[ovs-dev] [PATCH] bridge: Forbid '/' in bridge names to prevent arbitrary directory access.

[Ben Pfaff]

---
 vswitchd/bridge.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index b5071e2..f9cf9e7 100644
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -739,9 +739,16 @@ add_del_bridges(const struct ovsrec_open_vswitch *cfg)
     /* Collect new bridges' names and types. */
     shash_init(&new_br);
     for (i = 0; i < cfg->n_bridges; i++) {
+        static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
         const struct ovsrec_bridge *br_cfg = cfg->bridges[i];
-        if (!shash_add_once(&new_br, br_cfg->name, br_cfg)) {
-            VLOG_WARN("bridge %s specified twice", br_cfg->name);
+
+        if (strchr(br_cfg->name, '/')) {
+            /* Prevent remote ovsdb-server users from accessing arbitrary
+             * directories, e.g. consider a bridge named "../../../etc/". */
+            VLOG_WARN_RL(&rl, "ignoring bridge with invalid name \"%s\"",
+                         br_cfg->name);
+        } else if (!shash_add_once(&new_br, br_cfg->name, br_cfg)) {
+            VLOG_WARN_RL(&rl, "bridge %s specified twice", br_cfg->name);
         }
     }
 
-- 
1.7.4.4