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-rw-r--r--source3/passdb/lookup_sid.c42
1 files changed, 38 insertions, 4 deletions
diff --git a/source3/passdb/lookup_sid.c b/source3/passdb/lookup_sid.c
index 4b2edd5d59..a5e3362882 100644
--- a/source3/passdb/lookup_sid.c
+++ b/source3/passdb/lookup_sid.c
@@ -1296,7 +1296,16 @@ void uid_to_sid(DOM_SID *psid, uid_t uid)
/* Check the winbindd cache directly. */
ret = idmap_cache_find_uid2sid(uid, psid, &expired);
- if (!ret || expired || (ret && is_null_sid(psid))) {
+ if (ret && is_null_sid(psid)) {
+ /*
+ * Negative cache entry, we already asked.
+ * do legacy.
+ */
+ legacy_uid_to_sid(psid, uid);
+ return;
+ }
+
+ if (!ret || expired) {
/* Not in cache. Ask winbindd. */
if (!winbind_uid_to_sid(psid, uid)) {
if (!winbind_ping()) {
@@ -1333,7 +1342,16 @@ void gid_to_sid(DOM_SID *psid, gid_t gid)
/* Check the winbindd cache directly. */
ret = idmap_cache_find_gid2sid(gid, psid, &expired);
- if (!ret || expired || (ret && is_null_sid(psid))) {
+ if (ret && is_null_sid(psid)) {
+ /*
+ * Negative cache entry, we already asked.
+ * do legacy.
+ */
+ legacy_gid_to_sid(psid, gid);
+ return;
+ }
+
+ if (!ret || expired) {
/* Not in cache. Ask winbindd. */
if (!winbind_gid_to_sid(psid, gid)) {
if (!winbind_ping()) {
@@ -1387,7 +1405,15 @@ bool sid_to_uid(const DOM_SID *psid, uid_t *puid)
/* Check the winbindd cache directly. */
ret = idmap_cache_find_sid2uid(psid, puid, &expired);
- if (!ret || expired || (ret && (*puid == (uid_t)-1))) {
+ if (ret && (*puid == (uid_t)-1)) {
+ /*
+ * Negative cache entry, we already asked.
+ * do legacy.
+ */
+ return legacy_sid_to_uid(psid, puid);
+ }
+
+ if (!ret || expired) {
/* Not in cache. Ask winbindd. */
if (!winbind_sid_to_uid(puid, psid)) {
if (!winbind_ping()) {
@@ -1443,7 +1469,15 @@ bool sid_to_gid(const DOM_SID *psid, gid_t *pgid)
/* Check the winbindd cache directly. */
ret = idmap_cache_find_sid2gid(psid, pgid, &expired);
- if (!ret || expired || (ret && (*pgid == (gid_t)-1))) {
+ if (ret && (*pgid == (gid_t)-1)) {
+ /*
+ * Negative cache entry, we already asked.
+ * do legacy.
+ */
+ return legacy_sid_to_gid(psid, pgid);
+ }
+
+ if (!ret || expired) {
/* Not in cache or negative. Ask winbindd. */
/* Ask winbindd if it can map this sid to a gid.
* (Idmap will check it is a valid SID and of the right type) */