263,15 @@ func GetSignedInUser(query *m.GetSignedInUserQuery) error {
 	                org.id         as org_id
 	                FROM ` + dialect.Quote("user") + ` as u
 									LEFT OUTER JOIN org_user on org_user.org_id = u.org_id and org_user.user_id = u.id
-	                LEFT OUTER JOIN org on org.id = u.org_id
-	                WHERE u.id=?`
+	                LEFT OUTER JOIN org on org.id = u.org_id `
+
+	if query.UserId > 0 {
+		rawSql += "WHERE u.id=?"
+	} else if query.Login != "" {
+		rawSql += "WHERE u.login=?"
+	} else if query.Email != "" {
+		rawSql += "WHERE u.email=?"
+	}
 
 	var user m.SignedInUser
 	sess := x.Table("user")