sidgen: ignore staged users when generating SIDs

Staged users have

  uidNumber: -1
  gidNumber: -1
  ipaUniqueID: autogenerate

We cannot generate ipaSecurityIdentifier based on those UID/GID numbers.
However, '-1' value will trigger an error

 find_sid_for_ldap_entry - [file ipa_sidgen_common.c, line 483]: ID value too large.

And that, in turn, will cause stopping SID generation for all users.

Detect 'ipaUniqueID: autogenerate' situation and ignore these entries.

Fixes: https://pagure.io/freeipa/issue/9517

Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>

daemons/ipa-slapi-plugins/ipa-sidgen/ipa_sidgen.h

@@ -45,6 +45,8 @@
 #define UID_NUMBER "uidnumber"
 #define GID_NUMBER "gidnumber"
 #define IPA_SID "ipantsecurityidentifier"
+#define IPA_UNIQUEID "ipauniqueid"
+#define IPA_UNIQUEID_AUTOGENERATE "autogenerate"
 #define DOM_ATTRS_FILTER OBJECTCLASS"=ipantdomainattrs"
 #define DOMAIN_ID_RANGE_FILTER OBJECTCLASS"=ipadomainidrange"
 #define POSIX_ACCOUNT "posixaccount"

daemons/ipa-slapi-plugins/ipa-sidgen/ipa_sidgen_common.c

@@ -454,6 +454,7 @@ int find_sid_for_ldap_entry(struct slapi_entry *entry,
     uint32_t id;
     char *sid = NULL;
     char **objectclasses = NULL;
+    char *uniqueid = NULL;
     Slapi_PBlock *mod_pb = NULL;
     Slapi_Mods *smods = NULL;
     int result;
@@ -479,6 +480,16 @@ int find_sid_for_ldap_entry(struct slapi_entry *entry,
         goto done;
     }
 
+    uniqueid = slapi_entry_attr_get_charptr(entry, IPA_UNIQUEID);
+    if (uniqueid != NULL &&
+        strncmp(IPA_UNIQUEID_AUTOGENERATE, uniqueid,
+                sizeof(IPA_UNIQUEID_AUTOGENERATE)) == 0) {
+        LOG("Staged entry [%s] does not have Posix IDs, nothing to do.\n",
+            dn_str);
+        ret = 0;
+        goto done;
+    }
+
     if (uid_number >= UINT32_MAX || gid_number >= UINT32_MAX) {
         LOG_FATAL("ID value too large.\n");
         ret = LDAP_CONSTRAINT_VIOLATION;
@@ -554,6 +565,7 @@ int find_sid_for_ldap_entry(struct slapi_entry *entry,
     }
 
 done:
+    slapi_ch_free_string(&uniqueid);
     slapi_ch_free_string(&sid);
     slapi_pblock_destroy(mod_pb);
     slapi_mods_free(&smods);