AD: Detect domain controller compatibility version

3 files changed, 44 insertions, 0 deletions

diff --git a/src/providers/ldap/sdap.c b/src/providers/ldap/sdap.c
index 11ba9cf34..5c4a00557 100644
--- a/src/providers/ldap/sdap.c
+++ b/src/providers/ldap/sdap.c
@@ -903,6 +903,7 @@ int sdap_get_server_opts_from_rootdse(TALLOC_CTX *memctx,
     char *endptr = NULL;
     int ret;
     int i;
+    uint32_t dc_level;
 
     so = talloc_zero(memctx, struct sdap_server_opts);
     if (!so) {
@@ -974,6 +975,35 @@ int sdap_get_server_opts_from_rootdse(TALLOC_CTX *memctx,
                 }
             }
         }
+
+        /* Detect Active Directory version if available */
+        ret = sysdb_attrs_get_uint32_t(rootdse,
+                                       SDAP_ROOTDSE_ATTR_AD_VERSION,
+                                       &dc_level);
+        if (ret == EOK) {
+            /* Validate that the DC level matches an expected value */
+            switch(dc_level) {
+            case DS_BEHAVIOR_WIN2000:
+            case DS_BEHAVIOR_WIN2003:
+            case DS_BEHAVIOR_WIN2008:
+            case DS_BEHAVIOR_WIN2008R2:
+            case DS_BEHAVIOR_WIN2012:
+                opts->dc_functional_level = dc_level;
+                DEBUG(SSSDBG_CONF_SETTINGS,
+                      ("Setting AD compatibility level to [%d]\n",
+                       opts->dc_functional_level));
+                break;
+            default:
+                DEBUG(SSSDBG_MINOR_FAILURE,
+                      ("Received invalid value for AD compatibility level. "
+                       "Continuing without AD performance enhancements\n"));
+            }
+        } else if (ret != ENOENT) {
+            DEBUG(SSSDBG_MINOR_FAILURE,
+                  ("Error detecting Active Directory compatibility level "
+                   "(%s). Continuing without AD performance enhancements\n",
+                   strerror(ret)));
+        }
     }
 
     if (!last_usn_name) {
diff --git a/src/providers/ldap/sdap.h b/src/providers/ldap/sdap.h
index 01c33e421..d844ad636 100644
--- a/src/providers/ldap/sdap.h
+++ b/src/providers/ldap/sdap.h
@@ -129,6 +129,7 @@ struct sdap_ppolicy_data {
 
 #define SDAP_ROOTDSE_ATTR_NAMING_CONTEXTS "namingContexts"
 #define SDAP_ROOTDSE_ATTR_DEFAULT_NAMING_CONTEXT "defaultNamingContext"
+#define SDAP_ROOTDSE_ATTR_AD_VERSION "domainControllerFunctionality"
 
 #define SDAP_IPA_USN "entryUSN"
 #define SDAP_IPA_LAST_USN "lastUSN"
@@ -364,6 +365,17 @@ struct sdap_search_base {
     const char *filter;
 };
 
+/* Values from
+ * http://msdn.microsoft.com/en-us/library/cc223272%28v=prot.13%29.aspx
+ */
+enum dc_functional_level {
+    DS_BEHAVIOR_WIN2000 = 0,
+    DS_BEHAVIOR_WIN2003 = 2,
+    DS_BEHAVIOR_WIN2008 = 3,
+    DS_BEHAVIOR_WIN2008R2 = 4,
+    DS_BEHAVIOR_WIN2012 = 5
+};
+
 struct sdap_options {
     struct dp_option *basic;
     struct sdap_attr_map *gen_map;
@@ -397,6 +409,7 @@ struct sdap_options {
     struct sdap_search_base **autofs_search_bases;
 
     bool support_matching_rule;
+    enum dc_functional_level dc_functional_level;
 };
 
 struct sdap_server_opts {
diff --git a/src/providers/ldap/sdap_async.c b/src/providers/ldap/sdap_async.c
index 42c8dd680..e0440625d 100644
--- a/src/providers/ldap/sdap_async.c
+++ b/src/providers/ldap/sdap_async.c
@@ -855,6 +855,7 @@ struct tevent_req *sdap_get_rootdse_send(TALLOC_CTX *memctx,
             "supportedFeatures",
             "supportedLDAPVersion",
             "supportedSASLMechanisms",
+            SDAP_ROOTDSE_ATTR_AD_VERSION,
             SDAP_ROOTDSE_ATTR_DEFAULT_NAMING_CONTEXT,
             SDAP_IPA_LAST_USN, SDAP_AD_LAST_USN,
             NULL