Auth: Remove Email Lookup from oauth integrations 10.0 (#900)

backport https://github.com/grafana/grafana-private-mirror/pull/894 to 9.5.x

pkg/setting/setting.go

@@ -294,8 +294,9 @@ type Cfg struct {
 	AuthProxySyncTTL          int
 
 	// OAuth
-	OAuthAutoLogin    bool
-	OAuthCookieMaxAge int
+	OAuthAutoLogin                bool
+	OAuthCookieMaxAge             int
+	OAuthAllowInsecureEmailLookup bool
 
 	// JWT Auth
 	JWTAuthEnabled                 bool
@@ -1458,6 +1459,8 @@ func readAuthSettings(iniFile *ini.File, cfg *Cfg) (err error) {
 		return err
 	}
 
+	cfg.OAuthAllowInsecureEmailLookup = auth.Key("oauth_allow_insecure_email_lookup").MustBool(false)
+
 	const defaultMaxLifetime = "30d"
 	maxLifetimeDurationVal := valueAsString(auth, "login_maximum_lifetime_duration", defaultMaxLifetime)
 	cfg.LoginMaxLifetime, err = gtime.ParseDuration(maxLifetimeDurationVal)