LDAP: Only convert direct parents' ghost attribute to member

https://fedorahosted.org/sssd/ticket/1612

This patch changes the handling of ghost attributes when saving the
actual user entry. Instead of always linking all groups that contained
the ghost attribute with the new user entry, the original member
attributes are now saved in the group object and the user entry is only
linked with its direct parents.

As the member attribute is compared against the originalDN of the user,
if either the originalDN or the originalMember attributes are missing,
the user object is linked with all the groups as a fallback.

The original member attributes are only saved if the LDAP schema
supports nesting.

2 files changed, 38 insertions, 8 deletions

diff --git a/src/providers/ldap/sdap_async_groups.c b/src/providers/ldap/sdap_async_groups.c
index 788c9992..b635dc2a 100644
--- a/src/providers/ldap/sdap_async_groups.c
+++ b/src/providers/ldap/sdap_async_groups.c
@@ -205,6 +205,7 @@ sdap_process_ghost_members(struct sysdb_attrs *attrs,
                            struct sdap_options *opts,
                            hash_table_t *ghosts,
                            bool populate_members,
+                           bool store_original_member,
                            struct sysdb_attrs *sysdb_attrs)
 {
     errno_t ret;
@@ -235,6 +236,19 @@ sdap_process_ghost_members(struct sysdb_attrs *attrs,
         return ret;
     }
 
+    if (store_original_member) {
+        DEBUG(SSSDBG_TRACE_FUNC, ("The group has %d members\n", memberel->num_values));
+        for (i = 0; i < memberel->num_values; i++) {
+            ret = sysdb_attrs_add_string(sysdb_attrs, SYSDB_ORIG_MEMBER,
+                                        (const char *) memberel->values[i].data);
+            if (ret) {
+                DEBUG(SSSDBG_OP_FAILURE, ("Could not add member [%s]\n",
+                      (const char *) memberel->values[i].data));
+                return ret;
+            }
+        }
+    }
+
     if (populate_members) {
         ret = sysdb_attrs_get_el(sysdb_attrs, SYSDB_MEMBER, &sysdb_memberel);
         if (ret != EOK) {
@@ -301,6 +315,7 @@ static int sdap_save_group(TALLOC_CTX *memctx,
                            struct sss_domain_info *dom,
                            struct sysdb_attrs *attrs,
                            bool populate_members,
+                           bool store_original_member,
                            hash_table_t *ghosts,
                            char **_usn_value,
                            time_t now)
@@ -475,7 +490,8 @@ static int sdap_save_group(TALLOC_CTX *memctx,
     }
 
     ret = sdap_process_ghost_members(attrs, opts, ghosts,
-                                     populate_members, group_attrs);
+                                     populate_members, store_original_member,
+                                     group_attrs);
     if (ret != EOK) {
         DEBUG(SSSDBG_OP_FAILURE, ("Failed to save ghost members\n"));
         goto fail;
@@ -598,6 +614,7 @@ static int sdap_save_groups(TALLOC_CTX *memctx,
     char *higher_usn = NULL;
     char *usn_value;
     bool twopass;
+    bool has_nesting = false;
     int ret;
     errno_t sret;
     int i;
@@ -615,6 +632,7 @@ static int sdap_save_groups(TALLOC_CTX *memctx,
     case SDAP_SCHEMA_IPA_V1:
     case SDAP_SCHEMA_AD:
         twopass = true;
+        has_nesting = true;
         break;
 
     default:
@@ -649,8 +667,8 @@ static int sdap_save_groups(TALLOC_CTX *memctx,
         /* if 2 pass savemembers = false */
         ret = sdap_save_group(tmpctx, sysdb,
                               opts, dom, groups[i],
-                              populate_members, ghosts,
-                              &usn_value, now);
+                              populate_members, has_nesting,
+                              ghosts, &usn_value, now);
 
         /* Do not fail completely on errors.
          * Just report the failure to save and go on */
diff --git a/src/providers/ldap/sdap_async_users.c b/src/providers/ldap/sdap_async_users.c
index e2e7b72d..5304c624 100644
--- a/src/providers/ldap/sdap_async_users.c
+++ b/src/providers/ldap/sdap_async_users.c
@@ -47,6 +47,7 @@ int sdap_save_user(TALLOC_CTX *memctx,
     const char *gecos;
     const char *homedir;
     const char *shell;
+    const char *orig_dn;
     uid_t uid;
     gid_t gid, primary_gid;
     struct sysdb_attrs *user_attrs;
@@ -241,12 +242,23 @@ int sdap_save_user(TALLOC_CTX *memctx,
         goto fail;
     }
 
-    ret = sdap_attrs_add_string(attrs, SYSDB_ORIG_DN,
-                                "original DN",
-                                name, user_attrs);
-    if (ret != EOK) {
+    ret = sysdb_attrs_get_el(attrs, SYSDB_ORIG_DN, &el);
+    if (ret) {
         goto fail;
     }
+    if (!el || el->num_values == 0) {
+        DEBUG(SSSDBG_MINOR_FAILURE,
+              ("originalDN is not available for [%s].\n", name));
+    } else {
+        orig_dn = (const char *) el->values[0].data;
+        DEBUG(SSSDBG_TRACE_INTERNAL, ("Adding originalDN [%s] to attributes "
+                "of [%s].\n", orig_dn, name));
+
+        ret = sysdb_attrs_add_string(user_attrs, SYSDB_ORIG_DN, orig_dn);
+        if (ret) {
+            goto fail;
+        }
+    }
 
     ret = sysdb_attrs_get_el(attrs, SYSDB_MEMBEROF, &el);
     if (ret) {
@@ -358,7 +370,7 @@ int sdap_save_user(TALLOC_CTX *memctx,
     DEBUG(6, ("Storing info for user %s\n", name));
 
     ret = sysdb_store_user(ctx, name, pwd, uid, gid, gecos, homedir, shell,
-                           user_attrs, missing, cache_timeout, now);
+                           orig_dn, user_attrs, missing, cache_timeout, now);
     if (ret) goto fail;
 
     if (_usn_value) {