IPA: do initgroups if extdom exop supports it

Newer versions of the extdom plugin return the full list of
group-memberships during a user lookup request. With these version there
is no need to reject a initgroups request for sub/trusted-domain users
anymore. This is e.g. useful for callers which call getgrouplist()
directly without calling getpwnam() before. Additionally it helps if for
some reasons the lifetime of the user entry and the lifetime of the
initgroups data is different.

Related to https://fedorahosted.org/sssd/ticket/2633

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit e87badc0f6fb20a443cf12bde9582ecbc2aef727)

3 files changed, 21 insertions, 10 deletions

diff --git a/src/providers/ipa/ipa_s2n_exop.c b/src/providers/ipa/ipa_s2n_exop.c
index d07923cff..3830a2b4b 100644
--- a/src/providers/ipa/ipa_s2n_exop.c
+++ b/src/providers/ipa/ipa_s2n_exop.c
@@ -50,9 +50,6 @@ enum response_types {
 };
 
 /* ==Sid2Name Extended Operation============================================= */
-#define EXOP_SID2NAME_OID "2.16.840.1.113730.3.8.10.4"
-#define EXOP_SID2NAME_V1_OID "2.16.840.1.113730.3.8.10.4.1"
-
 struct ipa_s2n_exop_state {
     struct sdap_handle *sh;
 
diff --git a/src/providers/ipa/ipa_subdomains.h b/src/providers/ipa/ipa_subdomains.h
index ceb862226..9b179792d 100644
--- a/src/providers/ipa/ipa_subdomains.h
+++ b/src/providers/ipa/ipa_subdomains.h
@@ -28,6 +28,10 @@
 #include "providers/dp_backend.h"
 #include "providers/ipa/ipa_common.h"
 
+/* ==Sid2Name Extended Operation============================================= */
+#define EXOP_SID2NAME_OID "2.16.840.1.113730.3.8.10.4"
+#define EXOP_SID2NAME_V1_OID "2.16.840.1.113730.3.8.10.4.1"
+
 struct be_ctx *ipa_get_subdomains_be_ctx(struct be_ctx *be_ctx);
 
 const char *get_flat_name_from_subdomain_name(struct be_ctx *be_ctx,
diff --git a/src/providers/ipa/ipa_subdomains_id.c b/src/providers/ipa/ipa_subdomains_id.c
index 15776d2e1..1253510dc 100644
--- a/src/providers/ipa/ipa_subdomains_id.c
+++ b/src/providers/ipa/ipa_subdomains_id.c
@@ -386,14 +386,8 @@ struct tevent_req *ipa_get_subdom_acct_send(TALLOC_CTX *memctx,
         case BE_REQ_GROUP:
         case BE_REQ_BY_SECID:
         case BE_REQ_USER_AND_GROUP:
-            ret = EOK;
-            break;
         case BE_REQ_INITGROUPS:
-            ret = ENOTSUP;
-            DEBUG(SSSDBG_TRACE_FUNC, "Initgroups requests are not handled " \
-                                      "by the IPA provider but are resolved " \
-                                      "by the responder directly from the " \
-                                      "cache.\n");
+            ret = EOK;
             break;
         default:
             ret = EINVAL;
@@ -434,6 +428,22 @@ static void ipa_get_subdom_acct_connected(struct tevent_req *subreq)
         return;
     }
 
+    if (state->entry_type == BE_REQ_INITGROUPS) {
+        /* With V1 of the extdom plugin a user lookup will resolve the full
+         * group membership of the user. */
+        if (sdap_is_extension_supported(sdap_id_op_handle(state->op),
+                                        EXOP_SID2NAME_V1_OID)) {
+            state->entry_type = BE_REQ_USER;
+        } else {
+            DEBUG(SSSDBG_TRACE_FUNC, "Initgroups requests are not handled " \
+                                      "by the IPA provider but are resolved " \
+                                      "by the responder directly from the " \
+                                      "cache.\n");
+            tevent_req_error(req, ENOTSUP);
+            return;
+        }
+    }
+
     req_input = talloc(state, struct req_input);
     if (req_input == NULL) {
         DEBUG(SSSDBG_OP_FAILURE, "talloc failed.\n");