Fix a bunch of compiler warnings about wrong format types.
[ira/wip.git] / source3 / passdb / lookup_sid.c
index 43c86ff0d6a85ded57395bf8facaa1a9e05ae681..c1249f5eb4fa05fe94bcfa8161ac88429ab298aa 100644 (file)
@@ -45,7 +45,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        if (tmp_ctx == NULL) {
                DEBUG(0, ("talloc_new failed\n"));
-               return False;
+               return false;
        }
 
        p = strchr_m(full_name, '\\');
@@ -59,16 +59,19 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                name = talloc_strdup(tmp_ctx, full_name);
        }
 
-       DEBUG(10,("lookup_name: %s => %s (domain), %s (name)\n", 
-               full_name, domain, name));
-
        if ((domain == NULL) || (name == NULL)) {
                DEBUG(0, ("talloc failed\n"));
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
-       if (strequal(domain, get_global_sam_name())) {
+       DEBUG(10,("lookup_name: %s => %s (domain), %s (name)\n",
+               full_name, domain, name));
+       DEBUG(10, ("lookup_name: flags = 0x0%x\n", flags));
+
+       if ((flags & LOOKUP_NAME_DOMAIN) &&
+           strequal(domain, get_global_sam_name()))
+       {
 
                /* It's our own domain, lookup the name in passdb */
                if (lookup_global_sam_name(name, flags, &rid, &type)) {
@@ -77,11 +80,12 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                        goto ok;
                }
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
-       if (strequal(domain, builtin_domain_name())) {
-
+       if ((flags & LOOKUP_NAME_BUILTIN) &&
+           strequal(domain, builtin_domain_name()))
+       {
                /* Explicit request for a name in BUILTIN */
                if (lookup_builtin_name(name, &rid)) {
                        sid_copy(&sid, &global_sid_Builtin);
@@ -90,13 +94,14 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                        goto ok;
                }
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        /* Try the explicit winbind lookup first, don't let it guess the
         * domain yet at this point yet. This comes later. */
 
        if ((domain[0] != '\0') &&
+           (flags & ~(LOOKUP_NAME_DOMAIN|LOOKUP_NAME_ISOLATED)) &&
            (winbind_lookup_name(domain, name, &sid, &type))) {
                        goto ok;
        }
@@ -107,7 +112,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                        goto ok;
                }
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        if (!(flags & LOOKUP_NAME_EXPLICIT) && strequal(domain, unix_groups_domain_name())) {
@@ -116,12 +121,12 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                        goto ok;
                }
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        if ((domain[0] == '\0') && (!(flags & LOOKUP_NAME_ISOLATED))) {
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        /* Now the guesswork begins, we haven't been given an explicit
@@ -131,14 +136,18 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        /* 1. well-known names */
 
-       if (lookup_wellknown_name(tmp_ctx, name, &sid, &domain)) {
+       if ((flags & LOOKUP_NAME_WKN) &&
+           lookup_wellknown_name(tmp_ctx, name, &sid, &domain))
+       {
                type = SID_NAME_WKN_GRP;
                goto ok;
        }
 
        /* 2. Builtin domain as such */
 
-       if (strequal(name, builtin_domain_name())) {
+       if ((flags & (LOOKUP_NAME_BUILTIN|LOOKUP_NAME_REMOTE)) &&
+           strequal(name, builtin_domain_name()))
+       {
                /* Swap domain and name */
                tmp = name; name = domain; domain = tmp;
                sid_copy(&sid, &global_sid_Builtin);
@@ -148,11 +157,13 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        /* 3. Account domain */
 
-       if (strequal(name, get_global_sam_name())) {
+       if ((flags & LOOKUP_NAME_DOMAIN) &&
+           strequal(name, get_global_sam_name()))
+       {
                if (!secrets_fetch_domain_sid(name, &sid)) {
                        DEBUG(3, ("Could not fetch my SID\n"));
                        TALLOC_FREE(tmp_ctx);
-                       return False;
+                       return false;
                }
                /* Swap domain and name */
                tmp = name; name = domain; domain = tmp;
@@ -162,11 +173,13 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        /* 4. Primary domain */
 
-       if (!IS_DC && strequal(name, lp_workgroup())) {
+       if ((flags & LOOKUP_NAME_DOMAIN) && !IS_DC &&
+           strequal(name, lp_workgroup()))
+       {
                if (!secrets_fetch_domain_sid(name, &sid)) {
                        DEBUG(3, ("Could not fetch the domain SID\n"));
                        TALLOC_FREE(tmp_ctx);
-                       return False;
+                       return false;
                }
                /* Swap domain and name */
                tmp = name; name = domain; domain = tmp;
@@ -177,7 +190,9 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
        /* 5. Trusted domains as such, to me it looks as if members don't do
               this, tested an XP workstation in a NT domain -- vl */
 
-       if (IS_DC && (pdb_get_trusteddom_pw(name, NULL, &sid, NULL))) {
+       if ((flags & LOOKUP_NAME_REMOTE) && IS_DC &&
+           (pdb_get_trusteddom_pw(name, NULL, &sid, NULL)))
+       {
                /* Swap domain and name */
                tmp = name; name = domain; domain = tmp;
                type = SID_NAME_DOMAIN;
@@ -186,7 +201,9 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        /* 6. Builtin aliases */        
 
-       if (lookup_builtin_name(name, &rid)) {
+       if ((flags & LOOKUP_NAME_BUILTIN) &&
+           lookup_builtin_name(name, &rid))
+       {
                domain = talloc_strdup(tmp_ctx, builtin_domain_name());
                sid_copy(&sid, &global_sid_Builtin);
                sid_append_rid(&sid, rid);
@@ -199,7 +216,9 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        /* Both cases are done by looking at our passdb */
 
-       if (lookup_global_sam_name(name, flags, &rid, &type)) {
+       if ((flags & LOOKUP_NAME_DOMAIN) &&
+           lookup_global_sam_name(name, flags, &rid, &type))
+       {
                domain = talloc_strdup(tmp_ctx, get_global_sam_name());
                sid_copy(&sid, get_global_sam_sid());
                sid_append_rid(&sid, rid);
@@ -210,7 +229,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
 
        if (!(flags & LOOKUP_NAME_REMOTE)) {
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        /* If we are not a DC, we have to ask in our primary domain. Let
@@ -251,7 +270,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                        DEBUG(2, ("winbind could not find the domain's name "
                                  "it just looked up for us\n"));
                        TALLOC_FREE(tmp_ctx);
-                       return False;
+                       return false;
                }
                goto ok;
        }
@@ -278,13 +297,13 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
         */
 
        TALLOC_FREE(tmp_ctx);
-       return False;
+       return false;
 
  ok:
        if ((domain == NULL) || (name == NULL)) {
                DEBUG(0, ("talloc failed\n"));
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        /*
@@ -295,7 +314,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
            !(*ret_name = talloc_strdup(mem_ctx, name))) {
                DEBUG(0, ("talloc failed\n"));
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        if (ret_domain != NULL) {
@@ -303,7 +322,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
                if (!(tmp_dom = talloc_strdup(mem_ctx, domain))) {
                        DEBUG(0, ("talloc failed\n"));
                        TALLOC_FREE(tmp_ctx);
-                       return False;
+                       return false;
                }
                strupper_m(tmp_dom);
                *ret_domain = tmp_dom;
@@ -318,7 +337,7 @@ bool lookup_name(TALLOC_CTX *mem_ctx,
        }
 
        TALLOC_FREE(tmp_ctx);
-       return True;
+       return true;
 }
 
 /************************************************************************
@@ -347,7 +366,7 @@ bool lookup_name_smbconf(TALLOC_CTX *mem_ctx,
 
                        tmp = talloc_strdup(mem_ctx, full_name);
                        if (!tmp) {
-                               return False;
+                               return false;
                        }
                        tmp[p - full_name] = '\\';
                        full_name = tmp;
@@ -363,13 +382,13 @@ bool lookup_name_smbconf(TALLOC_CTX *mem_ctx,
                                get_global_sam_name(),
                                full_name );
        if (!qualified_name) {
-               return False;
+               return false;
        }
 
        if (lookup_name(mem_ctx, qualified_name, flags,
                                ret_domain, ret_name,
                                ret_sid, ret_type)) {
-               return True;
+               return true;
        }
        
        /* Finally try with "Unix Users" or "Unix Group" */
@@ -379,7 +398,7 @@ bool lookup_name_smbconf(TALLOC_CTX *mem_ctx,
                                        unix_users_domain_name(),
                                full_name );
        if (!qualified_name) {
-               return False;
+               return false;
        }
 
        return lookup_name(mem_ctx, qualified_name, flags,
@@ -399,7 +418,7 @@ static bool wb_lookup_rids(TALLOC_CTX *mem_ctx,
        TALLOC_CTX *tmp_ctx;
 
        if (!(tmp_ctx = talloc_init("wb_lookup_rids"))) {
-               return False;
+               return false;
        }
 
        if (!winbind_lookup_rids(tmp_ctx, domain_sid, num_rids, rids,
@@ -410,12 +429,12 @@ static bool wb_lookup_rids(TALLOC_CTX *mem_ctx,
                        types[i] = SID_NAME_UNKNOWN;
                }
                TALLOC_FREE(tmp_ctx);
-               return True;
+               return true;
        }
 
        if (!(*domain_name = talloc_strdup(mem_ctx, *domain_name))) {
                TALLOC_FREE(tmp_ctx);
-               return False;
+               return false;
        }
 
        /*
@@ -426,16 +445,16 @@ static bool wb_lookup_rids(TALLOC_CTX *mem_ctx,
        for (i=0; i<num_rids; i++) {
                if (my_names[i] == NULL) {
                        TALLOC_FREE(tmp_ctx);
-                       return False;
+                       return false;
                }
                if (!(names[i] = talloc_strdup(names, my_names[i]))) {
                        TALLOC_FREE(tmp_ctx);
-                       return False;
+                       return false;
                }
                types[i] = my_types[i];
        }
        TALLOC_FREE(tmp_ctx);
-       return True;
+       return true;
 }
 
 static bool lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
@@ -445,12 +464,15 @@ static bool lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
 {
        int i;
 
+       DEBUG(10, ("lookup_rids called for domain sid '%s'\n",
+                  sid_string_dbg(domain_sid)));
+
        if (num_rids) {
                *names = TALLOC_ARRAY(mem_ctx, const char *, num_rids);
                *types = TALLOC_ARRAY(mem_ctx, enum lsa_SidType, num_rids);
 
                if ((*names == NULL) || (*types == NULL)) {
-                       return False;
+                       return false;
                }
        } else {
                *names = NULL;
@@ -466,7 +488,7 @@ static bool lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
                }
 
                if (*domain_name == NULL) {
-                       return False;
+                       return false;
                }
 
                become_root();
@@ -487,21 +509,21 @@ static bool lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
                }
 
                if (*domain_name == NULL) {
-                       return False;
+                       return false;
                }
 
                for (i=0; i<num_rids; i++) {
                        if (lookup_builtin_rid(*names, rids[i],
                                               &(*names)[i])) {
                                if ((*names)[i] == NULL) {
-                                       return False;
+                                       return false;
                                }
                                (*types)[i] = SID_NAME_ALIAS;
                        } else {
                                (*types)[i] = SID_NAME_UNKNOWN;
                        }
                }
-               return True;
+               return true;
        }
 
        if (sid_check_is_wellknown_domain(domain_sid, NULL)) {
@@ -512,40 +534,52 @@ static bool lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
                        if (lookup_wellknown_sid(mem_ctx, &sid,
                                                 domain_name, &(*names)[i])) {
                                if ((*names)[i] == NULL) {
-                                       return False;
+                                       return false;
                                }
                                (*types)[i] = SID_NAME_WKN_GRP;
                        } else {
                                (*types)[i] = SID_NAME_UNKNOWN;
                        }
                }
-               return True;
+               return true;
        }
 
        if (sid_check_is_unix_users(domain_sid)) {
                if (*domain_name == NULL) {
                        *domain_name = talloc_strdup(
                                mem_ctx, unix_users_domain_name());
+                       if (*domain_name == NULL) {
+                               return false;
+                       }
                }
                for (i=0; i<num_rids; i++) {
                        (*names)[i] = talloc_strdup(
                                (*names), uidtoname(rids[i]));
+                       if ((*names)[i] == NULL) {
+                               return false;
+                       }
                        (*types)[i] = SID_NAME_USER;
                }
-               return True;
+               return true;
        }
 
        if (sid_check_is_unix_groups(domain_sid)) {
                if (*domain_name == NULL) {
                        *domain_name = talloc_strdup(
                                mem_ctx, unix_groups_domain_name());
+                       if (*domain_name == NULL) {
+                               return false;
+                       }
                }
                for (i=0; i<num_rids; i++) {
                        (*names)[i] = talloc_strdup(
                                (*names), gidtoname(rids[i]));
+                       if ((*names)[i] == NULL) {
+                               return false;
+                       }
                        (*types)[i] = SID_NAME_DOM_GRP;
                }
-               return True;
+               return true;
        }
 
        return wb_lookup_rids(mem_ctx, domain_sid, num_rids, rids,
@@ -564,22 +598,32 @@ static bool lookup_as_domain(const DOM_SID *sid, TALLOC_CTX *mem_ctx,
 
        if (sid_check_is_domain(sid)) {
                *name = talloc_strdup(mem_ctx, get_global_sam_name());
-               return True;
+               return true;
        }
 
        if (sid_check_is_builtin(sid)) {
                *name = talloc_strdup(mem_ctx, builtin_domain_name());
-               return True;
+               return true;
        }
 
        if (sid_check_is_wellknown_domain(sid, &tmp)) {
                *name = talloc_strdup(mem_ctx, tmp);
-               return True;
+               return true;
+       }
+
+       if (sid_check_is_unix_users(sid)) {
+               *name = talloc_strdup(mem_ctx, unix_users_domain_name());
+               return true;
+       }
+
+       if (sid_check_is_unix_groups(sid)) {
+               *name = talloc_strdup(mem_ctx, unix_groups_domain_name());
+               return true;
        }
 
        if (sid->num_auths != 4) {
                /* This can't be a domain */
-               return False;
+               return false;
        }
 
        if (IS_DC) {
@@ -593,26 +637,26 @@ static bool lookup_as_domain(const DOM_SID *sid, TALLOC_CTX *mem_ctx,
                if (!NT_STATUS_IS_OK(pdb_enum_trusteddoms(mem_ctx,
                                                          &num_domains,
                                                          &domains))) {
-                       return False;
+                       return false;
                }
 
                for (i=0; i<num_domains; i++) {
                        if (sid_equal(sid, &domains[i]->sid)) {
                                *name = talloc_strdup(mem_ctx,
                                                      domains[i]->name);
-                               return True;
+                               return true;
                        }
                }
-               return False;
+               return false;
        }
 
        if (winbind_lookup_sid(mem_ctx, sid, &tmp, NULL, &type) &&
            (type == SID_NAME_DOMAIN)) {
                *name = tmp;
-               return True;
+               return true;
        }
 
-       return False;
+       return false;
 }
 
 /*
@@ -636,11 +680,11 @@ static bool lookup_as_domain(const DOM_SID *sid, TALLOC_CTX *mem_ctx,
 
 static bool check_dom_sid_to_level(const DOM_SID *sid, int level)
 {
-       int ret = False;
+       int ret = false;
 
        switch(level) {
        case 1:
-               ret = True;
+               ret = true;
                break;
        case 2:
                ret = (!sid_check_is_builtin(sid) &&
@@ -652,13 +696,13 @@ static bool check_dom_sid_to_level(const DOM_SID *sid, int level)
                ret = sid_check_is_domain(sid);
                break;
        case 5:
-               ret = False;
+               ret = false;
                break;
        }
 
        DEBUG(10, ("%s SID %s in level %d\n",
                   ret ? "Accepting" : "Rejecting",
-                  sid_string_static(sid), level));
+                  sid_string_dbg(sid), level));
        return ret;
 }
 
@@ -702,7 +746,7 @@ NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
        }
 
        dom_infos = TALLOC_ZERO_ARRAY(mem_ctx, struct lsa_dom_info,
-                                     MAX_REF_DOMAINS);
+                                     LSA_REF_DOMAIN_LIST_MULTIPLIER);
        if (dom_infos == NULL) {
                result = NT_STATUS_NO_MEMORY;
                goto fail;
@@ -760,7 +804,7 @@ NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
                } else {
                        /* This is a normal SID with rid component */
                        if (!sid_split_rid(&sid, &rid)) {
-                               result = NT_STATUS_INVALID_PARAMETER;
+                               result = NT_STATUS_INVALID_SID;
                                goto fail;
                        }
                }
@@ -772,7 +816,7 @@ NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
                        continue;
                }
 
-               for (j=0; j<MAX_REF_DOMAINS; j++) {
+               for (j=0; j<LSA_REF_DOMAIN_LIST_MULTIPLIER; j++) {
                        if (!dom_infos[j].valid) {
                                break;
                        }
@@ -781,7 +825,7 @@ NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
                        }
                }
 
-               if (j == MAX_REF_DOMAINS) {
+               if (j == LSA_REF_DOMAIN_LIST_MULTIPLIER) {
                        /* TODO: What's the right error message here? */
                        result = NT_STATUS_NONE_MAPPED;
                        goto fail;
@@ -790,7 +834,7 @@ NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
                if (!dom_infos[j].valid) {
                        /* We found a domain not yet referenced, create a new
                         * ref. */
-                       dom_infos[j].valid = True;
+                       dom_infos[j].valid = true;
                        sid_copy(&dom_infos[j].sid, &sid);
 
                        if (domain_name != NULL) {
@@ -825,7 +869,7 @@ NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
 
        /* Iterate over the domains found */
 
-       for (i=0; i<MAX_REF_DOMAINS; i++) {
+       for (i=0; i<LSA_REF_DOMAIN_LIST_MULTIPLIER; i++) {
                uint32_t *rids;
                const char *domain_name = NULL;
                const char **names;
@@ -901,11 +945,13 @@ bool lookup_sid(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
        struct lsa_dom_info *domain;
        struct lsa_name_info *name;
        TALLOC_CTX *tmp_ctx;
-       bool ret = False;
+       bool ret = false;
+
+       DEBUG(10, ("lookup_sid called for SID '%s'\n", sid_string_dbg(sid)));
 
        if (!(tmp_ctx = talloc_new(mem_ctx))) {
                DEBUG(0, ("talloc_new failed\n"));
-               return False;
+               return false;
        }
 
        if (!NT_STATUS_IS_OK(lookup_sids(tmp_ctx, 1, &sid, 1,
@@ -931,16 +977,14 @@ bool lookup_sid(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
                *ret_type = name->type;
        }
 
-       ret = True;
+       ret = true;
 
  done:
        if (ret) {
-               DEBUG(10, ("Sid %s -> %s\\%s(%d)\n",
-                          sid_string_static(sid), domain->name,
-                          name->name, name->type));
+               DEBUG(10, ("Sid %s -> %s\\%s(%d)\n", sid_string_dbg(sid),
+                          domain->name, name->name, name->type));
        } else {
-               DEBUG(10, ("failed to lookup sid %s\n",
-                          sid_string_static(sid)));
+               DEBUG(10, ("failed to lookup sid %s\n", sid_string_dbg(sid)));
        }
        TALLOC_FREE(tmp_ctx);
        return ret;
@@ -954,184 +998,114 @@ bool lookup_sid(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
  modified to use linked lists by jra.
 *****************************************************************/  
 
-#define MAX_UID_SID_CACHE_SIZE 100
-#define TURNOVER_UID_SID_CACHE_SIZE 10
-#define MAX_GID_SID_CACHE_SIZE 100
-#define TURNOVER_GID_SID_CACHE_SIZE 10
-
-static size_t n_uid_sid_cache = 0;
-static size_t n_gid_sid_cache = 0;
-
-static struct uid_sid_cache {
-       struct uid_sid_cache *next, *prev;
-       uid_t uid;
-       DOM_SID sid;
-       enum lsa_SidType sidtype;
-} *uid_sid_cache_head;
-
-static struct gid_sid_cache {
-       struct gid_sid_cache *next, *prev;
-       gid_t gid;
-       DOM_SID sid;
-       enum lsa_SidType sidtype;
-} *gid_sid_cache_head;
-
 /*****************************************************************
   Find a SID given a uid.
-*****************************************************************/  
+*****************************************************************/
 
 static bool fetch_sid_from_uid_cache(DOM_SID *psid, uid_t uid)
 {
-       struct uid_sid_cache *pc;
-
-       for (pc = uid_sid_cache_head; pc; pc = pc->next) {
-               if (pc->uid == uid) {
-                       *psid = pc->sid;
-                       DEBUG(3,("fetch sid from uid cache %u -> %s\n",
-                                (unsigned int)uid, sid_string_static(psid)));
-                       DLIST_PROMOTE(uid_sid_cache_head, pc);
-                       return True;
-               }
+       DATA_BLOB cache_value;
+
+       if (!memcache_lookup(NULL, UID_SID_CACHE,
+                            data_blob_const(&uid, sizeof(uid)),
+                            &cache_value)) {
+               return false;
        }
-       return False;
+
+       memcpy(psid, cache_value.data, MIN(sizeof(*psid), cache_value.length));
+       SMB_ASSERT(cache_value.length >= offsetof(struct dom_sid, id_auth));
+       SMB_ASSERT(cache_value.length == ndr_size_dom_sid(psid, NULL, 0));
+
+       return true;
 }
 
 /*****************************************************************
   Find a uid given a SID.
-*****************************************************************/  
+*****************************************************************/
 
 static bool fetch_uid_from_cache( uid_t *puid, const DOM_SID *psid )
 {
-       struct uid_sid_cache *pc;
-
-       for (pc = uid_sid_cache_head; pc; pc = pc->next) {
-               if (sid_compare(&pc->sid, psid) == 0) {
-                       *puid = pc->uid;
-                       DEBUG(3,("fetch uid from cache %u -> %s\n",
-                                (unsigned int)*puid, sid_string_static(psid)));
-                       DLIST_PROMOTE(uid_sid_cache_head, pc);
-                       return True;
-               }
+       DATA_BLOB cache_value;
+
+       if (!memcache_lookup(NULL, SID_UID_CACHE,
+                            data_blob_const(psid, ndr_size_dom_sid(psid, NULL, 0)),
+                            &cache_value)) {
+               return false;
        }
-       return False;
+
+       SMB_ASSERT(cache_value.length == sizeof(*puid));
+       memcpy(puid, cache_value.data, sizeof(*puid));
+
+       return true;
 }
 
 /*****************************************************************
  Store uid to SID mapping in cache.
-*****************************************************************/  
+*****************************************************************/
 
 void store_uid_sid_cache(const DOM_SID *psid, uid_t uid)
 {
-       struct uid_sid_cache *pc;
-
-       /* do not store SIDs in the "Unix Group" domain */
-       
-       if ( sid_check_is_in_unix_users( psid ) )
-               return;
-
-       if (n_uid_sid_cache >= MAX_UID_SID_CACHE_SIZE && n_uid_sid_cache > TURNOVER_UID_SID_CACHE_SIZE) {
-               /* Delete the last TURNOVER_UID_SID_CACHE_SIZE entries. */
-               struct uid_sid_cache *pc_next;
-               size_t i;
-
-               for (i = 0, pc = uid_sid_cache_head; i < (n_uid_sid_cache - TURNOVER_UID_SID_CACHE_SIZE); i++, pc = pc->next)
-                       ;
-               for(; pc; pc = pc_next) {
-                       pc_next = pc->next;
-                       DLIST_REMOVE(uid_sid_cache_head,pc);
-                       SAFE_FREE(pc);
-                       n_uid_sid_cache--;
-               }
-       }
-
-       pc = SMB_MALLOC_P(struct uid_sid_cache);
-       if (!pc)
-               return;
-       pc->uid = uid;
-       sid_copy(&pc->sid, psid);
-       DLIST_ADD(uid_sid_cache_head, pc);
-       n_uid_sid_cache++;
+       memcache_add(NULL, SID_UID_CACHE,
+                    data_blob_const(psid, ndr_size_dom_sid(psid, NULL, 0)),
+                    data_blob_const(&uid, sizeof(uid)));
+       memcache_add(NULL, UID_SID_CACHE,
+                    data_blob_const(&uid, sizeof(uid)),
+                    data_blob_const(psid, ndr_size_dom_sid(psid, NULL, 0)));
 }
 
 /*****************************************************************
   Find a SID given a gid.
-*****************************************************************/  
+*****************************************************************/
 
 static bool fetch_sid_from_gid_cache(DOM_SID *psid, gid_t gid)
 {
-       struct gid_sid_cache *pc;
-
-       for (pc = gid_sid_cache_head; pc; pc = pc->next) {
-               if (pc->gid == gid) {
-                       *psid = pc->sid;
-                       DEBUG(3,("fetch sid from gid cache %u -> %s\n",
-                                (unsigned int)gid, sid_string_static(psid)));
-                       DLIST_PROMOTE(gid_sid_cache_head, pc);
-                       return True;
-               }
+       DATA_BLOB cache_value;
+
+       if (!memcache_lookup(NULL, GID_SID_CACHE,
+                            data_blob_const(&gid, sizeof(gid)),
+                            &cache_value)) {
+               return false;
        }
-       return False;
+
+       memcpy(psid, cache_value.data, MIN(sizeof(*psid), cache_value.length));
+       SMB_ASSERT(cache_value.length >= offsetof(struct dom_sid, id_auth));
+       SMB_ASSERT(cache_value.length == ndr_size_dom_sid(psid, NULL, 0));
+
+       return true;
 }
 
 /*****************************************************************
   Find a gid given a SID.
-*****************************************************************/  
+*****************************************************************/
 
 static bool fetch_gid_from_cache(gid_t *pgid, const DOM_SID *psid)
 {
-       struct gid_sid_cache *pc;
-
-       for (pc = gid_sid_cache_head; pc; pc = pc->next) {
-               if (sid_compare(&pc->sid, psid) == 0) {
-                       *pgid = pc->gid;
-                       DEBUG(3,("fetch gid from cache %u -> %s\n",
-                                (unsigned int)*pgid, sid_string_static(psid)));
-                       DLIST_PROMOTE(gid_sid_cache_head, pc);
-                       return True;
-               }
+       DATA_BLOB cache_value;
+
+       if (!memcache_lookup(NULL, SID_UID_CACHE,
+                            data_blob_const(psid, ndr_size_dom_sid(psid, NULL, 0)),
+                            &cache_value)) {
+               return false;
        }
-       return False;
+
+       SMB_ASSERT(cache_value.length == sizeof(*pgid));
+       memcpy(pgid, cache_value.data, sizeof(*pgid));
+
+       return true;
 }
 
 /*****************************************************************
  Store gid to SID mapping in cache.
-*****************************************************************/  
+*****************************************************************/
 
 void store_gid_sid_cache(const DOM_SID *psid, gid_t gid)
 {
-       struct gid_sid_cache *pc;
-       
-       /* do not store SIDs in the "Unix Group" domain */
-       
-       if ( sid_check_is_in_unix_groups( psid ) )
-               return;
-
-       if (n_gid_sid_cache >= MAX_GID_SID_CACHE_SIZE && n_gid_sid_cache > TURNOVER_GID_SID_CACHE_SIZE) {
-               /* Delete the last TURNOVER_GID_SID_CACHE_SIZE entries. */
-               struct gid_sid_cache *pc_next;
-               size_t i;
-
-               for (i = 0, pc = gid_sid_cache_head; i < (n_gid_sid_cache - TURNOVER_GID_SID_CACHE_SIZE); i++, pc = pc->next)
-                       ;
-               for(; pc; pc = pc_next) {
-                       pc_next = pc->next;
-                       DLIST_REMOVE(gid_sid_cache_head,pc);
-                       SAFE_FREE(pc);
-                       n_gid_sid_cache--;
-               }
-       }
-
-       pc = SMB_MALLOC_P(struct gid_sid_cache);
-       if (!pc)
-               return;
-       pc->gid = gid;
-       sid_copy(&pc->sid, psid);
-       DLIST_ADD(gid_sid_cache_head, pc);
-
-       DEBUG(3,("store_gid_sid_cache: gid %u in cache -> %s\n", (unsigned int)gid,
-               sid_string_static(psid)));
-
-       n_gid_sid_cache++;
+       memcache_add(NULL, SID_GID_CACHE,
+                    data_blob_const(psid, ndr_size_dom_sid(psid, NULL, 0)),
+                    data_blob_const(&gid, sizeof(gid)));
+       memcache_add(NULL, GID_SID_CACHE,
+                    data_blob_const(&gid, sizeof(gid)),
+                    data_blob_const(psid, ndr_size_dom_sid(psid, NULL, 0)));
 }
 
 /*****************************************************************
@@ -1162,7 +1136,7 @@ static void legacy_uid_to_sid(DOM_SID *psid, uid_t uid)
 
  done:
        DEBUG(10,("LEGACY: uid %u -> sid %s\n", (unsigned int)uid,
-                 sid_string_static(psid)));
+                 sid_string_dbg(psid)));
 
        store_uid_sid_cache(psid, uid);
        return;
@@ -1193,7 +1167,7 @@ static void legacy_gid_to_sid(DOM_SID *psid, gid_t gid)
 
  done:
        DEBUG(10,("LEGACY: gid %u -> sid %s\n", (unsigned int)gid,
-                 sid_string_static(psid)));
+                 sid_string_dbg(psid)));
 
        store_gid_sid_cache(psid, gid);
        return;
@@ -1219,9 +1193,9 @@ static bool legacy_sid_to_uid(const DOM_SID *psid, uid_t *puid)
                if (ret) {
                        if (type != SID_NAME_USER) {
                                DEBUG(5, ("sid %s is a %s, expected a user\n",
-                                         sid_string_static(psid),
+                                         sid_string_dbg(psid),
                                          sid_type_lookup(type)));
-                               return False;
+                               return false;
                        }
                        *puid = id.uid;
                        goto done;
@@ -1230,15 +1204,16 @@ static bool legacy_sid_to_uid(const DOM_SID *psid, uid_t *puid)
                /* This was ours, but it was not mapped.  Fail */
        }
 
-       DEBUG(10,("LEGACY: mapping failed for sid %s\n", sid_string_static(psid)));
-       return False;
+       DEBUG(10,("LEGACY: mapping failed for sid %s\n",
+                 sid_string_dbg(psid)));
+       return false;
 
 done:
-       DEBUG(10,("LEGACY: sid %s -> uid %u\n", sid_string_static(psid),
-               (unsigned int)*puid ));
+       DEBUG(10,("LEGACY: sid %s -> uid %u\n", sid_string_dbg(psid),
+                 (unsigned int)*puid ));
 
        store_uid_sid_cache(psid, *puid);
-       return True;
+       return true;
 }
 
 /*****************************************************************
@@ -1265,8 +1240,9 @@ static bool legacy_sid_to_gid(const DOM_SID *psid, gid_t *pgid)
                        *pgid = map.gid;
                        goto done;
                }
-               DEBUG(10,("LEGACY: mapping failed for sid %s\n", sid_string_static(psid)));
-               return False;
+               DEBUG(10,("LEGACY: mapping failed for sid %s\n",
+                         sid_string_dbg(psid)));
+               return false;
        }
 
        if (sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
@@ -1279,10 +1255,10 @@ static bool legacy_sid_to_gid(const DOM_SID *psid, gid_t *pgid)
                if (ret) {
                        if ((type != SID_NAME_DOM_GRP) &&
                            (type != SID_NAME_ALIAS)) {
-                               DEBUG(5, ("LEGACY: sid %s is a %s, expected a group\n",
-                                         sid_string_static(psid),
+                               DEBUG(5, ("LEGACY: sid %s is a %s, expected "
+                                         "a group\n", sid_string_dbg(psid),
                                          sid_type_lookup(type)));
-                               return False;
+                               return false;
                        }
                        *pgid = id.gid;
                        goto done;
@@ -1291,16 +1267,17 @@ static bool legacy_sid_to_gid(const DOM_SID *psid, gid_t *pgid)
                /* This was ours, but it was not mapped.  Fail */
        }
 
-       DEBUG(10,("LEGACY: mapping failed for sid %s\n", sid_string_static(psid)));
-       return False;
+       DEBUG(10,("LEGACY: mapping failed for sid %s\n",
+                 sid_string_dbg(psid)));
+       return false;
        
  done:
-       DEBUG(10,("LEGACY: sid %s -> gid %u\n", sid_string_static(psid),
+       DEBUG(10,("LEGACY: sid %s -> gid %u\n", sid_string_dbg(psid),
                  (unsigned int)*pgid ));
 
        store_gid_sid_cache(psid, *pgid);
 
-       return True;
+       return true;
 }
 
 /*****************************************************************
@@ -1309,24 +1286,48 @@ static bool legacy_sid_to_gid(const DOM_SID *psid, gid_t *pgid)
 
 void uid_to_sid(DOM_SID *psid, uid_t uid)
 {
+       bool expired = true;
+       bool ret;
        ZERO_STRUCTP(psid);
 
        if (fetch_sid_from_uid_cache(psid, uid))
                return;
 
-       if (!winbind_uid_to_sid(psid, uid)) {
-               if (!winbind_ping()) {
+       /* Check the winbindd cache directly. */
+       ret = idmap_cache_find_uid2sid(uid, psid, &expired);
+
+       if (ret && !expired && 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)) {
+                       /*
+                        * We shouldn't return the NULL SID
+                        * here if winbind was running and
+                        * couldn't map, as winbind will have
+                        * added a negative entry that will
+                        * cause us to go though the
+                        * legacy_uid_to_sid()
+                        * function anyway in the case above
+                        * the next time we ask.
+                        */
+                       DEBUG(5, ("uid_to_sid: winbind failed to find a sid "
+                                 "for uid %u\n", (unsigned int)uid));
+
                        legacy_uid_to_sid(psid, uid);
                        return;
                }
-
-               DEBUG(5, ("uid_to_sid: winbind failed to find a sid for uid %u\n",
-                       uid));
-               return;
        }
 
-       DEBUG(10,("uid %u -> sid %s\n",
-                 (unsigned int)uid, sid_string_static(psid)));
+       DEBUG(10,("uid %u -> sid %s\n", (unsigned int)uid,
+                 sid_string_dbg(psid)));
 
        store_uid_sid_cache(psid, uid);
        return;
@@ -1338,25 +1339,49 @@ void uid_to_sid(DOM_SID *psid, uid_t uid)
 
 void gid_to_sid(DOM_SID *psid, gid_t gid)
 {
+       bool expired = true;
+       bool ret;
        ZERO_STRUCTP(psid);
 
        if (fetch_sid_from_gid_cache(psid, gid))
                return;
 
-       if (!winbind_gid_to_sid(psid, gid)) {
-               if (!winbind_ping()) {
+       /* Check the winbindd cache directly. */
+       ret = idmap_cache_find_gid2sid(gid, psid, &expired);
+
+       if (ret && !expired && 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)) {
+                       /*
+                        * We shouldn't return the NULL SID
+                        * here if winbind was running and
+                        * couldn't map, as winbind will have
+                        * added a negative entry that will
+                        * cause us to go though the
+                        * legacy_gid_to_sid()
+                        * function anyway in the case above
+                        * the next time we ask.
+                        */
+                       DEBUG(5, ("gid_to_sid: winbind failed to find a sid "
+                                 "for gid %u\n", (unsigned int)gid));
+
                        legacy_gid_to_sid(psid, gid);
                        return;
                }
-
-               DEBUG(5, ("gid_to_sid: winbind failed to find a sid for gid %u\n",
-                       gid));
-               return;
        }
 
-       DEBUG(10,("gid %u -> sid %s\n",
-                 (unsigned int)gid, sid_string_static(psid)));
-       
+       DEBUG(10,("gid %u -> sid %s\n", (unsigned int)gid,
+                 sid_string_dbg(psid)));
+
        store_gid_sid_cache(psid, gid);
        return;
 }
@@ -1367,14 +1392,16 @@ void gid_to_sid(DOM_SID *psid, gid_t gid)
 
 bool sid_to_uid(const DOM_SID *psid, uid_t *puid)
 {
+       bool expired = true;
+       bool ret;
        uint32 rid;
        gid_t gid;
 
        if (fetch_uid_from_cache(puid, psid))
-               return True;
+               return true;
 
        if (fetch_gid_from_cache(&gid, psid)) {
-               return False;
+               return false;
        }
 
        /* Optimize for the Unix Users Domain
@@ -1384,29 +1411,43 @@ bool sid_to_uid(const DOM_SID *psid, uid_t *puid)
                *puid = uid;
 
                /* return here, don't cache */
-               DEBUG(10,("sid %s -> uid %u\n", sid_string_static(psid),
+               DEBUG(10,("sid %s -> uid %u\n", sid_string_dbg(psid),
                        (unsigned int)*puid ));
-               return True;
+               return true;
        }
 
-       if (!winbind_sid_to_uid(puid, psid)) {
-               if (!winbind_ping()) {
-                       return legacy_sid_to_uid(psid, puid);
-               }
+       /* Check the winbindd cache directly. */
+       ret = idmap_cache_find_sid2uid(psid, puid, &expired);
 
-               DEBUG(5, ("winbind failed to find a uid for sid %s\n",
-                         sid_string_static(psid)));
-               return False;
+       if (ret && !expired && (*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()) {
+                               return legacy_sid_to_uid(psid, puid);
+                       }
+
+                       DEBUG(5, ("winbind failed to find a uid for sid %s\n",
+                                 sid_string_dbg(psid)));
+                       return false;
+               }
        }
 
        /* TODO: Here would be the place to allocate both a gid and a uid for
         * the SID in question */
 
-       DEBUG(10,("sid %s -> uid %u\n", sid_string_static(psid),
+       DEBUG(10,("sid %s -> uid %u\n", sid_string_dbg(psid),
                (unsigned int)*puid ));
 
        store_uid_sid_cache(psid, *puid);
-       return True;
+       return true;
 }
 
 /*****************************************************************
@@ -1416,14 +1457,16 @@ bool sid_to_uid(const DOM_SID *psid, uid_t *puid)
 
 bool sid_to_gid(const DOM_SID *psid, gid_t *pgid)
 {
+       bool expired = true;
+       bool ret;
        uint32 rid;
        uid_t uid;
 
        if (fetch_gid_from_cache(pgid, psid))
-               return True;
+               return true;
 
        if (fetch_uid_from_cache(&uid, psid))
-               return False;
+               return false;
 
        /* Optimize for the Unix Groups Domain
         * as the conversion is straightforward */
@@ -1432,29 +1475,41 @@ bool sid_to_gid(const DOM_SID *psid, gid_t *pgid)
                *pgid = gid;
 
                /* return here, don't cache */
-               DEBUG(10,("sid %s -> gid %u\n", sid_string_static(psid),
+               DEBUG(10,("sid %s -> gid %u\n", sid_string_dbg(psid),
                        (unsigned int)*pgid ));
-               return True;
+               return true;
        }
 
-       /* Ask winbindd if it can map this sid to a gid.
-        * (Idmap will check it is a valid SID and of the right type) */
+       /* Check the winbindd cache directly. */
+       ret = idmap_cache_find_sid2gid(psid, pgid, &expired);
 
-       if ( !winbind_sid_to_gid(pgid, psid) ) {
-               if (!winbind_ping()) {
-                       return legacy_sid_to_gid(psid, pgid);
-               }
+       if (ret && !expired && (*pgid == (gid_t)-1)) {
+               /*
+                * Negative cache entry, we already asked.
+                * do legacy.
+                */
+               return legacy_sid_to_gid(psid, pgid);
+       }
 
-               DEBUG(10,("winbind failed to find a gid for sid %s\n",
-                                       sid_string_static(psid)));
-               return False;
+       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) */
+
+               if ( !winbind_sid_to_gid(pgid, psid) ) {
+                       if (!winbind_ping()) {
+                               return legacy_sid_to_gid(psid, pgid);
+                       }
+
+                       DEBUG(10,("winbind failed to find a gid for sid %s\n",
+                                 sid_string_dbg(psid)));
+                       return false;
+               }
        }
 
-       DEBUG(10,("sid %s -> gid %u\n", sid_string_static(psid),
+       DEBUG(10,("sid %s -> gid %u\n", sid_string_dbg(psid),
                  (unsigned int)*pgid ));
 
        store_gid_sid_cache(psid, *pgid);
-       
-       return True;
+       return true;
 }
-