Remove 'unixsam' from the default passdb backends.

The intention is to remove the muliple passdb backends, but we need the
'guest' account to always be there.  If the admin adds the guest account to
(say) LDAP, there will only be one backend required for operation.

This helps remove some nasty behaviours with adding accounts to the system
for both the RPC 'create user' and the SAMSYNC code.  Users 'added' with
an 'add user/machine' script won't magicly appear, and machine accounts
'pre-added' to unix, but not the smbpasswd file will not cause mayhem.

This commit also implements somthing tridge discussed with me, the concept
of 'default' passdb operation pointers - so that each backend does not
need it's own stub funcitons wrapping the default tdb privilages/group
mapping code.

This also removes an implicit 'sid->name' and 'name->sid' mapping from our
own local SID space, to winbind usernames.  When adding mapping for NIS/LDAP
non-sam users in future, we need to be careful.

Andrew Bartlett
(This used to be commit 6f32fa234961a525760a05418a08ec48d22d7617)

1 files changed, 123 insertions, 0 deletions

diff --git a/source3/passdb/pdb_guest.c b/source3/passdb/pdb_guest.c
new file mode 100644
index 0000000000..3f0f06d18d
--- /dev/null
+++ b/source3/passdb/pdb_guest.c
@@ -0,0 +1,123 @@
+/*
+ * 'Guest' password backend for samba
+ * Copyright (C) Jelmer Vernooij 2002
+ * Copyright (C) Andrew Bartlett 2003
+ * 
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ * 
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 675
+ * Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "includes.h"
+
+/******************************************************************
+  Lookup a name in the SAM database
+ ******************************************************************/
+
+static NTSTATUS guestsam_getsampwnam (struct pdb_methods *methods, SAM_ACCOUNT *user, const char *sname)
+{
+	NTSTATUS nt_status;
+	struct passwd *pass;
+	const char *guest_account = lp_guestaccount();
+	if (!(guest_account && *guest_account)) {
+		DEBUG(1, ("NULL guest account!?!?\n"));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	if (!methods) {
+		DEBUG(0,("invalid methods\n"));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	if (!sname) {
+		DEBUG(0,("invalid name specified"));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	if (!strequal(guest_account, sname)) {
+		return NT_STATUS_NO_SUCH_USER;
+	}
+		
+	pass = getpwnam_alloc(guest_account);
+
+	nt_status = pdb_fill_sam_pw(user, pass);
+
+	passwd_free(&pass);
+	return nt_status;
+}
+
+
+/***************************************************************************
+  Search by rid
+ **************************************************************************/
+
+static NTSTATUS guestsam_getsampwrid (struct pdb_methods *methods, 
+				 SAM_ACCOUNT *user, uint32 rid)
+{
+	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
+	struct passwd *pass = NULL;
+	const char *guest_account = lp_guestaccount();
+	if (!(guest_account && *guest_account)) {
+		DEBUG(1, ("NULL guest account!?!?\n"));
+		return nt_status;
+	}
+
+	if (!methods) {
+		DEBUG(0,("invalid methods\n"));
+		return nt_status;
+	}
+	
+	if (rid == DOMAIN_USER_RID_GUEST) {
+		pass = getpwnam_alloc(guest_account);
+		if (!pass) {
+			DEBUG(1, ("guest account %s does not seem to exist...\n", guest_account));
+			return NT_STATUS_NO_SUCH_USER;
+		}
+	} else {
+		return NT_STATUS_NO_SUCH_USER;
+	}
+
+	nt_status = pdb_fill_sam_pw(user, pass);
+	passwd_free(&pass);
+
+	return nt_status;
+}
+
+static NTSTATUS guestsam_getsampwsid(struct pdb_methods *my_methods, SAM_ACCOUNT * user, const DOM_SID *sid)
+{
+	uint32 rid;
+	if (!sid_peek_check_rid(get_global_sam_sid(), sid, &rid))
+		return NT_STATUS_NO_SUCH_USER;
+	return guestsam_getsampwrid(my_methods, user, rid);
+}
+
+NTSTATUS pdb_init_guestsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+{
+	NTSTATUS nt_status;
+	
+	if (!pdb_context) {
+		DEBUG(0, ("invalid pdb_context specified\n"));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	if (!NT_STATUS_IS_OK(nt_status = make_pdb_methods(pdb_context->mem_ctx, pdb_method))) {
+		return nt_status;
+	}
+	
+	(*pdb_method)->name = "guestsam";
+	
+	(*pdb_method)->getsampwnam = guestsam_getsampwnam;
+	(*pdb_method)->getsampwsid = guestsam_getsampwsid;
+	
+	/* There's not very much to initialise here */
+	return NT_STATUS_OK;
+}