delineation between smb and msrpc more marked. smbd now constructs

pdus, and then feeds them over either a "local" function call or a "remote"
function call to an msrpc service.  the "remote" msrpc daemon, on the
other side of a unix socket, then calls the same "local" function that
smbd would, if the msrpc service were being run from inside smbd.

this allows a transition from local msrpc services (inside the same smbd
process) to remote (over a unix socket).

removed reference to pipes_struct in msrpc services.  all msrpc processing
functions take rpcsrv_struct which is a structure containing state info
for the msrpc functions to decode and create pdus.

created become_vuser() which does everything not related to connection_struct
that become_user() does.

removed, as best i could, connection_struct dependencies from the nt spoolss
printing code.

todo: remove dcinfo from rpcsrv_struct because this stores NETLOGON-specific
info on a per-connection basis, and if the connection dies then so does
the info, and that's a fairly serious problem.

had to put pretty much everything that is in user_struct into parse_creds.c
to feed unix user info over to the msrpc daemons.  why?  because it's
expensive to do unix password/group database lookups, and it's definitely
expensive to do nt user profile lookups, not to mention pretty difficult
and if you did either of these it would introduce a complication /
unnecessary interdependency.  so, send uid/gid/num_groups/gid_t* +
SID+num_rids+domain_group_rids* + unix username + nt username + nt domain
+ user session key etc.  this is the MINIMUM info identified so far that's
actually implemented.  missing bits include the called and calling
netbios names etc.  (basically, anything that can be loaded into
standard_sub() and standard_sub_basic()...)
(This used to be commit aa3c659a8dba0437c17c60055a6ed30fdfecdb6d)

1 files changed, 115 insertions, 9 deletions

diff --git a/source3/smbd/uid.c b/source3/smbd/uid.c
index 92565b7507..3501879d5f 100644
--- a/source3/smbd/uid.c
+++ b/source3/smbd/uid.c
@@ -25,6 +25,7 @@ extern int DEBUGLEVEL;
 
 static uid_t initial_uid;
 static gid_t initial_gid;
+static struct uid_cache vcache;
 
 /* what user is current? */
 extern struct current_user current_user;
@@ -54,6 +55,8 @@ void init_uid(void)
 	current_user.conn = NULL;
 	current_user.vuid = UID_FIELD_INVALID;
 	
+	vcache.entries = 0;
+
 	dos_ChDir(OriginalDir);
 }
 
@@ -192,19 +195,19 @@ BOOL become_guest(void)
 /*******************************************************************
 check if a username is OK
 ********************************************************************/
-static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
+static BOOL check_vuser_ok(struct uid_cache *cache, user_struct *vuser,int snum)
 {
   int i;
-  for (i=0;i<conn->uid_cache.entries;i++)
-    if (conn->uid_cache.list[i] == vuser->uid) return(True);
+  for (i=0;i<cache->entries;i++)
+    if (cache->list[i] == vuser->uid) return(True);
 
   if (!user_ok(vuser->name,snum)) return(False);
 
-  i = conn->uid_cache.entries % UID_CACHE_SIZE;
-  conn->uid_cache.list[i] = vuser->uid;
+  i = cache->entries % UID_CACHE_SIZE;
+  cache->list[i] = vuser->uid;
 
-  if (conn->uid_cache.entries < UID_CACHE_SIZE)
-    conn->uid_cache.entries++;
+  if (cache->entries < UID_CACHE_SIZE)
+    cache->entries++;
 
   return(True);
 }
@@ -213,11 +216,114 @@ static BOOL check_user_ok(connection_struct *conn, user_struct *vuser,int snum)
 /****************************************************************************
   become the user of a connection number
 ****************************************************************************/
+BOOL become_vuser(uint16 vuid)
+{
+	user_struct *vuser = get_valid_user_struct(vuid);
+	gid_t gid;
+	uid_t uid;
+
+	unbecome_vuser();
+
+	if((vuser != NULL) && !check_vuser_ok(&vcache, vuser, -1))
+		return False;
+
+	if ( vuser != 0 &&
+	     current_user.vuid == vuid && 
+	     current_user.uid  == vuser->uid)
+	{
+		DEBUG(4,("Skipping become_vuser - already user\n"));
+		return(True);
+	}
+	uid = vuser->uid;
+	gid = vuser->gid;
+	current_user.ngroups = vuser->n_groups;
+	current_user.groups  = vuser->groups;
+	
+	if (initial_uid == 0)
+	{
+		if (!become_gid(gid)) return(False);
+
+#ifdef HAVE_SETGROUPS      
+		/* groups stuff added by ih/wreu */
+		if (current_user.ngroups > 0)
+		{
+			if (setgroups(current_user.ngroups,
+				      current_user.groups)<0) {
+				DEBUG(0,("setgroups call failed!\n"));
+			}
+		}
+#endif
+
+		if (!become_uid(uid)) return(False);
+	}
+	
+	current_user.conn = NULL;
+	current_user.vuid = vuid;
+
+	DEBUG(5,("become_vuser uid=(%d,%d) gid=(%d,%d)\n",
+		 (int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
+  
+	return(True);
+}
+
+/****************************************************************************
+  unbecome a user 
+****************************************************************************/
+BOOL unbecome_vuser(void)
+{
+  dos_ChDir(OriginalDir);
+
+  if (initial_uid == 0)
+    {
+#ifdef HAVE_SETRESUID
+      setresuid(-1,getuid(),-1);
+      setresgid(-1,getgid(),-1);
+#else
+      if (seteuid(initial_uid) != 0) 
+	setuid(initial_uid);
+      setgid(initial_gid);
+#endif
+    }
+
+#ifdef NO_EID
+  if (initial_uid == 0)
+    DEBUG(2,("Running with no EID\n"));
+  initial_uid = getuid();
+  initial_gid = getgid();
+#else
+  if (geteuid() != initial_uid) {
+	  DEBUG(0,("Warning: You appear to have a trapdoor uid system\n"));
+	  initial_uid = geteuid();
+  }
+  if (getegid() != initial_gid) {
+	  DEBUG(0,("Warning: You appear to have a trapdoor gid system\n"));
+	  initial_gid = getegid();
+  }
+#endif
+
+  current_user.uid = initial_uid;
+  current_user.gid = initial_gid;
+  
+  if (dos_ChDir(OriginalDir) != 0)
+    DEBUG( 0, ( "chdir(%s) failed in unbecome_vuser\n", OriginalDir ) );
+
+  DEBUG(5,("unbecome_vuser now uid=(%d,%d) gid=(%d,%d)\n",
+	(int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
+
+  current_user.conn = NULL;
+  current_user.vuid = UID_FIELD_INVALID;
+
+  return(True);
+}
+
+/****************************************************************************
+  become the user of a connection number
+****************************************************************************/
 BOOL become_user(connection_struct *conn, uint16 vuid)
 {
 	user_struct *vuser = get_valid_user_struct(vuid);
 	int snum;
-    gid_t gid;
+	gid_t gid;
 	uid_t uid;
 
 	/*
@@ -247,7 +353,7 @@ BOOL become_user(connection_struct *conn, uint16 vuid)
 
 	snum = SNUM(conn);
 
-	if((vuser != NULL) && !check_user_ok(conn, vuser, snum))
+	if((vuser != NULL) && !check_vuser_ok(&conn->uid_cache, vuser, snum))
 		return False;
 
 	if (conn->force_user ||