merge of the netsamlogon caching code from APPLIANCE_HEAD

This replaces the universal group caching code (was originally
based on that code).  Only applies to the the RPC code.

One comment: domain local groups don't show up in 'getent group'
that's easy to fix.

Code has been tested against 2k domain but doesn't change anything
with respect to NT4 domains.

netsamlogon caching works pretty much like the universal group
caching code did but has had much more testing and puts winbind
mostly back in sync between branches.
(This used to be commit aac01dc7bc95c20ee21c93f3581e2375d9a894e1)

1 files changed, 46 insertions, 23 deletions

diff --git a/source3/lib/username.c b/source3/lib/username.c
index d8f4ff80ed..8130b93c3f 100644
--- a/source3/lib/username.c
+++ b/source3/lib/username.c
@@ -325,11 +325,12 @@ static BOOL user_in_netgroup_list(const char *user, const char *ngname)
   
 static BOOL user_in_winbind_group_list(const char *user, const char *gname, BOOL *winbind_answered)
 {
-	int num_groups;
 	int i;
- 	gid_t *groups = NULL;
  	gid_t gid, gid_low, gid_high;
  	BOOL ret = False;
+	static gid_t *groups = NULL;
+	static int num_groups = 0;
+	static fstring last_user = "";
  
  	*winbind_answered = False;
  
@@ -349,27 +350,44 @@ static BOOL user_in_winbind_group_list(const char *user, const char *gname, BOOL
  		goto err;
 	}
  
- 	/*
- 	 * Get the gid's that this user belongs to.
- 	 */
- 
- 	if ((num_groups = winbind_getgroups(user, 0, NULL)) == -1)
- 		return False;
+	/* try to user the last user we looked up */
+	/* otherwise fall back to lookups */
+	
+	if ( !strequal( last_user, user ) || !groups )
+ 	{
+		/* clear any cached information */
+		
+ 	 	SAFE_FREE(groups);
+		fstrcpy( last_user, "" );
+
+	 	/*
+ 		 * Get the gid's that this user belongs to.
+ 		 */
  
- 	if (num_groups == 0) {
- 		*winbind_answered = True;
- 		return False;
- 	}
+	 	if ((num_groups = winbind_getgroups(user, &groups)) == -1)
+ 			return False;
+			
+		if ( num_groups == -1 )
+			return False;
  
- 	if ((groups = (gid_t *)malloc(sizeof(gid_t) * num_groups )) == NULL) {
- 		DEBUG(0,("user_in_winbind_group_list: malloc fail.\n"));
- 		goto err;
- 	}
+	 	if ( num_groups == 0 ) {
+ 			*winbind_answered = True;
+ 			return False;
+ 		}
+ 		
+		/* save the last username */
+		
+		fstrcpy( last_user, user );
+		
+	}
+	else 
+		DEBUG(10,("user_in_winbind_group_list: using cached user groups for [%s]\n", user));
  
- 	if ((num_groups = winbind_getgroups(user, num_groups, groups)) == -1) {
- 		DEBUG(0,("user_in_winbind_group_list: second winbind_getgroups call \
-failed with error %s\n", strerror(errno) ));
- 		goto err;
+ 	if ( DEBUGLEVEL >= 10 ) {
+		DEBUG(10,("user_in_winbind_group_list: using groups -- "));
+	 	for ( i=0; i<num_groups; i++ )
+			DEBUGADD(10,("%d ", groups[i]));
+		DEBUGADD(10,("\n"));	
 	}
  
 	/*
@@ -571,10 +589,15 @@ BOOL user_in_list(const char *user,const char **list, gid_t *groups, size_t n_gr
 				fstrcpy(domain, *list);
 				domain[PTR_DIFF(p, *list)] = 0;
 
-				/* Check to see if name is a Windows group */
-				if (winbind_lookup_name(domain, groupname, &g_sid, &name_type) && name_type == SID_NAME_DOM_GRP) {
+			/* Check to see if name is a Windows group;  Win2k native mode DCs
+			   will return domain local groups; while NT4 or mixed mode 2k DCs
+			   will not */
+			
+			if ( winbind_lookup_name(NULL, *list, &g_sid, &name_type) 
+				&& ( name_type==SID_NAME_DOM_GRP || name_type==SID_NAME_ALIAS ) )
+			{
 					
-				/* Check if user name is in the Windows group */
+					/* Check if user name is in the Windows group */
 					ret = user_in_winbind_group_list(user, *list, &winbind_answered);
 					
 					if (winbind_answered && ret == True) {