- port AUTH and PASSDB subsystems to new

  SMB_SUBSYSTEM() scheme

- some const fixes in ntvfs

metze
(This used to be commit af89a78123068767b1d134969c5651a0fd978b0d)

21 files changed, 569 insertions, 268 deletions

diff --git a/source4/Makefile.in b/source4/Makefile.in
index 125c9e96ace..cce4a4aefb2 100644
--- a/source4/Makefile.in
+++ b/source4/Makefile.in
@@ -182,26 +182,17 @@ LIBSMB_OBJ = libcli/clireadwrite.o libcli/cliconnect.o \
 	     libcli/clideltree.o \
 	     $(LIBRAW_OBJ)
 
-PASSDB_GET_SET_OBJ = passdb/pdb_get_set.o
-
-PASSDB_OBJ = $(PASSDB_GET_SET_OBJ) passdb/passdb.o passdb/pdb_interface.o \
-		passdb/machine_sid.o passdb/pdb_smbpasswd.o \
-		passdb/pdb_tdb.o passdb/pdb_ldap.o \
-		passdb/pdb_unix.o passdb/pdb_guest.o passdb/util_sam_sid.o \
-		passdb/pdb_compat.o passdb/pdb_nisplus.o
-
-PLAINTEXT_AUTH_OBJ = auth/pampass.o auth/pass_check.o
-
-AUTH_OBJ = auth/auth.o auth/auth_sam.o \
-	   auth/auth_unix.o auth/auth_util.o	\
-	   auth/auth_builtin.o auth/auth_compat.o auth/auth_ntlmssp.o \
-	   $(PLAINTEXT_AUTH_OBJ)
-
 SMBD_OBJ_MAIN = smbd/server.o
 
 SMB_OBJS = @SMB_OBJS@
 SMB_LIBS = @SMB_LIBS@
 
+AUTH_OBJS = @AUTH_OBJS@
+AUTH_LIBS = @AUTH_LIBS@
+
+PASSDB_OBJS = @PASSDB_OBJS@
+PASSDB_LIBS = @PASSDB_LIBS@
+
 NTVFS_OBJS = @NTVFS_OBJS@
 NTVFS_LIBS = @NTVFS_LIBS@
 
@@ -212,7 +203,7 @@ SMBD_OBJ_SRV =	smbd/process.o \
 		lib/server_mutex.o \
 		smbd/build_options.o \
 		smbd/rewrite.o \
-		$(DCERPC_OBJS) $(SMB_OBJS) $(NTVFS_OBJS) @SMBD_EXTRA_OBJS@
+		$(DCERPC_OBJS) $(SMB_OBJS) $(AUTH_OBJS) $(PASSDB_OBJS) $(NTVFS_OBJS) @SMBD_EXTRA_OBJS@
 
 PROCESS_MODEL_OBJS = @PROCESS_MODEL_OBJS@
 PROCESS_MODEL_LIBS = @PROCESS_MODEL_LIBS@
@@ -222,7 +213,7 @@ SMBD_OBJ_BASE = $(PROCESS_MODEL_OBJS) $(SMBD_OBJ_SRV) \
 		$(AUTH_OBJ) $(LIB_OBJ) $(POPT_LIB_OBJ) $(LIBSMB_OBJ)
 
 SMBD_OBJS = $(SMBD_OBJ_MAIN) $(SMBD_OBJ_BASE) @BUILD_POPT@
-SMBD_LIBS = $(LIBS) $(PROCESS_MODEL_LIBS) $(DCERPC_LIBS) $(NTVFS_LIBS)
+SMBD_LIBS = $(LIBS) $(PROCESS_MODEL_LIBS) $(DCERPC_LIBS) $(AUTH_LIBS) $(PASSDB_LIBS) $(NTVFS_LIBS)
 
 CLIENT_OBJ1 = client/client.o client/clitar.o libcli/raw/clirewrite.o
 
diff --git a/source4/auth/auth.c b/source4/auth/auth.c
index 2dc14248f96..a41cf72b1fb 100644
--- a/source4/auth/auth.c
+++ b/source4/auth/auth.c
@@ -23,28 +23,6 @@
 #undef DBGC_CLASS
 #define DBGC_CLASS DBGC_AUTH
 
-/** List of various built-in authentication modules */
-
-static const struct auth_init_function_entry builtin_auth_init_functions[] = {
-	{ "guest", auth_init_guest },
-/*	{ "rhosts", auth_init_rhosts }, */
-/*	{ "hostsequiv", auth_init_hostsequiv }, */
-	{ "sam", auth_init_sam },	
-	{ "samstrict", auth_init_samstrict },
-	{ "samstrict_dc", auth_init_samstrict_dc },
-	{ "unix", auth_init_unix },
-/*	{ "smbserver", auth_init_smbserver }, */
-/*	{ "ntdomain", auth_init_ntdomain }, */
-/*	{ "trustdomain", auth_init_trustdomain }, */
-/*	{ "winbind", auth_init_winbind }, */
-#ifdef DEVELOPER
-	{ "name_to_ntstatus", auth_init_name_to_ntstatus },
-	{ "fixed_challenge", auth_init_fixed_challenge },
-#endif
-	{ "plugin", auth_init_plugin },
-	{ NULL, NULL}
-};
-
 /****************************************************************************
  Try to get a challenge out of the various authentication modules.
  Returns a const char of length 8 bytes.
@@ -335,37 +313,40 @@ static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context,
 	if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
 		return nt_status;
 	
-	for (;*text_list; text_list++) { 
+	for (;*text_list; text_list++) {
+		char *module_name = smb_xstrdup(*text_list);
+		char *module_params = NULL;
+		char *p;
+		const struct auth_operations *ops;
+
 		DEBUG(5,("make_auth_context_text_list: Attempting to find an auth method to match %s\n",
 					*text_list));
-		for (i = 0; builtin_auth_init_functions[i].name; i++) {
-			char *module_name = smb_xstrdup(*text_list);
-			char *module_params = NULL;
-			char *p;
-
-			p = strchr(module_name, ':');
-			if (p) {
-				*p = 0;
-				module_params = p+1;
-				trim_string(module_params, " ", " ");
-			}
 
-			trim_string(module_name, " ", " ");
-
-			if (strequal(builtin_auth_init_functions[i].name, module_name)) {
-				DEBUG(5,("make_auth_context_text_list: Found auth method %s (at pos %d)\n", *text_list, i));
-				if (NT_STATUS_IS_OK(builtin_auth_init_functions[i].init(*auth_context, module_params, &t))) {
-					DEBUG(5,("make_auth_context_text_list: auth method %s has a valid init\n",
-								*text_list));
-					DLIST_ADD_END(list, t, auth_methods *);
-				} else {
-					DEBUG(0,("make_auth_context_text_list: auth method %s did not correctly init\n",
-								*text_list));
-				}
-				break;
-			}
+		p = strchr(module_name, ':');
+		if (p) {
+			*p = 0;
+			module_params = p+1;
+			trim_string(module_params, " ", " ");
+		}
+
+		trim_string(module_name, " ", " ");
+
+		ops = auth_backend_byname(module_name);
+		if (!ops) {
+			DEBUG(5,("make_auth_context_text_list: Found auth method %s (at pos %d)\n", *text_list, i));
 			SAFE_FREE(module_name);
+			break;
+		}
+
+		if (NT_STATUS_IS_OK(ops->init(*auth_context, module_params, &t))) {
+			DEBUG(5,("make_auth_context_text_list: auth method %s has a valid init\n",
+						*text_list));
+			DLIST_ADD_END(list, t, auth_methods *);
+		} else {
+			DEBUG(0,("make_auth_context_text_list: auth method %s did not correctly init\n",
+						*text_list));
 		}
+		SAFE_FREE(module_name);
 	}
 	
 	(*auth_context)->auth_method_list = list;
@@ -452,4 +433,101 @@ NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[
 	return nt_status;
 }
 
+/* the list of currently registered AUTH backends */
+static struct {
+	const struct auth_operations *ops;
+} *backends = NULL;
+static int num_backends;
+
+/*
+  register a AUTH backend. 
+
+  The 'name' can be later used by other backends to find the operations
+  structure for this backend.
+*/
+static NTSTATUS auth_register(void *_ops)
+{
+	const struct auth_operations *ops = _ops;
+	struct auth_operations *new_ops;
+	
+	if (auth_backend_byname(ops->name) != NULL) {
+		/* its already registered! */
+		DEBUG(0,("AUTH backend '%s' already registered\n", 
+			 ops->name));
+		return NT_STATUS_OBJECT_NAME_COLLISION;
+	}
+
+	backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
+	if (!backends) {
+		smb_panic("out of memory in auth_register");
+	}
+
+	new_ops = smb_xmemdup(ops, sizeof(*ops));
+	new_ops->name = smb_xstrdup(ops->name);
+
+	backends[num_backends].ops = new_ops;
+
+	num_backends++;
+
+	DEBUG(3,("AUTH backend '%s' registered\n", 
+		 ops->name));
+
+	return NT_STATUS_OK;
+}
+
+/*
+  return the operations structure for a named backend of the specified type
+*/
+const struct auth_operations *auth_backend_byname(const char *name)
+{
+	int i;
+
+	for (i=0;i<num_backends;i++) {
+		if (strcmp(backends[i].ops->name, name) == 0) {
+			return backends[i].ops;
+		}
+	}
+
+	return NULL;
+}
+
+/*
+  return the AUTH interface version, and the size of some critical types
+  This can be used by backends to either detect compilation errors, or provide
+  multiple implementations for different smbd compilation options in one module
+*/
+const struct auth_critical_sizes *auth_interface_version(void)
+{
+	static const struct auth_critical_sizes critical_sizes = {
+		AUTH_INTERFACE_VERSION,
+		sizeof(struct auth_operations),
+		sizeof(struct auth_methods),
+		sizeof(struct auth_context),
+		sizeof(struct auth_ntlmssp_state),
+		sizeof(struct auth_usersupplied_info),
+		sizeof(struct auth_serversupplied_info),
+		sizeof(struct auth_str),
+		sizeof(struct auth_unistr)
+	};
+
+	return &critical_sizes;
+}
+
+/*
+  initialise the AUTH subsystem
+*/
+BOOL auth_init(void)
+{
+	NTSTATUS status;
+
+	status = register_subsystem("auth", auth_register); 
+	if (!NT_STATUS_IS_OK(status)) {
+		return False;
+	}
+
+	/* FIXME: Perhaps panic if a basic backend, such as SAM, fails to initialise? */
+	static_init_auth;
 
+	DEBUG(3,("AUTH subsystem version %d initialised\n", AUTH_INTERFACE_VERSION));
+	return True;
+}
diff --git a/source4/include/auth.h b/source4/auth/auth.h
index 84faba2b0d4..dc12d8196f1 100644
--- a/source4/include/auth.h
+++ b/source4/auth/auth.h
@@ -1,5 +1,3 @@
-#ifndef _SMBAUTH_H_
-#define _SMBAUTH_H_
 /* 
    Unix SMB/CIFS implementation.
    Standardised Authentication types
@@ -20,15 +18,26 @@
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#ifndef _SAMBA_AUTH_H
+#define _SAMBA_AUTH_H
+
+/* modules can use the following to determine if the interface has changed
+ * please increment the version number after each interface change
+ * with a comment and maybe update struct auth_critical_sizes.
+ */
+/* version 1 - version from samba 3.0 - metze */
+/* version 2 - initial samba4 version - metze */
+#define AUTH_INTERFACE_VERSION 2
+
 /* AUTH_STR - string */
-typedef struct normal_string
+typedef struct auth_str
 {
 	int len;
 	char *str;
 } AUTH_STR;
 
 /* AUTH_UNISTR - unicode string or buffer */
-typedef struct unicode_string
+typedef struct auth_unistr
 {
 	int len;
 	uchar *unistr;
@@ -42,7 +51,6 @@ typedef struct unicode_string
 
 typedef struct auth_usersupplied_info
 {
-	
  	DATA_BLOB lm_resp;
 	DATA_BLOB nt_resp;
  	DATA_BLOB plaintext_password;
@@ -56,7 +64,6 @@ typedef struct auth_usersupplied_info
 	AUTH_STR           internal_username;    /* username after mapping */
 	AUTH_STR           smb_name;        /* username before mapping */
 	AUTH_STR           wksta_name;           /* workstation name (netbios calling name) unicode string */
-	
 } auth_usersupplied_info;
 
 #define SAM_FILL_NAME  0x01
@@ -87,7 +94,6 @@ typedef struct auth_serversupplied_info
 	SAM_ACCOUNT *sam_account;
 	
 	void *pam_handle;
-	
 } auth_serversupplied_info;
 
 struct auth_context {
@@ -120,7 +126,7 @@ typedef struct auth_methods
 			 void *my_private_data, 
 			 TALLOC_CTX *mem_ctx,
 			 const struct auth_usersupplied_info *user_info, 
-			 auth_serversupplied_info **server_info);
+			 struct auth_serversupplied_info **server_info);
 
 	DATA_BLOB (*get_chal)(const struct auth_context *auth_context,
 			      void **my_private_data, 
@@ -134,18 +140,8 @@ typedef struct auth_methods
 
 	/* Function to send a keepalive message on the above structure */
 	void (*send_keepalive)(void **private_data);
-
 } auth_methods;
 
-typedef NTSTATUS (*auth_init_function)(struct auth_context *, const char *, struct auth_methods **);
-
-struct auth_init_function_entry {
-	const char *name;
-	/* Function to create a member of the authmethods list */
-
-	auth_init_function init;
-};
-
 typedef struct auth_ntlmssp_state
 {
 	TALLOC_CTX *mem_ctx;
@@ -154,4 +150,26 @@ typedef struct auth_ntlmssp_state
 	struct ntlmssp_state *ntlmssp_state;
 } AUTH_NTLMSSP_STATE;
 
-#endif /* _SMBAUTH_H_ */
+#define auth_ops __XXX_ERROR_BLA
+struct auth_operations {
+	/* the name of the backend */
+	const char *name;
+
+	/* Function to create a member of the authmethods list */
+	NTSTATUS (*init)(struct auth_context *, const char *, struct auth_methods **);
+};
+
+/* this structure is used by backends to determine the size of some critical types */
+struct auth_critical_sizes {
+	int interface_version;
+	int sizeof_auth_operations;
+	int sizeof_auth_methods;
+	int sizeof_auth_context;
+	int sizeof_auth_ntlmssp_state;
+	int sizeof_auth_usersupplied_info;
+	int sizeof_auth_serversupplied_info;
+	int sizeof_auth_str;
+	int sizeof_auth_unistr;
+};
+
+#endif /* _SAMBA_AUTH_H */
diff --git a/source4/auth/auth_builtin.c b/source4/auth/auth_builtin.c
index 61270fca101..d82a1ab56b6 100644
--- a/source4/auth/auth_builtin.c
+++ b/source4/auth/auth_builtin.c
@@ -50,7 +50,7 @@ static NTSTATUS check_guest_security(const struct auth_context *auth_context,
 
 /* Guest modules initialisation */
 
-NTSTATUS auth_init_guest(struct auth_context *auth_context, const char *options, auth_methods **auth_method) 
+static NTSTATUS auth_init_guest(struct auth_context *auth_context, const char *options, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method))
 		return NT_STATUS_NO_MEMORY;
@@ -101,7 +101,7 @@ static NTSTATUS check_name_to_ntstatus_security(const struct auth_context *auth_
 
 /** Module initailisation function */
 
-NTSTATUS auth_init_name_to_ntstatus(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
+static NTSTATUS auth_init_name_to_ntstatus(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method))
 		return NT_STATUS_NO_MEMORY;
@@ -150,7 +150,7 @@ static DATA_BLOB auth_get_fixed_challenge(const struct auth_context *auth_contex
 
 /** Module initailisation function */
 
-NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
+static NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method))
 		return NT_STATUS_NO_MEMORY;
@@ -161,50 +161,38 @@ NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char
 	return NT_STATUS_OK;
 }
 
-/**
- * Outsorce an auth module to an external loadable .so
- *
- * Only works on systems with dlopen() etc.
- **/
-
-/* Plugin modules initialisation */
-
-NTSTATUS auth_init_plugin(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
+NTSTATUS auth_builtin_init(void)
 {
-	void * dl_handle;
-	char *plugin_param, *plugin_name, *p;
-	auth_init_function plugin_init;
-
-	if (param == NULL) {
-		DEBUG(0, ("auth_init_plugin: The plugin module needs an argument!\n"));
-		return NT_STATUS_UNSUCCESSFUL;
+	NTSTATUS ret;
+	struct auth_operations ops;
+
+	ops.name = "guest";
+	ops.init = auth_init_guest;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
 	}
 
-	plugin_name = smb_xstrdup(param);
-	p = strchr(plugin_name, ':');
-	if (p) {
-		*p = 0;
-		plugin_param = p+1;
-		trim_string(plugin_param, " ", " ");
-	} else plugin_param = NULL;
-
-	trim_string(plugin_name, " ", " ");
-
-	DEBUG(5, ("auth_init_plugin: Trying to load auth plugin %s\n", plugin_name));
-	dl_handle = sys_dlopen(plugin_name, RTLD_NOW );
-	if (!dl_handle) {
-		DEBUG(0, ("auth_init_plugin: Failed to load auth plugin %s using sys_dlopen (%s)\n",
-					plugin_name, sys_dlerror()));
-		return NT_STATUS_UNSUCCESSFUL;
-	}
-    
-	plugin_init = (auth_init_function)sys_dlsym(dl_handle, "auth_init");
-	if (!plugin_init){
-		DEBUG(0, ("Failed to find function 'auth_init' using sys_dlsym in sam plugin %s (%s)\n",
-					plugin_name, sys_dlerror()));	    
-		return NT_STATUS_UNSUCCESSFUL;
+#ifdef DEVELOPER
+	ops.name = "name_to_ntstatus";
+	ops.init = auth_init_name_to_ntstatus;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
 	}
 
-	DEBUG(5, ("Starting sam plugin %s with paramater %s\n", plugin_name, plugin_param?plugin_param:"(null)"));
-	return plugin_init(auth_context, plugin_param, auth_method);
+	ops.name = "fixed_challenge";
+	ops.init = auth_init_fixed_challenge;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
+	}
+#endif /* DEVELOPER */
+	return ret;
 }
diff --git a/source4/auth/auth_sam.c b/source4/auth/auth_sam.c
index 51462555f9b..f25a5e46917 100644
--- a/source4/auth/auth_sam.c
+++ b/source4/auth/auth_sam.c
@@ -468,7 +468,7 @@ static NTSTATUS check_sam_security(const struct auth_context *auth_context,
 }
 
 /* module initialisation */
-NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
+static NTSTATUS auth_init_sam(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method)) {
 		return NT_STATUS_NO_MEMORY;
@@ -509,7 +509,7 @@ static NTSTATUS check_samstrict_security(const struct auth_context *auth_context
 }
 
 /* module initialisation */
-NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
+static NTSTATUS auth_init_samstrict(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method)) {
 		return NT_STATUS_NO_MEMORY;
@@ -552,7 +552,7 @@ static NTSTATUS check_samstrict_dc_security(const struct auth_context *auth_cont
 }
 
 /* module initialisation */
-NTSTATUS auth_init_samstrict_dc(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
+static NTSTATUS auth_init_samstrict_dc(struct auth_context *auth_context, const char *param, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method)) {
 		return NT_STATUS_NO_MEMORY;
@@ -562,3 +562,38 @@ NTSTATUS auth_init_samstrict_dc(struct auth_context *auth_context, const char *p
 	(*auth_method)->name = "samstrict_dc";
 	return NT_STATUS_OK;
 }
+
+NTSTATUS auth_sam_init(void)
+{
+	NTSTATUS ret;
+	struct auth_operations ops;
+
+	ops.name = "sam";
+	ops.init = auth_init_sam;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	ops.name = "samstrict";
+	ops.init = auth_init_samstrict;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	ops.name = "samstrict_dc";
+	ops.init = auth_init_samstrict_dc;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	return ret;
+}
diff --git a/source4/auth/auth_unix.c b/source4/auth/auth_unix.c
index 4f44767a81a..b7c3475e55d 100644
--- a/source4/auth/auth_unix.c
+++ b/source4/auth/auth_unix.c
@@ -119,7 +119,7 @@ static NTSTATUS check_unix_security(const struct auth_context *auth_context,
 }
 
 /* module initialisation */
-NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, auth_methods **auth_method) 
+static NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, auth_methods **auth_method) 
 {
 	if (!make_auth_methods(auth_context, auth_method)) {
 		return NT_STATUS_NO_MEMORY;
@@ -130,3 +130,19 @@ NTSTATUS auth_init_unix(struct auth_context *auth_context, const char* param, au
 	return NT_STATUS_OK;
 }
 
+NTSTATUS auth_unix_init(void)
+{
+	NTSTATUS ret;
+	struct auth_operations ops;
+
+	ops.name = "unix";
+	ops.init = auth_init_unix;
+	ret = register_backend("auth", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' auth backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	return ret;
+}
diff --git a/source4/auth/config.m4 b/source4/auth/config.m4
new file mode 100644
index 00000000000..cb547301f5c
--- /dev/null
+++ b/source4/auth/config.m4
@@ -0,0 +1,9 @@
+dnl # AUTH Server subsystem
+
+SMB_MODULE(auth_sam,AUTH,STATIC,[auth/auth_sam.o])
+SMB_MODULE(auth_builtin,AUTH,STATIC,[auth/auth_builtin.o])
+SMB_MODULE(auth_unix,AUTH,STATIC,[auth/auth_unix.o])
+
+SMB_SUBSYSTEM(AUTH,auth/auth.o,
+		[auth/auth_ntlmssp.o auth/auth_util.o auth/pampass.o auth/pass_check.o auth/auth_compat.o],
+		auth/auth_public_proto.h)
diff --git a/source4/configure.in b/source4/configure.in
index bb6ec6bb032..f356d4a6558 100644
--- a/source4/configure.in
+++ b/source4/configure.in
@@ -1718,7 +1718,6 @@ AC_SUBST(SMBD_EXTRA_OBJS)
 AC_SUBST(SMBD_EXTRA_LIBS)
 
 sinclude(libads/config.m4)
-sinclude(passdb/config.m4)
 
 ###############################################
 # test for where we get crypt() from
@@ -1987,6 +1986,8 @@ fi ])
 sinclude(lib/iconv.m4)
 sinclude(smbd/process_model.m4)
 sinclude(smb_server/config.m4)
+sinclude(auth/config.m4)
+sinclude(passdb/config.m4)
 sinclude(ntvfs/config.m4)
 sinclude(rpc_server/config.m4)
 
diff --git a/source4/include/context.h b/source4/include/context.h
index 7b156ed3820..5c7d117050a 100644
--- a/source4/include/context.h
+++ b/source4/include/context.h
@@ -71,7 +71,7 @@ struct tcon_context {
 	BOOL admin_user;
 
 	/* the NTVFS operations - see source/ntvfs/ and include/ntvfs.h for details */
-	struct ntvfs_ops *ntvfs_ops;
+	const struct ntvfs_ops *ntvfs_ops;
 
 	/* the reported filesystem type */
 	char *fs_type;
@@ -359,7 +359,7 @@ struct server_context {
 	struct event_context *events;
 
 	/* process model specific operations */
-	struct model_ops *model_ops;
+	const struct model_ops *model_ops;
 };
 
 
diff --git a/source4/include/includes.h b/source4/include/includes.h
index 2391a59b67f..351f7e1ad83 100644
--- a/source4/include/includes.h
+++ b/source4/include/includes.h
@@ -742,8 +742,8 @@ extern int errno;
 
 #include "libcli/auth/ntlmssp.h"
 
-#include "auth.h"
-#include "passdb.h"
+#include "auth/auth.h"
+#include "passdb/passdb.h"
 
 #include "module.h"
 
diff --git a/source4/libads/config.m4 b/source4/libads/config.m4
index c0b926b851c..a7a882f0484 100644
--- a/source4/libads/config.m4
+++ b/source4/libads/config.m4
@@ -70,7 +70,6 @@ if test x"$with_ldap_support" != x"no"; then
   
   if test x"$ac_cv_lib_ext_ldap_ldap_init" = x"yes" -a x"$ac_cv_func_ext_ldap_domain2hostlist" = x"yes"; then
     AC_DEFINE(HAVE_LDAP,1,[Whether ldap is available])
-    SMB_MODULE_DEFAULT(STATIC,pdb_ldap)
     with_ldap_support=yes
     AC_MSG_CHECKING(whether LDAP support is used)
     AC_MSG_RESULT(yes)
diff --git a/source4/ntvfs/ntvfs_base.c b/source4/ntvfs/ntvfs_base.c
index 3e1f77edce4..7ed8c738b6c 100644
--- a/source4/ntvfs/ntvfs_base.c
+++ b/source4/ntvfs/ntvfs_base.c
@@ -30,7 +30,7 @@
  * can be more than one backend with the same name, as long as they
  * have different typesx */
 static struct {
-	struct ntvfs_ops *ops;
+	const struct ntvfs_ops *ops;
 } *backends = NULL;
 static int num_backends;
 
@@ -44,7 +44,8 @@ static int num_backends;
 */
 static NTSTATUS ntvfs_register(void *_ops)
 {
-	struct ntvfs_ops *ops = _ops;
+	const struct ntvfs_ops *ops = _ops;
+	struct ntvfs_ops *new_ops;
 	
 	if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
 		/* its already registered! */
@@ -58,8 +59,10 @@ static NTSTATUS ntvfs_register(void *_ops)
 		smb_panic("out of memory in ntvfs_register");
 	}
 
-	backends[num_backends].ops = smb_xmemdup(ops, sizeof(*ops));
-	backends[num_backends].ops->name = smb_xstrdup(ops->name);
+	new_ops = smb_xmemdup(ops, sizeof(*ops));
+	new_ops->name = smb_xstrdup(ops->name);
+
+	backends[num_backends].ops = new_ops;
 
 	num_backends++;
 
@@ -73,7 +76,7 @@ static NTSTATUS ntvfs_register(void *_ops)
 /*
   return the operations structure for a named backend of the specified type
 */
-struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
+const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
 {
 	int i;
 
diff --git a/source4/passdb/config.m4 b/source4/passdb/config.m4
index e69de29bb2d..328726481a8 100644
--- a/source4/passdb/config.m4
+++ b/source4/passdb/config.m4
@@ -0,0 +1,15 @@
+dnl # PASSDB Server subsystem
+
+SMB_MODULE(pdb_smbpasswd,PASSDB,STATIC,[passdb/pdb_smbpasswd.o])
+SMB_MODULE(pdb_tdb,PASSDB,NOT,[passdb/pdb_tdb.o])
+SMB_MODULE(pdb_guest,PASSDB,STATIC,[passdb/pdb_guest.o])
+SMB_MODULE(pdb_unix,PASSDB,STATIC,[passdb/pdb_unix.o])
+
+if test x"$with_ldap_support" = x"yes"; then
+	SMB_MODULE_DEFAULT(STATIC,pdb_ldap)
+fi
+SMB_MODULE(pdb_ldap,PASSDB,NOT,[passdb/pdb_ldap.o],[],[$LDAP_LIBS])
+
+SMB_SUBSYSTEM(PASSDB,passdb/pdb_interface.o,
+		[passdb/passdb.o passdb/machine_sid.o passdb/util_sam_sid.o passdb/pdb_get_set.o passdb/pdb_compat.o],
+		passdb/passdb_public_proto.h)
diff --git a/source4/include/passdb.h b/source4/passdb/passdb.h
index 25fe5d53005..7b7f2210653 100644
--- a/source4/include/passdb.h
+++ b/source4/passdb/passdb.h
@@ -19,22 +19,20 @@
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-#ifndef _PASSDB_H
-#define _PASSDB_H
-
-
-/*****************************************************************
- Functions to be implemented by the new (v2) passdb API 
-****************************************************************/
+#ifndef _SAMBA_PASSDB_H
+#define _SAMBA_PASSDB_H
 
 /*
  * This next constant specifies the version number of the PASSDB interface
- * this SAMBA will load. Increment this if *ANY* changes are made to the interface. 
+ * this SAMBA will load. Increment this with a comment if *ANY* changes are made
+ * to the interface and maybe update struct auth_critical_sizes
  */
-
+/* version 2 - init versioning of the interface - metze */
+/* version 3 - value states of SAM_ACCOUNT entries - metze */
+/* version 4 - add group mapping api - vlendec */
 #define PASSDB_INTERFACE_VERSION 4
 
-typedef struct pdb_context 
+typedef struct pdb_context
 {
 	struct pdb_methods *pdb_methods;
 	struct pdb_methods *pwent_methods;
@@ -101,15 +99,21 @@ typedef struct pdb_methods
 
 } PDB_METHODS;
 
-typedef NTSTATUS (*pdb_init_function)(struct pdb_context *, 
-			 struct pdb_methods **, 
-			 const char *);
-
-struct pdb_init_function_entry {
+struct passdb_ops {
+	/* the name of the backend */
 	const char *name;
+
 	/* Function to create a member of the pdb_methods list */
-	pdb_init_function init;
-	struct pdb_init_function_entry *prev, *next;
+	NTSTATUS (*init)(struct pdb_context *, struct pdb_methods **, const char *);
+};
+
+/* this structure is used by modules to determine the size of some critical types */
+struct passdb_critical_sizes {
+	int interface_version;
+	int sizeof_passdb_ops;
+	int sizeof_pdb_methods;
+	int sizeof_pdb_context;
+	int sizeof_SAM_ACCOUNT;
 };
 
-#endif /* _PASSDB_H */
+#endif /* _SAMBA_PASSDB_H */
diff --git a/source4/passdb/pdb_guest.c b/source4/passdb/pdb_guest.c
index 3f0f06d18d0..11da9755014 100644
--- a/source4/passdb/pdb_guest.c
+++ b/source4/passdb/pdb_guest.c
@@ -100,7 +100,7 @@ static NTSTATUS guestsam_getsampwsid(struct pdb_methods *my_methods, SAM_ACCOUNT
 	return guestsam_getsampwrid(my_methods, user, rid);
 }
 
-NTSTATUS pdb_init_guestsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_guestsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	
@@ -121,3 +121,39 @@ NTSTATUS pdb_init_guestsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, c
 	/* There's not very much to initialise here */
 	return NT_STATUS_OK;
 }
+
+NTSTATUS pdb_guest_init(void)
+{
+	NTSTATUS ret;
+	struct passdb_ops ops;
+
+	ZERO_STRUCT(ops);
+
+	/* fill in our name */
+	ops.name = "guestsam";
+	/* fill in all the operations */
+	ops.init = pdb_init_guestsam;
+
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	/* fill in our name */
+	ops.name = "guest";
+	/* fill in all the operations */
+	ops.init = pdb_init_guestsam;
+
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	return ret;
+}
diff --git a/source4/passdb/pdb_interface.c b/source4/passdb/pdb_interface.c
index 5b2c0812752..ecdd7b64868 100644
--- a/source4/passdb/pdb_interface.c
+++ b/source4/passdb/pdb_interface.c
@@ -24,78 +24,99 @@
 #undef DBGC_CLASS
 #define DBGC_CLASS DBGC_PASSDB
 
-/** List of various built-in passdb modules */
-static const struct {
-    const char *name;
-    /* Function to create a member of the pdb_methods list */
-    pdb_init_function init;
-} builtin_pdb_init_functions[] = {
-	{ "smbpasswd", pdb_init_smbpasswd },
-	{ "smbpasswd_nua", pdb_init_smbpasswd_nua },
-	{ "tdbsam", pdb_init_tdbsam },
-	{ "tdbsam_nua", pdb_init_tdbsam_nua },
-	{ "ldapsam", pdb_init_ldapsam },
-	{ "ldapsam_nua", pdb_init_ldapsam_nua },
-	{ "unixsam", pdb_init_unixsam },
-	{ "guest", pdb_init_guestsam },
-	{ "nisplussam", pdb_init_nisplussam },
-	{ NULL, NULL}
-};
-
-static struct pdb_init_function_entry *backends;
-static void lazy_initialize_passdb(void);
-
-static void lazy_initialize_passdb()
+/* the list of currently registered AUTH backends */
+static struct {
+	const struct passdb_ops *ops;
+} *backends = NULL;
+static int num_backends;
+
+/*
+  register a AUTH backend. 
+
+  The 'name' can be later used by other backends to find the operations
+  structure for this backend.
+*/
+static NTSTATUS passdb_register(void *_ops)
 {
-	int i;
-	static BOOL initialised = False;
+	const struct passdb_ops *ops = _ops;
+	struct passdb_ops *new_ops;
 	
-	if(!initialised) {
-		initialised = True;
+	if (passdb_backend_byname(ops->name) != NULL) {
+		/* its already registered! */
+		DEBUG(0,("PASSDB backend '%s' already registered\n", 
+			 ops->name));
+		return NT_STATUS_OBJECT_NAME_COLLISION;
+	}
 
-		for(i = 0; builtin_pdb_init_functions[i].name; i++) {
-			smb_register_passdb(builtin_pdb_init_functions[i].name, builtin_pdb_init_functions[i].init, PASSDB_INTERFACE_VERSION);
-		}
+	backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
+	if (!backends) {
+		smb_panic("out of memory in passdb_register");
 	}
-}
 
-BOOL smb_register_passdb(const char *name, pdb_init_function init, int version) 
-{
-	struct pdb_init_function_entry *entry = backends;
+	new_ops = smb_xmemdup(ops, sizeof(*ops));
+	new_ops->name = smb_xstrdup(ops->name);
 
-	if(version != PASSDB_INTERFACE_VERSION)
-		return False;
+	backends[num_backends].ops = new_ops;
+
+	num_backends++;
 
-	DEBUG(5,("Attempting to register passdb backend %s\n", name));
+	DEBUG(3,("PASSDB backend '%s' registered\n", 
+		 ops->name));
+
+	return NT_STATUS_OK;
+}
 
-	/* Check for duplicates */
-	while(entry) { 
-		if(strcasecmp(name, entry->name) == 0) { 
-			DEBUG(0,("There already is a passdb backend registered with the name %s!\n", name));
-			return False;
+/*
+  return the operations structure for a named backend of the specified type
+*/
+const struct passdb_ops *passdb_backend_byname(const char *name)
+{
+	int i;
+
+	for (i=0;i<num_backends;i++) {
+		if (strcmp(backends[i].ops->name, name) == 0) {
+			return backends[i].ops;
 		}
-		entry = entry->next;
 	}
 
-	entry = smb_xmalloc(sizeof(struct pdb_init_function_entry));
-	entry->name = name;
-	entry->init = init;
+	return NULL;
+}
 
-	DLIST_ADD(backends, entry);
-	DEBUG(5,("Successfully added passdb backend '%s'\n", name));
-	return True;
+/*
+  return the PASSDB interface version, and the size of some critical types
+  This can be used by backends to either detect compilation errors, or provide
+  multiple implementations for different smbd compilation options in one module
+*/
+const struct passdb_critical_sizes *passdb_interface_version(void)
+{
+	static const struct passdb_critical_sizes critical_sizes = {
+		PASSDB_INTERFACE_VERSION,
+		sizeof(struct passdb_ops),
+		sizeof(struct pdb_methods),
+		sizeof(struct pdb_context),
+		sizeof(SAM_ACCOUNT)
+	};
+
+	return &critical_sizes;
 }
 
-struct pdb_init_function_entry *pdb_find_backend_entry(const char *name)
+/*
+  initialise the PASSDB subsystem
+*/
+BOOL passdb_init(void)
 {
-	struct pdb_init_function_entry *entry = backends;
+	NTSTATUS status;
 
-	while(entry) {
-		if (strequal(entry->name, name)) return entry;
-		entry = entry->next;
+	status = register_subsystem("passdb", passdb_register); 
+	if (!NT_STATUS_IS_OK(status)) {
+		return False;
 	}
 
-	return NULL;
+	/* FIXME: Perhaps panic if a basic backend, such as SAM, fails to initialise? */
+	static_init_passdb;
+
+	DEBUG(3,("PASSDB subsystem version %d initialised\n", PASSDB_INTERFACE_VERSION));
+	return True;
 }
 
 static NTSTATUS context_setsampwent(struct pdb_context *context, BOOL update)
@@ -300,18 +321,16 @@ static void free_pdb_context(struct pdb_context **context)
 static NTSTATUS make_pdb_methods_name(struct pdb_methods **methods, struct pdb_context *context, const char *selected)
 {
 	char *module_name = smb_xstrdup(selected);
-	char *module_location = NULL, *p;
-	struct pdb_init_function_entry *entry;
+	char *module_param = NULL, *p;
+	const struct passdb_ops *ops;
 	NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 
-	lazy_initialize_passdb();
-
 	p = strchr(module_name, ':');
 
 	if (p) {
 		*p = 0;
-		module_location = p+1;
-		trim_string(module_location, " ", " ");
+		module_param = p+1;
+		trim_string(module_param, " ", " ");
 	}
 
 	trim_string(module_name, " ", " ");
@@ -319,20 +338,18 @@ static NTSTATUS make_pdb_methods_name(struct pdb_methods **methods, struct pdb_c
 
 	DEBUG(5,("Attempting to find an passdb backend to match %s (%s)\n", selected, module_name));
 
-	entry = pdb_find_backend_entry(module_name);
-	
+	ops = passdb_backend_byname(module_name);
 	/* No such backend found */
-	if(!entry) { 
+	if(!ops) { 
 		SAFE_FREE(module_name);
 		return NT_STATUS_INVALID_PARAMETER;
 	}
-	
-	DEBUG(5,("Found pdb backend %s\n", module_name));
-	nt_status = entry->init(context, methods, module_location);
+	DEBUG(5,("Found PASSDB backend %s\n", module_name));
+	nt_status = ops->init(context, methods, module_param);
 	if (NT_STATUS_IS_OK(nt_status)) {
-		DEBUG(5,("pdb backend %s has a valid init\n", selected));
+		DEBUG(5,("PASSDB backend %s has a valid init\n", selected));
 	} else {
-		DEBUG(0,("pdb backend %s did not correctly init (error was %s)\n", selected, nt_errstr(nt_status)));
+		DEBUG(0,("PASSDB backend %s did not correctly init (error was %s)\n", selected, nt_errstr(nt_status)));
 	}
 	SAFE_FREE(module_name);
 	return nt_status;
diff --git a/source4/passdb/pdb_ldap.c b/source4/passdb/pdb_ldap.c
index 6bab5b9bca2..5f7db7f5de5 100644
--- a/source4/passdb/pdb_ldap.c
+++ b/source4/passdb/pdb_ldap.c
@@ -28,7 +28,6 @@
 #undef DBGC_CLASS
 #define DBGC_CLASS DBGC_PASSDB
 
-#ifdef HAVE_LDAP
 /* TODO:
 *  persistent connections: if using NSS LDAP, many connections are made
 *      however, using only one within Samba would be nice
@@ -1979,7 +1978,7 @@ static void free_private_data(void **vp)
 	/* No need to free any further, as it is talloc()ed */
 }
 
-NTSTATUS pdb_init_ldapsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_ldapsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	struct ldapsam_privates *ldap_state;
@@ -2036,7 +2035,7 @@ NTSTATUS pdb_init_ldapsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, co
 	return NT_STATUS_OK;
 }
 
-NTSTATUS pdb_init_ldapsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_ldapsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	struct ldapsam_privates *ldap_state;
@@ -2064,20 +2063,36 @@ NTSTATUS pdb_init_ldapsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method
 	return NT_STATUS_OK;
 }
 
-
-#else
-
-NTSTATUS pdb_init_ldapsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+NTSTATUS pdb_ldap_init(void)
 {
-	DEBUG(0, ("ldap not detected at configure time, ldapsam not availalble!\n"));
-	return NT_STATUS_UNSUCCESSFUL;
-}
+	NTSTATUS ret;
+	struct passdb_ops ops;
+
+	/* fill in our name */
+	ops.name = "ldapsam";
+	/* fill in all the operations */
+	ops.init = pdb_init_ldapsam;
+
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
 
-NTSTATUS pdb_init_ldapsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
-{
-	DEBUG(0, ("ldap not dectected at configure time, ldapsam_nua not available!\n"));
-	return NT_STATUS_UNSUCCESSFUL;
-}
+	/* fill in our name */
+	ops.name = "ldapsam_nua";
+	/* fill in all the operations */
+	ops.init = pdb_init_ldapsam_nua;
 
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
 
-#endif
+	return ret;
+}
diff --git a/source4/passdb/pdb_smbpasswd.c b/source4/passdb/pdb_smbpasswd.c
index 6f8c8a6fcc4..0811c23484d 100644
--- a/source4/passdb/pdb_smbpasswd.c
+++ b/source4/passdb/pdb_smbpasswd.c
@@ -1508,7 +1508,7 @@ static void free_private_data(void **vp)
 }
 
 
-NTSTATUS pdb_init_smbpasswd(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_smbpasswd(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	struct smbpasswd_privates *privates;
@@ -1557,7 +1557,7 @@ NTSTATUS pdb_init_smbpasswd(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method,
 	return NT_STATUS_OK;
 }
 
-NTSTATUS pdb_init_smbpasswd_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_smbpasswd_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	struct smbpasswd_privates *privates;
@@ -1579,3 +1579,37 @@ NTSTATUS pdb_init_smbpasswd_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_meth
 
 	return NT_STATUS_OK;
 }
+
+NTSTATUS pdb_smbpasswd_init(void)
+{
+	NTSTATUS ret;
+	struct passdb_ops ops;
+
+	/* fill in our name */
+	ops.name = "smbpasswd";
+	/* fill in all the operations */
+	ops.init = pdb_init_smbpasswd;
+
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	/* fill in our name */
+	ops.name = "smbpasswd_nua";
+	/* fill in all the operations */
+	ops.init = pdb_init_smbpasswd_nua;
+
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	return ret;
+}
diff --git a/source4/passdb/pdb_tdb.c b/source4/passdb/pdb_tdb.c
index c48c9567b16..a3fda1f47e6 100644
--- a/source4/passdb/pdb_tdb.c
+++ b/source4/passdb/pdb_tdb.c
@@ -37,8 +37,6 @@ static int tdbsam_debug_level = DBGC_ALL;
 
 #endif
 
-#ifdef WITH_TDB_SAM
-
 #define PDB_VERSION		"20010830"
 #define PASSDB_FILE_NAME	"passdb.tdb"
 #define TDB_FORMAT_STRING	"ddddddBBBBBBBBBBBBddBBwdwdBdd"
@@ -906,7 +904,7 @@ static void free_private_data(void **vp)
 }
 
 
-NTSTATUS pdb_init_tdbsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_tdbsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	struct tdbsam_privates *tdb_state;
@@ -960,7 +958,7 @@ NTSTATUS pdb_init_tdbsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, con
 	return NT_STATUS_OK;
 }
 
-NTSTATUS pdb_init_tdbsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_tdbsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	struct tdbsam_privates *tdb_state;
@@ -988,20 +986,36 @@ NTSTATUS pdb_init_tdbsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method,
 	return NT_STATUS_OK;
 }
 
+NTSTATUS pdb_tdb_init(void)
+{
+	NTSTATUS ret;
+	struct passdb_ops ops;
 
-#else
+	/* fill in our name */
+	ops.name = "tdbsam";
+	/* fill in all the operations */
+	ops.init = pdb_init_tdbsam;
 
-NTSTATUS pdb_init_tdbsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
-{
-	DEBUG(0, ("tdbsam not compiled in!\n"));
-	return NT_STATUS_UNSUCCESSFUL;
-}
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
 
-NTSTATUS pdb_init_tdbsam_nua(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
-{
-	DEBUG(0, ("tdbsam_nua not compiled in!\n"));
-	return NT_STATUS_UNSUCCESSFUL;
-}
+	/* fill in our name */
+	ops.name = "tdbsam_nua";
+	/* fill in all the operations */
+	ops.init = pdb_init_tdbsam_nua;
 
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
 
-#endif
+	return ret;
+}
diff --git a/source4/passdb/pdb_unix.c b/source4/passdb/pdb_unix.c
index b42843d8020..a1552981f1b 100644
--- a/source4/passdb/pdb_unix.c
+++ b/source4/passdb/pdb_unix.c
@@ -88,7 +88,7 @@ static NTSTATUS unixsam_getsampwsid(struct pdb_methods *my_methods, SAM_ACCOUNT
 	return unixsam_getsampwrid(my_methods, user, rid);
 }
 
-NTSTATUS pdb_init_unixsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
+static NTSTATUS pdb_init_unixsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, const char *location)
 {
 	NTSTATUS nt_status;
 	
@@ -108,3 +108,24 @@ NTSTATUS pdb_init_unixsam(PDB_CONTEXT *pdb_context, PDB_METHODS **pdb_method, co
 	/* There's not very much to initialise here */
 	return NT_STATUS_OK;
 }
+
+NTSTATUS pdb_unix_init(void)
+{
+	NTSTATUS ret;
+	struct passdb_ops ops;
+
+	/* fill in our name */
+	ops.name = "unixsam";
+	/* fill in all the operations */
+	ops.init = pdb_init_unixsam;
+
+	/* register ourselves with the PASSDB subsystem. */
+	ret = register_backend("passdb", &ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' PASSDB backend!\n",
+			ops.name));
+		return ret;
+	}
+
+	return ret;
+}
diff --git a/source4/smbd/process.c b/source4/smbd/process.c
index 38f76417f69..592a0efc990 100644
--- a/source4/smbd/process.c
+++ b/source4/smbd/process.c
@@ -44,9 +44,6 @@ void smbd_process_init(void)
 	if (!init_registry())
 		exit(1);
 
-	if(!initialize_password_db(False))
-		exit(1);
-
 	/* possibly reload the services file. */
 	reload_services(NULL, True);
 
@@ -73,6 +70,16 @@ void smbd_process_init(void)
 	if (!init_change_notify())
 		exit(1);
 
+	/* Setup the AUTH subsystem */
+	if (!auth_init())
+		exit(1);
+
+	/* Setup the PASSDB subsystem */
+	if (!passdb_init())
+		exit(1);
+	if(!initialize_password_db(False))
+		exit(1);
+
 	/* Setup the NTVFS subsystem */
 	if (!ntvfs_init())
 		exit(1);