* set domain->last_status = NT_STATUS_SERVER_DISABLED on an ads_connect() failure

* Fix code to use winbind_rpc methods for trusted mixed mode or NT4 domains
  ( does no one ever test this? )
* add in LDAP code to get the sequence number for rpc based seqnum update.
  ( this is needed if the DC is upgraded and samba is not reconfigured
    to use security = ads; it's not pretty but it works (from app_head) )
* fix bug that caused us to enumerate domain local groups in domains
  other than our own
(This used to be commit 14f2cd139a22454571cea8475d3b7c5c2787d378)

4 files changed, 269 insertions, 30 deletions

diff --git a/source3/nsswitch/winbindd_ads.c b/source3/nsswitch/winbindd_ads.c
index 04eb65637c..b54392a92e 100644
--- a/source3/nsswitch/winbindd_ads.c
+++ b/source3/nsswitch/winbindd_ads.c
@@ -116,7 +116,11 @@ static NTSTATUS query_user_list(struct winbindd_domain *domain,
 	DEBUG(3,("ads: query_user_list\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) goto done;
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		goto done;
+	}
 
 	rc = ads_search_retry(ads, &res, "(objectCategory=user)", attrs);
 	if (!ADS_ERR_OK(rc)) {
@@ -213,7 +217,11 @@ static NTSTATUS enum_dom_groups(struct winbindd_domain *domain,
 	DEBUG(3,("ads: enum_dom_groups\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) goto done;
+
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		goto done;
+	}
 
 	rc = ads_search_retry(ads, &res, "(objectCategory=group)", attrs);
 	if (!ADS_ERR_OK(rc)) {
@@ -236,7 +244,9 @@ static NTSTATUS enum_dom_groups(struct winbindd_domain *domain,
 	i = 0;
 	
 	group_flags = ATYPE_GLOBAL_GROUP;
-	if ( domain->native_mode )
+
+	/* only grab domain local groups for our domain */
+	if ( domain->native_mode && strequal(lp_realm(), domain->alt_name)  )
 		group_flags |= ATYPE_LOCAL_GROUP;
 
 	for (msg = ads_first_entry(ads, res); msg; msg = ads_next_entry(ads, msg)) {
@@ -286,7 +296,7 @@ static NTSTATUS enum_local_groups(struct winbindd_domain *domain,
 {
 	/*
 	 * This is a stub function only as we returned the domain 
-	 * ocal groups in enum_dom_groups() if the domain->native field
+	 * local groups in enum_dom_groups() if the domain->native field
 	 * was true.  This is a simple performance optimization when
 	 * using LDAP.
 	 *
@@ -311,8 +321,11 @@ static NTSTATUS name_to_sid(struct winbindd_domain *domain,
 	DEBUG(3,("ads: name_to_sid\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) 
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
 		return NT_STATUS_UNSUCCESSFUL;
+	}
 
 	return ads_name_to_sid(ads, name, sid, type);
 }
@@ -326,9 +339,13 @@ static NTSTATUS sid_to_name(struct winbindd_domain *domain,
 {
 	ADS_STRUCT *ads = NULL;
 	DEBUG(3,("ads: sid_to_name\n"));
+
 	ads = ads_cached_connection(domain);
-	if (!ads) 
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
 		return NT_STATUS_UNSUCCESSFUL;
+	}
 
 	return ads_sid_to_name(ads, mem_ctx, sid, name, type);
 }
@@ -408,7 +425,11 @@ static NTSTATUS query_user(struct winbindd_domain *domain,
 	DEBUG(3,("ads: query_user\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) goto done;
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		goto done;
+	}
 
 	sidstr = sid_binstring(sid);
 	asprintf(&exp, "(objectSid=%s)", sidstr);
@@ -474,7 +495,11 @@ static NTSTATUS lookup_usergroups_alt(struct winbindd_domain *domain,
 	DEBUG(3,("ads: lookup_usergroups_alt\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) goto done;
+
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		goto done;
+	}
 
 	/* buggy server, no tokenGroups.  Instead lookup what groups this user
 	   is a member of by DN search on member*/
@@ -562,7 +587,11 @@ static NTSTATUS lookup_usergroups(struct winbindd_domain *domain,
 	*num_groups = 0;
 
 	ads = ads_cached_connection(domain);
-	if (!ads) goto done;
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		goto done;
+	}
 
 	if (!(sidstr = sid_binstring(sid))) {
 		DEBUG(1,("lookup_usergroups(sid=%s) sid_binstring returned NULL\n", sid_to_string(sid_string, sid)));
@@ -669,7 +698,11 @@ static NTSTATUS lookup_groupmem(struct winbindd_domain *domain,
 	*num_names = 0;
 
 	ads = ads_cached_connection(domain);
-	if (!ads) goto done;
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		goto done;
+	}
 
 	sidstr = sid_binstring(group_sid);
 
@@ -745,7 +778,11 @@ static NTSTATUS sequence_number(struct winbindd_domain *domain, uint32 *seq)
 	*seq = DOM_SEQUENCE_NONE;
 
 	ads = ads_cached_connection(domain);
-	if (!ads) return NT_STATUS_UNSUCCESSFUL;
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		return NT_STATUS_UNSUCCESSFUL;
+	}
 
 	rc = ads_USN(ads, seq);
 	if (!ADS_ERR_OK(rc)) {
@@ -773,7 +810,11 @@ static NTSTATUS trusted_domains(struct winbindd_domain *domain,
 	*names = NULL;
 
 	ads = ads_cached_connection(domain);
-	if (!ads) return NT_STATUS_UNSUCCESSFUL;
+
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		return NT_STATUS_UNSUCCESSFUL;
+	}
 
 	rc = ads_trusted_domains(ads, mem_ctx, num_domains, names, alt_names, dom_sids);
 
@@ -789,7 +830,11 @@ static NTSTATUS domain_sid(struct winbindd_domain *domain, DOM_SID *sid)
 	DEBUG(3,("ads: domain_sid\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) return NT_STATUS_UNSUCCESSFUL;
+
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		return NT_STATUS_UNSUCCESSFUL;
+	}
 
 	rc = ads_domain_sid(ads, sid);
 
@@ -815,7 +860,11 @@ static NTSTATUS alternate_name(struct winbindd_domain *domain)
 	DEBUG(3,("ads: alternate_name\n"));
 
 	ads = ads_cached_connection(domain);
-	if (!ads) return NT_STATUS_UNSUCCESSFUL;
+	
+	if (!ads) {
+		domain->last_status = NT_STATUS_SERVER_DISABLED;
+		return NT_STATUS_UNSUCCESSFUL;
+	}
 
 	if (!(ctx = talloc_init("alternate_name"))) {
 		return NT_STATUS_NO_MEMORY;
diff --git a/source3/nsswitch/winbindd_cache.c b/source3/nsswitch/winbindd_cache.c
index 5464e765d1..9f7d3686a5 100644
--- a/source3/nsswitch/winbindd_cache.c
+++ b/source3/nsswitch/winbindd_cache.c
@@ -105,9 +105,19 @@ static struct winbind_cache *get_cache(struct winbindd_domain *domain)
 #ifdef HAVE_ADS
 		case SEC_ADS: {
 			extern struct winbindd_methods ads_methods;
-			domain->backend = &ads_methods;
-			break;
-		}
+			/* always obey the lp_security parameter for our domain */
+			if ( strequal(lp_realm(), domain->alt_name) ) {
+				domain->backend = &ads_methods;
+				break;
+			}
+
+			if ( domain->native_mode ) {
+				domain->backend = &ads_methods;
+				break;
+			}
+
+			/* fall through */
+		}	
 #endif
 		default:
 			domain->backend = &msrpc_methods;
@@ -990,10 +1000,6 @@ static NTSTATUS sid_to_name(struct winbindd_domain *domain,
 do_query:
 	*name = NULL;
 
-	if (wcache_server_down(domain)) {
-		return NT_STATUS_SERVER_DISABLED;
-	}
-
 	/* If the seq number check indicated that there is a problem
 	 * with this DC, then return that status... except for
 	 * access_denied.  This is special because the dc may be in
diff --git a/source3/nsswitch/winbindd_group.c b/source3/nsswitch/winbindd_group.c
index 41f594fe61..6749f55bff 100644
--- a/source3/nsswitch/winbindd_group.c
+++ b/source3/nsswitch/winbindd_group.c
@@ -75,7 +75,9 @@ static BOOL fill_grent_mem(struct winbindd_domain *domain,
 
 	*num_gr_mem = 0;
 	
-	if ((group_name_type!=SID_NAME_DOM_GRP) && (group_name_type!=SID_NAME_ALIAS)) {
+	if ( !((group_name_type==SID_NAME_DOM_GRP) ||
+		((group_name_type==SID_NAME_ALIAS) && strequal(lp_workgroup(), domain->name))) )
+	{
 		DEBUG(1, ("SID %s in domain %s isn't a domain group (%d)\n", 
 			  sid_to_string(sid_string, group_sid), domain->name, 
 			  group_name_type));
@@ -228,7 +230,9 @@ enum winbindd_result winbindd_getgrnam(struct winbindd_cli_state *state)
 		return WINBINDD_ERROR;
 	}
 
-	if ((name_type != SID_NAME_ALIAS) && (name_type != SID_NAME_DOM_GRP)) {
+	if ( !((name_type==SID_NAME_DOM_GRP) ||
+		((name_type==SID_NAME_ALIAS) && strequal(lp_workgroup(), domain->name))) )
+	{
 		DEBUG(1, ("name '%s' is not a local or domain group: %d\n", 
 			  name_group, name_type));
 		return WINBINDD_ERROR;
@@ -292,8 +296,9 @@ enum winbindd_result winbindd_getgrgid(struct winbindd_cli_state *state)
 		return WINBINDD_ERROR;
 	}
 
-	if (!((name_type == SID_NAME_ALIAS) || 
-	      (name_type == SID_NAME_DOM_GRP))) {
+	if ( !((name_type==SID_NAME_DOM_GRP) ||
+		((name_type==SID_NAME_ALIAS) && strequal(lp_workgroup(), domain->name))) )
+	{
 		DEBUG(1, ("name '%s' is not a local or domain group: %d\n", 
 			  group_name, name_type));
 		return WINBINDD_ERROR;
@@ -451,10 +456,10 @@ static BOOL get_sam_group_entries(struct getent_state *ent)
 	
 	ent->num_sam_entries = num_entries;
 	
-	/* get the domain local groups if we are a member of a native win2k domain */
+	/* get the domain local groups if we are a member of a native win2k domain
+	   and are not using LDAP to get the groups */
 	   
-	if ( domain->native_mode 
-		&& domain->methods->enum_local_groups 
+	if ( lp_security != SEC_ADS && domain->native_mode 
 		&& strequal(lp_workgroup(), domain->name) )
 	{
 		DEBUG(4,("get_sam_group_entries: Native Mode 2k domain; enumerating local groups as well\n"));
@@ -891,8 +896,9 @@ enum winbindd_result winbindd_getgroups(struct winbindd_cli_state *state)
 			/* Check it is a domain group or an alias (domain local group) 
 			   in a win2k native mode domain. */
 			
-			if ( !(sid_type == SID_NAME_DOM_GRP || sid_type == SID_NAME_ALIAS) ) {
-
+			if ( !((sid_type==SID_NAME_DOM_GRP) ||
+				((sid_type==SID_NAME_ALIAS) && strequal(lp_workgroup(), domain->name))) )
+			{
 				DEBUG(10, ("winbindd_getgroups: sid type %d "
 					   "for %s is not a domain group\n",
 					   sid_type,
diff --git a/source3/nsswitch/winbindd_rpc.c b/source3/nsswitch/winbindd_rpc.c
index 5710a323e8..7d6055006d 100644
--- a/source3/nsswitch/winbindd_rpc.c
+++ b/source3/nsswitch/winbindd_rpc.c
@@ -681,6 +681,168 @@ done:
         return result;
 }
 
+#ifdef HAVE_LDAP
+
+#include <ldap.h>
+
+static SIG_ATOMIC_T gotalarm;
+
+/***************************************************************
+ Signal function to tell us we timed out.
+****************************************************************/
+
+static void gotalarm_sig(void)
+{
+	gotalarm = 1;
+}
+
+static LDAP *ldap_open_with_timeout(const char *server, int port, unsigned int to)
+{
+	LDAP *ldp = NULL;
+
+	/* Setup timeout */
+	gotalarm = 0;
+	CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
+	alarm(to);
+	/* End setup timeout. */
+
+	ldp = ldap_open(server, port);
+
+	/* Teardown timeout. */
+	CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
+	alarm(0);
+
+	return ldp;
+}
+
+static int get_ldap_seq(const char *server, uint32 *seq)
+{
+	int ret = -1;
+	struct timeval to;
+	char *attrs[] = {"highestCommittedUSN", NULL};
+	LDAPMessage *res = NULL;
+	char **values = NULL;
+	LDAP *ldp = NULL;
+
+	*seq = DOM_SEQUENCE_NONE;
+
+	/*
+	 * 10 second timeout on open. This is needed as the search timeout
+	 * doesn't seem to apply to doing an open as well. JRA.
+	 */
+
+	if ((ldp = ldap_open_with_timeout(server, LDAP_PORT, 10)) == NULL)
+		return -1;
+
+#if 0
+	/* As per tridge comment this doesn't seem to be needed. JRA */
+	if ((err = ldap_simple_bind_s(ldp, NULL, NULL)) != 0)
+		goto done;
+#endif
+
+	/* Timeout if no response within 20 seconds. */
+	to.tv_sec = 10;
+	to.tv_usec = 0;
+
+	if (ldap_search_st(ldp, "", LDAP_SCOPE_BASE, "(objectclass=*)", &attrs[0], 0, &to, &res))
+		goto done;
+
+	if (ldap_count_entries(ldp, res) != 1)
+		goto done;
+
+	values = ldap_get_values(ldp, res, "highestCommittedUSN");
+	if (!values || !values[0])
+		goto done;
+
+	*seq = atoi(values[0]);
+	ret = 0;
+
+  done:
+
+	if (values)
+		ldap_value_free(values);
+	if (res)
+		ldap_msgfree(res);
+	if (ldp)
+		ldap_unbind(ldp);
+	return ret;
+}
+
+/**********************************************************************
+ Get the sequence number for a Windows AD native mode domain using
+ LDAP queries
+**********************************************************************/
+
+int get_ldap_sequence_number( const char* domain, uint32 *seq)
+{
+	int ret = -1;
+	int i;
+	struct in_addr *ip_list = NULL;
+	int count;
+	BOOL list_ordered;
+	
+	if ( !get_dc_list( domain, &ip_list, &count, &list_ordered ) ) {
+		DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
+		return False;
+	}
+
+	if ( !list_ordered )
+	{
+		/* 
+		 * Pick a nice close server. Look for DC on local net 
+		 * (assuming we don't have a list of preferred DC's)
+		 */
+
+		for (i = 0; i < count; i++) {
+			if (is_zero_ip(ip_list[i]))
+				continue;
+
+			if ( !is_local_net(ip_list[i]) )
+				continue;
+		
+			if ( (ret = get_ldap_seq( inet_ntoa(ip_list[i]), seq)) == 0 )
+				goto done;
+		
+			zero_ip(&ip_list[i]);
+		}
+	
+
+		/*
+		 * Secondly try and contact a random PDC/BDC.
+		 */
+
+		i = (sys_random() % count);
+
+		if ( !is_zero_ip(ip_list[i]) ) {
+			if ( (ret = get_ldap_seq( inet_ntoa(ip_list[i]), seq)) == 0 )
+				goto done;
+		}
+		zero_ip(&ip_list[i]); /* Tried and failed. */
+	}
+
+	/* Finally return first DC that we can contact */
+
+	for (i = 0; i < count; i++) {
+		if (is_zero_ip(ip_list[i]))
+			continue;
+
+		if ( (ret = get_ldap_seq( inet_ntoa(ip_list[i]), seq)) == 0 )
+			goto done;
+	}
+
+done:
+	if ( ret == 0 ) {
+		DEBUG(3, ("get_ldap_sequence_number: Retrieved sequence number for Domain (%s) from DC (%s)\n", 
+			domain, inet_ntoa(ip_list[i])));
+	}
+
+	SAFE_FREE(ip_list);
+
+	return ret;
+}
+
+#endif /* HAVE_LDAP */
+
 /* find the sequence number for a domain */
 static NTSTATUS sequence_number(struct winbindd_domain *domain, uint32 *seq)
 {
@@ -704,6 +866,22 @@ static NTSTATUS sequence_number(struct winbindd_domain *domain, uint32 *seq)
 
 	retry = 0;
 	do {
+#ifdef HAVE_LDAP
+		if ( domain->native_mode ) 
+		{
+			DEBUG(8,("using get_ldap_seq() to retrieve the sequence number\n"));
+
+			if ( get_ldap_sequence_number( domain->name, seq ) == 0 ) {			
+				result = NT_STATUS_OK;
+				DEBUG(10,("domain_sequence_number: LDAP for domain %s is %u\n",
+					domain->name, *seq));
+				goto done;
+			}
+
+			DEBUG(10,("domain_sequence_number: failed to get LDAP sequence number for domain %s\n",
+			domain->name ));
+		}
+#endif /* HAVE_LDAP */
 	        /* Get sam handle */
 		if (!NT_STATUS_IS_OK(result = cm_get_sam_handle(domain->name, &hnd)))
 			goto done;