support additional fields in authproxy (#11661)

docs/sources/installation/configuration.md

@@ -659,6 +659,10 @@ Set to `true` to enable auto sign up of users who do not exist in Grafana DB. De
 
 Limit where auth proxy requests come from by configuring a list of IP addresses. This can be used to prevent users spoofing the X-WEBAUTH-USER header.
 
+### headers
+
+Used to define additional headers for `Name`, `Email` and/or `Login`, for example if the user's name is sent in the X-WEBAUTH-NAME header and their email address in the X-WEBAUTH-EMAIL header, set `headers = Name:X-WEBAUTH-NAME Email:X-WEBAUTH-EMAIL`.
+
 <hr>
 
 ## [session]

pkg/middleware/auth_proxy.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net"
 	"net/mail"
+	"reflect"
 	"strings"
 	"time"
 
@@ -111,6 +112,16 @@ func initContextWithAuthProxy(ctx *m.ReqContext, orgID int64) bool {
 			return true
 		}
 
+		for _, field := range []string{"Name", "Email", "Login"} {
+			if setting.AuthProxyHeaders[field] == "" {
+				continue
+			}
+
+			if val := ctx.Req.Header.Get(setting.AuthProxyHeaders[field]); val != "" {
+				reflect.ValueOf(extUser).Elem().FieldByName(field).SetString(val)
+			}
+		}
+
 		// add/update user in grafana
 		cmd := &m.UpsertUserCommand{
 			ReqContext:    ctx,

pkg/setting/setting.go

@@ -125,6 +125,7 @@ var (
 	AuthProxyAutoSignUp     bool
 	AuthProxyLdapSyncTtl    int
 	AuthProxyWhitelist      string
+	AuthProxyHeaders        map[string]string
 
 	// Basic Auth
 	BasicAuthEnabled bool
@@ -611,6 +612,14 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 	AuthProxyLdapSyncTtl = authProxy.Key("ldap_sync_ttl").MustInt()
 	AuthProxyWhitelist = authProxy.Key("whitelist").String()
 
+	AuthProxyHeaders = make(map[string]string)
+	for _, propertyAndHeader := range util.SplitString(authProxy.Key("headers").String()) {
+		split := strings.SplitN(propertyAndHeader, ":", 2)
+		if len(split) == 2 {
+			AuthProxyHeaders[split[0]] = split[1]
+		}
+	}
+
 	// basic auth
 	authBasic := iniFile.Section("auth.basic")
 	BasicAuthEnabled = authBasic.Key("enabled").MustBool(true)