s3-winbindd: Fix Bug #6711: trusts to windows 2008 (2008 r2) not working.

Winbindd should always try to use LSA via an schannel authenticated ncacn_ip_tcp
connection when talking to AD for LSA lookup calls.

In Samba <-> W2k8 interdomain trust scenarios, LookupSids3 and LookupNames4 via an
schannel ncacn_ip_tcp LSA connection are the *only* options to successfully resolve
sids and names.

Guenther
(cherry picked from commit 6a8ef6c424c52be861ed2a9806f917a64ec892a6)
(cherry picked from commit acc5e6012adca290ddc067a4ed25a8161b74250e)

3 files changed, 63 insertions, 5 deletions

diff --git a/source/winbindd/winbindd.h b/source/winbindd/winbindd.h
index f97eed07fc3..63b72692f7b 100644
--- a/source/winbindd/winbindd.h
+++ b/source/winbindd/winbindd.h
@@ -183,6 +183,8 @@ struct winbindd_domain {
 				  * to False. This variable is around so that
 				  * we don't have to try _ex every time. */
 
+	bool can_do_ncacn_ip_tcp;
+
 	/* Lookup methods for this domain (LDAP or RPC) */
 	struct winbindd_methods *methods;
 
diff --git a/source/winbindd/winbindd_cm.c b/source/winbindd/winbindd_cm.c
index 2f823cb6066..9ea3e75116a 100644
--- a/source/winbindd/winbindd_cm.c
+++ b/source/winbindd/winbindd_cm.c
@@ -1924,6 +1924,8 @@ done:
 	DEBUG(5,("set_dc_type_and_flags_connect: domain %s is %srunning active directory.\n",
 		  domain->name, domain->active_directory ? "" : "NOT "));
 
+	domain->can_do_ncacn_ip_tcp = domain->active_directory;
+
 	TALLOC_FREE(cli);
 
 	TALLOC_FREE(mem_ctx);
diff --git a/source/winbindd/winbindd_rpc.c b/source/winbindd/winbindd_rpc.c
index c1f1a6468df..db43559436f 100644
--- a/source/winbindd/winbindd_rpc.c
+++ b/source/winbindd/winbindd_rpc.c
@@ -1173,6 +1173,15 @@ static NTSTATUS msrpc_password_policy(struct winbindd_domain *domain,
 	return result;
 }
 
+typedef NTSTATUS (*lookup_sids_fn_t)(struct rpc_pipe_client *cli,
+				     TALLOC_CTX *mem_ctx,
+				     struct policy_handle *pol,
+				     int num_sids,
+				     const DOM_SID *sids,
+				     char ***pdomains,
+				     char ***pnames,
+				     enum lsa_SidType **ptypes);
+
 NTSTATUS winbindd_lookup_sids(TALLOC_CTX *mem_ctx,
 			      struct winbindd_domain *domain,
 			      uint32_t num_sids,
@@ -1185,12 +1194,23 @@ NTSTATUS winbindd_lookup_sids(TALLOC_CTX *mem_ctx,
 	struct rpc_pipe_client *cli = NULL;
 	struct policy_handle lsa_policy;
 	unsigned int orig_timeout;
+	lookup_sids_fn_t lookup_sids_fn = rpccli_lsa_lookup_sids;
 
+	if (domain->can_do_ncacn_ip_tcp) {
+		status = cm_connect_lsa_tcp(domain, mem_ctx, &cli);
+		if (NT_STATUS_IS_OK(status)) {
+			lookup_sids_fn = rpccli_lsa_lookup_sids3;
+			goto lookup;
+		}
+		domain->can_do_ncacn_ip_tcp = false;
+	}
 	status = cm_connect_lsa(domain, mem_ctx, &cli, &lsa_policy);
+
 	if (!NT_STATUS_IS_OK(status)) {
 		return status;
 	}
 
+ lookup:
 	/*
 	 * This call can take a long time
 	 * allow the server to time out.
@@ -1198,9 +1218,14 @@ NTSTATUS winbindd_lookup_sids(TALLOC_CTX *mem_ctx,
 	 */
 	orig_timeout = rpccli_set_timeout(cli, 35000);
 
-	status = rpccli_lsa_lookup_sids(cli, mem_ctx, &lsa_policy,
-					num_sids, sids, domains,
-					names, types);
+	status = lookup_sids_fn(cli,
+				mem_ctx,
+				&lsa_policy,
+				num_sids,
+				sids,
+				domains,
+				names,
+				types);
 
 	/* And restore our original timeout. */
 	rpccli_set_timeout(cli, orig_timeout);
@@ -1212,6 +1237,16 @@ NTSTATUS winbindd_lookup_sids(TALLOC_CTX *mem_ctx,
 	return status;
 }
 
+typedef NTSTATUS (*lookup_names_fn_t)(struct rpc_pipe_client *cli,
+				      TALLOC_CTX *mem_ctx,
+				      struct policy_handle *pol,
+				      int num_names,
+				      const char **names,
+				      const char ***dom_names,
+				      int level,
+				      struct dom_sid **sids,
+				      enum lsa_SidType **types);
+
 NTSTATUS winbindd_lookup_names(TALLOC_CTX *mem_ctx,
 			       struct winbindd_domain *domain,
 			       uint32_t num_names,
@@ -1224,12 +1259,24 @@ NTSTATUS winbindd_lookup_names(TALLOC_CTX *mem_ctx,
 	struct rpc_pipe_client *cli = NULL;
 	struct policy_handle lsa_policy;
 	unsigned int orig_timeout;
+	lookup_names_fn_t lookup_names_fn = rpccli_lsa_lookup_names;
 
+	if (domain->can_do_ncacn_ip_tcp) {
+		status = cm_connect_lsa_tcp(domain, mem_ctx, &cli);
+		if (NT_STATUS_IS_OK(status)) {
+			lookup_names_fn = rpccli_lsa_lookup_names4;
+			goto lookup;
+		}
+		domain->can_do_ncacn_ip_tcp = false;
+	}
 	status = cm_connect_lsa(domain, mem_ctx, &cli, &lsa_policy);
+
 	if (!NT_STATUS_IS_OK(status)) {
 		return status;
 	}
 
+ lookup:
+
 	/*
 	 * This call can take a long time
 	 * allow the server to time out.
@@ -1237,8 +1284,15 @@ NTSTATUS winbindd_lookup_names(TALLOC_CTX *mem_ctx,
 	 */
 	orig_timeout = rpccli_set_timeout(cli, 35000);
 
-	status = rpccli_lsa_lookup_names(cli, mem_ctx, &lsa_policy, num_names,
-					 names, domains, 1, sids, types);
+	status = lookup_names_fn(cli,
+				 mem_ctx,
+				 &lsa_policy,
+				 num_names,
+				 (const char **) names,
+				 domains,
+				 1,
+				 sids,
+				 types);
 
 	/* And restore our original timeout. */
 	rpccli_set_timeout(cli, orig_timeout);